Synthesis,characterization and superoxide dismutase activity of a series of copper(II)complexes containing NNO donor Schiff base and benzimidazole ligands

摘要

Several mixed ligand copper(II)complexes,viz.,[Cu(BPS)(ImH)](ClO4)(1),[Cu(BPS)(MeImH)](ClO4)(2),[Cu(BPS)(EtlmH)](ClO4)(3),[Cu(BPS)(BenzImH)]ClO4.0.5H2O(4)and [Cu(BPS)(MeBenzImH)]ClO4(5),where BPS = benzoylpyridine 4-phenylsemicarbazone,ImH = imidazole,MeImH = 2-methylimidazole,EtImH = 2-ethylimidazole,BenzImH = benzimidazole,MeBenzImH = 2-methylbenzimidazole have been synthesized and characterized by the elemental analysis,molar conductance measurements,magnetic susceptibility measurements,FAB mass,IR,electronic,EPR spectral and cyclic voltammetric studies.The BenzImH complex(4)is structurally characterized by single crystal X-ray crystallography.Complex(4)crystallizes in the triclinic space group P-I with unit cell parameters: a = 10.104(3)A,b = 10.924(3)A,c = 13.128(3)A,alpha = 80.21(2)° ,beta= 70.63(3)°,gamma = 89.61(2)and Z = 2.The one electron paramagnetic complexes show a d-d band near 700nm in DMSO and a cyclic voltammetric response due to Cu(II)/Cu(I)couple.The complexes show the presence of a distorted square planar CuN2O2 coordination geometry.Superoxide dismutase activity of the present complexes has also been studied.