Thermochemical Study of Lanthanum Complex Crystal with β-Alanine  

作　　者：陈平初 屈松生 詹正坤 吴新明 

机构地区：[1]ChemistryCollege,CentralChinaNormalUniversity,Wuhan430079,China [2]CollegeofChemistryandMolecularSciences,WuhanUniversity,Wuhan430072,China

出　　处：《Journal of Rare Earths》2002年第5期438-442,共5页稀土学报（英文版）

基　　金：ProjectsupportedbyScientificEffortFoundationoftheEducationCommissioninHubeiProvince ( 99CO 4 4)

摘　　要：Lanthanum complex crystal with β alanine (1∶3) was synthesized. Through the DTA,TG,chemistry analysis and comparison with literature, it shows that its form is {[La 2(β ala) 6· (H 2O) 4](ClO 4) 6·H 2O} n , and its purity is 98.86%. The dissolution enthalpy of the reactants and products in 2 mol·L -1 HCl solution (298.15K) was measured by using the isoperibol reaction calorimetry. Δ rH m was calculated by a designed thermochemical cycle of the coordination reaction. From the results and other auxiliary quantities, the standard molar enthalpy of formation of [La 2(β ala) 6·(H 2O) 4](ClO 4) 6·H 2O is obtained to be Δ fH m°{[La 2(β ala) 6·(H 2O) 4](ClO 4) 6·H 2O} = - 7062.911 kJ·mol -1 .Lanthanum complex crystal with β alanine (1∶3) was synthesized. Through the DTA,TG,chemistry analysis and comparison with literature, it shows that its form is {[La 2(β ala) 6· (H 2O) 4](ClO 4) 6·H 2O} n , and its purity is 98.86%. The dissolution enthalpy of the reactants and products in 2 mol·L -1 HCl solution (298.15K) was measured by using the isoperibol reaction calorimetry. Δ rH m was calculated by a designed thermochemical cycle of the coordination reaction. From the results and other auxiliary quantities, the standard molar enthalpy of formation of [La 2(β ala) 6·(H 2O) 4](ClO 4) 6·H 2O is obtained to be Δ fH m°{[La 2(β ala) 6·(H 2O) 4](ClO 4) 6·H 2O} = - 7062.911 kJ·mol -1 .

关 键 词：rare earths β  Alanine THERMOCHEMISTRY standard molar enthalpy of formation 

分 类 号：O642[理学—物理化学]