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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
引用本文:张国春,周春生,高胜利.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[J].物理化学学报,2013,29(10):2129-2134.
作者姓名:张国春  周春生  高胜利
作者单位:Department of Chemistry & Chemical Engineering, Shangluo University, Shangzhou 726000, Shaanxi Province, P. R. China
基金项目:国家自然科学基金(21273171 21127004, 21173168)和陕西省教育厅专项基金(11JK0578, 11JS110)资助项目
摘    要: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ΔfHm0Zn(Met)3(NO3)2·H2O(s),s]=-(1472.65±0.76) J·mol-1.

关 键 词: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)  
收稿时间:2013-06-12
修稿时间:2013-09-10

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)
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.
Authors:ZHANG Guo-Chun  ZHOU Chun-Sheng  GAO Sheng-Li
Institution:Department of Chemistry & Chemical Engineering, Shangluo University, Shangzhou 726000, Shaanxi Province, P. R. China
Abstract: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 ΔfHm0Zn(Met)3(NO3)2×H2O(s), s]=-(1472.65±0.76) J·mol-1 by a designed thermochemical cycle.
Keywords:Adiabatic calorimetry  Heat capacity  Standard molar enthalpy of formation  Isoperibol solution-reaction calorimetry  3(NO3)2·  H2O (s)'  ')  Zn(Met)3(NO3)2·" target="_blank">">Zn(Met)3(NO3)2·  H2O (s)
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