高氯酸镧和甘氨酸及丙氨酸混配型配合物的热化学研究  

Thermochemical study of a mixed ligand complex oflanthanum perchlorate with glycine and L-alanine

作　　者：陈平初[1] 李武客[1] 刘宛乔[1] 屈松生[2] 

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

出　　处：《华中师范大学学报（自然科学版）》2004年第1期72-75,共4页Journal of Central China Normal University：Natural Sciences

基　　金：国家自然科学基金资助项目(30170010).

摘　　要：合成了高氯酸镧和甘氨酸、丙氨酸的混配型配合物.经化学分析、热重、差热、及与有关文献对比,确定其组成为{La2(Gly)5(Ala)3(ClO4)6·2H2O}n,纯度为98.85%.用溶解量热法在具有恒定温度的反应热量计上分别测定了298.15K时反应物和产物在2mol·L-1的HCl中的溶解焓.设计一热化学循环求出配位反应的焓变△rHm,进而计算出配合物的标准生成焓:ΔfHm (La2(Gly)5(Ala)3(ClO4)6·2H2O)=-7146.92kJ·mol-1.The mixed ligand complex of lanthanum perchlorate with glycine and L-alanine has been synthesized. Through the DTA,TG,chemistry analysis and comparing with literature, its formula is { La_2(Gly)_5(Ala)_3(ClO_4)_6·2H_2O }_n, and its purity is 98.85%. The dissolution enthalpies of the reactants and products in (2 mol·L^(-1)) HCl solution (298.15 K) have been measured by using the isoperibol reaction calorimetry respectively. Δ_rH_m was calculated by a designed thermochemical cycle of the coordination reaction. From the results and related data, the standard molar enthalpy formation of La_2(Gly)_5(Ala)_3(ClO_4)_6·2H_2O has been obtained to be Δ_fH_m~(La_2(Gly)_5(Ala)_3(ClO_4)_6·2H_2O)=-7146.92 kJ·mol^(-1).

关 键 词：稀土配合物 氨基酸 量热 热化学 标准生成焓 

分 类 号：O642.31[理学—物理化学]