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化学学报
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化学学报 ›› 2001, Vol. 59 ›› Issue (9): 1396-1400. 上一篇    下一篇

研究论文

稀土高氯酸盐-甘氨酸配合物[Sm2(Gly)6(H2O)4](ClO4)6·5H2O单晶 体的低温热 容及标准生成焓

吴新明;刘义;李琳;刘平;高秀英;谭志诚;屈松生   

  1. 武汉大学化学与分子科学学院;中国科学院大连化学物理研究所.大连(116012)
  • 发布日期:2001-09-15

Low-temperature heat capacity and standard enthalpy of formation of samarium glycine perchlorate complex [Sm2(Gly)6(H2O)4](ClO4)6·5H2O

Wu Xinming;Liu Yi;Li Lin;Liu Ping;Gao Xiuying;Tan Zhicheng;Qu Songsheng   

  1. Dalian Inst Chem Phys, CAS.Dalian(116012)
  • Published:2001-09-15

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合成了稀土高氯酸盐-甘氨酸配合物晶体。经热重、差热、化学化析及有关文献对比，确定其组成是[Sm2(Gly)6(H2O)4](ClO4)6·5H2O,单晶结构，纯度是99.0%.熔点分析仪分析知其没有固定熔点，在79～370K温区，用高精密全自动绝热量仪对单晶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。348.07K附近是该配合物的分解温区，配合物的分解温度、分解熵和分解焓分别是346.89K,44.669kJ/mol和128.77J/K·mol。计算机拟合了热容对温度的多项式方程，在79～318K温区，Cp=1294.56+624.17K-11.893X^2+75.075X^3+23.762X^4.在常压，298.15K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-8022.405kJ/mol。

关键词: 高氯酸盐, 甘氨酸, 钐络合物, 比热, 生成焓

Rare-earth perchlorate-glycine complex [Sm2(Gly)6(H2O)4] (ClO4)6· 5H2O was synthesized and obtained as single crystals. By using TG, DTA and chemical analytic method, and comparing with relavent literature, its single crystal structure was established. The purity was found to be 99.0%, with no distinct melting point. Heat capacity measurement of this compound was carried out on a high-precise fully- automated adiabatic calorimeter over the temperature range from 79 to 370K. No obvious thermal anomaly was observed. Thermal decomposition temperature range of this compound is near 348.07K, its decomposition temperature, decomposition enthalpy and entropy are 346.89K, 44.669 kJ/mol and 128.77J/K·mol, respectively. The polynomial equation of heat capacity of this compound has ve fitted as : Cp=1294.56K+624.17X- 11.893X^2 +75.075X^3+23.762X^4 in the temperature range of 79～318K. The standard enthalpy of formation was measured to be - 8022. 405kJ/mol with isoperable reaction calorimeter at 298.15K.

Key words: PERCHLORATE, GLYCINE, SAMARIUM COMPLEX, SPECIFIC HEAT, ENTHALPY OF FORMATION

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