Thermal analysis of lanthanide(III) and Y(III) complexes with 4-hydroxy-3-methoxybenzoic acid
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The complexes of lanthanides(III) and Y(III) with 4-hydroxy-3-methoxybenzoic acid (vanillic acid) of the formula Ln(C8H7O4)3×nH2O where n=2 for La(III), Pr(III); n=3 for Nd(III); n=4 for Sm(III); n=5 for Ce(III) and n=6 for Eu(III), Gd(III), Tb(III), Dy(III), Ho(III), Er(III), Tm(III), Yb(III), Lu(III) and Y(III) were prepared and IR spectra and X-ray diffraction patterns and their thermal decomposition were investigated. The carboxylate group in the studied complexes is a bidentate chelating or a bidentate chelating and bridging ligand. They are crystalline compounds. When heated, the complexes lose their crystallization water and decompose to the oxides Ln2O3, CeO2, Pr6O11 and Tb4O7. The intermediate decomposition products of complexes of La(III) to Lu(III) (except Ce(III)) are oxocarbonates Ln2O2CO3.
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