Abstract
Copper(II) complexes of Schiff base ligands formed by the condensation of cystamine (cys) or 2,2′-diaminodiphenyl-disulphide (ddds) with salicylaldehyde (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 dx2-y2 ground state and exhibit low A∥ and g∥ values. The spectral results suggest equatorial coordination of disulphide in a square-based geometry. The π-delocalisation, unsaturation and flexibility in the ligands affect the ligand field, charge transfer and e.p.r. spectral parameters as well as the redox behaviour.
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