Abstract
The paper reports the results of the study on the synthesis of new heterometallic complexes of Co(II) and Nd(III) with succinic acid in the presence of 1,10-phenanthroline or pyridine. The following hetero- and monocomplexes were synthesized: [Со(С4Н4О4)2Ру]2H2O and [Со(С4Н4О4)Рhen]2H2O; [Nd2(С4Н4О4)3]5Н2О and [Nd2(С4Н4О4)32Phen]2Н2О; [Сo2Nd2(C4Н4O4)54Py]4Н2О and [Сo2Nd2(C4Н4O4)52Phen]4Н2О (Phen – phenanthroline, and Py – pyridine). The study of their composition, structure, thermal properties and determination of the ability of heterocomplexes to form complex oxides was carried out. The complexes were characterized by a number of physicochemical methods: elemental analysis, IR- and diffuse reflection spectroscopies, X-ray powder diffraction and differential thermal analysis. Based on the analysis of diffuse reflection spectra and IR spectra of heterocomplexes, it was shown that succinic acid and 1,10-phenanthroline are bidentately bound to metal atoms. The metals are connected by succinic acid, forming a chain. Oxide powders were obtained during thermolysis of heterocomplexes up to 8000C. The composition of the synthesized heterometallic compounds was controlled by X-ray powder diffraction. It was shown that a complex oxide of NdСоО3 (cubic crystal system), without impurities, was formed, when the heterocomplex of phenanthroline [Сo2Nd2(C4Н4O4)52Phen]4Н2О was heated to 8000C. When heating the heterocomplex of pyridine [Сo2Nd2(C4Н4O4)54Py]4Н2О, in addition to the complex oxide NdСоО3, oxides Nd2О3 (hexagonal crystal system), Nd2О3 (cubic crystal system) and Со3O4 oxide (cubic crystal system) were formed. The heterocomplex [Сo2Nd2(C4Н4O4)52Phen]4Н2О can be used as a precursor for the synthesis of cobaltate of neodymium with lower energy costs than in solid-phase synthesis.
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