Complexes of vanadium(III) with aromatic amino acids and L-proline in aqueous solution

被引：10

作者：

Podsiadly, Halina ^{[1
]}

Karwecka, Zofia ^{[1
]}

机构：

[1] Univ Wroclaw, Fac Chem, PL-50383 Wroclaw, Poland

来源：

POLYHEDRON | 2009年 / 28卷 / 08期

关键词：

Vanadium(III); Stability constants; Amino acids; Speciation; IONIC-STRENGTH DEPENDENCE; L-HISTIDINE; FORMATION-CONSTANTS; L-CYSTEINE; OXOVANADIUM(IV); SYSTEMS; DIOXOVANADIUM(V); EQUILIBRIUM; PROTONATION; SPECIATION;

D O I：

10.1016/j.poly.2009.03.015

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The equilibria of the complexation processes of V3+ ion with L-phenylalanine, L-tyrosine, L-tryptophan and L-proline in aqueous solution were studied by potentiometric and spectroscopic (UV, Vis, CD) methods. The results indicate that all ligands (except L-tyrosine) form only 1: 1 species with vanadium(III) ion in the pH range about 2-5. More complex equilibria were observed in the vanadium(III)-L-tyrosine system. Only in this system relatively stable ML2 species predominantly exists in the pH range 3-5. The results of spectroscopic measurements indicate that in ML and ML2 species chelated bounds through O and N atoms appear in all investigated systems. Above pH 5 strong hydrolysis processes of vanadium(III) occurred. (C) 2009 Elsevier Ltd. All rights reserved.

引用

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页码：1568 / 1572

页数：5

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