Coordination Compounds of Rare-Earth Nitrates with N,N-Dimethylacetamide

Coordination compounds of rare-earth nitrates with N,N-dimethylacetamide (DMAA) with the compositions [Sc(H2O)(DMAA)2(NO3)(μ-OH)2Sc(NO3)(DMAA)2(H2O)](NO3)2, [La(DMAA)4(NO3)3], [Ce(DMAA)5(NO3)2][Ce(DMAA)2(NO3)4], and [Ln(DMAA)3(NO3)3] (Ln = Pr, Nd, Sm–Lu, Y) have been synthesized. Using elemental analysis, IR spectroscopy, single-crystal and powder X-ray diffraction techniques, as well as TGA-DSC analysis, their compositions and structural features were determined; thermal decomposition of the compounds was studied in a wide temperature range (50–900°C). Complexes [Ln(DMAA)3(NO3)3] form two isostructural series: crystals with Ln = Pr–Dy belong to the monoclinic symmetry, and crystals with Ln = Ho–Lu, Y belong to the orthorhombic symmetry. It is shown that the coordination compounds can be used as precursors for the production of nanoscale REE oxides (from 12 to 50 nm) with a specific surface area of 18–65 m2/g.