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Three nickel(II) complexes, namely [Ni(BH) 3 ]-(H 2 O)(NO 3 )(ClO 4 ) 1, [Ni(BH) 2 (NO 3 ) 2 ] 2 and [Ni(BH)-(Tren)](ClO 4 ) 2 3 (BH = Benzoylhydrazine, Tren = Tris(2-aminoethyl)amine) have been synthesized and characterized by physico-chemical techniques. X-ray crystallographic analysis shows the nickel to be six-coordinated in these complexes. The complexes are efficient catalysts for the dismutation of superoxide in alkaline DMSO-NBT assays. The IC 50 values are 74,108 and 105 lM for 1, 2 and 3, respectively.