pH-metric, UV-Vis and 51V NMR study of vanadium(V) coordination to α-aminohydroxamic acids in aqueous solutions

被引：12

作者：

Miranda, C. T. ^{[1
]}

Carvalho, S. ^{[1
]}

Yamaki, R. T. ^{[2
]}

Paniago, E. B. ^{[1
]}

Borges, R. H. U. ^{[1
]}

De Bellis, V. M. ^{[1
]}

机构：

[1] Univ Fed Minas Gerais, Dept Chem, ICEx, Belo Horizonte, MG, Brazil

[2] Univ Estadual Sudoeste Bahia, Dept Chem, Jequie, BA, Brazil

来源：

POLYHEDRON | 2010年 / 29卷 / 02期

关键词：

Vanadium(V); alpha-Aminohydroxamic acid; NMR; Potentiometry; V-51; Speciation; SUBSTITUTED HYDROXAMIC ACIDS; DISSOCIATION-CONSTANTS KA; N-HYDROXYACETAMIDE; DELTA-HA; COMPLEXES; VANADATE; SPECTROSCOPY; DIPEPTIDES; CHEMISTRY; LIGAND;

D O I：

10.1016/j.poly.2009.10.020

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The full speciation of vanadium(V) complexation systems with glycinehydroxamic acid and three alpha-aminohydroxamic acids (alpha-alanine-, alpha-threonine- and alpha-lysine-) has been achieved using potentiometric and spectroscopic techniques. Formation constants were calculated in a systematic study at different concentrations and ligand-to-metal molar ratios. In each case, in a neutral medium, two complexes were identified with 1:1 and 1:2 metal-to-ligand ratios, both of which can either be protonated or deprotonated depending on the acidity or basicity of the medium. Structures are proposed based on V-51 NMR results. The 1:1 complex, VO2L (VO2+ = dioxovanadium(V) ion and L- = alpha-aminohydroxaniate ligand), has a distorted trigonal bipyramidal structure in neutral medium and it exists as VO2HL+ in acidic and as VO2(OH)L- in basic medium. The 1:2 complex, VO2H2L2+, which is formed in neutral medium, has an octahedral structure and also exists as VO2H3L22+ and VO2HL2, in acidic and basic media, respectively. In all cases, only the hydroxamate group appears to be coordinated to the VO2+ group. (c) 2009 Published by Elsevier Ltd.

引用

页码：897 / 903

页数：7

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