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Synthesis, Spectral, Cyclic Voltammetric and Biological Studies of Copper (II) Complexes With N, N’, N”-Tris-(Benzimidazolyl) Methane Ligand

Yogesh K. Sharma And Magan Prasad

The tripodal ligand N, N’, N’’-tris-(Benzimidazolyl)-methane (TBM) containing benzimidazole as pendant groups has been synthesized and utilized to prepare Cu (II) complexes of general composition [Cu (TBM) X2]. n H2O. Where X is an exogenous anionic ligand (X = Cl- , NO3 - , CH3COO- and HCOO- ). Complexes of 1 : 1 stochiometry form with the ligands in methanol and were characterized by elemental analysis, EPR, IR, UV-VIS spectroscopic and other analytical techniques. X-band EPR spectra of the above complexes indicate a typical axial spectra with severe distortion of the N2X2 basal plane. The cyclic voltammograms of the complexes were taken in DMSO. Cyclic Voltammetric measurement of the complexes display quasi reversible redox wave. The –ve reduction potential values reveal the strong binding of anionic donors stabilizing the Cu (II) oxidation state. The magnetic moment data reveal the monomeric nature. The IR spectral data reveal unidentate mode of binding of the benzimidazole and anionic donors to the copper site. The UV spectra reveal that the UV bands are all blue shifted upon coordination and in general in enhance in intensity. The large molar extinction coefficients reveal that the copper site in the complexes is of low symmetry.