含Cr(Ⅲ)溶液中配位水质子的~1H NMR研究

THE STUDY OF ~1H NMR ON THE PROTONS IN SOLUTION CONTAINING Cr(Ⅲ)

本文用~1H NMR对水合Cr(Ⅲ)络离子中配位水和质子交换速率进行研究。在溶液pH为0～3.17范围测得质子的平均寿命约为10^(-5)S。在pH为0～0.76范围质子交换反应动力学为一、二级混合过程。pH为0.76～1.6范围表现为一级过程。在Cr(Ⅲ)-H_2O-Gly系统中,实验得出配位水质子的活动性减小。

A study of the exchange process between the protons in a hydrated Cr(Ⅲ) ion and bulk was made with 1H NMR. In the region of pH = 0- 3.17, the average lifetime of the protons in hydration sphere is of 10s order. There is a dynamic exchange process of protons with a mixture of first and second-order in pH=0-0.76 and only first order in pH = 0.76-1.6. In system of Cr(Ⅲ) -H2O-Gly, it was found that the protons in hydration sphere have activity weaken.