Citation: Wang Kai, Gao Xiaohan, Lv Xuechuan, Tan Zhicheng, Cao Hui. Special Phase Transition under Low Temperature and Thermodynamic Properties of Rare Earth Complex Sm₂(Asp)₂(Im)₆(ClO₄)₆·6H₂O[J]. Chemistry, ;2016, 79(2): 141-146. shu

Special Phase Transition under Low Temperature and Thermodynamic Properties of Rare Earth Complex Sm₂(Asp)₂(Im)₆(ClO₄)₆·6H₂O

Wang Kai ¹ ,
Gao Xiaohan ¹ ,
Lv Xuechuan ^1,, ,
Tan Zhicheng ² ,
Cao Hui ¹

1.
1. School of Chemistry and Material Science, College of Chemical Engineering and Environmental, Liaoning Shihua University, Fushun, 113001;
2.
2. Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023

Corresponding author: Lv Xuechuan,
Received Date: 17 June 2015
Available Online: 26 August 2015
Fund Project:

A ternary complex of rare earth ion, Sm₂(Asp)₂(Im)₆(ClO₄)₆·6H₂O, was synthesized and its thermodynamic properties were studied. Molar heat capacities at constant pressure (C_p,m) of the complex were measured with a high-precision automatic adiabatic calorimeter over the temperature range from 80 to 390 K, and the thermodynamic functions (H_T-H_298.15 and S_T-S_298.15) were derived from the heat capacity data with temperature interval of 5 K. The phase transitions of the new complex around 220 K and 245 K were discovered both by adiabatic calorimetry and differential scanning calorimetry (DSC). The thermodynamic data of the phase transitions were calculated and the mechanism of phase transitions was deduced to be the reorientation process of perchlorate ions in the complex. Thermal stability of the complex was tested by thermogravimetric (TG) technique and a possible mechanism for the decomposition was suggested.
- Rare earth complexes,
- Solid-solid phase transition,
- Thermal stability,
- Adiabatic calorimetry,
- Heat capacity,
- Thermodynamic function
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Special Phase Transition under Low Temperature and Thermodynamic Properties of Rare Earth Complex Sm₂(Asp)₂(Im)₆(ClO₄)₆·6H₂O