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1 Polish Journal of Chemistry

1 2001

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Spectral and Thermal Investigations of Y(III) and Lanthanide(III) Complexes with 3,3-Dimethylglutaric Acid

Brzyska W., Ożga W.

Polish Journal of Chemistry

2001

Vol. 75, nr 1

43-47

Conditions for the preparation of Y(III) and lanthanide(III) (La-Lu) 3,3-dimethylglutarates were investigated and their quantitative composition and solubility in water at 293Kwere determined (10-2-10-5 mole dm-3). The IR spectra of the complexes prepared with the general formula Ln2{C5H10(COO)2}3 nH2O (n = 2-15) were recorded and their thermal decomposition in air were investigated. During heating the hydrated 3,3-dimethylglutarates are dehydrated in one (La, Ce, Pr, Sm, Gd, Lu ), two (Y, Nd, Eu, Dy, Ho, Tm) or three (Tb, Er) steps and next the anhydrous complexes and dihydrated Yb(III) complex decompose to oxides Ln2O3, CeO2, Pr6O11 and Tb4O7 with intermediate formation Ln2O2CO3 except of Ce(III) complex, which decomposes directly to CeO2. The carboxylate groups in the complexes studied are bidentate.