摘要
在25℃,pH7.00的条件下,研究了希夫碱型大环多胺铜配合物对α-吡啶甲酸对硝基苯酚酯(PNPP)的催化水解反应,其表观速率常数为1.61×10-3s-1,是PNPP自发水解速率常数的88倍;同时研究了非离子表面活性剂Brij35、阳离子表面活性剂CTAB、阴离子表面活性剂SDS及pH值、温度、铜配合物浓度对催化水解反应的影响,用所建立的三元复合物(MmLlS)催化反应通用数学模型,计算出催化反应相应的热力学和动力学参数.结果表明,配体中活化的羟基作为亲核物种对羧酸酯有较强的亲核反应能力,能有效地促进PNPP的水解.
The hydrolysis of p-nitrophenyl picolinate （PNPP） catalyzed by Cu^2＋ complex of schiff bases macrocyclic polyamine is studied kinetically at 25℃ and pH7.00. The apparent rate constant of the catalytic hydrolysis of PNPP is 1.61×10^-3 s^-1, which is 88 times of that spontaneous hydrolysis of PNPP at pH7. 00. The effect of nonionic surfactant Brij35, cutionic surfactant CTAB, anionic surfactant SDS and pH, temperature, concentfition of Cu^2＋ complex on the hydrolysis of PNPP catalyzed by Cu^2＋ complexes of schiff bases macrocyclic polyamine is also studied in this paper. The thermodynamic and kinetic parameters of the above mentioned catalytic reactions are obtained with the mathematical model of the trinary complex MmL1S proposed in this paper. The results indicate that the activated hydroxyl group of the ligand is effective nucleophilic soecies, which can effectively accelerate the hvdrolvtic reactions.
出处
《四川师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第6期748-753,共6页
Journal of Sichuan Normal University（Natural Science）
基金
四川省教育厅自然科学重点基金(07ZS005)资助项目
