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

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