物理化学学报
物理化學學報
물이화학학보
ACTA PHYSICO-CHIMICA SINICA
2013年
1期
17-22
,共6页
稀土配合物%绝热量热%低温热容%热力学函数%热重分析%溶解-反应恒温热量计%标准摩尔生成焓
稀土配閤物%絕熱量熱%低溫熱容%熱力學函數%熱重分析%溶解-反應恆溫熱量計%標準摩爾生成焓
희토배합물%절열량열%저온열용%열역학함수%열중분석%용해-반응항온열량계%표준마이생성함
Rare-earth complex%Adiabatic calorimetry%Low-temperature heat capacity%Thermodynamic function%Thermogravimetric analysis%Solution-reaction isoperibol calorimeter%Standard molar enthalpy of formation
利用精密自动绝热热量计测定了Nd(Gly)2Cl3·3H2O在80-357 K和Pr(Ala)3Cl3·3H2O在80-374 K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298.15 K的热力学函数(HT?H298.15)和(ST?S298.15).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.
利用精密自動絕熱熱量計測定瞭Nd(Gly)2Cl3·3H2O在80-357 K和Pr(Ala)3Cl3·3H2O在80-374 K溫區的熱容.根據兩箇化閤物的熱容計算齣瞭相對于參攷溫度298.15 K的熱力學函數(HT?H298.15)和(ST?S298.15).根據熱重(TG)分析結果,提齣瞭這兩箇稀土化閤物可能的熱分解機理.利用溶解-反應恆溫熱量計測定相關化閤物的溶解焓併設計蓋斯熱化學循環,計算齣瞭兩箇化閤物的標準摩爾生成焓.
이용정밀자동절열열량계측정료Nd(Gly)2Cl3·3H2O재80-357 K화Pr(Ala)3Cl3·3H2O재80-374 K온구적열용.근거량개화합물적열용계산출료상대우삼고온도298.15 K적열역학함수(HT?H298.15)화(ST?S298.15).근거열중(TG)분석결과,제출료저량개희토화합물가능적열분해궤리.이용용해-반응항온열량계측정상관화합물적용해함병설계개사열화학순배,계산출료량개화합물적표준마이생성함.
The heat capacities of rare earth complexes, Nd(Gly)2Cl3·3H2O and Pr(Ala)3Cl3·3H2O 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)3Cl3·3H2O. The thermodynamic functions (HT?H298.15) and (ST?S298.15) 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.
