Spectral and thermal studies of homodinuclear and heterodinuclear glutathione complexes

Abstract

The complexes of the types [M₂LSO₄.2H₂O] where L=GSH, M = Co(II), Cu(II), Zn(II), Cd(II) and [MM'LSO₄.2H₂O] where L = GSH, M = Cu(II), M' = Zn(II) and M = Co(II), M' = Cd(II)] have been prepared and characterized by elemental analysis, magnetic susceptibility measurements, JR, EPR, electronic spectral studies and thermal analysis. Deprotonation and coordination of thiol group occurs and glycine residue binds with the metal ions in all the complexes. Copper(II) and cobalt(II) complexes show low magnetic moment. EPR spectral data show that complexes have planar geometry. Ligand to metal charge transfer are observed in all the complexes and d-d transition are also observed in copper(II) and cobalt(II) complexes. Thermal decomposition of all the complexes proceeds via first order kinetics.