稀土脯氨酸配合物[RE2(L-Pro)6(H2O)4](ClO4)6的标准生成焓测定

合成了两种稀土高氯酸盐与L 脯氨酸配合物的晶体.经热重、差热、化学分析及对比有关文献,知其组成是[Pr2(L Pro)6(H2O)4](ClO4)6和[Er2(L Pro)6(H2O)4](ClO4)6,质量分数为99.24％和98.20％.选用RE(NO3)3•6H2O(RE=Pr,Er)、L Pro、NaClO4•H2O和NaNO3作辅助物,使用具有恒温环境的反应热量计,以2 mol•L－1 HCl作溶剂,分别测定了[2RE(NO3)3•6H2O＋6L Pro＋6NaClO4•H2O]和{[RE2(L PrO)6(H2O)4](ClO4)6＋6NaNO3}在298.15 K时的溶解热.设计一热化学循环求得化学反应的反应焓ΔrHm分别是：63.904 kJ•mol－1和91.017 kJ•mol－1,经计算得配合物[RE2(L Pro)6(H2O)4](ClO4)6(s)在298.15 K时的标准生成焓ΔfHm(298.15 K)分别是－6 594.78 kJ•mol－1和－6 532.87 kJ•mol－1.

Determination of Standard Enthalpies of Formation of Rare Earth (RE = Pr, Er)withL-Proline [ RE2 (L-Pro)6 (H2O)4 ] (ClO4)6Complexes

Crystals of two complex compounds of rare earth perchlorate with L proline,[RE2(L Pro)6(H2O)4](ClO4)6(RE=Pr,Er),were synthesized.Their structures were characterized using TG,DTA,chemical analytic method and comparing with literatures,and the purity is determined as 99.24％ and 98.20％,respectively.For the calculation of chemical reaction heat,solution heat of the [2RE(NO3)3•6H2O＋6L Pro＋6NaClO4•H2O] and the {[RE2(L Pro)6(H2O)4](ClO4)6＋6NaNO3} were firstly measured in 2 mol•L 1 HCl solvent with an isoperibel reaction calorimeter,respectively.The standard enthalpy of formation of the two crystals were calculated by chemical reaction heat and a designed thermochemical cycle at 298.15 K.The following reaction enthalpy and standard enthalpy of formation were obtained:　　RE=Pr:ΔrHm=－63.904 kJ•mol－1;RE=Er:ΔrHm=－ 91.017 kJ•mol－1;　　ΔfHm([Pr2(L Pro)6(H2O)4](ClO4)6,s,298.15 K)=－6 594.78 kJ•mol－1;　　ΔfHm([Er2(L Pro)6(H2O)4](ClO4)6,s,298.15 K)=－6 532.87 kJ•mol－1.