Author： Brzyska W. Bartyzel A. Zieniewicz K. Zwolińska A.
Publisher： Springer Publishing Company
ISSN： 1388-6150
Source： Journal of Thermal Analysis and Calorimetry, Vol.63, Iss.2, 2000-02, pp. : 493-500
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Abstract
Rare earth element 3-methyladipates were prepared as crystalline solids with general formula Ln_2(C_7H_10O_4)_3⋅nH_2O, where n=6 for La, n=4 for Ce, Sm–Lu, n=5 for Pr, Nd and n=5.5 for Y. Their solubilities in water at 293 K were determined (2⋅10^–3–1.5⋅10^–4 mol dm^–3). The IR spectra of the prepared complexes suggest that the carboxylate groups are bidentate chelating. During heating the hydrated 3-methyladipates lose all crystallization water molecules in one (Ce–Lu) or two steps (Y) (except of La(III) complex which undergoes to monohydrate) and then decompose directly to oxides (Y, Ce) or with intermediate formation of oxocarbonates Ln_2O_2CO_3 (Pr–Tb) or Ln_2O(CO_3)_2 (Gd–Lu). Only La(III) complex decomposes in four steps forming additionally unstable La_2(C_7H_10O_4)(CO_3)_2.
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