摘要
近年来,胶束体系中无机反应动力学的研究逐渐增多,已有工作中较多且较有系统地研究的是金属离子与配体形成络合物的反应.我们在前文中曾报导过SDS胶束体系中Ni(Ⅱ)与偶氮染料及Ni(Ⅱ)、Co(Ⅱ)与联吡啶络合物形成的反应动力学.本文考察了三联吡啶与Ni(Ⅱ)在水溶液中反应的动力学及SDS胶束存在的影响.三联吡啶是一中性三啮配体,水溶液中Ni(Ⅱ)-Terpy反应的动力学已有研究,这些研究表明,此络合反应遵从Eigen-Wilkins机理.
The kinetic parameters of complex formation between Ni ( Ⅱ ) and a neutral terdentate ligand-2, 2', 2' Terpyridyl ( Terpy. ) were determined by Stopped-Flow technique at several temperatures, and the effect of the presence of SDS micelle was investigated.The results show that in SDS micellar solution under pseudo-first order condition the rate-determining step of the above reaction is the release of first water molecule from the inner coordination sphere, and the kinetics follows the Eigen ?wilkins mechanism, as in aqueous solution.
Comparing with the kinetics in the absence of the micelle,the apparent rate constant of complex formation kf is about 50 times larger in SDS micellar system, suggesting significient micellar catalytic effect.
From the rate constants at different temperatures, the apparent activation energy of the reaction were also estimated.
出处
《分子催化》
EI
CAS
CSCD
1989年第3期247-251,共5页
Journal of Molecular Catalysis(China)
