Determination of stability constants for metal-ligand complexes using the voltammetric oxidation wave of the anion/ligand and the DeFord and Hume formalism

被引:12
作者
Luther, GW [1 ]
Theberge, SM
Rickard, D
机构
[1] Univ Delaware, Coll Marine Studies, Lewes, DE 19958 USA
[2] Cardiff Univ, Dept Earth Sci, Cardiff CF1 3YE, S Glam, Wales
基金
美国国家科学基金会;
关键词
metal-ligand complexes; anion/ligand; voltammetric oxidation;
D O I
10.1016/S0039-9140(99)00234-9
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The voltammetric oxidation peaks for anions and other ligands that react at the Hg electrode can be used for the determination of stability constants of metal-ligand complexes using the DeFord and Hume formalism. Metal-ligand complexes with known stability constants that span the range of log beta = 2.9-5.9 were determined using the oxidation wave of the ligand as metal was varied. For the larger stability constants, it was possible to titrate concentrations of metal to ligand that are smaller than the ligand concentration and obtain reliable data (beta(j)C(x)(j) approaches 1 in this case) indicating that an excess of titrant is not required to obtain reliable beta values. Data reduction with different versions of the Solver tool (included with Microsoft Excel) is discussed and blind use of these programs without knowledge of the physical chemistry of the system is discouraged. The use of Solver gives beta values that are in agreement with previous work that used (non)linear regression to evaluate each F-n(X) versus [X] function. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:11 / 20
页数:10
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