稀土与双偶氮变色酸反应系列的动力学和机理特征  

The Kinetics and Mechanism Characteristic for a series of Reactions between Rare Earth and Bisazo Chromotropic Acid

作　　者：林智信[1] 安从俊[1] 杨林[1] 陈丹华[1] 王丽莎 方贤安[1] 

机构地区：[1]武汉大学化学系

出　　处：《化学学报》1990年第11期1064-1070,共7页Acta Chimica Sinica

基　　金：国家自然科学基金

摘　　要：本文在前报基础上,对稀土与双偶氮变色酸配合物反应选用了一系列体系进行了较系统的动力学研究。实验获得速率方程的通式为:r=k·[RE(H_2O)_m^(3+)][H_6R]~β[H_3O^+]^(-1),β=1或2。实验活化能分别处在40—70kJ·mol^(-1)之间。根据速率方程所确定的速控步骤过渡态的组成,参照Eign-Tamm机理,它们可能遵循两种不同机理,一种是配合物失水作为速控步骤,一种是质子转移作为速控步骤。动力学处理导出的方程与经验速率方程获得满意的吻合。On the basis of previous works, We selected and systematically studied the kinetics behaviours of a series of coordination reactions between rare earth and bisazo chromotropic acid. The common formula of rate law is r=k(RE[H_2O)_m^(3+)) (H_6R)~尾 (H_3O^+)^(-1), where 尾=1 or 2. Their Arrhenius activation energies are among 40鈥0 kJ/mol. According to the composition of transition state of rate determining step from rate law and referring to Eigen-Tamm mechanism, two types of mechanism, i.e. the dehydration step of coordination complex and the proton transfer step, are proposed. The rate equation obtained from either machanisms is in conformity with its rate law.

关 键 词：稀土 双偶氮变色酸 反应动力学 

分 类 号：O614.33[理学—无机化学]