Citation: ZHANG Guo-Chun, ZHOU Chun-Sheng, GAO Sheng-Li. Low Temperature Heat Capacities and Standard Molar Enthalpy of Formation of the Coordination Compound Zn(Met)3(NO3)2·H2O(s)(Met=L-α-Methionine)[J]. Acta Physico-Chimica Sinica, 2013, 29(10): 2129-2134. doi: 10.3866/PKU.WHXB201309101
配位化合物Zn(Met)3(NO3)2·H2O(s)(Met=L-α-蛋氨酸)的低温热容及标准摩尔生成焓
利用精密绝热热量仪测定了化合物配合物Zn(Met)3(NO3)2·H2O (s) (Met=L-α-蛋氨酸)在78-371 K温区的摩尔热容. 通过热容曲线解析, 得到了该配合物的起始脱水温度为TD=325.10 K. 将该温区的摩尔热容实验值用最小二乘法拟合得到了摩尔热容(Cp)对约化温度(T)的多项式方程, 由此计算得到了配合物的舒平热容值和热力学函数值. 基于设计的热化学循环, 选择100 mL of 2 mol·L-1 HCl为量热溶剂, 利用等温环境溶解-反应热量计, 得到了298.15 K配合物的标准摩尔生成焓为ΔfHm0[Zn(Met)3(NO3)2·H2O(s),s]=-(1472.65±0.76) J·mol-1.
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关键词:
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绝热量热法
- / 热容
- / 标准摩尔生成焓
- / 溶解-反应量热法
- / Zn(Met)3(NO3)2·H2O(s)
English
Low Temperature Heat Capacities and Standard Molar Enthalpy of Formation of the Coordination Compound Zn(Met)3(NO3)2·H2O(s)(Met=L-α-Methionine)
Low temperature heat capacities of the compound Zn(Met)3(NO3)2·H2O(s) have been measured by a precision automated adiabatic calorimeter over the temperature range 78-371 K. The initial dehydration temperature of the coordination compound was determined to be TD=325.10 K by analysis of the heat-capacity curve. The experimental values of the molar heat capacities in the temperature region have been fitted to a polynomial equation of heat capacities with the reduced temperature (X), [X=f(T)], by the least squares method. Smoothed heat capacities and thermodynamic functions relative to the standard reference temperature 298.15 K of the compound are derived from the fitted polynomial equation and listed at 5 K internals. Using 100 mL of 2 mol·L-1 HCl(aq) as calorimetric solvent, with an isoperibol solution-reaction calorimeter, the standard molar enthalpy of formation of the compound was determined to be ΔfHm0[Zn(Met)3(NO3)2×H2O(s), s]=-(1472.65±0.76) J·mol-1 by a designed thermochemical cycle.
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