Ho(NO3)3(C2H5O2N)4·H2O的低温热容和热力学函数

引用本文: 高肖汉, 徐培, 段文超, 吕雪川, 谭志诚, 鲁强. Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O的低温热容和热力学函数[J]. 物理化学学报, 2013, 29(10): 2123-2128. doi: 10.3866/PKU.WHXB201306051 shu

Citation: GAO Xiao-Han, XU Pei, DUAN Wen-Chao, LÜ Xue-Chuan, TAN Zhi-Cheng, LU Qiang. Low-Temperature Heat Capacity and Thermodynamic Functions of Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O[J]. Acta Physico-Chimica Sinica, 2013, 29(10): 2123-2128. doi: 10.3866/PKU.WHXB201306051 shu

Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O的低温热容和热力学函数

高肖汉 ^1, ,
徐培 ^1, ,
段文超 ^1, ,
吕雪川 ^1, ,
谭志诚 ^2, ,
鲁强 ^1,

基金项目:
国家自然科学基金(21103078, 21003069)资助项目 (21103078, 21003069)

摘要:

合成了稀土(钬, Ho)-氨基酸(甘氨酸, C₂H₅O₂N)二元配合物Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O, 并且通过化学分析、元素分析和红外(IR)光谱对配合物进行了表征. 用高精度全自动绝热量热仪, 测定了该配合物在80-390 K温度区间的定压摩尔热容(C_p,m). 利用实验测定的热容数据, 采用最小二乘法, 将热容曲线上热容峰以外的两段平滑区的摩尔热容对折合温度进行拟合, 建立了热容随折合温度变化的多项式方程. 根据热容与焓、熵的热力学关系,计算出了配合物在80-390 K温度区间内,每隔5 K,相对于298.15 K的摩尔热力学函数(H_T,m-H_298.15,m)和(S_T,m-S_298.15,m). 通过热容曲线分析, 计算出了350 K附近转变过程的焓变(Δ_trsH_m)和熵变(Δ_trsS_m). 用差示扫描量热法(DSC)测定了配合物的热稳定性.

关键词:

English

Low-Temperature Heat Capacity and Thermodynamic Functions of Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O

1.
1 School of Chemistry and Material Science, College of Chemistry and Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning Province, P. R. China;
2 Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, Liaoning Province, P. R. China
Received Date: 15 March 2013
Available Online: 26 September 2013
Fund Project:
国家自然科学基金(21103078, 21003069)资助项目

Abstract:

A complex of a rare-earth metal (Ho) nitrate with glycine (C₂H₅O₂N), Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O, was synthesized, and characterized by chemical analysis, elemental analysis, and infrared (IR) spectroscopy. The thermodynamic properties of the complex were also studied. The low-temperature molar heat capacities at constant pressure (C_p,m) of the complex were measured using a high-precision automatic adiabatic calorimeter over the temperature range from80 to 390 K. The experimental molar heat capacities at constant pressure were used to deduce the polynomial equations for the heat capacity as a function of reduced temperature by applying the least-squares method to the two smooth stages of the curve. Based on the thermodynamic relationships among heat capacity, entropy, and enthalpy, the thermodynamic functions (H_T,m-H_298.15,m) and (S_T,m-S_298.15,m) were derived from the heat capacity data, with temperature intervals of 5 K. The molar enthalpy and entropy changes of the transition process at about 350 K (Δ_trsH_m and Δ_trsS_m) were calculated from the heat capacity curve. The thermal stability of the complex was determined using differential scanning calorimetry (DSC).

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O的低温热容和热力学函数

English

Low-Temperature Heat Capacity and Thermodynamic Functions of Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O

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