Study of Complexes of Lanthanum with Amino Acids by Titration Calorimeter

作     者：Ye Gang, Wang Cun-xin, Qu Song-sheng College of Chemistry and Environment Science, Wuhan University, Wuhan 430072, China 

作者机构：College of Chemistry and Environment ScienceWuhan UniversityWuhan 430072China 

出 版 物：《Wuhan University Journal of Natural Sciences》 (武汉大学学报（自然科学英文版）)

年 卷 期：2000年第5卷第4期

页      面：479-484页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0703[理学-化学] 

基　　金：Supported by the National Nature Science Foundation of China(29873036) 

主　　题：titration calorimeter rare earth amino acid complexes steric effects 

摘      要：The stability constants and thermodynamic functions for complexes of lanthanum with eight kind of amino acids according to 1∶1 and 1∶2 in proportion have been determined by titration calorimeter at 298.15 K. The enthalpy change makes a predominant contribution to the stability of these complexes. The ring in amino acid associated with lanthanum ion helps to enhance the stability of complexes. Steric effects between rings in complexes leads to that the equilibrium constants of reaction of the complexes (1∶2) is much less than that of the complexes (1∶1).