Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (01): 17-22.doi: 10.3866/PKU.WHXB201210121

• THERMODYNAMICS, KINETICS, AND STRUCTURAL CHEMISTRY • Previous Articles     Next Articles

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).

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