物理化学学报 >> 2008, Vol. 24 >> Issue (08): 1378-1382.doi: 10.3866/PKU.WHXB20080809

研究论文 上一篇    下一篇

Sm(Val)Cl3·6H2O低温热容及热化学性质

张景楠; 谭志诚; 刘北平; 史全; 童波   

  1. 中国科学院大连化学物理研究所材料热化学实验室, 辽宁 大连 116023; 湖南文理学院化学化工系, 湖南 常德 415000; 中国科学院研究生院, 北京 100049
  • 收稿日期:2008-03-04 修回日期:2008-03-19 发布日期:2008-08-06
  • 通讯作者: 谭志诚 E-mail:tzc@dicp.ac.cn

Low-Temperature Heat Capacities and Thermochemistry Properties of Sm(Val)Cl3·6H2O

ZHANG Jing-Nan; TAN Zhi-Cheng; LIU Bei-Ping; SHI Quan; TONG Bo   

  1. Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China; Department of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde 415000, Hunan Province, P. R. China; Graduate School of the Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2008-03-04 Revised:2008-03-19 Published:2008-08-06
  • Contact: TAN Zhi-Cheng E-mail:tzc@dicp.ac.cn

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摘要： 采用精密绝热量热计测定了稀土氨基酸配合物[Sm(Val)Cl3·6H2O]在80-376 K温区的热容, 从实验热容值计算出了热力学函数(HT-H298.15和ST-S298.15). 在308 K附近, 配合物的热容出现一个大的跳跃, 可能是其玻璃化转变所致. 对该配合物进行热重测试, 得到了其可能的分解机理.

关键词: 稀土配合物, Sm(Val)Cl3·6H2O, 低温热容, 热力学函数, 热重分析

Abstract: Heat capacities of the complex of rare-earth element with valine [Sm(Val)Cl3·6H2O] were measured with a high-precision automatic adiabatic calorimeter over the temperature range from 80 to 376 K, and the thermodynamic unctions (HT-H298.15 and ST-S298.15) were calculated. A large step in heat capacity was detected around 308Kand this may be attributed to a glass transition corresponding to freezing of structural disorder. Thermal decomposition of this complex as studied by thermogravimetric (TG) technique and a possible mechanism for the decomposition was suggested.

Key words: Rare-earth complex, Sm(Val)Cl3·6H2O, Low-temperature heat capacity, Thermodynamic functions, TG analysis

MSC2000: 

  • O642