A new Schiff base ligand derived from S-benzyldithiocarbazate and 4-[N-hydroxy ethyl-N-(methyl)amino]benzaldehyde (HL, where H is a dissociable proton) and its NiII, CuII, ZnII and PdII complexes were prepared and fully characterized. The structures of HL and Ni(L)2 were determined by X-ray diffraction analysis, which revealed that the geometry of the NiII ion is square-planar with two equivalent Ni=N and Ni=S bonds, and that the two neighboring molecules in two layers have weak contact. The electronic spectra and solution fluorescence of the ligand and the complexes were studied, and the quantum yields of single-photon fluorescence for the compounds were determined. The compounds possess two-photon absorption (t.p.a.) character and the t.p.a. coefficient β and t.p.a. cross-section σ were determined by the Z-scan technique. Especially, the Zn(L)2complex and the HL ligand exhibit intensive two-photon fluorescence (t.p.f.) at 800 nm laser pulses in the femtosecond regime.. ...
The synthesis and antimicrobial activity of novel Zn(II) metal complexes derived from three novel heterocyclic Schiff base ligands 8-[(Z)-{[3-(N-methylamino)propyl]imino}methyl]-7-hydroxy-4-methyl-2H-chromen-2-one, 2-[(E)-{[4-(1H-1,2,4-triazol-1-ylmethyl)phenyl]imino}methyl]phenol, and (4S)-4-{4-[(E)-(2-hydroxybenzylidene)amino]benzyl}-1,3-oxazolidin-2-one have been described. These Schiff base ligands and metal complexes are characterised by spectroscopic techniques. According to these data, we propose an octahedral geometry to all the metal complexes. Antimicrobial activity of the Schiff base ligand and its metal complexes was studied against Gram negative bacteria: E. coli and Pseudomonas fluorescens, Gram positive bacteria: Staphylococcus aureus, and also against fungi, that is, C. albicans and A. niger. Some of the metal complexes show significant antifungal activity (MIC | 0.2 μ g/mL). The in vitro data has identified [Zn(NMAPIMHMC)2]·2H2O, [Zn(TMPIMP)2]·2H2O, and [Zn(HBABO)2]·2H2O as
Synthesis, spectral characterization, electrochemical and anti-microbial activities of new binuclear Schiff base metal complexes derived from 3,3 diaminobenzedine
Transition metal, cobalt (II) acetate, complexes of salicylaldehyde derived Schiff bases : 2-{[(2- hydroxophenyl) imino] methyl} phenol (OHMP), 2-{[ (2- carboxy- phenyl) imino] methyl} phenol (COOHMP), and anthranilic acid- formaldehyde resin (R-COOHMP) were synthesized and characterized by various analytical and spectroscopic studies ( FT-IR, UV-Visible and 1H NMR ). The Schiff base ligands, formaldehyde chelating resin and their Co(II) complexes were also screened for their urease, α - chymotrypsin, acetylcholinesterse and butylrylcholinesterase inhibition activities. The ligands were found active against two bacterial species: Staphylococcus aureus and Escherichia coli, all theligands and complexes were evaluated for their thermal degradation studies using TG- DTA analytical methods in static air. Keywords: Biological Activity, Cobalt(II)-Complexes, formaldehyde resin. ...
In the structure of aquachloro[7,10,13-trioxa-3,17,23-triazabicyclo[17.3.1]tricosa-1 (23),2,17,19,21-pentaene-N,N,N ]copper(II) hexafluorophosphate acetonitrile solvate, the Cu-II ion is pentacoordinate with square-pyramidal coordination geometry, with a relatively long axial bond to water [2.244 (5) Angstrom] and with the shortest Cu-N bond being to the pyridine N atom. The water molecule is also hydrogen bonded to two O atoms of the ligand. the complex is folded about the N-Cu-N axis, the polyether chain being nearly planar and making an angle of about 135 degrees with the pyridine ring.. ...
Many Organothallium Compounds have been used in medicine, industry and antibacterial activity. Optical properties are among the most fascinating and useful properties of many complexes and have been extensively studied using a variety of optical spectroscopic techniques. A basic understanding of the optical properties and related spectroscopic techniques is essential for characterization about semiconductors, insulators or metal. Optical properties are related to other properties and functionalities (e.g. electronic, magnetic, and thermal) that are of fundamental importance to many technological applications, such as energy conversion, chemical analysis, biomedicine, opto-electronics, communication, and radiation detection. The fundamental importance of Thallium is the ability to accept electrons due to empty d-orbitals and thus establish additional bonds (σ bond and π bond) in chemistry. The Thallium metal, which has outer electronic configuration 6 s2, 6 p1 shows oxidation states of Thallium (III)
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INTRODUCTION. In a recent report by Nishikawa et al. (1), the microorganisms isolated from the soil exhibited resistance towards benzalkonium chloride. Russel and co-workers have (2) proposed two possible mechanisms for such resistance: the intrinsic and acquired resistances. The intrinsic resistance related to the structural and chemical composition of the outer layers of the cells, which may provide an effective barrier to the entry of antibacterial agents. The acquired resistance results from genetic changes in the bacterial cell and arises either by mutation or by the acquisition of genetic material from another cell. Extensive investigations in the field of Schiff bases have been reported (3-5). Antimicrobial and antifungal activities of various Schiff bases ...
The development of eco-friendly and environmentally benign catalytic systems is one of the main themes of modern organic synthesis. Ammonium chloride (NH4Cl) is a very inexpensive and readily available catalyst; it has been reported as a catalyst for the synthesis of various heterocyclic compounds (Shaabani et al. 2003; Dabiri et al. 2009; Fortenberrya et al. 2013; Foroughifarab et al. 2011; Maleki and Salehabadi 2010; Shaabani et al. 2008; Hussein 2015). There are many bioactive molecules which possess various heteroatoms such as nitrogen, sulfur and oxygen, always taken the attention of chemists over the years mainly because of their biological significance. Pyrano derivatives have well-known biological effects, such as analgesic and anti-inflammatory activities (El-Zohry et al. 2008a). Indolinone and spiro-indoline derivatives have possessed broad-spectrum therapeutic activities such as anticonvulsants (Ragavendran et al. 2007; Azam et al. 2009; Sridhar et al. 2002), antibacterial (Rahman et ...
Haem a with denatured proteins in strongly alkaline solutions forms haemochromes whose α-absorption bands lie 15 to 20 mμ more towards shorter wavelengths than those of haemochromes with other nitrogenous ligands. It is found that this is due to the formation of Schiffs bases, the formyl side chain of haem a being condensed with amino groups of the protein. The same reaction is given by other haems and porphyrins with formyl side chains. The Schiffs bases are stable only at high pH and are dissociated at pH 7 to 8. Schiffs bases with methylamine are also obtained with high concentration of methylamine at high pH. These compounds are compared with alkaline indicator yellow (retinal-opsin) and retinylidene methylamine. ...
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Opsins are proteins and the retinal-binding visual pigments found in the photoreceptor cells in the retinas of eyes. An opsin is arranged into a bundle of seven transmembrane alpha-helices connected by six loops. In rod cells the opsin molecules are embedded in the membranes of the disks which are entirely inside of the cell. The N-terminus head of the molecule extends into the interior of the disk, and the C-terminus tail extends into the cytoplasm of the cell. In cone cells the disks are defined by the cells plasma membrane so that the N-terminus head extends outside of the cell. Retinal binds covalently to a lysine on the transmembrane helix nearest the C-terminus of the protein through a Schiff base linkage. Formation of the Schiff base linkage involves removing the oxygen atom from retinal and two hydrogen atoms from the free amino group of lysine, giving H2O. Retinylidene is the divalent group formed by removing the oxygen atom from retinal, and so opsins have been called retinylidene ...
A new Schiff base metal complex of quinoxiline 2-carboxyaldehyde and L-histidine was prepared. The resulting complex was analyzed through different physiochemical techniques like elemental analysis, molar conductivity measurement ,Thermo gravimetry and differential gravimetry technique, FT-IR, EPR spectrum etc. The catalytic application of the complex was checked in liquid phase hydroxylation of phenols. The effect of different physical and chemical parameters like effect of catalyst amount and oxidant ,effect temperature were also recorded. It was found ...
This work describes the synthesis of two Schiff bases. One of the bases is derived from dialdehyde (2-[5-(2-formylphenoxy)pentoxy]-benzaldehyde and m-phenylenediamine, while another base is derived from 2-[4-(2-formylphenoxy)butoxy]-benzaldehyde) and from same diamine m-phenylenediamine. Obtained Schiff bases were used ih reactions with salts of transition metals: silver (I) nitrate and mercury (II) nitrate monohydrate. Analysis of the bases was made with the IR spectroscopy and analysis of complex compounds was made with the IR spectroscopy and thermal analysis (TGA-DSC). Analysis of products that were synthesized in the reaction between the Schiff bases and inorganic salts: silver (I) nitrate and mercury (II) nitrate monohydrate shows that complex compounds with macrocyclic Schiff bases are derived ...
Abstract In their fight for supremacy and survival, microorganisms have been developing and devising various methods to inactivate the action of antibiotics. The numbers of drug resistant microorganisms with reduced susceptibility to various antibiotics are increasing. Therefore, new infection-fighting strategies are required to control microbial infections. The interaction between potent chemicals and living system contribute to the understanding of life processes and provide effective methods for treatment, prevention and diagnosis of many diseases. Phenol Schiff bases like chalcone imines and flavone imines were screened for their antimicrobial activity against a wide range of pathogenic bacteria and fungi. The in vitro activity of the compounds was evaluated by the Kirby-Bauer disc diffusion method and the MIC was determined for a few selected compounds. Most of the compounds showed significant antimicrobial activity. The compounds were found toxic to bacteria like Staphylococcus aureus, ...
Synthesis, spectral studies and in vitro antimicrobial activity of some new Di/Triorganotin (IV) complexes of Schiff bases derived from 2-benzoylpyridine
High reactivity of the Schiff base product of p-toluidine with pyridine-2-carboxaldehyde was observed, leading to methyl group isomerization (immigrat..
For the long story, see Phenylmethylamine: A nucleophilic Schiff base where the N-substituted anion is fused to a benzene ring (?) to yield a enamine. See also Ethanamine. Note that the C=N double bond is the result (product) of asymmetric synthesis (Micheal addition) in presence of a organometal catalyst ...
Gold nanoparticles AuNPs were prepared by the reduction of sodium tetrachloroaurate (III) (NaAuCl4) with Schiff base derivative of Nacetylisatin with ..
Three positional isomers of a Schiff base containing -OH as end groups have been synthesized and evaluated for selective Al(iii) detection due to inhibition of ESIPT, PET and activation of CHEF in 70% aqueous medium. Devoid of any conventional fluorophore, these sensors have nanomolar detection limits with h
Pseudomonas sp. lipase was immobilized onto glutaraldehyde-activated Florisil (R) support via Schiff base formation and stabilized by reducing Schiff base with sodium cyanoborohydride. The immobilization performance was evaluated in terms of bound protein per gram of support (%) and recovered activity (%). A 4-factor and 3-level Box-Behnken design was applied for the acylation of (+/-)-2-(propylamino)-1-phenylethanol, a model substrate, with vinyl acetate and the asymmetric acylations of other (+/-)-2-amino-1-phenylethanols with different alkyl substituents onto nitrogen atom such as (+/-)-2-(methylamino)-1-phenylethanol, (+/-)-2-(ethylamino)-1-phenylethanol, (+/-)-2-(butylamino)-1-phenylethanol and (+/-)-2-(hexylamino)-1-phenylethanol were performed under the optimized conditions. The optimal conditions were bulk water content of 1.8%, reaction temperature of 51.5 degrees C, initial molar ratio of vinyl acetate to amino alcohol of 1.92, and immobilized lipase loading of 47 mg mL(-1). ...
Transamination catalyzed by aminotransferase occurs in two stages. In the first step, the α amino group of an aminoacid is transferred to the enzyme, producing the corresponding α-keto acid and the aminated enzyme. During the second stage, the amino group is transferred to the keto acid acceptor, forming the amino acid product while regenerating the enzyme. The chirality of an amino acid is determined during transamination. For the reaction to complete, aminotransferases require participation of aldehyde containing coenzyme, pyridoxal-5-phosphate (PLP), a derivative of Pyridoxine (Vitamin B6). The amino group is accommodated by conversion of this coenzyme to pyridoxamine-5-phosphate (PMP). PLP is covalently attached to the enzyme via a Schiff Base linkage formed by the condensation of its aldehyde group with the ε-amino group of an enzymatic Lys residue. The Schiff base, which is conjugated to the enzymes pyridinium ring is the focus of the coenzyme activity. ...
Two mononuclear Re(v) complexes were synthesized using two different O, N, N coordinating Schiff base ligands. The X-ray structure and catalytic ...
The copper complex of a polydentate non-symmetrical Schiff base ligand [LCu]2, prepared by template synthesis, has been reacted with the series of lanthanide ions. This complex used as a ligand possesses two functions (phenol and oxime) able to coordinate the Ln ions and, according to the Ln ion, three types
Purpose: : Opsins, the protein component of photopigments, are classified into five classes for vertebrates. These classes are short wavelength sensitive 1 and 2 (SWS1, SWS2), medium/long wavelength sensitive (M/LWS) and rod-opsin-like 1 and 2 (RH1, RH2). In rod-opsin two critical amino acids are K296, which binds the retinal based chromophore through a Schiff base, and E113, which acts as the counterion to the protonated Schiff base. Corresponding residues in each of the other four vertebrate opsin classes play similar roles. Using bovine rhodopsin, it has been shown that these two sites form a salt-bridge in the apoprotein which maintains the opsin in an inactive state. In RH1 opsins, disruption of this critical salt-bridge through mutation has been shown to shift the opsin into an active conformation that has the ability to constitutively activate transducin. We are interested in the conservation of this property across the other classes of vertebrate opsins. Methods: : Site directed ...
I am generally interested in understanding the structure, mechanism of action, and enzymology (inhibition) of proteins that lead to infectious disease, inflammation, and cancer. My research projects are multidisciplinary and include structural biology, enzymology, structural genomics, bioinformatics, mutational analysis, high throughput screening, inhibitor design, and structure-activity relationship investigation. Exploring the mechanism of enzyme catalysis to answer those fundamental questions in our textbook is another field of my research. In particular of interest, I have worked on the mechanisms involved in carbon bond cleavage and formation going through Schiff base intermediate, which may provides some novel strategies in protein conjugation for drug development ...
L-glutamine-o-vanillin-copper: L-glutamine Schiff base copper complex; a proteasome inhibitor that induces apoptosis in human cancer cells; structure in first source
The solid state structures of the copper(II) Schiff base complexes [{Cu(1)}(H2O)], [Cu(1)(OH2)]center dot MeCN and [({Cu(1)}(H2O))(2)(2)] (H(2)1 = N,N-(1R,2R)-(-)-1,2-cyclohexylenebis(3-ethoxysalicylideneamine) and 2 naphthalene-2,6-dicarboxylic acid) exhibit two recurring structural motifs: host-guest, hydrogen-bonded recognition of H2O in the O,O,O ,O-cavity of [Cu(1)], and face-to-face stacking of [Cu(1)] units with non-bonded Cu center dot center dot center dot Cu separations of 3.54-4.89 angstrom. In [{Cu(1)}(H2O)], the H2O molecule is non-coordinated to the copper(II) centre whereas in [Cu(1)(OH2)]center dot MeCN it is axially bound to the copper(II) atom while retaining its role as a hydrogen-bonded guest in the O,O,O ,O-cavity of an adjacent [Cu(1)] molecule. The guest H2O molecule in [{Cu(1)}(H2O)] can function as a hydrogen bond donor as illustrated by the assembly of [({Cu(1)}(H2O))(2)(2)]. Solution (in THF) electronic spectroscopic data for the complexes are consistent ...
Synthesis, Characterization, Ab initio Calculations, Thermal, Thermodynamic and Antioxidant Properties of Some Oxovanadium(IV) Complexes Containing O,O- , N,N- and N,O- Donor Sphere and Synthesis, Characterization and Thermodynamics of Some New Unsymmetrical Co(III) Schiff Base Complexes Derived from ۲,۳- and ۳,۴- ...
Downloadable! A study of distortions to agricultural incentives in 18 developing countries during 1960-84, by Krueger, Schiff and Valdés (1988; 1991), found that policies in most of those developing countries were directly or indirectly harming their farmers. Since the mid-1980s there has been a substantial amount of policy reform and opening up of many developing countries, and indicators of that progress have been made available recently by a new study that has compiled estimates for a much larger sample of developing countries and for as many years as possible since 1955. The new study also covers EuropeÂs transition economies and comparable estimates for high-income countries, thereby covering more than 90 percent of world agricultural output and employment. This paper summarizes the methodology used in the new study (pointing out similarities and differences with those used by the OECD and by Krueger, Schiff and Valdés), compares a synopsis of the indicators from Krueger, Schiff and ValdÃ
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4IUO: Crystal structures of type I dehydroquinate dehydratase in complex with quinate and shikimate suggest a novel mechanism of schiff base formation.
And another one - Is this a right way to think about Schiffs bases - if I like an aldehyde, and want something similar as a base (i.e - long lived), I should just add the same amount of methyl anthranilate (or indole..)?
A new method has been developed for the extraction and determination of zinc and nickel in liquid edible oils by using the complexation of these metals with [N,N′-bis(salicylidene)-2,2′-dimethyl-1,3-propanediaminato]. Zn(II) and Ni(II) complexes with a tetradentate Schiff base have been investigated spectrophotometrically. Experimental extraction conditions for these metals from liquid oil standards were optimized using central composite design. Optimum conditions for Zn(II) and Ni(II) extractions from oil have been found close to each other. The ratio of the volume of used Schiff base solution to the amount of oil (VLDM/moil; mL/g), the stirring time and the temperature were round about 1.00 mL/g, 55 min, 32°C, respectively, for simultaneous determination of both metals in same sample. The recovery percentages at the optimum experimental conditions were found 98.9 ± 2.8 and 101.8 ± 4.7 for Zn(II) and Ni(II), respectively. The proposed method was applied on the raw and spiked samples such ...
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As the expected voices of outrage and condemnation rained down, Gaetz did not waver in his stance that what has been taking place is Adam Schiff controlling the investigation and not allowing for full disclosure. The congressman sat in with MSNBCs Hallie Jackson, and while the hostess challenged Gaetz on his actions, he did not allow her to control the narrative. It became a revealing exchange, in which Gaetz had to correct the record as it was being manipulated on air.. "I havent heard you say anything since Bill Taylor testified," challenged Jackson. "Yes or no, is it OK for any politician to trade military aid for political favors?" she asked. Gaetz did not equivocate. "Look, Im not going to get into the specifics of the Taylor deposition because I wasnt present for it," he replied. This is a significant detail. Adam Schiff has not allowed the full House to have access to the deposition, yet here is a member of the press moving forward with details. It illustrates the manner in which ...
Schiff Move Free Ultra Triple Action, 75 Tablets(一組6瓶). Schiff Move Free Ultra Triple Action, 75 顆為加強型迷你錠結合最佳科學及自然的健康產品, 用來促進健康的關節, 每日服用可幫助維護關節活動力及柔軟度。. 非變性二型膠原蛋白膠囊(UCII/UC2),是更優於葡萄糖胺及軟骨素的保健食品。UC-II 的主要功能:減緩關節疼痛與發炎,停止軟骨骨骼遭侵蝕,改善關節靈活性,修復及重建軟骨,促進骨關節長期健康. 硼是人體必需的微量元素之一,對健康非常重要。最近的研究顯示,硼可以促進鈣、鎂、鉀、磷的吸收和代謝,因此能促進骨骼合成並且預防骨質疏鬆,對骨骼發育和維護有重要影響。. Hyaluronic Acid 膠原蛋白可補充關節液,讓關節活動更加順暢。. 主要成份: 每1顆含. Undenatured Type II Collagen UC-II非變性二型膠原蛋白 40mg. 硼 5mg. Hyaluronic Acid 膠原蛋白 3.3mg. ...
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With Valentines Day and his first wedding anniversary both in the same week, comedian Mark Schiff has been thinking a lot about love and marriage.Schiff, who is appearing at the Brea Improv through
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András Schiff plays Schubert I. EuroArts: 2066798. Buy DVD Video online. András Schiff (piano), with Yuuko Shiokawa (violin) & Miklós Perényi (cello), with Miklós Perényi (cello) .
Targeting substance-diagnostic/therapeutic agent conjugates joined by stabilized Schiff base or hydrazone linkages are disclosed. In addition, slow release carrier-drug pharmaceuticals are described. The diagnostic and therapeutic conjugates and pharmaceuticals of the present invention provide certain advantages relating to in vivo administration, including controlled release of the active agent at a target site.
Sigma-Aldrich offers abstracts and full-text articles by [Alexander E Sorochinsky, José Luis Aceña, Hiroki Moriwaki, Tatsunori Sato, Vadim A Soloshonok].
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Chemical and Process Engineering Research www.iiste.org ISSN 2224-7467 (Paper) ISSN 2225-0913 (Online) Vol.13, 2013 19 Synthesis and Characterization of Comple…
The reaction of titanium tetrachloride withN-phenyl benzalaldimine and some of its monomethylated and dimethylated derivatives, L, yields complexes of gene
Schiff ran into Bernanke at a conference recently. Here is Schiffs recollection of their encounter.. "We got the photograph out of the way. Then I wanted to talk to him. The first thing I wanted to do was I wanted to give him my version of why the economy is so screwed up and why everything in it is wrong. The last thing he wanted to get was a lecture from me, but thats what I tried to give him. But I tried to give him the Cliff Note version. I did want to ask him some questions, but I wanted to get his reaction to my take.. "I started talking about the housing bubble and the financial crisis and how the Federal Reserve caused that with its low interest rates. He said that no, it wasnt that; that the interest rates had nothing to do with it. He first told me that the housing bubble was caused by Fannie and Freddie. At least hes trying to blame the government. I said, Look, Fannie and Freddie have been around since the 30s. We didnt have that big housing bubble until the Fed happened to ...
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