Synthesis, characterization, electrochemical studies and catecholase-like activity of dinuclear copper(II) complexes of a phenol-based compartmental ligand

The new dinuclear copper(II) complexes, Cu(II)M(II) (M = Mn, Co, Ni, Cu), of a phenol-based compartmental ligand, having dissimilar N(amine)2O2 and N(imine)2O2 coordination sites have been synthesized. In this system there are two different compartments, one has piperazinyl nitrogens and phenolic oxygens and the other compartment has meso-stilbenediamine nitrogens and phenolic oxygens as coordinating sites. The complexes were characterized by elemental analysis, IR and electronic spectra as well as conductivity measurements. Dinuclear complexes were prepared through the CuIIPbII precursor complex by transmetalation of the Pb(II) for the M(II) ion. The electrochemistry and catecholase-like activity of the complexes were also studied using cyclic voltammetry and UV–Vis spectrophotometry, respectively. Electrochemical studies of the dinuclear complexes reveal that CuIIMII (M=Co, Ni, Cu) complexes undergo two quasi-reversible couples,  = −0.57 to −0.59 V and  = −0.90 to −1.05 V, whereas the CuIIMnII complex shows one quasi-reversible couple, E pc = −0.80 V. Our results show that the homodinuclear CuIICuII complex shows higher catalytic activity in oxidation of cathecol to the corresponding quinone compared to the other complexes. The molar conductances in acetonitrile solutions indicate that the complexes are 1 : 2 electrolytes.

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