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利用精密绝热热量仪测定了配合化合物Zn(Met)_3(NO_3)_2·H_2O(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T_D=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(C_p)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 2 mol·L~(-1)HCl溶液为量热溶剂,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Δ_f H_m~0[Zn(Met)_3(NO_3)_2·H_2O,s]=-(1472.65±0.76)J·mol~(-1).
The molar calorific value of compound Zn (Met) _3 (NO_3) _2 · H_2O (s) (Met = L-α-methionine) in the temperature range of 78-371 K was determined by means of a precision adiabatic calorimeter.According to the heat capacity curve, The initial dehydration temperature of the complex was obtained as T_D = 325.10 K. The experimental data of the molar heat capacity of the complex were fitted by the least squares method to obtain the polynomial equation of the molar heat capacity (C_p) versus the reduction temperature (T) , And the heat capacity and thermodynamic function value of the complex were calculated.According to the designed thermochemical cycle, 100 mL 2 mol·L -1 HCl solution was used as the caloric solvent, The standard molar enthalpy of formation for the complex of 298.15 K was obtained as Δ_f H_m ~ 0 [Zn (Met) _3 (NO_3) _2 · H_2O, s] = - (1472.65 ± 0.76) J · mol -1.