Thermochemical Study of Lanthanum Complex Crystal with β-Alanine

稀土学报(英文版), 2002, 20(5): 438-442.

陈平初 ^1, , 屈松生 ^2, , 詹正坤 ^3, , 吴新明 ^4,

1.Chemistry College, Central China Normal University, Wuhan 430079, China

2.College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China

3.Chemistry College, Central China Normal University, Wuhan 430079, China

4.College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China

基金项目: Scientific Effort Foundation of the Education Commission in Hubei Province(99CO44)

Thermochemical Study of Lanthanum Complex Crystal with β-Alanine

Keywords： rare earths

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 {[La2(β-ala)6* (H2O)4](ClO4)6*H2O}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. ΔrHm 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 [La2(β-ala)6*(H2O)4](ClO4)6*H2O is obtained to be ΔfHm°{[La2(β-ala)6*(H2O)4](ClO4)6*H2O} = - 7062.911 kJ*mol-1.

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Thermochemical Study of Lanthanum Complex Crystal with β-Alanine

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