Synthesis and characterization of unusual heterotrinuclear Co(III)Ni(II)Co(III) hydrotris(3,5-dimethylpyrazolyl)borate complex with mixed 1,1-azide and pyrazolate bridges

An unusual heterotrinuclear complex [LCo(μ-L1, 1-N3)2(μ-L1)Ni(μ-1, 1-N3)2(μ-L1)CoL] (1) was obtained by the reaction of the precursor of half-sandwich nickel(II) complex [LNi(HL1)2(N3)] (2) and CoCl2 · 6H2O (L = hydrotris(3,5-dimethylpyrazolyl)borate; L1 = 3,5-dimethylpyrazolate), the complex 1 was characterized by X-ray single-crystal diffraction, elemental analysis, IR, UV–vis spectra and magnetic properties.