N-十二烷基二乙醇胺-La^(3+)催化水解α-吡啶甲酸对硝基苯酚酯的动力学研究  

Kinetic Investigation on the Hydrolysis of PNPP Catalysed by La^(3+)-C_(16)H_(35)O_2N Complex

作　　者：刘凡[1] 徐森[1] 袁雪梅[1] 张元勤[1] 

机构地区：[1]乐山师范学院环境与生命科学,四川乐山614004

出　　处：《稀土》2006年第5期48-52,共5页Chinese Rare Earths

基　　金：四川省教育厅重点资助课题(01LA522003A157);乐山师院资助课题(20513)

摘　　要：建立了三元配合物MmLl催化反应的数学模型,并且以此方法获得催化反应的热力学和动力学参数。研究了在30±0.1℃,pH=7.10的条件下,L a(Ⅲ)配合物催化水解PNPP(α-吡啶甲酸对硝基苯酚酯)的动力学行为,以及表面活性剂B rij35和CTAB对该催化水解反应的影响,并用建立的数学模型获得了L a(Ⅲ)配合物催化水解PNPP的热力学和动力学参数。实验结果表明,在水解反应中配体活性的-OH是有效的亲核基团,使PNPP的水解速率增加,随着表面活性剂浓度的增大PNPP的水解速率变小。Mathematical model of the catalytic reaction of the ternery complex as MmL1S was proposed in this paper. The thermodynamic and kinetic parameters of the catalytic reaction can be obtained by this method. The hydrolysis of PNPP catalyzed by La^3＋ complex was studied kinetically at pH 7.10,T= 30±0.1℃. The effect of Brij35 and CTAB surfactants on the hydrolysis of PNPP catalyzed by La^3＋ complex was also studied. The thermodynamic and kinetic parameters of the above mentioned catalytic reactions were obtained by the mathematical model presented in the paper. The results indicated that the activated hydroxyl group of the ligand is effective nucleophilic species in the hydrolytic reactions. The results showed that the rate for the hydrolysis of PNPP were increased, which was caused by metal complex and the concentration effect of surfactant micelle is smaller catalyst for the hydrohytic cleavage of PNPP.

关 键 词：N-十二烷基二乙醇胺-La^3+ 配合物 PNPP 催化水解 

分 类 号：O643[理学—物理化学]