Chemicals and DrugsAnalytical, Diagnostic and Therapeutic Techniques and Equipment
Crown EthersRotaxanesCrownsAntimutagenic AgentsEthers, CyclicEtherEthers
Crown Ethers
Macrocyclic polyethers with the repeating unit of (-CH2-CH2-O)n where n is greater than 2 and some oxygens may be replaced by nitrogen, sulfur or phosphorus. These compounds are useful for coordinating CATIONS. The nomenclature uses a prefix to indicate the size of the ring and a suffix for the number of heteroatoms.
Rotaxanes
Complex compounds in which a dumbbell shaped molecule is encircled by a macrocycle. They are named after rota (wheel) and axis (axle). Notation with a prefix is used to indicate the number of interlocked components. They have potential use in NANOTECHNOLOGY. Rotaxanes have been made with CYCLODEXTRINS and CYCLIC ETHERS.
Crowns
A prosthetic restoration that reproduces the entire surface anatomy of the visible natural crown of a tooth. It may be partial (covering three or more surfaces of a tooth) or complete (covering all surfaces). It is made of gold or other metal, porcelain, or resin.
Antimutagenic Agents
Agents that reduce the frequency or rate of spontaneous or induced mutations independently of the mechanism involved.
Ethers, Cyclic
Compounds of the general formula R-O-R arranged in a ring or crown formation.
Ether
A mobile, very volatile, highly flammable liquid used as an inhalation anesthetic and as a solvent for waxes, fats, oils, perfumes, alkaloids, and gums. It is mildly irritating to skin and mucous membranes.
Ethers

Lead-selective membrane potentiometric sensor based on an 18-membered thiacrown derivative. (1/64)

A PVC-based membrane electrode for lead ions based on hexathia-18-crown-6-tetraone as membrane carrier was prepared. The influence of membrane composition, pH of test solution and foreign ions on the electrode performance were investigated. The electrode showed a Nernstian response over a lead concentration range from 1.0 x 10(-6) to 8.0 x 10(-3) M at 25 degrees C, and was found to be very selective, precise and usable within the pH range 3.0-6.0. The electrode was successfully used as an indicator electrode in potentiometric titration of lead ions and in direct determination of lead in water samples.  (+info)

Selective transport of silver ion through a supported liquid membrane using hexathia-18-crown-6 as carrier. (2/64)

A facile supported liquid membrane (SLM) system for the selective and efficient transport of silver ion is introduced. The SLM used is a thin porous polyvinyldifluoride membrane impregnated with hexathia-18-crown-6 (HT18C6) dissolved in nitrophenyloctyl ether. HT18C6 acts as a specific carrier for the uphill transport of Ag+ ion as its picrate ion paired complex through the SLM. In the presence of thiosulfate ion as a suitable stripping agent in the strip solution, transport of silver occurs almost quantitatively after 4 h. The selectivity and efficiency of silver transport from aqueous solutions containing other Mn+ cations such as Mg2+, Ca2+, Co2+, Ni2+, Cu2+, Zn2+, Pb2+, Cd2+, Hg2+, Fe3+ and Cr3+ ions were investigated.  (+info)

Role of hypoxia during normal retinal vessel development and in experimental retinopathy of prematurity. (3/64)

PURPOSE: To test the hypothesis that retinal hypoxia is present during vascular development in normal rat pups and in a newborn rat model of retinopathy of prematurity (ROP). METHODS: Preretinal vitreous PO(2) measurements were made during room air breathing using (19)F magnetic resonance spectroscopy (MRS) and a perfluoro-15-crown-5-ether droplet in normal adult and newborn (postnatal day [P]1-P20) rats, and in newborn rats exposed first to 14 days of variable oxygen (before NV) and six additional days in room air after variable oxygen exposure (during NV). After each experiment, blood gas values were measured, and retinas were isolated. Retinas were adenosine diphosphatase (ADPase) stained, and flatmounted to determine peripheral avascular extent and NV incidence and severity. RESULTS: In the vascularized rat retina, no significant difference (P > 0.05) was found between the droplet-derived preretinal vitreous oxygen tension (24 +/- 2 mm Hg, mean +/- SEM, n = 18) and previously reported electrode-measured oxygen tension (22 +/- 1 mm Hg). Only during normal retinal vessel growth (P1-P10) and before the appearance of NV was evidence for retinal hypoxia found at the border of the vascular and avascular retina. However, the mean PO(2) (range, 24-28 mm Hg) over the vascular retina was not different (P > 0.05) between any of the newborn rat groups in this study. CONCLUSIONS: (19)F MRS of a perfluorocarbon droplet provides an accurate measure of preretinal vitreous oxygen tension in rats. These data support an important role of physiologic hypoxia in normal retinal circulatory development and raises the possibility that, in experimental ROP, retinal hypoxia is a necessary but not sufficient condition for the development of retinal NV.  (+info)

Selective molecular recognition of arginine by anionic salt bridge formation with bis-phosphate crown ethers: implications for gas phase peptide acidity from adduct dissociation. (4/64)

Arginine forms a stable noncovalent anionic salt bridge complex with DP (a crown ether which contains two endocyclic dialkylhydrogenphosphate esters). Abundant adduct formation with DP is observed for complexes with arginine, YAKR, HPPGFSPFR, AAKRKAA, RR, RPPGFSPFR, RYLGYL, RGDS, and YGGFMRGL in electrospray ionization mass spectrometry (ESI-MS) experiments. DFT calculations predict a hydrogen bonded salt bridge structure with a protonated guanidinium flanked by two deprotonated phosphates to be the lowest energy structure. Dissociation of DP/peptide adducts reveals that, in general, the relative gas phase acidity of a peptide is dependent on peptide length, with longer peptides being more acidic. In particular, peptides that are six residues or more in length can stabilize the deprotonated C-terminus by extensive hydrogen bonding with the peptide backbone. Dissociation of DP/peptide complexes often yields the deprotonated peptide, allowing for the facile formation of anionic peptides that otherwise would be difficult to generate in high abundance. Although DP has a preference for binding to arginine residues in peptides, DP is also observed to form less abundant complexes with peptides containing multiple lysines. Lys-Xxx-Lys and Lys-Lys sequences form low abundance anionic adducts with DP. For example, KKKK exclusively forms a double adduct with one net negative charge on the complex.  (+info)

Potentiometric determination of dopamine in pharmaceutical preparations by crown ether-PVC membrane sensors. (5/64)

Two simple, rapid and sensitive sensors for the assay of dopamine hydrochloride have been developed. The methods are based upon the formation of the membrane sensors 12-crown-4-phosphotungestic acid (crown ether-PTA)-dopamine and 12-crown-4-tetraphenylborate (crown ether-TPB)-dopamine as neutral carriers. The sensors were stable and showed fast potential responses of 10 s, and near-Nernstian cationic slopes of 53.3 - 56.2 mV/decade of activity between pH 2.2 - 6 for the monovalent dopamine cation over a wide range concentrations 1 x 10(-5) - 1 x 10(-1) M. The selectivity coefficients of the developed sensors indicated excellent selectivity for dopamine over a large number of organic and inorganic species and pharmaceutical excipients. The mediator o-nitrophenyloctyl ether significantly affected the lifetime of the fabricated sensors of dopamine. Satisfactory results were obtained for the determination of dopamine in dosage form by the proposed sensors with an average recovery of 99.85% for the nominal concentration.  (+info)

Field-dependent effect of crown ether (18-crown-6) on ionic conductance of alpha-hemolysin channels. (6/64)

Closing linear poly(ethylene glycol) (PEG) into a circular "crown" dramatically changes its dynamics in the alpha-hemolysin channel. In the electrically neutral crown ether (C2H4O)6, six ethylene oxide monomers are linked into a circle that gives the molecule ion-complexing capacity and increases its rigidity. As with linear PEG, addition of the crown to the membrane-bathing solution decreases the ionic conductance of the channel and generates additional conductance noise. However, in contrast to linear PEG, both the conductance reduction (reporting on crown partitioning into the channel pore) and the noise (reporting on crown dynamics in the pore) now depend on voltage strongly and nonmonotonically. Within the whole frequency range accessible in channel reconstitution experiments, the noise power spectrum is "white", showing that crown exchange between the channel and the bulk solution is fast. Analyzing these data in the framework of a Markovian two-state model, we are able to characterize the process quantitatively. We show that the lifetime of the crown in the channel reaches its maximum (a few microseconds) at about the same voltage (approximately 100 mV, negative from the side of protein addition) where the crown's reduction of the channel conductance is most pronounced. Our interpretation is that, because of its rigidity, the crown feels an effective steric barrier in the narrowest part of the channel pore. This barrier together with crown-ion complexing and resultant interaction with the applied field leads to behavior usually associated with voltage-dependent binding in the channel pore.  (+info)

Microcalorimetric study on host-guest complexation of naphtho-15-crown-5 with four ions of alkaline earth metal. (7/64)

Thermodynamic parameters of complexation of naphto-15-crown-5 with four alkaline earth ions in aqueous media was determined using titration microcalorimetry at 298.15 K. The stability of the complexes, thermal effect and entropy effect of the complexation is discussed on the basis of the guest ions structure and the solvent effect. The stability constants tendency to vary with ion radius was interpreted. Complex of naphtha-15-crown-5 with calcium ion is very stable due to the synergism of static electric interaction and size selectivity between the host and the guest.  (+info)

A novel ternary ligand system useful for preparation of cationic (99m)Tc-diazenido complexes and (99m)Tc-labeling of small biomolecules. (8/64)

This report describes a novel ternary ligand system composed of a phenylhydrazine, a crown ether-containing dithiocarbamate (DTC), and a PNP-type bisphosphine (PNP). The combination of three different ligands with (99m)Tc results in cationic (99m)Tc-diazenido complexes, [(99m)Tc(NNAr)(DTC)(PNP)]+, with potential radiopharmaceuticals for heart imaging. Synthesis of cationic (99m)Tc-diazenido complexes can be accomplished in two steps. For example, the reaction of phenylhydrazine with (99m)TcO4- at 100 degrees C in the presence of excess stannous chloride and 1,2-diaminopropane-N,N,N',N'-tetraacetic acid (PDTA) results in the [(99m)Tc(NNPh)(PDTA)n] intermediate, which then reacts with sodium N-(dithiocarbamato)-2-aminomethyl-15-Crown-5 (L4) and N,N-bis[2-(bis(3-ethoxypropyl)phosphino)ethyl]ethoxyethylamine (PNP6) at 100 degrees C for 15 min to give the complex, [(99m)Tc(NNPh)(L4)(PNP6)]+ in high yield (>90%). Cationic complexes [(99m)Tc(NNPh)(DTC)(PNP)]+ are stable for > or = 6 h. Their composition was determined to be 1:1:1:1 for Tc:NNPh:DTC:PNP using the mixed-ligand experiments on the tracer ((99m)Tc) level and was further confirmed by the ESI-MS spectral data of a model compound [Re(NNPh)(L4)(L6)]+. It was found that both DTCs and bisphosphines have a significant impact on the lipophilicity of their cationic (99m)Tc-diazenido complexes. Results from a (99m)Tc-labeling efficiency experiment showed that 4-hydrazinobenzoic acid (HYBA) might be useful as a bifunctional coupling agent for (99m)Tc-labeling of small biomolecules. However, the (99m)Tc-labeling efficiency of HYBA is much lower than that of 6-hydrazinonicotinic acid (HYNIC) with tricine and trisodium triphenylphosphine-3,3',3''-trisulfonate (TPPTS) as coligands.  (+info)

Crown ether - New World EncyclopediaCrown ether - New World Encyclopedia
Crown ethers are heterocyclic chemical compounds that consist of a ring containing several ether groups. The most common crown ethers are oligomers of ethylene oxide, the repeating unit being ethyleneoxy (-CH2CH2O-). Important members of this series are the tetramer (n = 4, or four ethyleneoxy units), the pentamer (n = 5), and the hexamer (n = 6). The term crown refers to the resemblance between the structure of a crown ether bound to a cation, and a crown sitting on a head. The first number in the name of a crown ether refers to the number of atoms in the cycle, and the second number refers to the number of those atoms that are oxygen. Crown ethers are much broader than the oligomers of ethylene oxide; an important group is derived from catechol.. Crown ethers strongly bind certain cations, forming complexes. The oxygen atoms are well situated to coordinate with a cation located within the ring, whereas the exterior of the ring is hydrophobic (repels water and polar and ionic substances). The ...
http://www.newworldencyclopedia.org/entry/Crown_ether
Effects of Crown Ethers and Anions on Redox Behaviors of Europium(III/II) in Aqueous Solution<...
TY - JOUR. T1 - Effects of Crown Ethers and Anions on Redox Behaviors of Europium(III/II) in Aqueous Solution. AU - Okaue, Yoshihiro. AU - Tomita, Masako. AU - Ichiyasu, Taketoshi. AU - Isobe, Toshiyuki. AU - Matsuda, Yoshihisa. PY - 1993/1/1. Y1 - 1993/1/1. N2 - The effects of crown ethers (12-crown-4, 15-erown-5, and lS-crown-6) and anions (C1O4~, NO3″, CI″, Br″, and I″) on the redox behaviors of europium(III/II) were investigated by cyclic voltammetry in an aqueous solution. The complexations of europium (II) with crown ethers were discussed by means of the shifts of redox potential. Addition of 18-crown-6 led to the appearance of a new oxidation wave at -0.28 V and the decrease of the peak height of the oxidation wave at -0.55 V. For 15-crown-5 and 12-crown-4, similar behaviors were observed, but the magnitude of the changes for oxidation peak heights was very small. These differences depend upon the relative sizes of europium(1) ion to the internal cavities of crown ethers. As ...
https://kyushu-u.pure.elsevier.com/en/publications/effects-of-crown-ethers-and-anions-on-redox-behaviors-of-europium
Crown Ethers Manufacturers, Suppliers & Exporters in IndiaCrown Ethers Manufacturers, Suppliers & Exporters in India
Search Indian Crown Ethers Manufacturers and Suppliers Details - Contact to Crown Ethers Exporters in India, Crown Ethers Wholesalers, Crown Ethers Distributors and Traders from India.
http://www.indianyellowpages.com/india/manufacturers/c/crown-ethers.htm
Preparation and ESR studies of salts of crown ether complex cations and nitridotechnetium(VI) anions: structures of the twinned...Preparation and ESR studies of salts of crown ether complex cations and nitridotechnetium(VI) anions: structures of the twinned...
We report the preparations and electron spin resonance (ESR) studies of a series of Cs+ and Rb+ crown ether (15-crown-5 and 18-crown-6) salts of [TcNCl4]- and [MoOCl4]-, and a new refinement of the X-ray structure of [Cs(18-crown-6)] [TcNCl4] involving a twinned P4/n scattering model. This refinement addresses some unsatisfactory aspects of the original disordered model. The structure consists of an infinite sandwich Cs+ cation/crown ether configuration and polymeric [TcNCL4]- anions, with Tc≡N distances of 1.561(36) Å, and anti-parallel chains of ---Tc≡N---Tc≡N ---with Tc···Tc separations of 4.275(4) Å. The structure determination of [Rb(15-crown-5)2][TcNCl4(OH2)] is also described and shows a lattice containing 2:1 sandwich-type crown ether/alkali-metal cations and isolated anions in the disordered lattice. The presence of Tc≡N infrared stretching frequencies at ca. 1074 cm-1 indicates the absence of strong electron donors coordinated to Tc in the sixth position (i. e. ...
http://rspa.royalsocietypublishing.org/content/442/1915/437
Crowning proteins: Modulating the protein surface properties using crown ethers<...
TY - JOUR. T1 - Crowning proteins. T2 - Modulating the protein surface properties using crown ethers. AU - Lee, Cheng Chung. AU - Maestre-Reyna, Manuel. AU - Hsu, Kai Cheng. AU - Wang, Hao Ching. AU - Liu, Chia I.. AU - Jeng, Wen Yih. AU - Lin, Li Ling. AU - Wood, Richard. AU - Chou, Chia Cheng. AU - Yang, Jinn Moon. AU - Wang, Andrew H J. PY - 2014/11/24. Y1 - 2014/11/24. N2 - Crown ethers are small, cyclic polyethers that have found wide-spread use in phase-transfer catalysis and, to a certain degree, in protein chemistry. Crown ethers readily bind metallic and organic cations, including positively charged amino acid side chains. We elucidated the crystal structures of several protein-crown ether co-crystals grown in the presence of 18-crown-6. We then employed biophysical methods and molecular dynamics simulations to compare these complexes with the corresponding apoproteins and with similar complexes with ring-shaped low-molecular-weight polyethylene glycols. Our studies show that crown ...
https://tmu.pure.elsevier.com/zh/publications/crowning-proteins-modulating-the-protein-surface-properties-using
New crown ethers containing Kemps triacid and their binding properties with alkali metal cations<...New crown ethers containing Kemps triacid and their binding properties with alkali metal cations<...
TY - JOUR. T1 - New crown ethers containing Kemps triacid and their binding properties with alkali metal cations. AU - Jeong, Kyu Sung. AU - Kim, Jong Hyun. N1 - Copyright: Copyright 2005 Elsevier Science B.V., Amsterdam. All rights reserved.. PY - 1996. Y1 - 1996. UR - http://www.scopus.com/inward/record.url?scp=18444365304&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=18444365304&partnerID=8YFLogxK. M3 - Article. AN - SCOPUS:18444365304. VL - 17. SP - 564. EP - 567. JO - Bulletin of the Korean Chemical Society. JF - Bulletin of the Korean Chemical Society. SN - 0253-2964. IS - 6. ER - ...
https://yonsei.pure.elsevier.com/en/publications/new-crown-ethers-containing-kemps-triacid-and-their-binding-prope-2
Construction of supramolecular organogels and hydrogels from crown ether based unsymmetric bolaamphiphiles - Chemical...Construction of supramolecular organogels and hydrogels from crown ether based unsymmetric bolaamphiphiles - Chemical...
A bolaamphiphilic low-molecular-weight gelator based on crown ether, which could self-assemble into organogels and hydrogels, was prepared. The contribution of each part of the structure to the gelation property was investigated by designing a series of analogues. A simple framework (crown ether-hydrophobic
http://pubs.rsc.org/en/Content/ArticleLanding/2014/CC/C4CC06048B?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+rss%2FCC+%28RSC+-+Chem.+Commun.+latest+articles%29
Centre de biophysique moléculaire - UPR 4301 - Macrocyclic Gd(3+) Complexes with Pendant Crown Ethers Designed for Binding...Centre de biophysique moléculaire - UPR 4301 - Macrocyclic Gd(3+) Complexes with Pendant Crown Ethers Designed for Binding...
Abstract : A series of Gd(3+) complexes exhibiting a relaxometric response to zwitterionic amino acid neurotransmitters was synthesized. The design concept involves ditopic interactions 1) between a positively charged and coordinatively unsaturated Gd(3+) chelate and the carboxylate group of the neurotransmitters and 2) between an azacrown ether appended to the chelate and the amino group of the neurotransmitters. The chelates differ in the nature and length of the linker connecting the cyclen-type macrocycle that binds the Ln(3+) ion and the crown ether. The complexes are monohydrated, but they exhibit high proton relaxivities (up to 7.7 mM(-1) s(-1) at 60 MHz, 310 K) due to slow molecular tumbling. The formation of ternary complexes with neurotransmitters was monitored by (1) H relaxometric titrations of the Gd(3+) complexes and by luminescence measurements on the Eu(3+) and Tb(3+) analogues at pH 7.4. The remarkable relaxivity decrease (≈80 %) observed on neurotransmitter binding is related ...
http://cbm.cnrs-orleans.fr/spip.php?article6881
Crystals | Free Full-Text | (B15c5)BiI3(I2): Molecular Benzo-15-Crown-5―BiI3 Complexes Bridged by Iodine Molecules to Chains |...Crystals | Free Full-Text | (B15c5)BiI3(I2): Molecular Benzo-15-Crown-5―BiI3 Complexes Bridged by Iodine Molecules to Chains |...
The reaction of bismuth triiodide with iodine and benzo-15-crown-5 in ethanol/dichloromethane yielded red single crystals of (b15c5)BiI3(I2) (monoclinic, P21/c (no. 14), a = 1376.9(1), b = 1172.7(1), c = 1700.2(2) pm, b = 115.197(6), V = 2484.1(4)·106 pm3, Z = 4). Neutral pseudo-octahedral complexes (b15c5)BiI3 are connected by secondary bonding interactions via iodine molecules to chains. Electronic structure calculations of the neutral complex (b15c5)BiI3 reveal that the compound can indeed be described as b15c5 interacting with a molecular BiI3 unit. However, bonding has to be mainly electrostatic as the interactions of the bismuth 6s lone pair with the 2p orbitals of the oxygen atoms of the crown ether are clearly antibonding.
http://www.mdpi.com/2073-4352/1/4/220/notes
75507-25-4|2-Hydroxymethyl-15-crown-5 ChemVia Mall, Custom Chemical Mall75507-25-4|2-Hydroxymethyl-15-crown-5 ChemVia Mall, Custom Chemical Mall
Visit ChemVia,you find CAS NO.75507-25-4,2-Hydroxymethyl-15-crown-5 specification and current price;you can buy 75507-25-4,2-Hydroxymethyl-15-crown-5 reagent online,and you can buy 2-Hydroxymethyl-15-crown-5 on bulk underline.
http://www.chemvia.com/en/?product-SR04020049-index.html
UV AND IR SPECTROSCOPIC STUDIES OF COLD ALKALI METAL ION-BENZO CROWN ETHER COMPLEXES IN THE GAS PHASEUV AND IR SPECTROSCOPIC STUDIES OF COLD ALKALI METAL ION-BENZO CROWN ETHER COMPLEXES IN THE GAS PHASE
We measured UV photodissociation and IR-UV double-resonance spectra of benzo-crown ether complexes with alkali metal ions (Li$^{+}$, Na$^{+}$, K$^{+}$, Rb$^{+}$, and Cs$^{+}$) in a cold, 22-pole ion trap nderline{\textbf{133}}(31), 12256 July 2011.}. All the complexes show a number of vibronically resolved UV bands in the 36000-38000 cm$^{-1}$ region. We used the IR-UV spectra in the CH stretching region to distinguish peaks in the UV spectra that belong to different conformers. The use of density functional theory allows us to determine the conformation of the complexes ...
https://kb.osu.edu/handle/1811/52468
Cation selectivity of natural and synthetic ionophores probed with laser-induced liquid beam mass spectrometry - Institutional...Cation selectivity of natural and synthetic ionophores probed with laser-induced liquid beam mass spectrometry - Institutional...
The novel laser desorption method laser-induced liquid beam ionization/desorption (LILBID) is applied to the mass spectrometric examination of selective ion binding by natural and synthetic ionophores in methanol solutions. The ions are desorbed from a liquid jet with an IR laser pulse and then extracted perpendicularly into a reflectron time-of-flight (RE-TOF) analyzer. LILBID studies on the natural ion carriers valinomycin and monensin A are presented, as well as those on the synthetic crown ethers 18-crown-6, diaza-18-crown-6, and benzo-15-crown-5. No fragment ions are detected, and the measured ion selectivity is in good qualitative agreement with published stability constants of the complexes. The observed specific recognition of silver ions by diaza-18-crown-6 can be rationalized by the principle of hard and soft acids and bases, which predicts stable complexes when the polarizabilities of Lewis acid and base are similar. Weak, noncovalent interactions like those in the sandwich complex ...
https://repository.uantwerpen.be/link/irua/89839
Icotinib Hydrochloride|EGFR inhibitor,potent and specific|CAS# 1204313-51-8Icotinib Hydrochloride|EGFR inhibitor,potent and specific|CAS# 1204313-51-8
|p|Icotinib Hydrochloride is a potent and highly selective inhibitor of epidermal growth factor receptor tyrosine kinases (EGFR-TKI) with IC50 value of 5 nM.|br /|EGFR is an oncogenic driver which is expressed on the cell surface of normal cells and cance
http://www.apexbt.com/icotinib-hydrochloride.html
Refubium - Aufbau und Untersuchung multivalenter metallosupramolekularer WirtsystemeRefubium - Aufbau und Untersuchung multivalenter metallosupramolekularer Wirtsysteme
The present thesis describes the construction of differently shaped di- to hexavalent crown ethers by coordination-driven self-assembly and their investigations according (pseudo¬-) rotaxane formation and kinetics of the dynamic ligand exchange. First, bipyridine and terpyridine ligand moieties as well as crown ether host moieties were synthesized. Then a toolbox of crown ether-substituted bi- and terpyridines was created by connecting the host and ligand moieties by Sonogashira reaction. In order to obtain predefined structures in the desired assemblies the ligands were designed applying the directional bonding approach. The prepared ligands were connected by coordination-driven self-assembly with several 3d transition metal (Fe(II), Co(II), Ni(II)) and ruthenium(II) ions providing the corresponding di- to hexavalent crown ether-substituted complexes. Whereas complex formation with ruthenium(II) ions provides kinetically inert complexes with moderate yields, coordination of the ligands to 3d ...
https://refubium.fu-berlin.de/handle/fub188/2271
The structure of host-guest complexes between dibenzo-18-crown-6 and water, ammonia, methanol, and acetylene : Evidence of...
Complexes of dibenzo-18-crown-6 (DB18C6, host) with water, ammonia, methanol, and acetylene (guest), formed in supersonic jets, have been characterized by using various spectroscopic methods: laser induced fluorescence (LIF), UV-UV hole-buning (UV-UV HB), and IR-UV double resonance (IR-UV DR) spectroscopy. Firstly, we reinvestigated the conformations of bare DB18C6 (species m1 and m2) and the structure of DB18C6-H2O (species a) [R. Kusaka, Y. Inokuchi, T. Ebata, Phys. Chem. Chem. Phys., 2008, 10, 6238] by measuring the IR-UV DR spectra in the region of the methylene CH stretching vibrations. From the IR-UV DR spectra, it was found that the IR spectral feature of the methylene CH stretch of DB18C6-H2O is clearly different from those of bare DB18C6 conformers, suggesting that DB18C6 changes its conformation when it forms the complex with a water molecule. With the aid of Monte Carlo simulation for extensive conformational search and density functional calculations (at B3LYP and M05-2X/6-31+G* ...
http://ir.lib.hiroshima-u.ac.jp/en/list/HU_creator/H/2c24955038ffd449520e17560c007669/item/37647
Explorations with Polycarbocyclic Cage Compounds - Digital Library
A variety of novel cage-functionalized pyridyl containing crown ethers have been prepared for use in selective alkali metal complexation studies. A highly preorganized, cage-functionalized cryptand also has been designed and has been synthesized for use as a selective Li+ complexant. The alkali metal picrate extraction profiles of these cage-functionalized crown ethers also have been studied. Novel cage-functionalized diazacrown ethers have been prepared for selective alkali metal complexation studies. Alkali metal picrate extraction experiments have been performed by using this new class of synthetic ionophores to investigate the effects of cage-annulation and the influence of N-pivot lariat sidearms upon their resulting complexation properties. Novel pyridyl containing calix[4]arene receptors were prepared. Analysis of their respective 1H NMR and 13C NMR spectra suggests that calix[4]arene moieties in the ligand occupy the cone conformation. The complexation properties of these host molecules were
https://digital.library.unt.edu/ark:/67531/metadc2218/
Electrochemiluminescent Detection of Metal Cations Using a Ruthenium(II) Bipyridyl Complex Containing a Crown Ether MoietyElectrochemiluminescent Detection of Metal Cations Using a Ruthenium(II) Bipyridyl Complex Containing a Crown Ether Moiety
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https://www.infona.pl/resource/bwmeta1.element.acs-doi-10_1021_ac010872z
Self-Assembling Leaflets | ScienceSelf-Assembling Leaflets | Science
Macrocyclic molecules such as crown ethers have useful ion-binding properties, and their incorporation into a matrix can create materials with new properties, especially if these ring structures are left free for binding metals. Sharma and Clearfield have now found that derivatized crown ethers bearing a phosphonate group can self-assemble into well-defined leaflet structures in the presence of the divalent metal ions Co2+ and Cd2+. In the Co2+ complex (2), the metal does not coordinate with the phosphonates; the self-assembly proceeds through hydrogen bonding to form a polyphosphonate chain. In the Cd2+ complex, the Cd cations form part of a more complicated one-dimensional polymer network.-PDS. J. Am. Chem. Soc.122, 1558 (2000).. ...
http://science.sciencemag.org/content/287/5459/1713.5
solutions - How do phase transfer catalysts bring anions to organic phase? - Chemistry Stack Exchangesolutions - How do phase transfer catalysts bring anions to organic phase? - Chemistry Stack Exchange
Actually, anions are not unstable in organic phases per se. There is no intrinsic physical property of organic phases that would make anions inherently unstable: the main problem is that most heteroatoms in organic solvents are more electronegative than carbon and therefore carry a slightly negative charge which attracts cations more easily than anions.. Most organic phases are best classified as ionophobe, however. They will not like cations or anions in their vicinity. Remember that organic phases are typically mainly hydrocarbons with the odd heteroatom, so they have a low polarisablility. Water, on the other hand, is a highly polarised dipole and able to stabilise both cations and anions easily with the appropriate side of the water molecule.. Now if we add a phase transfer catalyst to a biphasic mixture of water and an organic solvent - typical examples would be $\ce{Bu4N+ I-}$ or crown ethers - then these will readily transfer themselves into the organic phase. In the case of crown ethers, ...
https://chemistry.stackexchange.com/questions/74699/how-do-phase-transfer-catalysts-bring-anions-to-organic-phase
IUCr) Creation of a ternary complex between a crown ether, 4-amino-benzoic acid and 3,5-di-nitro-benzoic acidIUCr) Creation of a ternary complex between a crown ether, 4-amino-benzoic acid and 3,5-di-nitro-benzoic acid
Calculated speciation curves for (a) 3,5-dnba and (b) 4-aba in methanol. Lines between points have been added as a guide to the eye. ...
http://journals.iucr.org/b/issues/2014/01/00/bi5005/bi5005fig7.html
Meridional vs. facial coordination geometries of a dipodal ligand framework featuring a secondary coordination sphere -...Meridional vs. facial coordination geometries of a dipodal ligand framework featuring a secondary coordination sphere -...
Fingerprint Dive into the research topics of Meridional vs. facial coordination geometries of a dipodal ligand framework featuring a secondary coordination sphere. Together they form a unique fingerprint. ...
https://experts.illinois.edu/en/publications/meridional-vs-facial-coordination-geometries-of-a-dipodal-ligand-/fingerprints/
Icotinib
Icotinib is approved for the treatment for EGFR mutation-positive, advanced or metastatic non-small cell lung cancer (NSCLC). Upon initial approval, icotinib was indicated as a second-line or third-line treatment for patients who have failed at least one prior treatment with platinum-based chemotherapy. In 2014, icotinib was approved to treat NSCLC patients with EGFR mutation regardless of past chemotherapy use.[6] The ICOGEN trial was a double-blind, head-to-head phase III study comparing icotinib with gefitinib in all-comers. From 27 centers in China, 399 patients were randomized between the two treatments testing for a primary objective of progression-free survival and secondary objectives of overall survival, time to progression, quality of life, percentage of patients who achieved an objective response, and toxic effects. The ICOGEN results showed icotinib to have a median PFS of 4.6 months (95% CI 3.5 - 6.3) as compared to gefitinib which has a PFS of 3.4 months (95% CI 2.3 - 3.8). After ...
https://readtiger.com/wkp/en/Icotinib
Tunable fluorescent pH sensor based on water-soluble perylene tetracarboxylic acid/Fe(3+).
A novel fluorescent pH sensor with tunable response range was designed based on highly fluorescent 3,4:9,10-perylene tetracarboxylic ammonium, which could coordinate the paramagnetic Fe(3+) ions to turn off its fluorescence and could also release Fe
http://www.biomedsearch.com/nih/Tunable-fluorescent-pH-sensor-based/21984374.html
Process for the preparation of arylimides of perylene-3,4,9,10-tetracarboxylic acid - Patent # 4831140 - PatentGenius
Process for the preparation of compounds of the formula (1) ##STR1## in which R.sub.1 denotes a phenyl or naphthyl radical which can be substituted by alkyl, cycloalkyl, alkoxy, aryloxy, arylazo or nitro groups or halogen atoms, and R.sub.2 denotes a hydrogen atom or a phenyl or naphthyl radical which can be substituted by alkyl, cycloalkyl, alkoxy, aryloxy, arylazo or nitro groups or halogen atoms, or denotes an alkyl (C.sub.1 -C.sub.8) radical, by condensation, at between 100.degree. C. and 300.degree. C., of perylene-3,4,9,10-tetracarboxylic dianhydride or a monoanhydride monoimide of the formula (2) ##STR2## in which R.sub.2 has the abovementioned meaning, with an arylamine of the formula (3)in which R.sub.1 has the abovementioned meaning, in the presence of dialkylamines of the formula (4) ##STR3## in which R and R
http://www.patentgenius.com/patent/4831140.html
Icotinib Combined With WBRT For NSCLC Patients With Brain Metastases and EGFR Mutation - Full Text View - ClinicalTrials.govIcotinib Combined With WBRT For NSCLC Patients With Brain Metastases and EGFR Mutation - Full Text View - ClinicalTrials.gov
Level 1: Standard whole brain radiation therapy plus icotinib 125 mg Tid (375 mg per day) from day1 until disease progression or intolerable toxicity.. Level 2: Standard whole brain radiation therapy plus icotinib 250 mg Tid (750 mg per day) from day1 until disease progression or intolerable toxicity.. Level 3: Standard whole brain radiation therapy plus icotinib 375 mg Tid (1125 mg per day) from day1 until disease progression or intolerable toxicity.. Level 4:Standard whole brain radiation therapy plus icotinib 500 mg Tid (1500 mg per day) from day1 until disease progression or intolerable toxicity. ...
https://clinicaltrials.gov/show/NCT01516983
Theoretical Study on the Extraction of Alkaline Earth Salts by 18-Crown-6: Roles of Counterions, Solvent Types and Extraction...Theoretical Study on the Extraction of Alkaline Earth Salts by 18-Crown-6: Roles of Counterions, Solvent Types and Extraction...
Theoretical Study on the Extraction of Alkaline Earth Salts by 18-Crown-6: Roles of Counterions, Solvent Types and Extraction Temperatures
https://jurnal.ugm.ac.id/ijc/article/view/21259
Journal of the Korean Chemical Society (대한화학회지) | Korea ScienceJournal of the Korean Chemical Society (대한화학회지) | Korea Science
Methyl기를 포함하는 새로운 5종의 crown ether를 합성하였다. 2,3,4,5: 9,10,11,12-Dibenzo-8,8-dimethyl-15,18,1-trioxacycloeicosane, 2,3,4,5: 9,10,11,12-dibenzo-8,8-dimethyl-15,18,21,1-tetraoxacyclotricosane, 2,3,4,5 : 9,10,11,12-dibenzo-8,8-dimethyl-15,18,21,24,1-pentaoxacyclohexacosane, 2,3,4,5 : 9,10,11,12 : 22,23,24,25 : 29,30,31,32-tetrabenzo-8,8,28,28-tetramethyl-15,18,21,35,38,1-hexaoxacyclotetracontane 그리고 2,3,4,5 : 9,10,11,12 : 25,26,27,28:32,33,34,35-tetrabenzo-8,8,31,31-tetramethyl-15,18,21,24,38,41,44,1-octaoxacyclohexatetracontane은 (M = Na, K)존재하에서 4,4-isopropylidenediphenol과 di-, tri- 그리고 tetraethyleneglycol ditosylate의 반응에 의해 합성하였다. Diethyleneglycol ditosylate, triethyleneglycol ditosylate, tetraethyleneglycol ditosylate는 NaOH존재하에서 diethyleneglycol, triethyleneglycol 그리고 tetraethyleneglycol과 p-toluenesulfonylchloride의 반응에 의해 합성하였다 ...
https://koreascience.or.kr/journal/JCGMDC/v38n3.page
The isolation and X-ray structure of an adduct formed between 18-crown-6 and cisplatin - Stoddart Mechanostereochemistry Group
The isolation and X-ray structure of an adduct formed between 18-crown-6 and cisplatin, (D. R. Alston, J. F. Stoddart, and D. J. Williams), J. Chem. Soc., Chem. Commun. 1985, 9, 532-533. ...
https://stoddart.northwestern.edu/publications/the-isolation-and-x-ray-structure-of-an-adduct-formed-between-18-crown-6-and-cisplatin/
4′-(2,4-Dinitro-6-trifluoromethylphenyl)-aminobenzo-15-crown-5, CAS 78857-86-0 | SCBT - Santa Cruz Biotechnology4′-(2,4-Dinitro-6-trifluoromethylphenyl)-aminobenzo-15-crown-5, CAS 78857-86-0 | SCBT - Santa Cruz Biotechnology
Buy 4-(2,4-Dinitro-6-trifluoromethylphenyl)-aminobenzo-15-crown-5 (CAS 78857-86-0), a product for proteomics research, from Santa Cruz Biotechnology.
https://www.scbt.com/sv/p/4prime-2-4-dinitro-6-trifluoromethylphenyl-aminobenzo-15-crown-5-78857-86-0
Hybrid Host-Guest Complexes: Directing the Supramolecular Structure through Secondary Host-Guest Interactions - Streb - 2008 -...Hybrid Host-Guest Complexes: Directing the Supramolecular Structure through Secondary Host-Guest Interactions - Streb - 2008 -...
A set of four hybrid host-guest complexes based on the inorganic crown ether analogue [H12W36O120]12− ({W36}) have been isolated and characterised. The cluster anion features a central rigid binding site made up of six terminal oxygen ligands and this motif allows the selective binding of a range of alkali and alkali-earth-metal cations. Here, the binding site was utilised to functionalise the metal oxide-based cavity by complexing a range of protonated primary amines within the recognition site. As a result, a set of four hybrid organic-inorganic host-guest complexes were obtained whereby the interactions are highly directed specifically within this cavity. The guest cations in these molecular assemblies range from the aromatic 2-phenethylamine (1) and 4-phenylbutylamine (2) to the bifunctional aromatic p-xylylene diamine (3) and the aliphatic, bifunctional 1,6-diaminohexane (4). Compounds 1-4 were structurally characterised by single-crystal X-ray diffraction, elemental analysis, flame ...
http://onlinelibrary.wiley.com/doi/10.1002/chem.200801247/abstract
Neutral macrocycles and their interactions with amino acids and amines. Thermodynamic, electrochemical and structural studies...Neutral macrocycles and their interactions with amino acids and amines. Thermodynamic, electrochemical and structural studies...
The first part of this work deals with the interactions of amino acids and neutral macrocyclic ligands (18-crown-6 and cryptand 222). Solubilities and Gibbs energies of solution of several amino acids and their complexes with 18-crown-6 in acetonitrile, as well as of some amino acid ester salts in chloroform have been determined at 298.15 K. An increase in the solubility data for the amino acid complexes relative to the free amino acids has been found, as a result of the interactions of the guest molecules with the macrocyclic ligands. Stability constants, Gibbs energies, enthalpies and entropies of complexation of a series of L- and D-amino acids with 18-crown-6 and with cryptand 222 in methanol at 298.15 K were obtained by titration calorimetry. The similar Gibbs energies of complexation found for these systems are the result of an enthalpy-entropy compensation effect. No significant differences have been found between the thermodynamic parameters of complexation of the L- and D-amino acids ...
http://epubs.surrey.ac.uk/843851/
A thermodynamic study on cation dibenzocryptand 222 and cation-dibenzo 18 crown 6 complexation in non-aqueous media. - Surrey...A thermodynamic study on cation dibenzocryptand 222 and cation-dibenzo 18 crown 6 complexation in non-aqueous media. - Surrey...
A general review on macrocyclic ligands with particular emphasis to dibenzocryptand 222 and dibenzo 18 crown 6 is given in the first part of the thesis (Chapter 1). This is followed by an exhaustive literature survey on the stability constants (hence free energies of complexing), enthalpies and entropies of metal cations with cryptands (dibenzocryptand 222, benzocryptand 222, cryptand 222) and crown ethers (dibenzo 18 crown 6, benzo 18 crown 6, 18 crown 6) in water and in non-aqueous solvents at 298.15 (Chapter 2). The experimental part (Chapter 3) also includes a detailed description of the principals involved in calorimetry as well as the methods used for the calculation of reaction enthalpies. Stability constant data for alkali-metal and silver cations with dibenzocryptand 222 in five dipolar aprotic solvents (N,N dimethyl-formamide, dimethylsulphoxide, acetonitrile, propylene carbonate and nitromethane) at 298.15 K are reported. These data are used to calculate the standard free energies of ...
http://epubs.surrey.ac.uk/844484/
Nanosized thermometric NMR sensors based on the paramagnetic complex ion pairs of lanthanides(III) for temperature...
TY - JOUR. T1 - Nanosized thermometric NMR sensors based on the paramagnetic complex ion pairs of lanthanides(III) for temperature determinations in low-polar nonaqueous solutions. AU - Babailov, S. P.. PY - 2008/5. Y1 - 2008/5. N2 - For temperature determination in solutions it is suggested that the temperature dependence of the paramagnetic lanthanide-induced shifts (LIS) in the NMR spectra on the ligand nuclei be used for [Ln(PTA)2(18-crown- 6)]+[Ln(PTA)4]- complex ion pairs formed in CCl4, CDCl3, CD2Cl2, CD 3C6D5, and C2D3N type low-polar solvents (Ln = La, Ce, Pr, Nd, Eu; PTA is the pivalyltrifluoroacetonato anion). It was found experimentally that the [Ln(PTA)2(18-crown-6)]+ complex cation molecules (Ln = Ce and Pr) proved most suitable for use as nanosized (≈1.1 nm) probes for temperature determinations in nonaqueous solutions. A linear dependence of the LIS on the 1H nuclei of different groups and the difference between the LIS corresponding to the CH2 groups of the 18-crown-6 ...
https://tpu.pure.elsevier.com/en/publications/nanosized-thermometric-nmr-sensors-based-on-the-paramagnetic-comp
Benzene-1,2,4,5-tetracarboxylic acid, compound... - Registration Dossier - ECHABenzene-1,2,4,5-tetracarboxylic acid, compound... - Registration Dossier - ECHA
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice ...
https://echa.europa.eu/lv/registration-dossier/-/registered-dossier/12058/7/9/1
Benzene-1,2,4,5-tetracarboxylic acid, compound... - Registration Dossier - ECHABenzene-1,2,4,5-tetracarboxylic acid, compound... - Registration Dossier - ECHA
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice ...
https://echa.europa.eu/registration-dossier/-/registered-dossier/13708/4/13
Sodium ion effect on photoinduced electron transfer of porphyrin-crown ether-affixed quaterthiophene-[60]fullerene triad as a...
TY - GEN. T1 - Sodium ion effect on photoinduced electron transfer of porphyrin-crown ether-affixed quaterthiophene-[60]fullerene triad as a gated molecular switch. AU - Araki, Yasuyuki. AU - Zhang, Huimin. AU - Ito, Osamu. AU - Oike, Takuro. AU - Kurata, Tomoyuki. AU - Takimiya, Kazuo. AU - Otsubo, Tetsuo. AU - Aso, Yoshio. PY - 2007. Y1 - 2007. N2 - A porphyrin-quaterthiophene-fullerene triad, in which the center of the quaterthiophene spacer is additionally bridged with a crown ether chain in a sash manner (abbreviated as H2P-(2T(crown)2T)-CM), has been newly synthesized. Photoinduced charge-separation (CS) and charge-recombination processes in the absence and presence of Na+ have been investigated by time-resolved fluorescence and transient absorption spectroscopic methods. Upon photo-excitation of H2P-(2T(crown)2T)-C60 in benzonitrile, CS via 1H2P* generating H 2P*+-2T(crown)2T-C60*- took place, followed by a hole shift to a more energetically stable H 2P-(2T(crown)2T)*+-C60* -. In the ...
https://tohoku.pure.elsevier.com/en/publications/sodium-ion-effect-on-photoinduced-electron-transfer-of-porphyrin-
Synthesis and Molecular Structure of the First Metallamacrocyclic Bi(III)-Cu(II) 15-MC-5 Complex Derived from...
G. S. Zabrodina,@ M. A. Katkova, E. V. Baranov, G. Yu. Zhigulin, and S. Yu. Ketkov. G.A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, 603905 Nizhny Novgorod, Russia. @Corresponding author E-mail: [email protected] Dedicated to Professor Dieter Wöhrle on the occasion of his 80th Birthday. DOI: 10.6060/mhc190866z. Macroheterocycles 2019 12(3) 300-306. Polynuclear metallamacrocyclic complexes named as metallacrowns are considered as a promising exceptional class of macroheterocyclic compounds that structurally resembles crown ethers. In this communication, we report a general synthetic approach and characterization of the first metallamacrocyclic Bi(III)-Cu(II) 15-MC-5 complex derived from pyrazinohydroxamic acid. The molecular and crystal structures of complex were determined from single-crystal X-ray diffraction studies. The single‐crystal structure reveals the classic metallamacrocyclic 15‐MC‐5 configuration. The Bi(III) ion is located at the center of the ...
https://macroheterocycles.isuct.ru/en/mhc190866z
INKJET-RECEPTIVE ARTICLE - Patent applicationINKJET-RECEPTIVE ARTICLE - Patent application
0066] In a preferred embodiment of this application, the chelating agent employed for the preparation of solvent based compositions is selected from the group comprising polyols, gluconates, sorbitals, mannitols, carbonates, heptonates, hydroxamates, catechols, α-amino carboxylates, alkanolamines, metal-ion sequestrants, hydroxy-carboxylic acids, aminocarboxylic acids, amino polycarboxylic acids, polyamines, polyphosphates, phosphonic acids, crown ethers, amino acids, polycarboxylic acids, cyclodextrin, phosphonates, polyacrylates or polymeric polycarboxylates and condensed phosphates. However, the particular sequestering or chelating agents of the present application would include but are not limited to acetic acid, adenine, adipic acid, ADP, alanine, alanine, albumin, arginine, ascorbic acid, asparagine, aspartic acid, ATP, benzoic acid, n-butyric acid, casein, citraconic acid, citric acid, cysteine, dehydracetic acid, desferri-ferrichrysin, desferri-ferrichrome, desferri-ferrioxamin E, ...
http://www.patentsencyclopedia.com/app/20120027964
US6232783B1 - Method for monitoring an aqueous flow using selective film - Google Patents
A method and apparatus for detecting contaminants in an aqueous flow. The method includes the steps of providing a conduit having at least one collection portion upon which is disposed a selective film, disposing the aqueous flow through the conduit, attracting contaminants to the collection portion such that they are bonded to the selective film, and detecting a contaminant, or contaminants, based upon a predetermined property of the plurality of contaminants bonded to the ion collection portion. The selective film may include a molecularly imprinted polymer, a crown ether, an antibody selective for biological contaminants, such as Giardia Lamblia and cryptosporidia, or for detecting organics such as dioxin or furan, a cyclodextrin, or a cyclophane. The apparatus includes a conduit having an collection portion with a selective film disposed thereon, a sensor that senses contaminants collected on the collection portion and sends a signal corresponding to a value of a predetermined property of the
https://patents.google.com/patent/US6232783
Silicone grease - WikipediaSilicone grease - Wikipedia
Silicone grease is widely used as a temporary sealant and a lubricant for interconnecting ground glass joints, as is typically used in laboratory glassware. Although silicones are normally assumed to be chemically inert, several historically significant compounds have resulted from unintended reactions with silicones.[3][4] The first salts of crown ethers (OSi(CH3)2)n (n = 6, 7) were produced by reactions of organolithium and organopotassium compounds with silicone greases[5] or the serendipitous reaction of stannanetriol with silicone grease to afford a cage-like compound having three Sn-O-Si-O-Sn linkages in the molecule.[6]. Lubrication of an apparatus with silicone grease may result in the reaction mixture being contaminated with the grease. The impurity may be carried through purification by chromatography in undesirable amounts. In NMR spectroscopy, the methyl groups in polydimethylsiloxane display 1H and 13C chemical shifts similar to trimethylsilane (TMS), the reference compound for ...
https://en.m.wikipedia.org/wiki/Silicone_grease
Fig. 4: Photovoltaic device performance. | Nature CommunicationsFig. 4: Photovoltaic device performance. | Nature Communications
a Photovoltaic metrics of devices without Cs doping (control), with homogeneous Cs doping, after treatment with DB21C7-CsI (target) and after just crown ether (DB21C7) treatment. b J-V curves of the champion control and target PSCs. The inset shows the maximum power point tracking data. An anti-reflection coating was used for the champion devices. c Photoluminescence spectral photon flux Φ measured on full devices. d Breakdown of losses derived from the J-V curves in b; radiative JSC and VOC losses are shown in green and grey, respectively; non-radiative VOC and FF losses in black and red; transport losses affecting FF in blue. ...
https://www.nature.com/articles/s41467-021-23566-2/figures/4?error=cookies_not_supported&code=ed3e6e7d-96fa-4205-9515-ef9e0c576cb2
Nickel complexes of a binucleating ligand derived from an SCS pincer - Dalton Transactions (RSC Publishing)Nickel complexes of a binucleating ligand derived from an SCS pincer - Dalton Transactions (RSC Publishing)
A binucleating ligand has been prepared that contains an SCS pincer and three oxygen donor atoms in a partial crown ether loop. To enable metalation with Ni0, a bromoarene precursor was used and resulted in the formation of a nickel-bromide complex in the SCS pincer portion of the ligand. Reaction of the nic
http://pubs.rsc.org/en/Content/ArticleLanding/2015/DT/C4DT02718C
N,N-(dicyclohexyl) perylene-3,4,9,10-tetracarboxylic diimide-coated titanium dioxide nanotube arraysN,N-(dicyclohexyl) perylene-3,4,9,10-tetracarboxylic diimide-coated titanium dioxide nanotube arrays
Page contains details about N,N-(dicyclohexyl) perylene-3,4,9,10-tetracarboxylic diimide-coated titanium dioxide nanotube arrays . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
http://nano.nature.com/nano/GR-M8322567
Aromatic Tetracarboxylic Dianhydrides | Reagent for High-Performance Polymer Research | Spectrum ChemicalAromatic Tetracarboxylic Dianhydrides | Reagent for High-Performance Polymer Research | Spectrum Chemical
Get Aromatic Tetracarboxylic Dianhydrides at Spectrum Chemical. SpectrumChemical.com carries a full line of fine chemicals, lab appliances and lab su Spectrum Chemical offers fine chemicals in lab and production sizes.
https://www.spectrumchemical.com/OA_HTML/Chemicals_TCI-Organic-Chemicals_Functional-Materials_Reagent-for-High-Performance-Polymer-Research_Aromatic-Tetracarboxylic-Dianhydrides.jsp?queryStr=C
High Nitrogen Explosives. Part 2. Dibenzo-1 ,3a,4,6a- Tetraazapentalenes and Benzo-1 2,3,4-Tetrazine-1,3-Dioxides.
High nitrogen materials are sought as a potentially dense, powerful but insensitive explosive and propellant ingredients. Elucidation of the structure and chemistry of dibenzo-1 ,3a,4,6a-tetraazapentalenes has continued, with particular attention to a putative C12N12O12 derivative initially prepared at the University of New Orleans. This research contributed substantially to identification of the actual o-quinone hydrate structure, and explanation of the apparently anomalous explosive insensitivity of the material. Synthesis of the novel 5,7-dinitrobenzo-1 ,2,3,4-tetrazine-1,3-dioxide has been repeated, its structure has been confirmed, and preliminary evaluation of its explosive sensitivity has been completed.*NITROGEN
http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA313360
New mixed-ligand complexes of cobalt(II) - Publications of the IAS FellowsNew mixed-ligand complexes of cobalt(II) - Publications of the IAS Fellows
Balundgi, R. H. ; Chakravorty, A. (1973) New mixed-ligand complexes of cobalt(II) Inorganic and Nuclear Chemistry Letters, 9 (10). pp. 1045-1048. ISSN 0020-1650 Full text not available from this repository.. Official URL: http://www.sciencedirect.com/science/article/pii/0.... Related URL: http://dx.doi.org/10.1016/0020-1650(73)80108-4 ...
http://repository.ias.ac.in/95251/
Optical Determination of Thallium(I) and Cesium(I) with a Fluorogenic Calix[4]arenebis(crown-6 ether) Containing One Pendent...Optical Determination of Thallium(I) and Cesium(I) with a Fluorogenic Calix[4]arenebis(crown-6 ether) Containing One Pendent...
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https://www.infona.pl/resource/bwmeta1.element.acs-doi-10_1021_ac061387c
How to make a Felt Birthday Crown- Handwork as a Sacred Art | Deep River of SongHow to make a Felt Birthday Crown- Handwork as a Sacred Art | Deep River of Song
This week, I made a birthday crown for Ember. It was a rare opportunity... As my sons primary caregiver, I do most of my crafting in the spaces between
http://www.noevenable.com/singingcircles/2015/09/10/how-to-make-a-felt-birthday-crown-handwork-as-a-sacred-art/?replytocom=39
Szymczak GroupSzymczak Group
Our research program uses fundamental principles of molecular design to address some of the grand challenges in the fields of small molecule activation and catalysis. We are interested in developing strategies to reversibly store energy in the form of chemical bonds, and also to rapidly convert abundant chemical (bio)feedstocks into value-added chemicals and fuels.. The overarching themes of our research program are to (a) understand how to exploit carefully positioned secondary-sphere sites to control reactivity, and (b) develop transition metal compounds to promote otherwise difficult transformations of small molecule chemical feedstocks such as N2, CO2, O2, and CO.. We are working to establish new ways by which molecular catalysts can be tuned by the incorporation of pendent functional groups within a metals secondary coordination sphere environment. We are using these appended functional groups (hydrogen bond donor/acceptors, or Lewis acid/bases) to augment reactivity of the central ...
http://www.umich.edu/~szymlab/research.html
Sulfosalicylic Acid 10% Solution - Lab AlleySulfosalicylic Acid 10% Solution - Lab Alley
Buy Sulfosalicylic Acid, 10% (w/v) Aqueous Solution | 1 Liter Bottle | For Urine Tests | CAS # 97-05-2 | For Sale Online | Shipped By UPS In The U.S.
https://www.laballey.com/products/sulfo-salicylic-acid-10-solution
Molecular sensorMolecular sensor
Sousa, Lynn R.; Larson, James M. (1977-01-01). "Crown ether model systems for the study of photoexcited state response to ... Interaction of saxitoxin with the sensor's crown ether moiety kills its PET process towards the fluorophore and fluorescence is ... Silva, A. Prasanna de; Silva, Saliya A. de (1986-01-01). "Fluorescent signalling crown ethers; 'switching on' of fluorescence ...
https://en.wikipedia.org/wiki/Molecular_sensor
Charles J. PedersenCharles J. Pedersen
Possibly, the crown ethers will serve, in a small way, to mark my footprint on earth" and Izatt believing this too shares ... It was while working on this research that Pedersen made his discovery of crown ether. Through studying the bio[2-(o- ... Izatt was looking forward to the possibilities of studying these crown ethers with his thermionic titration technique. Izatt ... Pedersen, Charles J (1988). "The Discovery of Crown Ethers". Science. 241 (4865): 536-540. Bibcode:1988Sci...241..536P. doi: ...
https://en.wikipedia.org/wiki/Charles_J._Pedersen
Molecular switchMolecular switch
10.1021/ja00538a026 Photoresponsive crown ethers. 2. Photocontrol of ion extraction and ion transport by a bis(crown ether) ... 85550-7 Photoresponsive crown ethers. 1. Cis-trans isomerism of azobenzene as a tool to enforce conformational changes of crown ... Preparation of a crown-ether by photocycloisomerization Jean-Pierre Desvergne and Henri Bouas-Laurent J. Chem. Soc., Chem. ... construct a crown ether already incorporating the anthracene units (an anthracenophane) and also study ion uptake vs ...
https://en.wikipedia.org/wiki/Molecular_switch
Transition metal thioether complexTransition metal thioether complex
Thiacrown ligands are analogous to crown ethers. The best studied thiacrown ligands have the formula (SCH2CH2)n (n = 3,4,5,6). ... Unlike ethers, thioethers occasionally serve as bridging ligands. The complexes Nb2Cl6(SMe2)3 is one such example. It adopts a ... complexes with 12-16-membered cyclic tetrathia ethers". Inorganic Chemistry. 22 (24): 3661-3670. doi:10.1021/ic00166a033. Shaw ...
https://en.wikipedia.org/wiki/Transition_metal_thioether_complex
Macrocyclic ligandMacrocyclic ligand
Some Macrocyclic Ligands and Their Complexes The silver complex of a thia-crown ether [Ag(18-ane-S6)]2+ Crystal structure of a ... Crown ethers and porphyrins are prominent examples. Macrocyclic ligands exhibit high affinity for metal ions. Porphyrins and ... A few years later, three-dimensional analogs of crown ethers called "cryptands" were reported by Lehn and co-workers. ... Iron(tetraporphyriinato) chloride cyclam is a popular aza-crown ether The macrocyclic effect is the high affinity of metal ...
https://en.wikipedia.org/wiki/Macrocyclic_ligand
Chiral analysisChiral analysis
Crown ethers, like cyclodextrin-type CSPs contain a chiral cavity. Crown ethers are immobilized on the silica surface to form ... Crown ethers contain oxygen atoms within the cavity. The cyclic structure that contains apolar ethylene groups between oxygen ... Cram et al., introduced CSP based on chiral crown ethers and accomplished separation of amino acid. The crucial chiral ... Progress in the field of crown ether-type CSPs have been reviewed. Proteins are complex, high-molecular weight biopolymers. ...
https://en.wikipedia.org/wiki/Chiral_analysis
Gillian ReidGillian Reid
Dications Stabilized by Azamacrocycles and Crown Ethers". Angewandte Chemie. 121 (28): 5254-5256. Bibcode:2009AngCh.121.5254C. ...
https://en.wikipedia.org/wiki/Gillian_Reid
PolyphosphazenePolyphosphazene
"Cation Complexation and Conductivity in Crown Ether Bearing Polyphosphazenes". Macromolecules. 29 (23): 7544-7552. Bibcode: ... H. R. Allcock; S. R. Pucher; M. L. Turner; R. J. Fitzpatrick (1992). "Poly(organophosphazenes) with Poly(alkyl ether) Side ... Other side groups, such as non-fluorinated alkoxy or oligo-alkyl ether units, yield hydrophilic or hydrophobic elastomers with ...
https://en.wikipedia.org/wiki/Polyphosphazene
Supramolecular catalysisSupramolecular catalysis
In 1976, less than ten years after the discovery of crown ether, Cram et al. developed a functionalized binapthyl crown ether ... The catalyst makes use the crown ether motif's ability to capture cation to bind to the ammonium ion part of the substrate and ... A notable example of catalysts that employ this mechanism is Jean-Marie Lehn's crown ether. In addition, catalysts based on ... Self-assembled molecules have an advantage over crown ether and cyclodextrin in that they can capture significant larger ...
https://en.wikipedia.org/wiki/Supramolecular_catalysis
Germanium(II) dicationic complexesGermanium(II) dicationic complexes
Ge(II) cationic species have been isolated with several crown ether ligands, including [12]crown-4, [15]crown-5, and [18]crown- ... such as crown ethers and [2.2.2]cryptand. Crown ethers and cryptands are typically known for their ability to bind metal ... In the Ge(II) crown ether complexes presented above, only the sandwich complex with [12]crown-4 clearly bears a ... germanium crown ether complexes can adopt different geometries and cation charges depending on the size of the crown ether and ...
https://en.wikipedia.org/wiki/Germanium(II)_dicationic_complexes
MacrocycleMacrocycle
The crown ethers are often generated in the presence of an alkali metal cation, which organizes the condensing components by ... Classical examples include the crown ethers, calixarenes, porphyrins, and cyclodextrins. Macrocycles describe a large, mature ... Pedersen, Charles J. (1988). "Macrocyclic Polyethers: Dibenzo-18-Crown-6 Polyether and Dicyclohexyl-18-Crown-6 Polyether". ... from flexible crown ethers to rigid cyclophanes". Chemical Society Reviews. 46 (9): 2459-2478. doi:10.1039/c7cs00185a. PMID ...
https://en.wikipedia.org/wiki/Macrocycle
Α-CyclodextrinΑ-Cyclodextrin
... from flexible crown ethers to rigid cyclophanes". Chemical Society Reviews. 46 (9): 2367-2650. doi:10.1039/c7cs00185a. PMID ...
https://en.wikipedia.org/wiki/Α-Cyclodextrin
SodiumSodium
Crown ethers, like 15-crown-5, may be used as a phase-transfer catalyst. Sodium content of samples is determined by atomic ... Sodium forms complexes with crown ethers, cryptands and other ligands. For example, 15-crown-5 has a high affinity for sodium ... because the cavity size of 15-crown-5 is 1.7-2.2 Å, which is enough to fit the sodium ion (1.9 Å). Cryptands, like crown ethers ...
https://en.wikipedia.org/wiki/Sodium
Sodium compoundsSodium compounds
Crown ethers, like 15-crown-5, may be used as a phase-transfer catalyst. Sodium content of samples is determined by atomic ... Sodium forms complexes with crown ethers, cryptands and other ligands. For example, 15-crown-5 has a high affinity for sodium ... because the cavity size of 15-crown-5 is 1.7-2.2 Å, which is enough to fit the sodium ion (1.9 Å). Cryptands, like crown ethers ...
https://en.wikipedia.org/wiki/Sodium_compounds
Template reactionTemplate reaction
Crown ethers arise from dialkylations that are templated by alkali metals. Other template reactions include the Mannich and ... The alkali metal-templated syntheses of crown ether syntheses are notable exceptions. Metal Phthalocyanines are generated by ... The phosphorus analogue of an aza crown can be prepared by a template reaction. Where it is not possible to isolate the ... George W. Gokel; Donald J. Cram; Charles L. Liotta; Henry P. Harris; Fred L. Cook (1988). "18-Crown-6". Organic Syntheses.; ...
https://en.wikipedia.org/wiki/Template_reaction
IonophoreIonophore
Many synthetic ionophores are based on crown ethers, cryptands, and calixarenes. Pyrazole-pyridine and bis-pyrazole derivatives ...
https://en.wikipedia.org/wiki/Ionophore
Coordination sphereCoordination sphere
Crown-ethers bind to polyamine complexes through their second coordination sphere. Polyammonium cations bind to the nitrogen ...
https://en.wikipedia.org/wiki/Coordination_sphere
PolythiophenePolythiophene
PTs with pendant crown ether functionalities exhibit properties that vary with the alkali metal. and main-chain. Polythiophenes ... Bäuerle, Peter; Scheib, Stefan (1993). "Molecular recognition of alkali-ions by crown-ether-functionalized poly(alkylthiophenes ... selective ionochromic response in crown ether-containing polythiophenes". Journal of the American Chemical Society. 115 (25): ... and not diethyl ether, xylene, acetone, or formic acid), and speculated that the polymerization may occur at the surface of ...
https://en.wikipedia.org/wiki/Polythiophene
Phase-transfer catalystPhase-transfer catalyst
In the research lab, crown ethers are used for this purpose. Polyethylene glycols are more commonly used in practical ... and the sodium cyanide does not dissolve well in the ether. Upon the addition of small amounts of hexadecyltributylphosphonium ...
https://en.wikipedia.org/wiki/Phase-transfer_catalyst
Christian CambillauChristian Cambillau
... has also been the director and co-director of many Ph.D.'s •Chemistry: Biomimetic chemistry, crown ethers ... crown-ether and cryptates). After his Ph.D. (1978) he spent one year at ONERA for his military service. He was then hired by ...
https://en.wikipedia.org/wiki/Christian_Cambillau
FuregrelateFuregrelate
... a crown ether was used. Ester product 5 was then transformed to Furegrelate sodium salt 6 using methanol and sodium hydroxide ...
https://en.wikipedia.org/wiki/Furegrelate
CaesiumCaesium
"Complexation of caesium and rubidium cations with crown ethers in N,N-dimethylformamide". Polyhedron. 15 (21): 3897-3903. doi: ...
https://en.wikipedia.org/wiki/Caesium
Penetration enhancersPenetration enhancers
These include chelating agents, cyclodextrins, surfactants, bile acids and salts, and crown ethers. There are also reports on ...
https://en.wikipedia.org/wiki/Penetration_enhancers
Synthetic ion channelsSynthetic ion channels
... such as crown ethers of different sizes. The property of these peptide-crown channels depend strongly on the identity of the ... The above diagram illustrates one example, where a crown-ether was fixed across the mouth of the ion-passing portal. This ... Jochen R. Pfeifer; Philipp Reiß; Ulrich Koert (2005). "Crown Ether-Gramicidin Hybrid Ion Channels: Dehydration-Assisted Ion ...
https://en.wikipedia.org/wiki/Synthetic_ion_channels
SiloxaneSiloxane
Even though some cyclomethicones structurally resemble crown ethers, they bind metal ions only weakly. The word siloxane is ... "Dichlorosilane-dimethyl ether aggregation: a new motif in halosilane adduct formation". Dalton Trans., 2004, 2578-2581. doi: ... O distance in a typical dialkyl ether is much shorter at 1.414(2) Å with a more acute C−O−C angle of 111°. It can be ...
https://en.wikipedia.org/wiki/Siloxane
Potassium superoxidePotassium superoxide
Since the salt is poorly soluble in nonpolar solvents, crown ethers are typically used. The tetraethylammonium salt is also ...
https://en.wikipedia.org/wiki/Potassium_superoxide
Silicone greaseSilicone grease
The first salts of crown ethers (OSi(CH3)2)n (n = 6, 7) were produced by reactions of organolithium and organopotassium ... Jamie S. Ritch and Tristram Chivers (2007). "Silicon Analogues of Crown Ethers and Cryptands: A New Chapter in Host-Guest ...
https://en.wikipedia.org/wiki/Silicone_grease
Molecular logic gateMolecular logic gate
A bodipy dye attached to a crown-ether and two pyridyl groups separated by spacers (as shown below) works according to an AND ... Excess acid locks the crown ether by protonation and again the complex is dethreaded. A full adder system based on fluorescein[ ... This process is accompanied by an increase in emission intensity at 343 nm resulting from freed crown ether. Added ... phenyldiaminocarboxylate and crown ether receptors. The processing mode operates similarly as discussed above - fluorescence is ...
https://en.wikipedia.org/wiki/Molecular_logic_gate
Donor numberDonor number
"Critical evaluation of stability constants and thermodynamic functions of metal complexes of crown ethers". Pure Appl. Chem. 75 ...
https://en.wikipedia.org/wiki/Donor_number
Artificial enzymeArtificial enzyme
Classically, artificial enzymes bind substrates using receptors such as cyclodextrin, crown ethers, and calixarene. Artificial ...
https://en.wikipedia.org/wiki/Artificial_enzyme
Aktivni transport - Wikipedija, prosta enciklopedijaAktivni transport - Wikipedija, prosta enciklopedija
... valinomycin and 18-crown-6 ether". International Journal of Computational Biology and Drug Design. Vol. 9 no. 3. str. 228. doi: ...
https://sl.m.wikipedia.org/wiki/Aktivni_transport
Coronavirus - Simple English Wikipedia, the free encyclopediaCoronavirus - Simple English Wikipedia, the free encyclopedia
The virus was inactivated by ether which showed it had a lipid envelope.[22][27][28] The novel virus caused a cold in ... The name "coronavirus" comes from the Latin word corona, meaning "crown" or "halo", and refers to how virions look under an ... This new group of viruses were called "coronaviruses" from their crown-like appearance.[36][37] The coronavirus strain B814 was ... electron microscopy (E.M.).[9] They have a fringe of large, bulbous surface projections looking like a crown. This morphology ...
https://simple.wikipedia.org/wiki/Coronavirus
Max PlanckMax Planck
... the crown of the edifice of every generalized world view".[41] ...
https://en.wikipedia.org/wiki/Max_Planck
வினை மின்முனை - தமிழ் விக்கிப்பீடியாவினை மின்முனை - தமிழ் விக்கிப்பீடியா
"Potentiometric stripping analysis of antimony based on carbon paste electrode modified with hexathia crown ether and rice husk" ...
https://ta.wikipedia.org/wiki/வினை_மின்முனை
Transgender hormone therapyTransgender hormone therapy
Levy A, Crown A, Reid R (October 2003). "Endocrine intervention for transsexuals". Clin. Endocrinol. (Oxf). 59 (4): 409-18. doi ... Diethylstilbestrol esters/ethers *Dimestrol (diethylstilbestrol dimethyl ether). *Fosfestrol (diethylstilbestrol diphosphate). ...
https://en.wikipedia.org/wiki/Hormone_replacement_therapy_
List of DuPont Experimental Station inventionsList of DuPont Experimental Station inventions
... elastomer Viton fluoroelastomer Kalrez perfluoroelastomer Vamac ethylene acrylic elastomer Nobel Prize work on crown ethers by ...
https://en.wikipedia.org/wiki/List_of_DuPont_Experimental_Station_inventions
Benjamin FranklinBenjamin Franklin
Georgia, New Jersey, and Massachusetts also appointed him as their agent to the Crown. During his lengthy missions to London ... experimented by continually wetting the ball of a mercury thermometer with ether and using bellows to evaporate the ether. With ... proving that they had encouraged the Crown to crack down on Bostonians. Franklin sent them to America, where they escalated ... that was known for its revolutionary sentiments and criticisms of the policies of the British Parliament and the Crown. He ...
https://en.wikipedia.org/wiki/Benjamin_Franklin
October 16October 16
1384 - Jadwiga is crowned King of Poland, although she is a woman. 1590 - Prince Gesualdo of Venosa murders his wife and her ... 1846 - William T. G. Morton administers ether anesthesia during a surgical operation. 1847 - The novel Jane Eyre is published ...
https://en.wikipedia.org/wiki/October_16
Dogra dynastyDogra dynasty
Yuvraj (Crown Prince) Karan Singh after serving as the President of Jammu and Kashmir from 1952 to 1964 would go on to become ... Kalhana's Rajatarangini makes no mention of a kingdom by this name, but it could have been referred to by its capital (ether ... His son Yuvraj (Crown Prince) Karan Singh too abdicated and was elected Sadr-e-Riyasat ('President of the Province') and ... Crown Prince) Karan Singh, who subsequently accepted the position of a constitutional head of state (Sadr-i-Riyasat) and ...
https://en.wikipedia.org/wiki/Dogra_dynasty
Biofuel in the United StatesBiofuel in the United States
... and the 5.0L LTD Crown Victoria. These vehicles could operate on either gasoline or methanol with only one fuel system. ... for bioethanol fuel in the United States was stimulated by the discovery in the late 90s that methyl tertiary butyl ether (MTBE ... demand for ethanol fuel in the United States was stimulated by the discovery in the late 1990s that methyl tertiary butyl ether ...
https://en.wikipedia.org/wiki/Biofuel_in_the_United_States
Golden platesGolden plates
Book of Mormon, Ether 3:22. Quinn (1998, pp. 195-196). Book of Mormon, Ether 4:5. According to Martin Harris, anyone who looked ... "The mode of procedure consisted in Joseph's placing the Seer Stone in the crown of a hat, then putting his face into the hat, ... recorded by Ether on a set of 24 plates later found by Limhi, and then "sealed up". Book of Mormon, Ether 1:2. According to ... 11-12). Smith's dictated text of the Book of Ether (chapter 2) also made reference to three witnesses, stating that the plates ...
https://en.wikipedia.org/wiki/Golden_plates
History of paintingHistory of painting
During British rule in India, the crown found that Madras had some of the most talented and intellectual artistic minds in the ... Long after personal, political and professional tensions have fragmented the Surrealist group into thin air and ether, Magritte ...
https://en.wikipedia.org/wiki/History_of_painting
Single-walled carbon nanohornSingle-walled carbon nanohorn
Zinc porphyrin could also bind to oxidized SWNHs through covalent bonding with a spacer and a crown ether. This nanohybrid ...
https://en.wikipedia.org/wiki/Single-walled_carbon_nanohorn
Goldman SachsGoldman Sachs
New York: Crown Business. ISBN 978-0-307-46011-0. Brenner, Robert (2009). What is Good for Goldman Sachs is Good for America - ... In June 2022, Goldman Sachs offered its first ever derivatives product linked to Ether (ETH). Goldman Sachs was announced as an ... Carney, John (September 16, 2011). "How Goldman Sachs Lost One Of Its Crown Jewels, Global Alpha". Business Insider via CNBC. ... Mishra, Parikshit (June 13, 2022). "Goldman Sachs just executed its first trade of derivative linked to Ether". Fortune. " ...
https://en.wikipedia.org/wiki/Goldman_Sachs
Index of ancient Greece-related articlesIndex of ancient Greece-related articles
On Spirals On the Chersonese On the Crown On the Equilibrium of Planes On the False Embassy On the Halonnesus On the Heavens On ... Aether (mythology) Aethlius Aethon Aethra Aethra (mother of Theseus) Aetion Aetius (philosopher) Aetna Aetnaeus Aetolia ... Aeschines of Sphettus Aeschylus Aeschylus of Rhodes Aeson Aesop Aesop's Fables Aesymnetes Aethalidae Aethalides Aether ( ...
https://en.wikipedia.org/wiki/Index_of_ancient_Greece-related_articles
Convention on Psychotropic SubstancesConvention on Psychotropic Substances
Neither the crown (fruit, mescal button) of the Peyote cactus nor the roots of the plant Mimosa hostilis, Peganum Harmala that ... Circa 1999, the Government of Spain proposed amending Schedules I and II to include isomers, esters, ethers, salts of isomers, ... Neither the crown (fruit, mescal button) of the Peyote cactus nor the roots of the plant Mimosa hostilis nor Psilocybe ... esters and ethers, and any "substance resulting from modification of the chemical structure of a substance already in Schedule ...
https://en.wikipedia.org/wiki/Convention_on_Psychotropic_Substances
Xenoblade Chronicles (video game)Xenoblade Chronicles (video game)
My body, your bodies... You are aware that ether is the foundation of them all? / Shulk: Yes. / Egil: Ether is power. You are ... The scenario ends with Melia being crowned as Empress of the High Entia. Xenoblade Chronicles was developed by Japanese ... Aside from the Collectopaedia, there are also ether crystals to be found from fallen enemies or ether crystal deposits, which ... A substance known as ether is given off by all life forms, and can be used both as a form of magic and as a method of fuel. The ...
https://en.wikipedia.org/wiki/Xenoblade_Chronicles_(video_game)
Greed (1924 film)Greed (1924 film)
Flamini, Roland (1994). Thalberg: The Last Tycoon and the World of M-G-M. New York: Crown Publisher, Inc. ISBN 0-517-58640-1. ... These cuts included the administration of ether in the dental scenes and certain instances of foul language. Although these ...
https://en.wikipedia.org/wiki/Greed_(1924_film)
List of Greyhawk charactersList of Greyhawk characters
Melf is known to have authored or co-authored the following works: Treatise of Universal Astronomy Weapons of the Ether (with ... the infamous wizard featured in the module White Plume Mountain using a magical device called the Crown of Mortality. According ...
https://en.wikipedia.org/wiki/List_of_Greyhawk_characters
List of International Organization for Standardization standards, 1-1999List of International Organization for Standardization standards, 1-1999
Crowns [Withdrawn: replaced with ISO 22] ISO/R 101:1959 Width of sheets of paper [Withdrawn without replacement] ISO 102:1990 ... Determination of diethyl ether extract [Withdrawn without replacement] ISO 737:1975 Coniferous sawn timber - Sizes - Methods of ... Determination of matter extractable by diethyl ether ISO 1876 Swing doors - Dimensioning rules [Rejected draft] ISO 1877 Single ... Determination of non-volatile ether extract ISO 1109:1975 Refractory products - Classification of dense shaped refractory ...
https://en.wikipedia.org/wiki/List_of_International_Organization_for_Standardization_standards,_1–1999
Space: 1889Space: 1889
In the setting, Thomas Edison invented an "ether propeller" which could propel ships through the "luminiferous aether" (the ... Smith, G. E. (January-February 1989). "The Royal Crown Colony of Syrtis Major?: The Imperial Space Age is Here!". Space Gamer/ ... The first series was based loosely, on the Tales from the Ether supplement, introducing the characters, setting, aether, ... Tales from the Ether and More Tales from the Ether, also adapted to Ubiquity rules. GDW released[when?] a range of 25mm ...
https://en.wikipedia.org/wiki/Space:_1889
Paulina PeavyPaulina Peavy
In 1961, the New York Tribune listed an exhibition of her recent paintings in Crown Gallery, 881 Seventh Ave, New York. On her ... Peavy here suggest brightly colored embryos or sleek flying saucers drifting among amniotic fluids or intergalactic ethers." As ...
https://en.wikipedia.org/wiki/Paulina_Peavy
The DragonCrown War CycleThe DragonCrown War Cycle
The Dragon Crown is a magical artifact of great power. In ages long past, the powerful sorcerer Kirun created the crown using ... Alyx retreats into her mind to call for help from the Black Dragon in the ether realm chamber of her secret society. The black ... The Crown heads don't want him spreading word of Chytrine's promise to return. Without his mask, he is without his identity so ... Chytrine wins out in the end with the help of her dragon and takes hold of the Fortress and the two other pieces of the Crown ...
https://en.wikipedia.org/wiki/The_DragonCrown_War_Cycle
CounterionCounterion
Alkali metal cations bound by crown ethers are common lipophilic countercations, as illustrated by [Li(12-crown-4)2]+. Many ...
https://en.wikipedia.org/wiki/Counterion
Japanese-American life after World War IIJapanese-American life after World War II
1987: Charles J. Pedersen wins the Nobel Prize in Chemistry for his methods of synthesizing crown ethers 1988: President Ronald ...
https://en.wikipedia.org/wiki/Japanese-American_life_after_World_War_II
Naphthalenetetracarboxylic dianhydrideNaphthalenetetracarboxylic dianhydride
NDIs are used ins supramolecular chemistry due to their tendency to form charge-transfer complexes with crown ethers, e.g. to ...
https://en.wikipedia.org/wiki/Naphthalenetetracarboxylic_dianhydride
Amateur chemistryAmateur chemistry
The Crown withdrew criminal charges against him on Oct. 13. In the EU, regulations regarding reagent restrictions can be ... These hydrocarbons include hexane, heptane, isooctane (CN 2901 10 for most saturated acyclic hydrocarbons), petroleum ether (CN ...
https://en.wikipedia.org/wiki/Amateur_chemistry
GanyingGanying
The first usage is in a narrative about Crown Prince Dan from the state of Yan (d. 226 BCE) and the future Emperor Qin Shi ... Things belonging to the same category naturally attract each other [類同相召]; things that share the same ethers [qi 氣] naturally ... in the purer ether, when A acts on B, B will not only be moved by it, but will respond actively. Noting that Chinese ganying ... But if inert matter is only the essentially active ether ch'i in an impure state, this kind of action will only be of minor ...
https://en.wikipedia.org/wiki/Ganying
National Collegiate Athletic AssociationNational Collegiate Athletic Association
Kansas City proposed to relocate the NCAA back downtown near the Crown Center complex and would locate the visitors' center in ... vinyl ether)s for coating applications". INFORM: International News on Fats, Oils, and Related Materials. 26 (7): 472-475. doi: ...
https://en.wikipedia.org/wiki/National_Collegiate_Athletic_Association
Ion-Selective Ionic Polymer Metal Composite (IPMC) Actuator Based on Crown Ether Containing Sulfonated Poly(Arylene Ether...Ion-Selective Ionic Polymer Metal Composite (IPMC) Actuator Based on Crown Ether Containing Sulfonated Poly(Arylene Ether...
ionic polymer metal composite (ipmc) actuator based on crown ether containing sulfonated poly(arylene ether ketone). ...
https://www.wetsus.nl/scientific-publications/ion-selective-ionic-polymer-metal-composite-ipmc-actuator-based-on-crown-ether-containing-sulfonated-polyarylene-ether-ketone/
A synthetic enzyme built from DNA flips 107 lipids per second in biological membranes | Nature CommunicationsA synthetic enzyme built from DNA flips 107 lipids per second in biological membranes | Nature Communications
Lipidated Polyaza Crown Ethers as Membrane Anchors for DNA-Controlled Content Mixing between Liposomes. 25 September 2019 ... octyl ether (OPOE), pre-diluted in TE20, in a 7:1 ratio and incubated for 2 min at room temperature. The mixture was then ...
https://www.nature.com/articles/s41467-018-04821-5?error=cookies_not_supported
TOLANESTOLANES
CROWN ETHERS * FUNCTIONAL DYES * COUMARINS * RHODAMINES * AZO DYES * AROMATIC HYDROCARBONS * FLUORESCEINES * CYANINES & ...
https://shop.synthon-chemicals.com/en/LIQUID-CRYSTALS/TOLANES/
IMSEAR at SEARO: Action of K-crown ether on photosystem II electron transport: characterization of the site of action.
Action of K-crown ether on photosystem II electron transport: characterization of the site of action. ... Mohanty P, Seibert M. Action of K-crown ether on photosystem II electron transport: characterization of the site of action. ... We have investigated the inhibitory effect of K-crown (18-crown-6 potassium picrate) on photosystem II (PSII)-enriched membrane ... However, the ether is a leaky inhibitor and may also act as a weak donor when the Mn cluster is not present. Oxygen-production ...
https://imsear.searo.who.int/handle/123456789/28020
Metal-free and metallophthalocyanines appending with eight 12-crown-4 ethers | AVESİSMetal-free and metallophthalocyanines appending with eight 12-crown-4 ethers | AVESİS
Keywords: Crown Ether, Thermal Stability, Phthalocyanine, Synthesis, Phthalonitrile, Microwave, MICROWAVE IRRADIATION, ...
https://avesis.ktu.edu.tr/yayin/21015d0b-f508-4027-aaf6-b73c1da1856c/metal-free-and-metallophthalocyanines-appending-with-eight-12-crown-4-ethers
Synthesis and molecular structures of dibenzo(perhydrotriazino)aza-14- crown-4 ethers - статьяSynthesis and molecular structures of dibenzo(perhydrotriazino)aza-14- crown-4 ethers - статья
... aza-14-crown-4 were obtained in 28-73% yield that included as a subunit a symm-perhydrotriazine ring. This reaction also procee ... 3-oxapentane and ammonium acetate fi rst representatives of the new class of ethers bis(benzo) ... Synthesis and molecular structures of dibenzo(perhydrotriazino)aza-14- crown-4 ethers. By triple condensation of thiourea or ... The molecular structure of one perhydroazacrown ether as a complex with a chloroform molecule was established by XRD analysis ...
https://repository.rudn.ru/ru/records/article/record/2563/
Complexation characteristics of membrane-active crown-ether | Monitoring środowiska przyrodniczegoComplexation characteristics of membrane-active crown-ether | Monitoring środowiska przyrodniczego
Complexation characteristics of membrane-active crown-ether. Complexation characteristics of membrane-active crown-ether ...
https://www.monitoringsrodowiskaprzyrodniczego.pl/complexation-characteristics-of-membrane-active-crown-ether/
Bitocin: Latest News, Photos, Videos on Bitocin - NDTV.COMBitocin: Latest News, Photos, Videos on Bitocin - NDTV.COM
Ether On Bitcoins Heels In Race For Crypto Crown. Business , Reuters , Tuesday September 13, 2022 For years, ether could ... Ether On Bitcoins Heels In Race For Crypto Crown. Business , Reuters , Tuesday September 13, 2022 For years, ether could ...
https://www.ndtv.com/topic/bitocin
Fluorescent Compounds - Crown Ether Series Archives - ChromaTwist - Fluorescent probes for imagingFluorescent Compounds - Crown Ether Series Archives - ChromaTwist - Fluorescent probes for imaging
Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other purposes described in our privacy policy. ...
https://chromatwist.com/product-category/tpox-crown-ether-series/
Sensing by crown-ether-based molecular junctions Mini-Conference - Research Portal | Lancaster University
Sensing by crown-ether-based molecular junctions Mini-Conference. Activity: Talk or presentation types › Invited talk ...
https://www.research.lancs.ac.uk/portal/en/activities/sensing-by-crownetherbased-molecular-junctions-miniconference
Second-sphere co-ordination of neutral and cationic transition metal complexes by crown ethers - Stoddart...
Second-sphere co-ordination of neutral and cationic transition metal complexes by crown ethers. Second-sphere co-ordination of ... neutral and cationic transition metal complexes by crown ethers, (H. M. Colquhoun, J. F. Stoddart), J. Chem. Soc., Chem. Commun ...
https://stoddart.northwestern.edu/publications/second-sphere-co-ordination-of-neutral-and-cationic-transition-metal-complexes-by-crown-ethers/
Ethereum blockchain completes major software upgrade - Tech - DAWN.COMEthereum blockchain completes major software upgrade - Tech - DAWN.COM
Read: Cryptoverse: Ether snaps at bitcoins heels in race for crypto crown ... The overhaul has changed how transactions on the Ethereum blockchain occur and how ether tokens, the second-largest crypto coin ... The cryptocurrency ether was little changed at $1,633 as of 0713 GMT. ... Representation of Ethereum, with its native cryptocurrency ether, is seen in this illustration. - Reuters/File ...
https://www.dawn.com/news/1710230
Multivalent Crown Ether Receptors Enable Allosteric Regulation of Anion Exchange in an Fe4L6 Tetrahedron •...Multivalent Crown Ether Receptors Enable Allosteric Regulation of Anion Exchange in an Fe4L6 Tetrahedron •...
Multivalent Crown Ether Receptors Enable Allosteric Regulation of Anion Exchange in an Fe4L6 Tetrahedron. L.K.S. von Krbek, D.A ... Multivalent Crown Ether Receptors Enable Allosteric Regulation of Anion Exchange in an Fe4L6 Tetrahedron ... Multivalent Crown Ether Receptors Enable Allosteric Regulation of Anion Exchange in an Fe4L6 Tetrahedron ... The cage features three flexible 18-crown-6 receptors at each of its FeII vertices, facilitating strong tritopic interactions ...
https://www.sfb765.de/publikationen/a01054/index.html
Capillary electrophoretic separation and computational modeling of inclusion complexes of β-cyclodextrin and 18-crown-6 ether...
Capillary electrophoretic separation and computational modeling of inclusion complexes of β-cyclodextrin and 18-crown-6 ether ... Capillary electrophoretic separation and computational modeling of inclusion complexes of β-cyclodextrin and 18-crown-6 ether ...
https://squ.pure.elsevier.com/en/publications/capillary-electrophoretic-separation-and-computational-modeling-o/fingerprints/
Ligand - New World EncyclopediaLigand - New World Encyclopedia
Crown ethers. neutral. primarily for alkali and alkaline earth metal cations 2,2,2-crypt. hexadentate. primarily for alkali and ...
https://www.newworldencyclopedia.org/entry/Ligand
DataSheet1 Polyacrylonitrile/Crown Ether Composite Nanofibres With High Efficiency for Adsorbing Li(I): Experiments and...
Polyacrylonitrile/Crown Ether Composite Nanofibres With High Efficiency for Adsorbing Li(I): Experiments and Theoretical ... The results indicated that in crown ether, O in epoxy groups was coordinated with Li(I) to form Li-O and four O atoms in the ... The nanofibres containing crown ether synthesised by chemical grafting and electrospinning have the potential to be used in ... DataSheet1_Polyacrylonitrile/Crown Ether Composite Nanofibres With High Efficiency for Adsorbing Li(I): Experiments and ...
https://frontiersin.figshare.com/articles/dataset/DataSheet1_Polyacrylonitrile_Crown_Ether_Composite_Nanofibres_With_High_Efficiency_for_Adsorbing_Li_I_Experiments_and_Theoretical_Calculations_docx/17098697/1
Special issue in honour of Seth Marder HomeSpecial issue in honour of Seth Marder Home
Enhanced emission by stacking of crown ether side chains in a 2D covalent organic framework Liu Yuan, Jun Zhu, Shaofei Wu and ... 2D hydrazone-linking covalent organic frameworks with differently sized crown ether side chains were synthesized, and 20-fold ... improved emission was achieved by tuning the size of the crown ethers. ...
https://pubs.rsc.org/en/journals/articlecollectionlanding?sercode=mh&themeid=191cf45b-09d0-478e-96bb-47607d3526d3
Fluorine-19 MRI at 21.1 T: enhanced spin-lattice relaxation of perfluoro-15-crown-5-ether and sensitivity as demonstrated in ex...Fluorine-19 MRI at 21.1 T: enhanced spin-lattice relaxation of perfluoro-15-crown-5-ether and sensitivity as demonstrated in ex...
Fluorine-19 MRI at 21.1 T: enhanced spin-lattice relaxation of perfluoro-15-crown-5-ether and sensitivity as demonstrated in ex ... Fluorine-19 MRI at 21.1 T: enhanced spin-lattice relaxation of perfluoro-15-crown-5-ether and sensitivity as demonstrated in ex ... We studied perfluoro-15-crown-5-ether (PFCE) at both field strengths (B(0)), as a pure compound, in the form of nanoparticles ( ...
http://edoc.mdc-berlin.de/17877/
Metal-ion sensing fluorophores with large two-photon absorption cross sections: Aza-crown ether substituted donor-acceptor...
Metal-ion sensing fluorophores with large two-photon absorption cross sections: Aza-crown ether substituted donor-acceptor- ... Aza-crown ether substituted donor-acceptor-donor distyrylbenzenes. Together they form a unique fingerprint. ...
https://experts.arizona.edu/en/publications/metal-ion-sensing-fluorophores-with-large-two-photon-absorption-c/fingerprints/?sortBy=alphabetically
CAS-14187-32-7, Crown Ether / Dibenzo-18-Crown-6 (Dibenzo 18-Crown-6) for Synthesis Manufacturers, Suppliers & Exporters in...CAS-14187-32-7, Crown Ether / Dibenzo-18-Crown-6 (Dibenzo 18-Crown-6) for Synthesis Manufacturers, Suppliers & Exporters in...
Dibenzo-18-Crown-6 (Dibenzo 18-Crown-6) for Synthesis manufacturer in India, Crown Ether / Dibenzo-18-Crown-6 (Dibenzo 18-Crown ... Crown Ether / Dibenzo-18-Crown-6 (Dibenzo 18-Crown-6) for Synthesis MSDS (material safety data sheet) or SDS, COA and Specs.. * ... Crown Ether / Dibenzo-18-Crown-6 (Dibenzo 18-Crown-6) for Synthesis , 14187-32-7. Product Code ... Leading Manufacturer of Crown Ether / Dibenzo-18-Crown-6 (Dibenzo 18-Crown-6) for Synthesis , 14187-32-7 ...
https://www.cdhfinechemical.com/crown-ether-dibenzo-18-crown-6-dibenzo-18-crown-6
Proceedings in RadiochemistryProceedings in Radiochemistry
Lead isotopes were fractionated by the liquid-liquid extraction technique between an aqueous phase and a crown ether. After ... Palladium isotopes were fractionated by the solvent extraction technique with a crown ether. After purification by ion-exchange ... Nuclear field shift effect of lead in ligand exchange reaction using a crown ether. ...
https://www.degruyter.com/journal/key/rcpr/html?lang=de
dibenzo-27-crown-9 | Semantic Scholardibenzo-27-crown-9 | Semantic Scholar
PVC membrane ion-selective electrodes based on dibenzo-27-crown-9 (DB27C9) and guanidinium tetraphenylborate (GuTPB) are… ... Guanidinium ion-selective electrodes based on dibenzo-27-crown-9 and tetraphenylborate. ...
https://www.semanticscholar.org/topic/dibenzo-27-crown-9/1285615
Science Clips - Volume 13, Issue 22, June 29, 2021Science Clips - Volume 13, Issue 22, June 29, 2021
The existing analytical method for urine Sr-90 analysis using crown ethers is laborious and involves possible exposure to ... Of the PBDEs quantified, only decabromodiphenyl ether (BDE-209) pre- and post-fire serum concentrations were statistically ... ethers (PBDEs), during structure fires. This study utilized biological monitoring to characterize FR exposures in 36 ...
https://www.cdc.gov/library/sciclips/issues/v13issue22.html
Sciencemadness Discussion Board - Sodium! - Powered by XMB 1.9.11Sciencemadness Discussion Board - Sodium! - Powered by XMB 1.9.11
Crown ethers?. Sorry to revive an old thread, butIve been thinking a bit. If I annoy you, Ill stop.. Crown ethers are cyclic ... aprotic solvent with crown ether at the cathode.. I couldnt find anything on their electrolysis though.. Crown ethers are ... ethers that can form complexes with cations and so act as PTCs.. I was thinking water at the anode, ...
https://www.sciencemadness.org/whisper/viewthread.php?tid=2103&page=16
The Stromata, or Miscellanies - Book V - Clement of AlexandriaThe Stromata, or Miscellanies - Book V - Clement of Alexandria
Whom Ether crowns." .... By the expression "Sire of our Mother" (metropator) he not only intimates creation out of nothing, but ... "Ether is Zeus, Zeus earth, and Zeus the heaven;. The universe is Zeus, and all above.". I am aware that Plato assents to ... "Ruler of Ether, Hades, Sea, and Land,. Who with Thy bolts Olympus strong-built home. Dost shake. Whom demons dread, and whom ... In Ether thou shall know, and the effects,. All viewless, of the sacred Suns clear torch. And whence produced. The round-eyed ...
https://mb-soft.com/believe/txv/clemenaf.htm
CN100366591C - 一种拟除虫菊酯化合物中间体的制备方
150000003983 crown ethers Chemical class 0.000 description 1 * 238000002425 crystallisation Methods 0.000 description 1 ... 150000002170 ethers Chemical class 0.000 claims description 13 * 229910052751 metal Inorganic materials 0.000 claims ... RTZKZFJDLAIYFH-UHFFFAOYSA-N diethyl ether Chemical compound data:image/svg+xml;base64, ... LCGLNKUTAGEVQW-UHFFFAOYSA-N dimethyl ether Chemical compound data:image/svg+xml;base64, ...
https://patents.google.com/patent/CN100366591C/zh
Attending to the body during difficult times | The University of Edinburgh
Chakra 7, crown chakra, ether element, the colour while or lilac We move our hands up to the crown chakra or fontanelle - that ... The colour is blue, and the element is ether which is the element for the final 3 chakras in the diagram above. Ether is the ... We connect through ether to the sacred and the spiritual. In the fifth chakra we open to being able to sound the sacred through ... Chakra 5, throat chakra, ether element, the colour blue We move our hands up to the throat area. This is the centre of ...
https://www.ed.ac.uk/chaplaincy/blogs-podcasts-and-reflections/for-times-like-these/attending-to-the-body-during-difficult-times
Cas 22148-20-5｜Piperidine,1-(4-bromophenyl)-｜lookchemCas 22148-20-5｜Piperidine,1-(4-bromophenyl)-｜lookchem
With tol-BINAP; 18-crown-6 ether; sodium t-butanolate; tris(dibenzylideneacetone)dipalladium (0); In tetrahydrofuran; for 13h; ...
https://www.lookchem.com/CASDataBase_22148-20-5.htm
Tube Caps Manufacturers, Suppliers, Dealers & PricesTube Caps Manufacturers, Suppliers, Dealers & Prices
18-CROWN-6-ETHER 98% For Synthesis. Get latest price. 1-(3-Chlorophenyl)-4-(3-chloropropyl) piperazine hydrochloride. Get ...
https://www.tradeindia.com/manufacturers/tube-caps.html
ComplexesCompoundsSynthesisChiralCryptandsCationsDibenzoBitcoinElectronsCharacterizationAtomsChakraMolecularCentresTokensArtificialComplexStructurePotentialStudySpecificSeveral crown ethersMacrocyclesSynthesisEthylene GlycoIonsMacrocyclicDerivativesAlcoholsCationAlkaliSupramolecular chemistryIonophoresAbstractCalixarenesMoleculesDiphenylAlkylComplexationHydrocarbonsPotassiumSolventSubstitutionOrganicDibenzo-30-crown-10SensorsHydrogenPotentiometricElectrodesArchitecturesReactionsCompoundsMoietiesPolymersOxygenTokenAcidQueen'sAnalyses
Complexes3
  • We have investigated the inhibitory effect of K-crown (18-crown-6 potassium picrate) on photosystem II (PSII)-enriched membrane fragments and O2-evolving core complexes. (who.int)
  • The first examples of superstructures formed by attractive intermolecular forces were complexes of crown ethers, cryptands, and spherands. (beilstein-journals.org)
  • Complexes of 18-crown-6 ether (18C6) with four protonated amino acids (AAs) are examined using infrared multiple photon dissociation (IRMPD) action spectroscopy utilizing light generated by the infrared free electron laser at the Centre Laser Infrarouge d'Orsay (CLIO). (nsf.gov)
Compounds4
  • A large number of crown ether compounds have been developed. (dojindo.com)
  • Bicyclic crown compounds. (bvsalud.org)
  • In response to a confidential employee request, a study was conducted on potential occupational exposures to several compounds as well as an evaluation of a possible excess of cancer deaths among employees at Crown, Cork, and Seal (SIC-3411) in Cincinnati, Ohio. (cdc.gov)
  • Active Ingredients: Pyrethrins-0.05%/Piperonyl Butoxide*-0.50%/ Permethrin**-0.10%/Inert Ingredients-99.35%/Total=100.00%// *equivalent To 0.4%(Butylcarbityl)(6-Propylpiperonyl)ether 0.1%related Compounds/**(3-Phenoxyphenyl)(22 Dichloroethenyl). (equineexchangestore.com)
Synthesis2
  • Synthesis of biologically active adamantane-substituted diaza-crowns. (irb.hr)
  • But in fact, you get the same However, 18-crown-6 is expensive when compared to the linear Both caprolactam and N-acetylcaprolactam are slightly toxic synthesis has been reported8. (migdaliadenis.com)
Chiral4
  • The complexing properties of a chiral 18-crown-6 derivative incorporating a 2,5-anhydro-d-mannitol residue. (northwestern.edu)
  • The complexing properties of chiral crown ethers incorporating 1,3:4,6-di-o-methylene-d-mannitol residues. (northwestern.edu)
  • It has already been reported how the enantiomeric recognition abilities of chiral pyridino-18-crown-6 ethers change upon modification of several of their structural features. (mdpi.com)
  • To gain information about this, the enantiomeric discrimination of a set of chiral pyridino-18-crown-6 ethers having different substituents at position 4 of the pyridine ring was examined by isothermal titration calorimetry. (mdpi.com)
Cryptands1
  • After Charles Pedersen discovered crown ethers, molecules that can capture certain metallic atoms, Jean-Marie Lehn found related molecules in 1969 that he called cryptands. (nobelprize.org)
Cations1
  • The cage features three flexible 18-crown-6 receptors at each of its FeII vertices, facilitating strong tritopic interactions with tris(ammonium) cations to 'cap' the vertices of the tetrahedron. (sfb765.de)
Dibenzo1
  • Guanidinium ion-selective electrodes based on dibenzo-27-crown-9 and tetraphenylborate. (semanticscholar.org)
Bitcoin2
  • For years, ether could barely dream of challenging its big brother bitcoin. (ndtv.com)
  • The overhaul has changed how transactions on the Ethereum blockchain occur and how ether tokens, the second-largest crypto coin after bitcoin, are created. (dawn.com)
Electrons1
  • Fluorescence studies on active and Tris-treated samples showed that K-crown does not prevent artificial donors from transferring electrons to PSII but like DCMU inhibits on the acceptor side after QA, the primary quinone acceptor. (who.int)
Characterization2
  • IMSEAR at SEARO: Action of K-crown ether on photosystem II electron transport: characterization of the site of action. (who.int)
  • Mohanty P, Seibert M. Action of K-crown ether on photosystem II electron transport: characterization of the site of action. (who.int)
Atoms2
  • The results indicated that in crown ether, O in epoxy groups was coordinated with Li(I) to form Li-O and four O atoms in the epoxy groups were used as electron donors. (figshare.com)
  • Macropolycyclic poly-aza-polyethers that are ether chains linked by three-coordinate nitrogen atoms. (bvsalud.org)
Chakra2
  • This practice involves giving ourselves an experience of the 5 elements in our bodies (earth, water, fire, air, and ether) Through simple tai chi movements connected with chakra energy centres in our bodies (see image below ) we are able to address and calm any difficult feelings, thoughts, and body sensations. (ed.ac.uk)
  • or a moment of epiphany in your subtle and elegant short story (crown chakra all the way! (minalhajratwala.com)
Molecular1
  • Sensing by crown-ether-based molecular junction. (lancs.ac.uk)
Centres1
  • Oxygen-evolution studies demonstrated that the ether works by inactivating the centres and not by interfering with antenna function or energy transfer to the reaction centre. (who.int)
Tokens2
  • Ethereum has moved from a "proof of work" system, in which energy-hungry computers validate transactions by solving complex maths problems, to a "proof of stake" system, where individuals and companies act as validators, using their ether as collateral, to win newly created tokens. (dawn.com)
  • Life Insurance , Scion of Opulence , Gadrak, the Crown-Scourge and Pitiless Plunderer both net you tokens for sacrificing creatures (your Commander's whole thing! (tappedout.net)
Artificial1
  • Crown ether-functionalized complex emulsions as an artificial adaptive material platform. (mpg.de)
Complex1
  • K-crown does not disrupt binding of the extrinsic proteins associated with O2 evolution nor complex with bound Ca2+ or Cl- cofactors, but rather it directly inhibits electron transfer after the tetrameric Mn cluster. (who.int)
Structure1
  • Antitumor potential of crown ethers: structure activity relationships, cell cycle disturbances and cell death studies of a series of ionophores. (irb.hr)
Potential2
  • The nanofibres containing crown ether synthesised by chemical grafting and electrospinning have the potential to be used in extracting lithium resources from the brine in salt lakes. (figshare.com)
  • The ethers, or higher vibrational fields of consciousness, are filled with vast potential just waiting to be molded into your greatest dreams and desires. (spiritlibrary.com)
Study2
  • This study examines the sensitivity gain of (19)F MR that can be practically achieved when moving from 9.4 to 21.1 T. MATERIALS AND METHODS: We studied perfluoro-15-crown-5-ether (PFCE) at both field strengths (B(0)), as a pure compound, in the form of nanoparticles (NP) as employed to study inflammation in vivo, as well as in inflamed tissue. (mdc-berlin.de)
  • Water induces the same crown shapes as Li + or Na + in 15-crown-5 ether: a broadband rotational study. (bvsalud.org)
Specific1
  • By using chemical grafting and electrospinning techniques, nanofibres containing crown ether were developed for adsorbing Li(I) from the brine in salt lakes, so as to selectively adsorb Li(I) on the premise of retaining specific vacancies of epoxy groups in crown ether. (figshare.com)
Several crown ethers2
  • Ultraviolet photoelectron spectroscopy has been used to measure the valence-shell ionization potentials of several crown ethers and other macrocyclic ligands. (semanticscholar.org)
  • Acid-catalyzed dehydration of HMF yields OMBF (5,5'-oxydimethylenebis(2- furfural)), an intermediate in the synthesis of several crown ethers (Larousse et al . (nih.gov)
Macrocycles1
  • Direct functionalization routes can reduce synthetic effort, allow the later modification of crown ether-based architectures, and disclose new ways to exploit these versatile macrocycles in contemporary supramolecular science and technology. (unibo.it)
Synthesis9
  • In this review article, we have focused on the synthesis of heterocycles using crown ethers. (eurekaselect.com)
  • 3. Synthesis, Biological Evaluation, and Molecular Modeling of Aza-Crown Ethers. (nih.gov)
  • His research interests include synthesis, cation bonding and fluorescence properties of crown ethers. (pace.edu)
  • Synthesis and characterization of heterocyclic molecules and their crown ethers derivatives' cation bonding and fluorescence properties. (pace.edu)
  • HMF is used in the synthesis of dialdehydes, glycols, ethers, amino alcohols and acetals. (nih.gov)
  • While his recent work involves dealing with the synthesis and molecular recognition properties of glycosylated crown ethers, sugar-calixarenes, glycodendrimers, and multivalentiminosugar architectures. (benthamscience.com)
  • Allied to special 2D n.m.r. techniques such as COSY, NOESY, ROESY, and EXSY and the use of multiple quantum experiments these provide remarkable detail on the structures, solution dynamics and electron exchange behaviour of species as diverse as crown ether analogues for the sequestration of heavy metals, catalysts for asymmetric synthesis, and metallo-proteins with important electron transfer functions. (ncl.ac.uk)
  • Monoethylene glycol dimethyl ether is an inert solvent especially well suited for API synthesis. (clariant.com)
  • This paper reports a new continuous-flow synthesis of chiral and achiral pyridino-18-crown-6 ethers. (akjournals.com)
Ethylene Glyco1
  • Effects of the Rat Testis of Single Inhalation Exposures to Ethylene Glycol Monoalkyl Ethers, in Particular Ethylene Glycol Monomethyl Ether (EGME). (epa.gov)
Ions6
  • Thus, responses of the PVC membrane prepared with new bis(crown ether)s and Fluka ionophore V (crown ether) base to various cations include lead, alkali and alkaline earth metal ions were investigated for their use as a lead sensor. (elsevier.com)
  • The geometric and electronic structures of cold host-guest complex ions of crown ethers (CEs) in the gas phase have been investigated by ultraviolet (UV) fragmentation spectroscopy. (hiroshima-u.ac.jp)
  • The researchers fitted each chunk with crown ethers, chemical arms that twist the helix subtly when they capture the ions. (newscientist.com)
  • Partitioning of Cs+ and Na+ ions by dibenzo-18-crown-6 ionophore in biphasic aqueous systems of octanol and ionic liquid" , Radiochim. (iitg.ac.in)
  • Integrative self-sorting of two divalent compounds, one axle bearing two different secondary ammonium ions and a crown ether dimer incorporating [21]crown-7 and [24]crown-8. (fu-berlin.de)
  • Through N-C=O-metal interactions, the amide group in many hosts directs the specificity of the host toward softer alkaline earth cations, whereas ether macrocyclic ionophores show high selectivity in complex formation with alkali metal ions [22-24]. (samipubco.com)
Macrocyclic5
  • Crown ethers are macrocyclic hosts that can complex a wide range of inorganic and organic cations as well as neutral guest species. (unibo.it)
  • Although functionalised crown ethers are normally synthesised by templated macrocyclisation using appropriately substituted starting materials, the direct addition of functional groups onto a pre-formed macrocyclic framework is a valuable yet underexplored alternative. (unibo.it)
  • Macrocyclic Chelates Bridged by a Diaza-Crown Ether: Towards Multinuclear Bimodal Molecular Imaging Probes. (mpg.de)
  • In 1987, DuPont chemist Charles J. Pedersen - who worked in the lab - shared the 1987 Nobel Prize in Chemistry with Donald J. Cram and Jean-Marie Lehn for work in synthesizing macrocyclic polyethers, also known as crown ethers. (canplastics.com)
  • Due to their high ability to selectively and effectively interact with various types of transition and heavy metals, there is a greater tendency to produce new crown ethers, including benzo- substituted macrocyclic diamides. (samipubco.com)
Derivatives1
  • We have been specialized in developing and manufacturing benzene substitution (like styrene series), heterocyclic substitution (like crown ether series), boronic acid derivatives, silane series and electronic chemicals, as well as accumulating rich experience. (gmchemic.com)
Alcohols2
  • In the current generation, this method has shown promise in mono- and disubstituted olefins in the presence of amides, carbamates, ethers, alcohols, pyridines, and basic amines. (jawschem.com)
  • In contrast to alcohols, ethers are fairly unreactive except to very strong acids such as HI or HBr. (ucalgary.ca)
Cation2
  • The presence of a small cation and ionophore leads to subtle changes in behaviour compared with their larger alkali metal analogues and in the hydrated salts water bridges form links between the crown-encapsulated cations and neighbouring TCNQ stacks. (soton.ac.uk)
  • Crown ethers are common building blocks in supramolecular chemistry and are frequently applied as cation sensors or as subunits in synthetic molecular machines. (jyu.fi)
Alkali2
  • They were converted to the corresponding long chain N-alkyl monoaza crown ethers by treatment with p-toluene-sulfonyl chlorides in the presence of alkali metal hydroxides in dioxane. (ncku.edu.tw)
  • Alkali metal ion partitioning with calix[4]arene-benzo-crown 6 ionophore in acidic medium: insights from experiments, statistical mechanical framework, and molecular dynamics simulations" , J. Phys. (iitg.ac.in)
Supramolecular chemistry1
  • From the very hour of its birth - Pedersen's discovery of crown ethers - supramolecular chemistry has been dealing with molecular containers. (chemistryworld.com)
Ionophores2
  • The ionophorous properties of these crown ethers with respect to the transport of lithium, sodium, and potassium picrates across a bulk liquid chloroform membrane were measured and have been compared to those of crown ethers already used as ionophores. (rsc.org)
  • The amide group, which is naturally used in a variety of antibiotic ionophores [7-11], has found a special place in the design of receptors because (i) it shows the character of a double bond (O or N and NH), (ii) it has a higher negative charge on oxygen than the ether and ester groups and (iii) has a geometric strength [12,13]. (samipubco.com)
Abstract2
  • abstract = "A flavin analogue bearing a crown ring as a recognition site was synthesized. (elsevier.com)
  • abstract = "Photoresponsive crown ethers (3) having an intra-annular azo substituent have been synthesized. (elsevier.com)
Calixarenes1
  • Compiles the targets relating to practical fabrics and offers distinctive studies of basics, novel construction equipment, and frontiers of practical fabrics, together with metalic oxides, undertaking polymers, carbon nanotubes, discotic liquid crystalline dimers, calixarenes, crown ethers, chitosan and graphene. (cashloansvc.com)
Molecules1
  • The prize is named for the 1987 Nobel Prize in Chemistry winners Donald Cram, Jean-Marie Lehn, and Charles Pedersen, who first demonstrated the properties and usefulness of "crown ethers," cyclical molecules of carbon, hydrogen, and oxygen. (iu.edu)
Diphenyl2
  • Biodegradation of Diphenyl Ethers by a Copper-Resistant Mutant of 'Erwinia' sp. (epa.gov)
  • Exposure Assessment of Polybrominated Diphenyl Ethers. (epa.gov)
Alkyl2
  • A number of alkyl-substituted crown ethers of the type 2-R-12-crown-4, 2-R-15-crown-5, and 2-R-18-crown-6 (R = Me, Et, octyl, decyl, tetradecyl, icosyl, or Ph) have been prepared in relatively good yields by a novel synthetic route employing the metal-ion template effect. (rsc.org)
  • Substitution of alkyl and phenyl groups on the crown ethers, making them more lipophilic, does not seem to assist the transport of Na + and K + as their picrate salts, but rather appears to make the ionophore more susceptible to remain in the chloroform phase, as the chain length increases, and thereby leads to a reduction in transport. (rsc.org)
Complexation1
  • The data are discussed in terms of quality of potentiometric response related to conformational phenomena of crown ethers in their complexation with these dications.Good ion-selective electrode properties were characteristic of the 4,4′-DPy systems based on bis(metaphenylene-32-crown-10)(BMP32C10), bis(metaphenylene-38-crown-12)(BMP38C12), bis(paraphenylene-34-crown-10)(BPP34C10), bis(paraphenylene-37-crown-11)(BPP37C11) and dinaphthalene-36-crown-10 (DN36C10). (elsevier.com)
Hydrocarbons1
  • 1. Hydrocarbons and Ethers. (epa.gov)
Potassium1
  • Explosive reaction with crown ethers or potassium hydroxide. (nih.gov)
Solvent2
  • Electrodes based on PVC matrix membranes containing one of six crown ethers with 2-nitrophenyl octyl ether or dibutyl phthalate solvent mediator have been studied for their potentiometric response to 4,4′-dipyridyl (DPy), diquat (DQT) and paraquat (PQT) dications. (elsevier.com)
  • Polyglycol DME 500 can be used as an inert solvent and plasticizer in paints & coatings as well as reaction solvent or as PTC as a cost-effective alternative to crown-ethers. (clariant.com)
Substitution1
  • The general approach for the introduction of moieties on aliphatic crown ethers involves a radical mediated cross dehydrogenative coupling initiated either by photochemical or thermal/chemical activation, while aromatic crown ethers are commonly derivatised via electrophilic aromatic substitution. (unibo.it)
Organic1
  • Our group recently discovered a new class of metal chelating agents that have been named metallacrowns based on the structural similarity of these materials to organic crown ethers. (searlescholars.net)
Dibenzo-30-crown-101
  • A sixth electrode, based on dibenzo-30-crown-10 (DB30C10), showed similar calibration behaviour towards 4,4′-DPy but was much less selective. (elsevier.com)
Sensors2
  • Studies on crown ether based potentiometric sensors for 4,4? (elsevier.com)
  • Dive into the research topics of 'Studies on crown ether based potentiometric sensors for 4,4? (elsevier.com)
Hydrogen1
  • In 1895, the use of pyrozone mouth rinsing (25% hydrogen peroxide and ether at a 5:1 ratio) was found to cause bleaching of vital teeth as a side effect. (bvsalud.org)
Potentiometric1
  • The polymeric liquid membrane based on trans- 18-crown-6 ether exhibits the best overall potentiometric performances as a lead-selective electrode in terms of a wide linear dynamic range (between 10 -6 and 10 -2 M, Pb 2+ ), excellent detection limit (less than 10 -6 M) and good durability within limited error. (elsevier.com)
Electrodes1
  • Lead-selective PVC membrane electrodes based on newly synthesized bis(crown ether)s containing 18-crown-6 moiety was prepared using standard PVC membrane composition. (elsevier.com)
Architectures1
  • The first part of this paper discusses the molecular design of selected examples of structural units containing taper shaped exo-receptors and various crown ether, oligooxyethylenic and H-bonding based endo-receptors, which self-assemble into cylindrical channel-like architectures via principles resembling those of tobacco mosaic virus TMV. (dtic.mil)
Reactions1
  • The setup presented here is suitable for the preparation of different ethers by Williamsontype syntheses in continuous-flow reactions. (akjournals.com)
Compounds2
  • Bicyclic crown compounds. (nih.gov)
  • In response to a confidential employee request, a study was conducted on potential occupational exposures to several compounds as well as an evaluation of a possible excess of cancer deaths among employees at Crown, Cork, and Seal (SIC-3411) in Cincinnati, Ohio. (cdc.gov)
Moieties1
Polymers1
  • Supramolecular Organogel Based on Crown Ether and Secondary Ammoniumion Functionalized Glycidyl Triazole Polymers. (mpg.de)
Oxygen1
  • For example, perfluorocarbons (PFC) such as perfluoro-15-crown-5 (15C5) have been used to measure oxygen tensions in tissues and tumors ( 8 ) and to label dendritic cells ( 9 ). (nih.gov)
Token3
  • Souvenir tokens representing cryptocurrency Bitcoin and the Ethereum network, with its native token ether, plunge into water in this illustration taken May 17, 2022. (tadalafilreal.com)
  • Name of the token: Crowns, Eth, USD Tether. (seascape.network)
  • For example let's say we create our game in Cocos Creator, and our staking token is Crowns. (seascape.network)
Acid1
  • Acute Oral Toxicity Study with Petroleum Distillates, Aromatic Acid, Aromatic Compound, and Glycol Ethers. (epa.gov)
Queen's1
Analyses1
  • L' = 15-crown-5, 18-crown-6) were synthesized and their structures were revealed by X-ray analyses. (chemeurope.com)
Applications of Fluorescent Sensor Based on 1H-pyrazolo[3,4-b]quinoline in Analytical Chemistry | SpringerLink
Applications of Fluorescent Sensor Based on 1H-pyrazolo[3,4-b]quinoline in Analytical Chemistry | SpringerLink (link.springer.com)
Are Postboxes Cultural Heritage? An Examination of the Debates on British Postboxes in Post-Colonial Hong Kong
Are Postboxes Cultural Heritage? An Examination of the Debates on British Postboxes in Post-Colonial Hong Kong (escholarship.org)
Jean-Marie Lehn
Jean-Marie Lehn (nobelprize.org)
Symmetry | November 2020 - Browse Articles
Symmetry | November 2020 - Browse Articles (mdpi.com)
Selected publications - Ruđer Bošković Institute
Selected publications - Ruđer Bošković Institute (irb.hr)
Preparation of sodium and bisarenechromium fullendes containin...
Preparation of sodium and bisarenechromium fullendes containin... (mysciencework.com)
BJOC - BJOC - Superstructures with cyclodextrins: Chemistry and applications IV
BJOC - BJOC - Superstructures with cyclodextrins: Chemistry and applications IV (beilstein-journals.org)
HeteroCycles
HeteroCycles (heterocycles.jp)
Ben-Gurion University of the Negev - Research output - Ben-Gurion University Research Portal
Ben-Gurion University of the Negev - Research output - Ben-Gurion University Research Portal (cris.bgu.ac.il)
Symposium Session
Symposium Session (mrs.org)
Find Research outputs - Yonsei University
Find Research outputs - Yonsei University (yonsei.pure.elsevier.com)
The Greatest French Organic Chemists
The Greatest French Organic Chemists (thefamouspeople.com)
Publications | Max Planck Institute for Multidisciplinary Sciences
Publications | Max Planck Institute for Multidisciplinary Sciences (mpinat.mpg.de)
Regius Professor of Chemistry, School of Chemistry ... · 2015 New method of Hybrid Inorganic-Peptide Synthesis (JACS) 2014...
Regius Professor of Chemistry, School of Chemistry ... · 2015 New method of Hybrid Inorganic-Peptide Synthesis (JACS) 2014... (fdocuments.in)
Patents - Kataliz və Qeyri-üzvi Kimya İnstitutu
Patents - Kataliz və Qeyri-üzvi Kimya İnstitutu (kqkiamea.az)
Chemical Papers
Chemical Papers (chempap.org)
Volume XI: Selected Facebook Updates And Tweets Of Chandran K C On Scientific Homeopathy - REDEFINING HOMEOPATHY
Volume XI: Selected Facebook Updates And Tweets Of Chandran K C On Scientific Homeopathy - REDEFINING HOMEOPATHY (redefininghomeopathy.com)
Search
Search (ukzn-dspace.ukzn.ac.za)
Aminoethyl Pune Manufacturers, Suppliers, Exporters, Importers in India
Aminoethyl Pune Manufacturers, Suppliers, Exporters, Importers in India (needsinfo.com)
Synteza spaleniowa materiałów nanostrukturalnych | Physical sciences \ Physics \ Experimental physics Chemical sciences \...
Synteza spaleniowa materiałów nanostrukturalnych | Physical sciences \ Physics \ Experimental physics Chemical sciences \... (wuw.pl)
BIOELECTROCHEMISTRY - Czasopismo - MOST Wiedzy
BIOELECTROCHEMISTRY - Czasopismo - MOST Wiedzy (mostwiedzy.pl)
PHOTOPHYSICAL, ELECTROCHEMICAL, AND CATALYTIC STUDIES OF ANTHRAQUINONE by Anwar Hussain
"PHOTOPHYSICAL, ELECTROCHEMICAL, AND CATALYTIC STUDIES OF ANTHRAQUINONE" by Anwar Hussain (red.library.usd.edu)
Publications
Publications (theory.rutgers.edu)
Polymer Vesicles - Wiley Online Library - PDFHALL.COM
Polymer Vesicles - Wiley Online Library - PDFHALL.COM (pdfhall.com)
Publications
Publications (django.seagrid.org)
Silver Wire Wrapped Chakra Healing Pendant
Silver Wire Wrapped Chakra Healing Pendant (charmsoflight.com)
Sunday meditation
Sunday meditation (llresearch.org)
Total Synthesis: a Crowning Achievement in Organic Chemistry - DocsLib
Total Synthesis: a Crowning Achievement in Organic Chemistry - DocsLib (docslib.org)