Effect of organised surfactant systems on the kinetics of metal–ligand complex formation and dissociation
Effect of organised surfactant systems on the kinetics of metal–ligand complex formation and dissociation
复制标题
有组织的表面活性剂体系对金属-配体络合物形成和解离动力学的影响
DOI：
10.1039/f19848002417
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
B. Robinson
中科院分区：
文献类型：
--
作者：
P. Fletcher;B. Robinson
在水、十二烷基硫酸钠胶束溶液和气溶胶-OT稳定的油包水微乳液中，研究了一系列金属-配体络合反应的动力学和机理。建立了解释这些分散体系中的动力学测量的一般理论，并对金属络合物的形成进行了检验。在大多数情况下，络合物的形成速度只受表面活性剂/水界面对反应物的浓度增强效应的影响。由此可以推算出溶液中可供反应的体积，从而得到合理的值。Ni(Phen)2+与PADA的反应动力学受其他因素的影响。因此，可以研究发生反应的胶束表面的性质。对于配体PAN，有证据表明它可以在两个以上的伪相之间进行分配，从而降低络合物的形成速度。与主体水相比，络合物在界面上的解离速率提高了10倍。
The kinetics and mechanism of a range of metal–ligand complexation reactions have been studied in water, sodium dodecylsulphate micellar solutions and aerosol-OT-stabilised water-in-oil microemulsions. A generalised theory is developed for the interpretation of kinetic measurements in these dispersions and it is tested for metal-complex formation. In most cases the rate of complex formation is only affected by the concentration-enhancement effect of the surfactant/water interface on the reactants. Then the volume within the solution available for reaction can be deduced and reasonable values are obtained. For the reaction between Ni(phen)2+ and PADA, other factors influence the kinetics. As a result the nature of the micelle surface where reaction occurs can be investigated. For the ligand PAN there is evidence that it can partition between more than two pseudo-phases, with a consequent reduction in the rate of complex formation. The dissociation rates of the complexes at the interfaces are increased by up to a factor of ten as compared with bulk water.