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合成了稀土氯化钬丙氨酸配合物,犤Ho2(Ala)4(H2O)8犦Cl6,的晶体.用绝热量热法测定了其在78～363K温区的热容.在214～255K温区发现一固-固相变,相变峰温、相变焓和相变熵分别为235.09K,3.017kJ·mol-1和12.83J·K-1·mol-1.用最小二乘法将实验热容值拟合成热容随温度变化的多项式方程,利用此方程式和热力学函数关系,计算出以298.15K为参考温度的热力学函数值.在40～800℃温区,用热重分析和差示扫描量热法研究了该配合物的热稳定性,观察到犤Ho2(Ala)4(H2O)8犦Cl6分两步分解,第一步从80℃开始,179℃结束;第二步从242℃开始,479℃结束.从热分析结果推测出该配合物可能的热分解机理.
Synthesis of rare earth chloride holmium alanine complex, Ho Ho2 (Ala) 4 (H2O) 8 犦 Cl6, crystals by adiabatic calorimetry heat measured in the 78 ~ 363K temperature region in 214 ~ 255K In the temperature region, a solid-solid phase transition, a peak phase transition temperature, a phase transition enthalpy and a phase entropy of 235.09K, 3.017kJ · mol-1 and 12.83J · K-1 · mol-1, respectively, were found. The experimental heat capacity value is fitted to a polynomial equation of heat capacity with temperature, and the thermodynamic function value with 298.15K as the reference temperature is calculated by using this equation and the thermodynamic function.Under the temperature range of 40 ~ 800 ℃, The thermal stability of the complex was studied by differential scanning calorimetry. It was observed that 犤 Ho2 (Ala) 4 (H2O) 8 犦 Cl6 decomposed in two steps, starting from 80 ℃ and ending at 179 ℃ in the first step. The second step Starting from 242 ° C and ending at 479 ° C, the possible thermal decomposition mechanism of the complex was deduced from the thermal analysis.