【摘要】 利用精密自动绝热热量计测定了Nd(Gly)2Cl3·3H2O在80-357K和Pr(Ala)3Cl3·3H2O在80-374K温区的热容.根据两个化合物的热容计算出了相对于参考温度298.15K的热力学函数(HTH298.15)和(STS298.15).根据热重(TG)分析结果,提出了这两个稀土化合物可能的热分解机理.利用溶解-反应恒温热量计测定相关化合物的溶解焓并设计盖斯热化学循环,计算出了两个化合物的标准摩尔生成焓.更多还原

【Abstract】 The heat capacities of rare earth complexes,Nd(Gly)2 Cl3 · 3H2O and Pr(Ala)3Cl3 · 3H 2 O were measured with a high-precision automatic adiabatic calorimeter in the temperature range from 80 to 357 K for Nd(Gly)2Cl3 · 3H2O,and from 80 to 374 K for Pr(Ala)3 Cl3·3H2O.The thermodynamic functions (H T H 298.15) and (S T S 298.15) relative to the reference temperature 298.15 K of the two compounds were calculated based on experimental heat capacity data.Possible mechanisms of thermal decompositions were proposed according to the thermogravimetric (TG) analysis.Based on the measurements of dissolution enthalpies using a solution-reaction isoperibol calorimeter,the standard molar enthalpies of formation were calculated in terms of a designed Hess thermochemical cycle.更多还原