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).
出处
《华中师范大学学报（自然科学版）》
CAS
CSCD
北大核心
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).
关键词
稀土配合物
氨基酸
量热
热化学
标准生成焓
rare earth complex
amino acids
calorimetry
thermochemistry
standard molar enthalpy of formation
