- Tridentate Schiff base coordinated trigonal bipyramidal / square pyramidal copper(II) complexes: Synthesis, crystal structure, DFT / TD-DFT calculation, catecholase activity and DNA binding
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Using tridentate O,N,O/N,N,O donor Schiff bases and 1,10-phenanthroline, five coordinated copper(II) complexes, {[Cu(L1)(phen)][Cu(L1)(phen)]?5H2O}(1) and {[Cu(L2)(phen)](ClO4)}(2) [H2Lsup
- Bhunia, Apurba,Vojtí?ek, Pavel,Bertolasi, Valerio,Manna, Subal Chandra
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- Heterovalent trinuclear Co(III)-Co(II)-Co(III) complexes with N-(2-carboxyethyl)salicylaldimines
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He heterovalent trinuclear cobalt complexes [Co2 IIIL4i · CoII(H 2O)4] · nXmY (Li are deprotonated Schiff bases derived from substituted salicylaldehydes and β-alanine; i = 1-3) were obtained and characterized. An X-ray diffraction study of the trinuclear cobalt complex with N-(2-carboxyethyl)salicylaldimine showed that the central Co(II) ion and the terminal Co(III) ions are linked by bridging carboxylate groups. Either terminal Co(III) atom is coordinated to two ligand molecules. They form an octahedral environment consisting of two azomethine N atoms, two phenolate O atoms, and two O atoms of two carboxylate groups. The central Co(II) atom is coordinated to four water molecules and to two O atoms of two bridging carboxylate ligands involved in the coordination sphere of the terminal Co(III) atoms. Pleiades Publishing, Ltd., 2012.
- Garaeva,Medzhidov,Beukgunger,Aydin,Yalcin,Abbasov
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- Epoxidation of styrene with H2O2 catalyzed by alanine-salicylaldehyde schiff base chromium (III) complexes immobilized on mesoporous materials
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Alanine-salicylaldehyde Schiff base chromium (III) complex was immobilized on mesoporous silica gel (SiO2), MCM-41 and SBA-15. The resulting immobilized complexes were promising catalysts for the epoxidation of styrene with 30% hydrogen peroxide, and they all showed much higher catalytic performance than their homogeneous analogue. Simultaneously, the catalytic performance of immobilized complexes was found to be closely related to the textual and surface properties of the supports used. The complex immobilized on methyl-containing MCM-41 exhibited the highest catalytic performance. Under optimal reaction conditions, the highest conversion of styrene reached 80.2% with 77.0% selectivity to epoxide. In addition, the catalytic performance remained stable after six times of recycling. Graphical Abstract: A series of immobilized alanine-salicylaldehyde Schiff base chromium (III) complexes were promising catalysts for the epoxidation of styrene with 30% hydrogen peroxide. Moreover, the different textural and surface properties of supports significantly influenced their catalytic performance.
- Wang, Xiaoli,Wu, Gongde,Wei, Wei,Sun, Yuhan
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experimental part
p. 96 - 105
(2010/08/20)
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- Structure-stability correlations for imine formation in aqueous solution
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Imine formation between 25 aldehydes and 13 amines in aqueous solution in the pH range 7-11 was studied by 1H NMR spectroscopy. A three-parameter linear equation correlating logarithms of imine formation constants with pKa and HOMO energies of amines and LUMO energies of aldehydes is proposed. In view of the widespread occurrence of imine-forming processes in both chemistry and biology, the data presented are of significance for physical organic chemistry and of particular interest for dynamic combinatorial chemistry. Copyright
- Godoy-Alcantar,Yatsimirsky, Anatoly K.,Lehn
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p. 979 - 985
(2007/10/03)
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- Coordination Behaviour of Biologically Active Schiff Bases of Amino Acids Towards Stannous Ion
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Reaction of tin(II) methoxide with Schiff bases derived by condensation of 2-hydroxy-1-naphthaldehyde, salicylaldehyde with glycine, β-alanine, α-valine, α-iso-leucine and α-tryptophan in 1:1 molar ratio gives a new series of tin(II) complexes. The comple
- Singh, H. L.,Sharma, M.,Gupta, M. K.,Varshney, A. K.
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p. 103 - 110
(2007/10/03)
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- New Biologically Active Aromatic Derivatives of Fatty Acids
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A convenient method for synthesizing the homologous series of new aromatic derivatives of fatty acids is described.The synthetic approach includes the reductive alkylation of ω- and α-amino acids with hydroxybenzaldehydes.The physicochemical properties of
- Lurie, E. Yu.,Kaplun, A. P.,Kulakov, V. N.,Shvets, V. I.
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p. 264 - 268
(2007/10/02)
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- Synthesis and Physicochemical Properties of Schiff Bases of Amino Acids with Salicylaldehyde
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A series of the Schiff bases of α- and ω-amino acids with salicylaldehyde was synthesized.The physicochemical properties of the substances obtained, including the fluorescent characteristics, were examined, and the hydrolysis constants at pH 6.0, 7.0, and 8.0 were determined.Key words: amino acids, hydroxybenzaldehyde, Schiff bases, fluorescence, hydrolysis constant
- Lurie, E. Yu.,Mosina, E. M.,Efremova, A. A.,Kaplun, A. P.,Shvets, V. I.
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p. 520 - 523
(2007/10/03)
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- Complexes of Cobalt(II) with Schiff Bases Derived from Salicylaldehyde and Some Amino Acids
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Complexes of cobalt(II) with schiff bases derived from salicylaldehyde and the amino acids, DL-2-aminobutyric acid, L-valine, β-alanine, 3-aminobutyric acid, 4-aminobutyric acid and L-methionine have been synthesised and characterised.Magnetic and spectral data indicate the complexes to be octahedral.
- Ramanujam, V. V.,Sivasankar, B.
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p. 749 - 751
(2007/10/02)
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