Kinetic Study on Carboxylic Ester Hydrolysis Catalyzed by the Metallomicelle Made up of Macrocyclic Schiff Base Complex

Two transitional metal ion macrocyclic Schiff base complexes,NiL and CuL were synthesized and characterized,and the metallomicelles made up of the nickel(II) and copper(II) complexes and surfactants(LSS,CTAB),as mimic hydrolytic metalloenzyme,were used in catalytic hydrolysis of carboxylic ester(PNPP).The analysis of specific absorption spectrums of the hydrolytic reaction systems indicates that key intermediates,made up of PNPP and Ni(II) or Cu(II) complexes,have formed in the reaction processes of the PNPP catalytic hydrolysis.In this,based on the analytic result of specific absorption spectrum,the mechanism of PNPP catalytic hydrolysis has been proposed;a kinetic mathematical model,applied to the calculation of the kinetic parameter of PNPP catalytic hydrolysis,has been established on the foundation of the mechanism proposed;structure effect of the complexes and effects of micelle on the rate of PNPP hydrolysis catalyzed by the complexes have also been discussed.