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Measurement of Low-temperature Heat Capacity and Standard Enthalpy of Formation of Praseodymium Glycin Perchlorate Complex
Wu Xinmin,Song Yongji*,Tan Zhicheng,Qu Songsheng
Author NameAffiliationE-mail
Wu Xinmin Department of Chemical Engineering, Beijing Institute of Petro chemical Technology, Beijing 102617  
Song Yongji* Department of Chemical Engineering, Beijing Institute of Petro chemical Technology, Beijing 102617 songyongji@bipt.edu.cn  
Tan Zhicheng Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023  
Qu Songsheng College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072  
Abstract:
The rare-earth perchlorate complex compound with DL-α-Glycin was synthesized. Its structure was characterized as [Pr2(DL-α-Gly)6(H2O)4](ClO4)6·5H2O by TG, DTA and chemical analysis, and the purity was 99.63 %. The melting point analysis experiment indicates that the complex has no stable melting point. The heat capacity of the complex was measured by a high-precise fully-automated adiabatic calorimeter from 79 to 371 K. No obvious abnormal heat capacity was observed within this low temperature range. The thermal decomposition temperature range of the complex was near 333 K. Its decomposition temperature, decomposition enthalpy and entropy were 320.010 K, 40.714 kJ/mol and 127.227 J/molK, respectively. The polynomial equation of heat capacity of this compound was simulated by the computer within the temperature range of 78.939~301.295 K. The standard enthalpy of formation was -8022.802 kJ/mol measured by isoperable reaction calorimeter at 298.15 K.
Key words:  Rare earth salt, DL-α-Glycin, [Pr2(DL-α-Gly)6(H2O)4](ClO4)6·5H2O, Low temperature heat capacity, Standard enthalpy of formation
FundProject:
镨甘氨酸高氯酸盐的低温热容和标准生成焓的测定
吴新民,宋永吉*,谭志诚,屈松生
摘要:
合成了一种稀土镨-DL-α-甘氨酸配合物高氯酸盐晶体.经热重、差热及元素的化学分析,确定其组成是[Pr2(DL-α-Gly)6(H2O)4](ClO4)6·5H2O,纯度是99.63%.熔点分析仪分析知其没有固定熔点. 在79~371 K,用高精密全自动绝热量热仪对晶体配合物进行了热容测定,发现该配合物在低温段没有反常热容. 333 K附近是该配合物的分解温区,配合物的分解温度、分解焓和分解熵分别是320.010 K、 40.714 kJ/mol和127.227 J/molK.计算机拟合了在78.939~301.295 K热容对温度的多项式方程. 在常压、 298.15 K下,用具有恒温环境的反应热量计测定了配合物的标准生成焓值为-8022.802 kJ/mol.
关键词:  稀土盐  L-甘氨酸  [Pr2(DL-α-Gly)6(H2O)4](ClO4)6·5H2O  低温热容  标准生成焓
DOI:10.1088/1674-0068/18/2/284-288
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