Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1262775 | Journal of Rare Earths | 2007 | 4 Pages |
Abstract
The complex of lanthanum chloride with Glycine and Alanine, La(Gly)2(Ala)3Cl3 · 2H2O, was synthesized and characterized by IR, elementary analysis, thermogravimetric analysis, and chemical analysis. The dissolution enthalpies of LaCl3 · 7H2O(s), 2Gly(s) + 3Ala(s) and La(Gly)2(Ala)3Cl3 · 2H2O(s) were determined in 2 mol · L−1 HCl by a solution-reaction isoperibol calorimeter. By designing a thermochemical cycle in terms of Hess' Law and through calculation, the reaction enthalpy of lanthanum chloride seven-hydrate with Glycine and Alanine was obtained: ΔrHθm(298.15 K) = (29.652 ± 0.504) kJ · mol−1, and the standard enthalpy of formation of La(Gly)2(Ala)3Cl3 · 2H2O(s) ΔfHθm[La(Gly)2 (Ala)3Cl3 · 2H2O, s, 298.15 K] = −4467.6 ± 8.3 kJ · mol−1.
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