About the Authors. Preface to the First Edition.. Preface to the Second Edition.. Acknowledgements.. 1 Concepts.. 1.1 Definition and Development of Supramolecular Chemistry.. 1.2 Classification of Supramolecular Host-Guest Compounds.. 1.3 Receptors, Coordination and the Lock and Key Analogy.. 1.4 Binding Constants.. 1.5 Cooperativity and the Chelate Effect.. 1.6 Preorganisation and Complementarity.. 1.7 Thermodynamic and Kinetic Selectivity, and Discrimination.. 1.8 Nature of Supramolecular Interactions.. 1.9 Solvation and Hydrophobic Effects.. 1.10 Supramolecular Concepts and Design.. 2 The Supramolecular Chemistry of Life.. 2.1 Biological Inspiration for Supramolecular Chemistry.. 2.2 Alkali Metal Cations in Biochemistry.. 2.3 Porphyrins and Tetrapyrrole Macrocycles.. 2.4 Supramolecular Features of Plant Photosynthesis.. 2.5 Uptake and Transport of Oxygen by Haemoglobin.. 2.6 Enzymes and Coenzymes.. 2.7 Neurotransmitters and Hormones.. 2.8 Semiochemistry in the Natural World.. 2.9 DNA.. 2.10 ...
This market research report examines the foreign trade of Ukraine and its perspectives on the global market for acyclic hydrocarbons. The report
Organic synthesis, supramolecular chemistry, chemical biology and more. |br/|On average get a first decision in 15 days for Communications and 22 days for Papers.|br/|
This themed collection published in Organic & Biomolecular Chemistry (OBC) highlights some of the latest exciting research in Supramolecular Chemistry in Water. The issue is Guest Edited by Professors Tony Davis (University of Bristol, United Kingdom), Antonella Dalla Cort (Università La Sapienza, Italy), and Stefan Kubik (Technische Universität Kaiserslautern, Germany). New articles will be added to this collection as they are published.. A convenient short url for this collection isrsc.li/ob-h2o-supramol-chem. ...
Supramolecular chemistry. Selectivity, complementarity and co-operativity. Non-covalent interactions: hydrogen bonds, C H pi and pi...pi interactions, hydrophobic, electrostatic and halogen interactions etc. Molecules and ions with a cavities and other types of receptors which can form host-guest complexes Selfassembling and molecular recognition and their significance for biological systems and textile science and technology (nanofibers, electrostatic self-assembled nanolayer films, carbon nanotubes etc.). Crystal engineering design and synthesis of new structures with desired properties based on an understanding and exploitation of non-covalent interactions. Nanochemistry synthesis of nanostructures and nanomaterials by molecular self-assembling . Application of nanochemistry: nanodevices, surfactants, micelles, liquid crystals, nanoparticles, nanotubes, fibers, gels, polymers etc ...
Preface. Acknowledgments.. List of Contributors.. List of Figures.. List of Tables.. Editor Biographies.. PART I: FUNDAMENTALS OF SUPRAMOLECULAR POLYMERS.. 1. A Brief Introduction to Supramolecular Chemistry in a Polymer Context1 (Raymond J. Thibault and Vincent M. Rotello).. 1.1 Introduction and Background.. 1.2 Main-chain versus Side-chain Supramolecular Polymers.. References.. 2. Molecular Recognition Using Amphiphilic Macromolecules (Malar A Azagarsamy, K. Krishnamoorthy, and S. Thayumanavan).. 2.1 Introduction.. 2.2 Amphiphilic Block Copolymers.. 2.2.1 Non-Specific Interactions.. 2.2.2 Specific Interactions.. 2.3 Amphiphilic Homopolymers.. 2.3.1 Container Properties.. 2.4 Amphiphilic Dendrimers.. 2.5 Conclusions.. 2.6 Acknowledgements.. References.. 3. Supramolecular Control of Mechanical Properties in Single Molecules, Interfaces and Macroscopic Materials (David M. Loveless, Farrell R. Kersey and Stephen L. Craig).. 3.1 Introduction and Background.. 3.2 Mechanical Properties of Linear ...
Carboxylate-ligated, non-haem iron enzymes demonstrate the capacity for catalysing such remarkable processes as hydroxylations, chlorinations and desaturations of inert, aliphatic C-H bonds. A key to functional diversity is the enzymes ability to divert fleeting radicals towards different types of functionalization using active site and/or substrate modifications. We report that a non-haem iron hydroxylase catalyst [Fe(PDP)] can also be diverted to catalytic, mixed hydroxylase/desaturase activity with aliphatic C-H bonds. Using a taxane-based radical trap that rearranges under Fe(PDP) oxidation to furnish a nortaxane skeleton, we provide the first direct evidence for a substrate radical using this class of stereoretentive hydroxylation catalysts. Hydroxylation and desaturation proceed by means of a short-lived radical that diverges in a substrate-dependent manner in the presence of carboxylic acids. The novel biomimetic reactivity displayed by this small molecule catalyst is harnessed to diversify
wherein Pa, Pb and Pc each independently represent a linear or branched chain C1-C30 alkyl group which may have one or more substituents selected from the group consisting of a hydroxyl group, a C3-C12 cyclic hydrocarbon group, a C1-C12 alkoxy group, an oxo group, a cyano group, an amino group or an amino group substituted with a C1-C4 alkyl group, or a C3-C30 cyclic hydrocarbon group which may have one or more substituents selected from the group consisting of a hydroxyl group and a C1-C12 alkoxy group, an oxo group, a cyano group, an amino group or an amino group substituted with a C1-C4 alkyl group,P4 and P5 each independently represent a hydrogen atom, a hydroxyl group, a C1-C12 alkyl group or a C1-C12 alkoxy group,P6 and P7 each independently represent a C1-C12 alkyl group or a C3-C12 cycloalkyl group, or P6 and P7 are bonded to form a C3-C12 divalent acyclic hydrocarbon group which forms a ring together with the adjacent S+, and one or more --CH2-- in the divalent acyclic hydrocarbon group ...
The recombination reaction Mu + NO + MMuNO + M (M = He, N-2, CH4) has been studied by the muon spin relaxation/rotation (mu SR) technique up to 520 bar at room temperature. The reaction remains in the low pressure regime throughout. The measured termolecular addition rate constant in N-2, 8.8 +/- 0.3 x 10(-33) cm(6) s(-1), is essentially the same as that found in our earlier study at pressures below 60 bar [J. J. Pan et al., J. Phys. Chem., 1995, 99, 17160]. It is somewhat smaller in He, 7.7 +/- 1.0 x 10(-33), but larger in CH4, 12.8 +/- 2.0 x 10(-33). The Mu + NO reaction is about five times slower than the corresponding H + NO reaction. The strong collision limits of the rate constants for three H-isotopes (Mu, H, D) reacting with NO have been estimated with Troes formalism for unimolecular dissociation in the low pressure regime, based on the ab initio potential energy surface of Guadagnini et al. [J. Chem. Phys., 1995, 102, 774]. The Troe calculations give less than satisfactory agreement ...
Conversion of bio-derived oils and feedstock with high concentrations of oxygen-containing hydrocarbons into chemicals is a highly desirable objective for environmental and economic sustainability. The production and use of chemicals synthesized from oxygenated feedstocks primarily derived from bio-based sources is projected to grow from $3.6 billion in 2011 to $12.2 billion by 2021. However, no efficient technologies exist for such a conversion because current chemistries rely on catalysts that have been developed for processing natural gas and petroleum fractions with low oxygenate concentrations. To advance progress in chemical synthesis from bio-derived feeds the fundamentals of adsorption and reactivity of oxygenates over metal catalysts, such as Rh, must be better understood. This will enable development of new technologies for oxygenates with promising catalysts formulations.. Ethanol steam reforming (ESR) has been widely explored as a test case in order to identify appropriate catalyst ...
Journal Article: The Influence of Nano-architectured CeOx Supports in RhPd/CeO2 for the Catalytic Ethanol Steam Reforming Reaction ...
Stuart J. Rowans research interests focus on the investigation and utilization of Supramolecular Chemistry (the chemistry of the non-covalent bond) in polymer chemistry. These include Organic Chemistry, Synthesis, Supramolecular Chemistry, Conducting Polymers, Interlocked Macromolecules (polyrotaxanes and polycatenanes), Peptide Nucleic Acids, Supramolecular Polymerization, Reversible Dynamic Chemistry, Responsive Materials and Nanotechnology.\nSpeaking in the special symposium on Polymer Nanotechnology.
A single-cylinder research engine was operated on pure hydrocarbons and simple (two-component) mixtures of pure hydrocarbons to study the effect of fuel composition on exhaust emissions from a spark- ignition engine. Used as fuels were three pure hydrocarbons that represented the primary hydrocarbon types present in commercial motor fuels: a paraffin (2,2,4-trimethylpentane), an olefin (2,4,4- t
Current research in carbohydrates is beginning to range across traditional divisions in chemistry and biology, giving rise to a new interdisciplinary field, glycoscience. The growing interest in glycoscience stems from the discovery that oligosaccharides play an important role in recognition events and from the growing demand for chiral synthesis, since sugars can provide an amazingly cheap source of chiralitiy. This book is the first unified treatment of glycoscience within the framework of organic chemistry. It also offers a wealth of supramolecular associations from carbohydrate chemistry. Unique among texts on carbohydrates, it devotes half of its content to important examples of such interactions. The book begins with a discussion of the configuration, conformation, derivatization, and modifications of monosaccharides. It includes examples of their use in total synthesis and a detailed discussion of the anomeric effect, the most popular of all stereoelectronic effects and a powerful tool ...
The syllabus, which is described in outline below, is aligned with the following QAA benchmark statements for chemistry at FHEQ Level 7 (Masters). • to extend students comprehension of key chemical concepts and so provide them with an in-depth understanding of specialised areas of chemistry; • to develop in students the ability to adapt and apply methodology to the solution of unfamiliar types of problems; • to instill a critical awareness of advances at the forefront of the chemical science discipline; • to prepare students effectively for professional employment or doctoral studies in the chemical sciences; • the ability to adapt and apply methodology to the solution of unfamiliar problems; • knowledge base extends to a systematic understanding and critical awareness of topics which are informed by the forefront of the discipline; • problems of an unfamiliar nature are tackled with appropriate methodology and taking into account the possible absence of complete data. This unit ...
University of Jyväskylä. Kari Rissanen has been Academy Professor in 2008-2012 at the University of Jyväskylä and has now been re-appointed for a second term. His research field is supramolecular chemistry, nanochemistry and X-ray crystallography. Within supramolecular chemistry, Rissanen is a well-renowned expert, both in structural research and synthetics. The focus of his research is on weak intermolecular interactions in solid state materials, solutions and gaseous phases. Special attention is paid to hydrogen and halogen bonds and the coordination chemistry of transition metals. The novel nano- and supramolecular systems that Rissanen has constructed are built on weak intermolecular interactions. Halogen bonding is a relatively new concept, and Rissanens contribution has been crucial to understanding its mechanisms and potential to use it.. Rissanens aim is to construct novel encapsulated supramolecules by applying metal coordination or halogen bonding and new halogen-bonded and ...
Recent developments in the area of anion recognition and sensing have produced a variety of new selective receptors for anions.1However, the great variety of anionic species and their importance in...
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1) J.-M. Lehn, Supramolecular Chemistry. Concepts and Perspectives, VCH, Weinheim, 1995.. (2) J. D. Dunitz, in Perspectives in Supramolecular Chemistry, The Crystal as a Supramolecular Entity, Ed. G. R. Desiraju, vol. 2, John Wiley & Sons, Chichester, 1996, p. 1.. (3) P. N. W. Baxter, J.-M. Lehn, B. O. Kneisel, D. Fenske, Chem. Commun., 1997, 2231.. (4) G. S. Hanan, D. Volkmer, U. S. Schubert, J.-M. Lehn, G. Baum, D. Fenske, Angew. Chem. Int. Ed. Engl., 1997, 36, 1842.. (5) A. M. Garcia, F. J. Romero-Salguero, D. M. Bassani, J.-M. Lehn, G. Baum, D. Fenske, Chem. Eur. J., 1999, 5, 1803.. (6) T. Beissel, R. E. Powers, K. N. Raymond, Angew. Chem. Int. Ed. Engl., 1996, 35, 1084.. (7) D. L. Caulder, R. E. Powers, T. N. Parac, K. N. Raymond, Angew. Chem. Int. Ed., 1998, 37, 1840.. (8) C. Br ckner, R. E. Powers, K. N. Raymond, Angew. Chem. Int. Ed., 1998, 37, 1837.. (9) M. Fujita, D. Oguro, M. Miyazawa, H. Oka, K. Yamaguchi, K. Ogura, Nature, 1995, 378, 579.. (10) T. Kusukawa, M. Fujita, Angew. Chem. ...
Glaeser B( 2010) The 11(1 download core concepts reported: shadow and lettuce. download core decision-making, Caradus J, Gelernter W, Jackson transformation, Keyhani N, Kohl J, Marrone average, Morin L, Stewart A( 2012) have crooknecks required of risk? download core Treatment( 2015) children of volunteers.
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Customs 2901 2901 I.HYDROCARBONS AND THEIR HALOGENATED SULPHONATED, NITRATED OR INTROSATED DERIVATIVES 2901 2901 Acyclic hydrocarbons 2902 2902 Cyclic hydrocarbons 2902000099 2902000099 Others 29021100 29021100 Cyclohexane 99.8 29029090 29029090 Naproxen Sodium
L=1,10-phenanthroline and 2,2-bypiridine)tectons. Download Art 9 (PDF). Key words: chromium complexes, hydrogen bond interaction, oxalate complexes, supramolecular chemistry. 10. Geta DAVID, Bogdan C. SIMIONESCU and Cristofor I. SIMIONESCU. Functional micro- and nanoparticle - a possible tool for nanostructured materials. Download Art 10 (PDF). Key words: micro- and nanoparticles, functional polymers, macromonomers, poly[(N-acylimino)ethylene], polymer supported catalysts, nanostructured materials. 11. Cristina PRISACARIU and Elena SCORTANU. Study of the compression properties of polyurethanes based on dibenzyl monomers and 1,4-butanediol as compared to other diol chain extenders. Download Art 11 (PDF). Key words: 4,4-dibenzyl diisocyanate, polyurethanes, compression, residual elongation, Young modulus. 12. Carmen RACLES, Anton AIRINEI, Aurelia IOANID, Cristian GRIGORAS and Maria CAZACU. Siloxane-azoaromatic polyesters as potential complex dye systems. Download Art 12 (PDF). Key words: ...
Supramolecular chemistry investigates and exploits the chemistry of non-covalent weak interactions occurring among molecules. These are the key interactions responsible for all the recognition, transport, and sensing phenomena that are the basis of biological life, and chemists try to reproduce them in model systems. Even enzymes recognize their substrates through binding, but more importantly they bind and stabilize transition states as well as chemical intermediates. The latter recognition phenomena are responsible for the astonishing rate accelerations typical for enzymes. Molecular recognition is essentially the art of creation of weak intermolecular forces for the construction of structures able to recognize size, shape, functional group distribution, and charge distribution of the target molecule. Target molecules can be charged as well as neutral; however, selective recognition for the latter is more difficult. If the target molecule is in an intermediate state, the host becomes a supramolecular
Book. (1) Polshettiwar, V. and Asefa, T. "Nanocatalysis: Synthesis and Applications" ~736 pages, Edited by, John Wiley & Sons, Inc., 2013. ISBN: 978-1-118-14886-0. Released July 2013:. http://www.wiley.com/WileyCDA/WileyTitle/productCd-111814886X.html. Book Chapters. (8) Asefa, T.*; Dubovoy, V. "Ordered Mesoporous/Nanoporous Inorganic Materials via Self-Assembly" Invited Book Chapter In: Atwood, J. L., (ed.) Comprehensive Supramolecular Chemistry II, 2017, vol. 9, pp. 157-192. Oxford: Elsevier.. (7) Asefa, T.; Huang, X. "Nanocatalysis: Catalysis by Nanomaterials" Invited Book Chapter in Handbook of Solid State Chemistry, First Edition. Edited by Richard Dronskowski, Shinichi Kikkawa, and Andreas Stein, 2017 Wiley-VCH Verlag GmbH & Co. KGaA.. (6) Polshettiwar, V.*; Asefa, T.*; "Introduction to Nanocatalysis" Book Chapter In. Nanocatalysis: Synthesis and Applications" (V. Polshettiwar, T. Asefa, eds.), John Wiley & Sons, Inc., 2013, 1-10.. (5) Asefa, T.*; Biradar, A. V.; Das, S.; Sharma, K. K.; ...
Andrey Klymchenko was born in Kherson, Ukraine, in 1976. He started his research with chemistry and photophysics of new fluorescent dyes, which was a subject of his PhD degree from Kiev National University in 2003. Then, he worked in the University of Strasbourg in a group of Yves Mely, where he could combine synthesis of new dyes with their bioimaging applications. In 2005, in order to extend his expertise towards supramolecular chemistry and nanotechnology, he moved to Catholic University of Leuven, group of Steven de Feyter. Then, he joined CNRS in 2006, received CNRS Bronze Medal in 2010 and was promoted to Director of Research in 2014. In 2015, he obtained ERC consolidator grant BrightSens to work on fluorescent nanoparticles for ultrasensitive detection of cancer markers. ...
Supramolecular chemistry; in particular anion recognition and sensing using conformationally preorganised frameworks and metal assembled cages (collaboration with Prof Thorfinnur Gunnlaugsson from Trinity College Dublin-Ireland and also Prof Guido Clever from TU Dortmund - Germany). Bioactive heterocycles as therapeutics and diagnostics (Collaboration with Dr Scott Stewart from UWA, Dr Sean McGee, Prof Ken Walder and Dr Guy Krippner from Verva). Synthesis of new cationic amphiphilies as antimicrobial peptide mimics (collaboration with Prof Roger Nation and Dr Jian Li at Monash MIPS and also Prof Matthew Cooper and Dr Alysha Elliot from University of Queensland). Recent grants include:. Discovery DP140100227 Novel Synthetic Receptors for Recognition and Transport of Biologically Important Anions. MRCF (Medical Research Commercialisation Fund) Rapid development ...
Molecular machines are an important and emerging frontier in research encompassing interdisciplinary subjects of chemistry, physics, biology, and nanotechnology. Although there has been major interest in creating synthetic molecular machines, research on natural molecular machines is also crucial. Biomolecular motors are natural molecular machines existing in nearly every living systems. They play a vital role in almost every essential process ranging from intracellular transport to cell division, muscle contraction and the biosynthesis of ATP that fuels life processes. The construction of biomolecular motor-based biomimetic systems can help not only to deeply understand the mechanisms of motor proteins in the biological process but also to push forward the development of bionics and biomolecular motor-based devices or nanomachines. From combination of natural biomolecular motors with supramolecular chemistry, great opportunities could emerge toward the development of intelligent molecular ...
The group is working in two different areas. One area is focused on the use of boron clusters as new entities for drugs and in supramolecular chemistry. The clusters have unique properties which are not found in organic or other inorganic molecules. They are the first anions which bind strongly to supramolecular hosts such as cyclodextrins and cucurbiturils. Due to the unusual properties of the cluster, their interaction with biological membranes is unexpected. The necessary methods for synthesizing derivatives of these clusters are being pursued.. The other area deals with the development of new dyes for ocular surgery. The aim is to develop better dyes, especially for visualization of the internal limiting membrane. This work includes synthesis, testing for toxicity in vitro, staining in suitable models, and collaboration with ophthalmologists for eventual application in the clinic.. Boron clusters. ...
Network structures based upon metal-organic backbones represent a new class of functional materials that can be rationally constructed by employing the concepts of supramolecular chemistry and crystal engineering. The modularity of design strategies, the diversity of prototypal structures, and the dynamic features of networks have afforded great advantages over traditional materials syntheses. The research presented in this thesis is primarily concerned with developing an in-depth understanding of the basic principles that govern the supramolecular behaviors of metal-organic networks and gaining an experimental control over the structure and function of these new classes of hybrid materials.The use of rigid and angular organic ligands along with transition metal clusters gives rise to a wide variety of novel metal-organic architectures ranging from zero-dimensional nanostructures to three-dimensional frameworks. Conformational analysis of these structural models suggests the geometric foundations for
Editor-in-Chief Professor Mir Wais Hosseini is one of two recipients of the the Grand Prix Joseph-Achille Le Bel Award, 2016 in recognition of his remarkable discoveries in supramolecular chemistry. The prize is awarded annually and recognises French chemists whose work have achieved international acclaim.. After starting his scientific career under the direction of Jean-Marie Lehn, Professor Hosseini created his own laboratory and focussed his research towards molecular tectonics which corresponds to large-scale (millimeter) molecular architectures in the solid state by self-assembling "tectons". The formation of these non-covalent assemblages involves three types of interactions: coordination bonds, combinations of directional hydrogen bonds and electrostatic interactions, and van der Waals interactions. Their structure can be controlled and programmed according to one, two or even three dimensions by coding information at the tecton level.. His work has brought a major breakthrough in the ...
B. Söptei, Mihály, J., Szigyártó, I. Cs., Wacha, A., Németh, C., Bertóti, I., May, Z., Baranyai, P., Sajó, I. E., and Bóta, A., "The supramolecular chemistry of gold and l-cysteine: Formation of photoluminescent, orange-emitting assemblies with multilayer structure", Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol. 470, pp. 8 - 14, 2015. ...
B. Söptei, Mihály, J., Szigyártó, I. Cs., Wacha, A., Németh, C., Bertóti, I., May, Z., Baranyai, P., Sajó, I. E., and Bóta, A., "The supramolecular chemistry of gold and l-cysteine: Formation of photoluminescent, orange-emitting assemblies with multilayer structure", Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol. 470, pp. 8 - 14, 2015. ...
Ram n y Cajal Fellow at University of Zaragoza - Instituto de Ciencia de Materiales de Arag n - Cited by 3,368 - Polymers - Supramolecular Chemistry - Dynamic Materials
D1016 - 05(2015) Standard Test Method for Purity of Hydrocarbons from Freezing Points , crystallization, freeze point, LPG, pure hydrocarbons, purity,,
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The consecutive ion-molecule reactions in acetylene within the pressure limits of 0.00001 and 0.01 torr have been investigated as a function of the energy transferred to the acetylene molecule during the initial ionization by charge exchange with incident positive ions of low kinetic energy. The reactions of the molecular ion in the ground electronic state pi(u)(-1) are distinguished from those of the molecular ion in an excited electronic state sigma(g)(-1). The various chain sequences of reaction, including those involving ions with uneven numbers of carbon atoms, are elucidated, and numerous reactions proposed by earlier workers are shown to be unimportant in the pressure range investigated. Rate constants are calculated for the various ion-molecule reactions. (Author)(*ALKYNES
The coordination chemistry of Rh(III) porphyrin was outlined by Sadasivan and Fleischer in 1967.199,200 Their Rh(III) porphyrin, obtained by a metallation reaction using [Rh(CO)2Cl]2 and aerial oxidation, was believed to coordinate a labile water molecule which could be displaced by pyridine. A coordinated chloride counterion could be exchanged for azide, cyanide or hydroxide. Work by other groups has demonstrated that six coordinate Rh(III) porphyrins with two identical axial ligands may be generated by reaction of Rh(III)Cl porphyrins (OEP, TPP) with Ag+ to remove the chloride anion, followed by treatment with ligands such as BuNC, PPh2Me and POMe3.201,290 Reaction of Rh(III)Cl porphyrins with organolithium reagents232 or metal carbonylate anions202 afforded organometallic and metal-metal bonded derivatives respectively. The [(OEP)Rh]+ intermediate formed by treatment of (OEP)RhCl with AgBF4 was found to be active in electrophilic aromatic substitution reactions to afford s-bonded Rh aryl ...
Define squalene: an acyclic hydrocarbon C30H50 that is widely distributed in nature (such as a major component of sebum and in shark-liver oils) and …
Alkane and olefin radical cations, fundamental reaction intermediates in organic chemistry and in the radiation chemistry of hydrocarbons, have been characterized by time-resolved Fluorescence...
Compared with mCPBA, the advantages of using dioxiranes are neutral reaction conditions, easy workup (since the byproduct is only acetone), and low cost of the reagents. However, dioxirane reagents are unstable and have to be prepared freshly for each experiment. These reagents require purification by vacuum distillation and somewhat special handling.. For certain substrates, direct hydroxylation of unactivated aliphatic C-H bonds is possible.. ...
The mononuclear metal complexes of the chelating bidentate 1,10-phenanthroline (phen) and 2,2-bipyridine (bipy) ligands are well known in the literature, and have been used in many fields. In the realm of coordination polymers, these complexes have been employed as coordination acceptor nodes for the construction of low dimensional polymer-based magnets exhibiting long-range magnetic ordering and spin crossover transitions. 1,10-Phenanthroline is of great interest in the field of supramolecular chemistry, because it can bring C-H···O or C-H···N hydrogen bonds and π-π stacking interactions (Liu et al., 2004 and Wang et al., 2003), which can effectively result in one-dimensional or two-dimensional networks. We report here the preparation and crystal structure of the title compound,[Cu(C9H7O2)2(C12H8N2)].. The asymmetric unit contains a half CuII cation, a half phen ligand and one cinnamic ligand (L-: C6H5-CH=CH-COO-). The CuII atom lies on a twofold rotation axis. In the complex, two ...
Engineering of mixed-valence (MV) radical cations and intermolecular complexes based on pi-extended tetrathiafulvalenes (TTFs) is central for the development of organic conductors. On another front, redox-controlled dimerization of radical cations has recently been recognized as an important tool in supramolecular chemistry. Here we show that pi-extended TTFs based on the indenofluorene core, prepared by Horner-Wadsworth-Emmons reactions, undergo reversible and stepwise one-electron oxidations and that the detectable, intermediate radical cation forms remarkably strong intermolecular MV ([neutral.cation]) and pi-dimer ([cation.cation]) complexes with near-infrared radical cation absorptions. The radical cation itself seems to be a so-called Class III MV species in the Robin-Day classification. The formation of MV dimers was corroborated by ESR spectroelectrochemical studies, revealing two slightly different ESR signals upon oxidation, one assigned to the MV dimer and the other to the cation monomer.
Calixarenes bear a fascinating class of macrocycles that have served broadly in molecular recognition and supramolecular chemistry. These, supramolecular structures have been utilized in several different directions ranging from catalysis to therapy.
Current Research and Scholarly Interests The underlying theme of the Appel Lab at Stanford University integrates concepts and approaches from supramolecular chemistry, natural/synthetic materials, and biology. We aim to develop supramolecular biomaterials that exploit a diverse design toolbox and take advantage of the beautiful synergism between physical properties, aesthetics, and low energy consumption typical of natural systems. Our vision is to use these materials to solve fundamental biological questions and to engineer advanced healthcare solutions. ...
The phenylurea moiety is a ubiquitous synthon in supramolecular chemistry. Here we report that the introduction of chlorine or bromine atoms in the ortho positions to the urea unit is a simple and very efficient way to improve its intermolecular hydrogen bond (HB) donor character. This effect was demonstrated in solution both in the context of self-association of bis-ureas and hydrogen bonding of mono-ureas to strong HB acceptors.. ...
Marega, R., Giust, D. and Bonifazi, D. 2013. Supramolecular chemistry of carbon nanotubes at interfaces: toward applications. In: Fullerenes and Other Carbon-Rich Nanostructures., Vol. 159. Structure and Bonding Springer, pp. 193-218., (10.1007/430_2013_129 ...
The work presented here describes the extension and combination of two existing models, which were then used to simulate the sidewall profiles obtained when etching InP in a CH4/H2 plasma under a range of plasma conditions. The prediction of sidewall profiles as a function of Reactive Ion Etching (RIE) parameters has considerable commercial application.. The first model simulates the ion energy and angle distributions (IEDs and IADs) at the electrodes of a HE chamber and has been extended to model high pressure H2 plasmas. Eighteen ion-molecule reactions and their energy-dependent cross sections have been included to take account of collisions in the sheath region of the plasma which significantly affect the IED. This model which uses three fitting parameters has successfully reproduced IEDs measured by Dickenson at the anode of a reactive ion etcher. Using the fitting parameters obtained to reproduce experimental IEDs, cathode IEDs have been predicted. Cathode IEDs have also been predicted for ...
RegenLab® PRP-plazmoterapija ir pasaulē vienīgā procedūra, kur bez jebkādas karsēšanas tiek veidots unikāls autogēls no paša pacienta plazmas speciāli izstrādātās un patentētās RegenACR® mēģenēs.. Regenlab® autogēls ir kļuvis par vienu no vispieprasītākajām injekciju procedūrām vadošajās anti-age medicīnas kosmetoloģiskajās klīnikās, jo šis biopreparāts bez savām atjauninošajām un atveseļojošajām funkcijām sniedz arī plašas iespējas plazmoplastikai.. Ar autogēla palīdzību kļuvis iespējams atjaunot 3D sejas skulptūru, tas ir, piešķirt zināmu apjomu audiem, kas agrāk bija iespējams tikai ar kontūrplastikas palīdzību, kā arī izlīdzināt un samazināt grumbas, dziļi mitrināt ādu.. ...