物理化学学报 >> 2013, Vol. 29 >> Issue (01): 17-22.doi: 10.3866/PKU.WHXB201210121

热力学,动力学和结构化学 上一篇    下一篇

Nd(Gly)2Cl3·3H2O和Pr(Ala)3Cl3·3H2O的热力学性质

刘北平1, 谭志诚2   

  1. 1 湖南文理学院化学化工学院, 湖南 常德 415000;
    2 中国科学院大连化学物理研究所热化学实验室,辽宁 大连 116023
  • 收稿日期:2012-07-23 修回日期:2012-10-12 发布日期:2012-12-14
  • 通讯作者: 谭志诚 E-mail:tzc@dicp.ac.cn
  • 基金资助:

    国家自然科学基金(20373072)和湖南省重点学科建设(应用化学)资助项目

Thermodynamic Properties of Nd(Gly)2Cl3·3H2O and Pr(Ala)3Cl3·3H2O

LIU Bei-Ping1, TAN Zhi-Cheng2   

  1. 1 College of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde 415000, Hunan Province, P. R. China;
    2 Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 110623, Liaoning Province, P. R. China
  • Received:2012-07-23 Revised:2012-10-12 Published:2012-12-14
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20373072) and Construct Program of the Key Discipline in Hunan Province, China (Applied Chemistry).

摘要:

利用精密自动绝热热量计测定了Nd(Gly)2Cl3·3H2O在80-357K和Pr(Ala)3Cl3·3H2O在80-374K温区的热容. 根据两个化合物的热容计算出了相对于参考温度298.15K的热力学函数(HT?H298.15)和(ST?S298.15). 根据热重(TG)分析结果, 提出了这两个稀土化合物可能的热分解机理. 利用溶解-反应恒温热量计测定相关化合物的溶解焓并设计盖斯热化学循环, 计算出了两个化合物的标准摩尔生成焓.

关键词: 稀土配合物, 绝热量热, 低温热容, 热力学函数, 热重分析, 溶解-反应恒温热量计, 标准摩尔生成焓

Abstract:

The heat capacities of rare earth complexes, Nd(Gly)2Cl3·3H2O and Pr(Ala)3Cl3·3H2O were measured with a high-precision automatic adiabatic calorimeter in the temperature range from 80 to 357 K for Nd(Gly)2Cl3·3H2O, and from 80 to 374 K for Pr(Ala)3Cl3·3H2O. The thermodynamic functions (HT?H298.15) and (ST?S298.15) relative to the reference temperature 298.15 K of the two compounds were calculated based on experimental heat capacity data. Possible mechanisms of thermal decompositions were proposed according to the thermogravimetric (TG) analysis. Based on the measurements of dissolution enthalpies using a solution-reaction isoperibol calorimeter, the standard molar enthalpies of formation were calculated in terms of a designed Hess thermochemical cycle.

Key words: Rare-earth complex, Adiabatic calorimetry, Low-temperature heat capacity, Thermodynamic function, Thermogravimetric analysis, Solution-reaction isoperibol calorimeter, Standard molar enthalpy of formation

MSC2000: 

  • O642