吲哚-3-乙酸与部分过渡金属离子M(II)二元配合物的pH电位法研究

Studies on the binary complexes of some transition metals with indolyl-3-acetic acid by potentiometry

在25℃,I=0.10 mol/L KNO3的实验条件下,用pH电位法测定了吲哚-3-乙酸(IAA)在甲醇-水混合溶剂中的质子化常数,讨论了有机溶剂对质子化常数的影响,结果表明在实验范围内溶剂甲醇含量对质子化常数的影响呈线性关系。确定了二元体系M(II)-IAA(M=Fe、Co、Ni、Cu、Zn和Cd)在甲醇含量为50%(V/V)的混合溶剂中主要存在的配合物物种,并测定了配合物的稳定常数。实验数据的处理运用计算机程序Hyper-quad、Glee和Hyss完成。

Under the given conditions （25 = ℃,I = 0. 1 0 mol/L KNO3 ）, the protonation constants of ligand indolyl-3-acetic acid （IAA） had been studied by precise potenfiometry in mixed solvent of methanol and water. The effect of methanol content on the ligand protonation constants was discussed. The results showed that there is a linear relationship between the methanol content and protonation content. For the binary system M（Ⅱ）-IAA（ M = Fe,Co,Ni,Cu,Zn,Cd） ,the complexes species as well as their stability constants were determinated in mixed sovent with 50% methanol content. The experimental data was calculated by employing programs Hyperquad , Glee, and Hyss.