高氯酸铒与甘氨酸及丙氨酸混配物的标准生成焓  

The Standard Molar Enthalpies of Formation of Two Mixed Ligand Complexes of Erbium Perchlorate with Glycine and Alanine

作　　者：陈平初[1] 刘义[2] 李武客[1] 屈松生[2] 

机构地区：[1]华中师范大学化学学院,湖北武汉430079 [2]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2005年第4期431-434,共4页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金资助项目(30170010);教育部高校优秀青年教师教学科研奖励计划(2001)资助项目

摘　　要：合成了两种高氯酸铒和甘氨酸及丙氨酸的混配型配合物,经元素分析、化学分析、热重、差热及与有关文献对比,确定其组成为[Er2(Gly)4(Ala)2(H2O)4](ClO4)6.3H2O和Er2(Gly)5(Ala)3(ClO4)6.2H2O.用溶解量热法在具有恒温环境精密溶解-反应热量计上分别测定了298.15K时两种配合物的反应物和产物在2mol/LHCl溶液中的溶解焓.通过设计热化学循环求出配位反应的焓变ΔrHm,进而计算出配合物的标准生成焓:ΔfH—○—m—{[Er2(Gly)4(Ala)2(H2O)4](ClO4)6·3H2O,s,298.15K}=-7408.60kJ·mol-1;ΔfH——m○—{Er2(Gly)5(Ala)3(ClO4)6·2H2O,s,298.15K}=-7079.16kJ·mol-1.The mixed ligand complexes of erbium perchlorate with glycine and alanine were synthesized. Their compositions were determined to be [Er2（Gly）4（Ala）2（H2O）4]（ClO4）6·3H2O and（Er2（Gly）5（Ala）3（ClO4）6·2H2O4 by comparison of elemental analysis, chemical analysis, TG-DTA,data with corresponding literature. The dissolution enthalpies of their reactants and products in 2 mol/L HCl solution （298. 15 K） were measured respectively with anisoperiblesolution-reactioncalorimeter. Each △rHm of the coordination reaction was calculated by a designed thermochemical cycle. Based on it, each standard molar enthalpy of formation was obtained, i. e. ,△fHm^О{[Er2（Gly）2（Ala）2（H2O4]（ClO4）6·3H2O,s,298.15K}=-7408.60kJ·mol;△rHm^О{Er2（Gly）5（Ala）3（ClO4）6＋·2H2O,s,298.15K）=-7079.16kJ·mol.

关 键 词：稀土氨基酸配合物 毓热法 热化学 标准摩尔生成焓 

分 类 号：O642.3[理学—物理化学] O614.33[理学—化学]