Add nets of Neodymium(III) and Lanthanum(III) Acetylacetonate with some Bidentate Organic Bases

Abstract

Abstract Several bidentate uncharged organic base adducts of neodymium(III) and lanthanum(III) acetylacetonate were prepared by the reaction of the free bases with tris(acetylacetonato)neodymium(III) monohydrate and tris-(acetylacetonato) lanthanum(III) dihydrate in ethyl acetate, respectively. Elemental analyses, molecular weight determinations, NMR, IR, and visible absorption spectra indicate that the adducts are of the general formula Ln(AA)3(BB), where AA, BB, and Ln denote acetylacetonate ion, bidentate uncharged base and lanthanide ion, respectively. Thermal stability of the base adducts as well as the hydrates was studied by differential thermal analysis (DTA) and thermogravimetric analysis (TGA). Coordination of the additional ligand having reactive hydrogen atoms resulted in poor thermal stability of the addition complexes. This might be explained by assuming that the coordinated acetylacetonate ion reacts readily with the reactive hydrogen atom of the neighboring ligand to liberate acetylacetone molecule, though the nature of the resulting pyrolyzed products is unknown.