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Abstract
The synthesis and characterization of a novel ligand, dihydrobis(5-nitroindazolyl) borate, and several of its complexes with transition metal ions have been carried out. It has been found that the ligand is uninegative, and forms octahedral complexes of the metal ions V(III), Fe(III), Pt(IV), Cr(II), Mn(II) and Co(II). The Ni(II), Cu(II) and Pd(II) ions form square-planar complexes whereas the Cu(I) ion yields a tetrahedral mixed ligand complex involving a dihydrobis(5-nitroindazolyl) borate and two 5-nitroindazolyl moieties. The Fe(III) complex has been found to undergo reduction when the solution is left to stand for about a month giving the Fe(II) complex in the form of a stable solid compound.