β－型配合物稀释溶液吸光度法分析──稀土－对马尿酸偶氮氯膦的组成与稳定常数的测定

Analysis of β-Type Chelate by Dissociation Degree Ratio Method 一Determination of Stability Constant and Composition of Rare Earths with p-Hippuroxhlorophosphonazo

利用溶液的稀译度与其吸光反的关系，导出一个适用测定β－型配合物组成及稳定常数的方法。根据实验数据，用图解法求出稀土β－型配合物的实际组成为３：３．同时给出了其表观稳定常数，讨论了β－型配合物与稀土离子半径、电子结构和公型配合物稳定性的关系。

his paper attempts to carry out investigation on the actual combining ratio and apparentstability constants of β-type homonuclear complexes which lanthanides incorporate with p-hip-purochlorophosphonazo. The method based on the effect of dilution on the degree of dissociation has beenapplied. The actual combining ratio of chelates is determined to be 3:3 by a graphical method as pro-posed in the paper. Meanwhile, the apparent stability constants of them are calculated meticulously.