La(Ⅲ)配合物催化磷酸酯水解动力学研究  

Phosphate esters hydrolysis catalyzed by lanthanum(Ⅲ)complexes

作　　者：蒋维东[1] 蒋炳英[1] 林竹修[2] 臧蓉蓉[1] 胡常伟[1] 曾宪诚[1] 

机构地区：[1]四川大学化学学院,四川成都610064 [2]四川理工学院化学系,四川自贡643000

出　　处：《化学研究与应用》2004年第3期340-342,345,共4页Chemical Research and Application

摘　　要：实验合成了单核镧和异双核的铜镧配合物 ,并研究了 35℃时在 5 0 %二甲亚砜水溶液中催化磷酸二酯(bis(p nitropheny1phosphate) (BNPP) )水解的动力学。结果表明 ,这两种配合物均能有效地催化BNPP的水解 ;得到的pH～速率曲线图呈钟形 ;但不同的配合物表现出不同的催化活性 ;单核的La(Ⅲ )配合物比异双核的Cu(Ⅱ )La(Ⅲ )配合物能更有效地催化BNPP的水解 ,这很可能是由于底物对催化剂的空间需要不同造成的。本文运用相应的动力学模型处理得到了相关的动力学和热力学参数。The hydrolysis of bis(p-nitropheny1 phosphate)(BNPP)was greatly enhanced by the mononuclear La(Ⅲ)[(N,N'-bis(3-carboxy1)-2-hydroxysalicylidene)ethylenediamine]and the hetero-dinulcear Cu(Ⅱ)La(Ⅲ)[(N,N'-bis(3-carboxy1)-2-hydroxysalicylidene)ethylenediamine]complexes at 35℃ in 50% aqueous dimeth1 sulfoxide(DMSO)solutions.The results indicated that the mononuclear La(Ⅲ)complex showed relatively higher catalytic function on BNPP hydrolysis than that of the heterodinuclear Cu(Ⅱ)La(Ⅲ)complex,and this case was dissected by the spacer requirements for BNPP hydrolysis.In addition,the corresponding kinetic model was employed for kinetic treatment to obtain the relative thermodymanic and kinetic parameters.

关 键 词：镧配合物 磷酸酯 水解反应 动力学 催化活性 底物 

分 类 号：O623.627[理学—有机化学]