N-甲基二乙醇胺金属配合物催化水解α-吡啶甲酸对硝基苯酚酯的动力学

Kinetic investigation on the hydrolysis of PNPP catalysed by N-Methy1 diethanolamine metal comp1exes

建立了MmL1S型三元复合物催化反应通用的数学模型 ,获得了催化反应有关的热力学和动力学参数 ,考察了 30℃ ,pH 7 0 0、N 甲基二乙醇胺Ni2 + ,Zn2 + ,Co2 + 配合物对α 吡啶甲酸对硝基苯酚酯 (PNPP)水解反应的催化作用 ,以及非离子表面活性剂Brij 35对催化水解反应的影响 ,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 ,金属离子活性的大小顺序为Ni2 + >Zn2 + >Co2 + 。

The mathematical model of the catalytic reaction of the ternery complex as M_mL_1S was proposed in this paper.With this method the thermodynamic and thermodynamic parameters of the catalytic reaction can be obtained.The hydrolysis of p-nitropheny1 picolinate(PNPP)catalyzed by Ni^(2+),Zn^(2+),Co^(2+) complexes was studied kinetically at pH7.00,T=30±0.1℃.The effect of Brij35 surfactant on the hydrolysis of p-nitrophenyl picolinate(PNPP) catalyzed by Ni^(2+),Zn^(2+) complexes was also studied in this paper.The thermodynamic and thermodynamic parameters of the above-mentioned catalytic reactions were obtained with the mathematical model presented in this paper.The results indicated that the activated hydroxyl group of the ligand is effective nucleophilic species in the hydrolytic reactions.The activity of the metal ions decreased in the order of Ni^(2+)>Zn^(2+)>Co^(2+).