Yan Xiang, Xiancheng Zeng, Siqing Cheng, Yantuan Li, Jiaqing Xie
Department of Chemistry, Sichuan University, Chengdu, 610064, People's Republic of China
J Colloid Interface Sci. 2001 Mar 1;235(1):114-118. doi: 10.1006/jcis.2000.7357.
The catalytic hydrolysis of p-nitrophenyl picolinate (PNPP) by Cu(II) and Zn(II) complexes coordinating tripeptide were studied kinetically by observing the rates of release of p-nitrophenol in the buffered micellar solution at 25 degrees C and different pH values. The experimental results indicate that 1 : 2 ligand : metal ion complexes in CTAB micellar solution are the active species in the reaction, and the complexes, especially that with Cu(II), efficiently catalyze the hydrolysis of PNPP. As a result, a kinetic model of binuclear metal complex catalysis involving a ternary complex in CTAB micellar solution is proposed to analyze the kinetic behavior of catalysis, and thus, relative kinetic and thermodynamic parameters are obtained. The results predict that the catalytic reaction by metallomicelle with binuclear complex involves a bifunctional mechanism. Copyright 2001 Academic Press.
通过在25℃和不同pH值的缓冲胶束溶液中观察对硝基苯酚的释放速率，对配位三肽的铜（II）和锌（II）配合物催化水解对硝基苯基吡啶甲酸酯（PNPP）进行了动力学研究。实验结果表明，CTAB胶束溶液中1:2的配体:金属离子配合物是反应中的活性物种，这些配合物，尤其是与铜（II）形成的配合物，能有效催化PNPP的水解。因此，提出了一种涉及CTAB胶束溶液中三元配合物的双核金属配合物催化动力学模型来分析催化动力学行为，从而获得了相关的动力学和热力学参数。结果预测，双核配合物金属胶束的催化反应涉及双功能机制。版权所有2001年学术出版社。
