物理化学学报 >> 2001, Vol. 17 >> Issue (10): 956-960.doi: 10.3866/PKU.WHXB20011019

研究简报 上一篇    

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

吴新明;刘义;屈松生;张大顺;刘平;王春艳   

  1. 武汉大学化学与分子科学学院,武汉 430072;湖南常德师范学院化学化工系,常德 415000
  • 收稿日期:2001-04-02 修回日期:2001-06-28 发布日期:2001-10-15
  • 通讯作者: 屈松生 E-mail:ipc@whu.edu.cn

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

Wu Xin-Ming;Liu Yi;Qu Song-Sheng;Zhang Da-Shun;Liu Ping;Wang Chun-Yan   

  1. College of Chemistry and Molecular Science,Wuhan University,Wuhan 430072;Department of Chemistry and Chemical Engineering,Changde Teacher′s University,Changde 415000
  • Received:2001-04-02 Revised:2001-06-28 Published:2001-10-15
  • Contact: Qu Song-Sheng E-mail:ipc@whu.edu.cn

摘要: 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.

关键词: 高氯酸盐, L-脯氨酸, [RE2(L-Pro)6(H2O)4](ClO4)6(RE=Pr,Er), 反应热, 标准生成焓

Abstract: 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.

Key words: Perchlorate, L-Proline, [RE2(L-Pro)6(H2O)4](ClO4)6(RE=Pr,Er)