Synthesis, crystal structures, spectroscopic and electrochemical properties of homologous series of copper(II) complexes of Schiff bases derived fromcycloalkylamines

Six Schiff base copper(ii) complexes have been prepared and characterized, elemental analyses, mass, IR and electronic spectra. mu (eff) and X-ray cry stal structures being obtained. The X-ray study shows that the geometry aro und the metal atom is square planar for one of the complexes only and disto rted square planar for the others. Electrochemical studies on the complexes , though revealing a dependence of the Cu(II)/Cu(I) potentials on electroni c effects, also show that these are independent of the structure observed i n the solid state. Besides, EPR studies of these complexes in DMF solution at 193 K suggest that the geometry of these complexes in solution is differ ent to that observed in the solid state by X-ray crystallography.