配合物Zn(His)SO_4·H_2O(s)的低温热容和热力学性质

Low-temperature heat capacities and thermodynamic properties of the complex Zn(His)SO_4·H_2O

通过精密自动绝热热量计测定了配合物Zn(His)SO4·H2O(s)在78～390K温区的摩尔热容,由热容曲线得到其起始脱水温度328 90K;用最小二乘法拟合得到摩尔热容(Cp,m)对温度(T)的多项式方程,并在此基础上计算了它的各种热力学函数。此外,研究了其在惰性气氛下的热分解过程。

Lowtemperature heat capacities of the complex Zn(His)SO4·H2O(s)were precisely measured with a small sample precision automated adiabatic calorimeter over the temperature range from 78 to 390K.The initial dehydration temperature of the complex(T0=32890 K)was obtained by means of the analysis of heatcapacity curve.The experimental values of molar heat capacities were fitted to a polynomial equation of heat capacities (Cp.m)vs.temperature(T) with the least squares method,and the thermodynamic functions of the complex were calculated on the base of the equation.In addition,the thermal stability of the complex was studied by TGDTG and DSC techniques under the atmosphere of nitrogen.