铜离子金属胶束介质中PNPA水解的动力学研究

Copper Cation Metallomicelle Mediated Hydrolysis of p-Nitrophenyl Acetate

研究了 2 5℃时 ,铜离子与二胺类配体DMEA和DMPA(DMEA为N ,N 二甲基乙二胺 ,DMPA为N ,N 二甲基 1,3 丙二胺 )形成的配合物对PNPA(对硝基苯酚乙酸酯 )催化水解的动力学 ,并通过了胶束催化的二元复合物动力学模型对其进行定量处理 ,结果表明 ,铜离子与不同的二胺类配体形成的配合物在CTAB胶束溶液中对PNPA的催化水解表现出不同的催化效果 。

The catalytic hydrolysis of p nitrophenyl acetate by copper ion complexes of diamine based ligands in CTAB micellar solution was investigated kinetically at 25℃. A binary complex kinetic model for metallomicellar catalysis was suggested to treat quantitatively the catalytic hydrolysis of p nitrophenyl acetate. The results indicated that copper ion complexes of diamine based ligands in CTAB micellar solution catalyze the hydrolysis of PNPA to different extent and the catalytic mechanism is believed to be that copper coordinated water deprotonizes to form the nucleophile for the nucleophilic attack.