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
收藏
页码：897 / 903
页数：7
相关论文
共 37 条
  • [31] A robust calculation approach applied to the evaluation of hydrogen ion concentrations through potentiometric measurements in aqueous solutions.
    Suyama, E
    Paniago, EB
    Carvalho, S
    Couto, BRGM
    [J]. QUIMICA NOVA, 2001, 24 (01): : 5 - 9
  • [32] THIELE H, 1994, MANUAL 1D WIN NMR
  • [33] Applications of 51V NMR spectroscopy to studies of the complexation of vanadium(V) by α-hydroxycarboxylic acids
    Tracey, AS
    [J]. COORDINATION CHEMISTRY REVIEWS, 2003, 237 (1-2) : 113 - 121
  • [34] VANADIUM(V) OXYANIONS - INTERACTIONS OF VANADATE WITH OXALATE, LACTATE, AND GLYCERATE
    TRACEY, AS
    GRESSER, MJ
    PARKINSON, KM
    [J]. INORGANIC CHEMISTRY, 1987, 26 (05) : 629 - 638
  • [35] Thermodynamics, kinetics, and mechanism of the stepwise dissociation and formation of tris(L-lysinehydroxamato)iron(III) in aqueous acid
    Wirgau, JI
    Spasojevic, I
    Boukhalfa, H
    Batinic-Haberle, I
    Crumbliss, AL
    [J]. INORGANIC CHEMISTRY, 2002, 41 (06) : 1464 - 1473
  • [36] Interaction of N-hydroxyacetamide with vanadate in aqueous solution
    Yamaki, RT
    Paniago, EB
    Carvalho, S
    Howarth, OW
    Kam, W
    [J]. JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, 1997, (24): : 4817 - 4821
  • [37] Interaction of 2-amino-N-hydroxypropanamide with vanadium(V) in aqueous solution
    Yamaki, RT
    Paniago, EB
    Carvalho, S
    Lula, IS
    [J]. JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, 1999, (24): : 4407 - 4412
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