Synthesis and Physicochemical Properties of Binary Cobalt(II) Borides. Thermal Reduction of Precursor Complexes [CoLn][B10H10] (L = H2O, n = 6; N2H4, n = 3)

Resumo

Complexes [CoL_n][B₁₀H₁₀], where L = H₂O, n = 6; L = N₂H₄, n = 3, have been synthesized and characterized. The possibility of their use as precursors for the synthesis of binary cobalt(II) borides has been shown. Cobalt(II) borides have been obtained by thermal reduction of precursor complexes in an inert atmosphere at 650 and 900°C. The purity and homogeneity of the precursors and their reduction products have been determined by elemental analysis, powder X-ray diffraction, and IR spectroscopy; magnetochemistry of precursors and their annealing products has been studied. The morphology of the final products has been studied. It has been found that the reduction products are structured oxide-boride and nitride-boride phases. The magnetochemical study of the phases showed a significant difference in their magnetic behavior.