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在Brij35胶束溶液中,比较研究了四氮大环席夫碱(5,7,7,12,14,14-六甲基-1,4,8,11-四氮杂十四环-二烯,L)的钴?配合物1催化对硝基苯酚吡啶甲酸酯(PNPP)及对硝基苯酚乙酸酯(PNPA)水解的动力学。结果表明:配合物1对PNPP及PNPA的催化作用具有酸碱催化的特征,催化活性物种为与金属离子结合的氢氧根离子CoL-OH-;配合物1催化PNPP水解的速度远远大于其催化PNPA水解的速度,在pH7.40、30℃时,表观二级速率常数kc分别为0.997mol-1·L·s-1和1.12×10-3mol-1·L·s-1,这种反应速率的差异可归因于反应机理的不同;Brij35胶束对PNPP及PNPA的水解均有抑制作用。
In Brij35 micellar solution, a comparative study of four nitrogen ring Schiff base (5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazatetracyclohepta-bis Alkene, L) catalyzed the hydrolysis of p-nitrophenyl picolinate (PNPP) and p-nitrophenol acetate (PNPA). The results showed that the catalytic effect of complex 1 on PNPP and PNPA was acid-base catalyzed. The catalytically active species was hydroxide ion CoL-OH- bound to metal ions. The rate of PNPP hydrolysis catalyzed by complex 1 was far greater than that of complex 1 The apparent second-order rate constants kc were 0.997 mol-1 · L · s-1 and 1.12 × 10-3 mol-1 · L · s-1, respectively, at pH7.40 and 30 ℃ The differences in the reaction rates can be attributed to different reaction mechanisms; Brij35 micelles have an inhibitory effect on the hydrolysis of PNPP and PNPA.