COPPER(II)-DISULFIDE INTERACTION IN COPPER-COMPLEXES CONTAINING SALICYLALDIMINE AND PYRIDYLALDIMINE LIGANDS - SYNTHESIS, SPECTRA AND REDOX BEHAVIOR

Copper(II) complexes of Schiff base ligands formed by the condensation of cystamine (cys) or 2,2'-diaminodiphenyldisulphide (ddds) with sali cylaldehyde (sal) or pyridine-2-carboxaldehyde (pal), and also their C =N reduced analogues, have been isolated and characterised. The e.p.r. spectra of the complexes reveal a d(x)2(-y)2 ground state and exhibit low A(parallel to) and g(parallel to) values. The spectral results su ggest equatorial coordination of disulphide in a square-based geometry . The pi-delocalisation, unsaturation and flexibility in the ligands a ffect the ligand field, charge transfer and e.p.r. spectral parameters as well as the redox behaviour.