一种同时测定多核配离子种类和稳定常数的简便方法

J4 ›› 2011, Vol. 24 ›› Issue (3): 27-31.

一种同时测定多核配离子种类和稳定常数的简便方法

李可群

同济大学化学系，上海 200092

收稿日期:2010-12-20 出版日期:2011-06-20 发布日期:2011-06-20
通信作者: 李可群(1968-)，男，硕士，讲师，主要研究方向为配位化学。 E-mail:likequn@hotmail.com

A simple method for simultaneously determining stiochiometry and stability constants of polynuclear complex

LI Ke-Qun

Department of Chemistry, Tongji University, Shanghai 200092, China

Received:2010-12-20 Online:2011-06-20 Published:2011-06-20

摘要/Abstract

摘要：

针对现有测定多核配合物稳定常数的方法大多较为复杂的情形，提出了一种利用多核配离子最大分布系数来测定稳定常数的新方法，本法原理和计算简单，无需编程，并可确定溶液中存在的多核配离子种类。文章使用溶液中金属离子总浓度对数值对自由金属离子浓度负对数和自由配体浓度负对数的一阶偏微分值以及因素轮换法来确定稳定常数测定时的实验条件。镍离子与三乙醇胺以及镍离子与乙醇胺两种多核配合物体系被用于验证本文公式，计算结果与真值一致。

关键词: 多核配合物, 稳定常数, 分布系数, 最大值, 斜率

Abstract:

To avoid the complexity of existing stability constant determination methods for polynuclear complexes, we presented a new determination method by using the maximum distribution coefficients of polynuclear complex ions. This method works with simple principle and calculation, needs no programming, and can determine the stoichiometry of polynuclear complex ions existing in solution. We employed the firstorder partial differentials, logarithmic value of total metal concentration in solution against negative logarithmic values of free metal concentration and that against free ligand concentration, and the factor alternation method to obtain experimental conditions for determining the stability constant.Computational results of two polynuclear complexes, which were used to verify the acquired formula, are in accordance with real values.

Key words: polynuclear complex, stability constant, distribution coefficient, maximum, slope

李可群. 一种同时测定多核配离子种类和稳定常数的简便方法[J]. J4, 2011, 24(3): 27-31.

LI Ke-Qun. A simple method for simultaneously determining stiochiometry and stability constants of polynuclear complex[J]. J4, 2011, 24(3): 27-31.