稀土氨基酸配合物RE(Val)Cl_3·6H_2O(RE=Nd, Sm)的热分解动力学

Thermal Decomposition Kinetics of Complexes of Rare Earth with Amino Acid RE(Val)Cl_3·6H_2O (RE=Nd, Sm)

合成了稀土氨基酸配合物晶体——三氯化缬氨酸六水合钕、钐,对合成样品进行了EDTA滴定、元素分析、红外光谱分析、热重、差热分析以及熔点测定,推测了配合物的热分解机理,采用Achar法和Coats-Redfern法研究了配合物热分解的非等温动力学过程,给出了各配合物样品失水阶段第一步反应和氨基酸骨架断裂阶段第一步反应的活化能(E)、指前因子的对数值(lnA)及热分解反应动力学方程式.

Two complex compounds of rare earth with valine, monovalino-hexaquo-neodymium and monovalinohexaquo-samarium, were synthesized, and their properties were determined by EDTA titration, element analysis, infrared spectrum, thermogravimetry, differential thermal analysis and melting point measurement. The thermal decomposition mechanism had been deduced, and non-isothermal kinetics of the thermal decomposition of the complexes had also been studied by the methods of Achar and Coats-Redfem. The activation energies and the pre-exponential factors in the kinetics equations of two reactions, the first step of the water-loss process and the first step of the bond breaking process of the amino acid skeleton, were obtained.