Pd（Ⅱ）与α－氨基肟配体PnAO配位反应的动力学研究

KINETIC STUDY OF THE COORDINATION REACTION BETWEEN Pd(Ⅱ) AND α-AMINOXIME LIGAND PnAO

本文用紫外可见分光光度法研究了Ｐｄ（Ⅱ）与ＰｎＡＯ生成配合物的反应动力学，测得了几个温度下的反应表观速率常数，提出了一个由螯合作用促进的多步反应机理，计算求得了速率控制步骤的反应速率常数和该步的活化参数，△Ｈ≠＝５７．５７ｋＪ·ｍｏｌ－１，△Ｓ≠＝－３４．２４Ｊ·ｍｏｌ－１·Ｋ－１。讨论了介质酸度和离子强度对反应速率的影响．

The kinetic study of the complex formation between Pd(Ⅱ) and PnAO was studiedspcctrophotometrically.A five-steps mechanism of chelation acceleration was proposed.Thefirst step is r.c.s..The activation parameters of this step were obtained,kJ.mol-1 mol-1.K-1.The influence of PH and ionic strength upon the reactionwas discussed.