of reduced glutathione (GSH) of general composition [Pb(L)(X)]H2O
(where L=GSH; X=Cl,
NO3, CH3COO, NCS) have been
synthesized and characterized by elemental analyses, infrared spectra and
electronic spectra. Thermogravimetric (TG) and differential thermal analytical
(DTA) studies have been carried out for these complexes. Infrared spectra
indicate deprotonation and coordination of cysteinyl sulphur with metal ion.
It indicates the presence of water molecule in the complexes that has been
supported by TG/DTA. The thermal behaviour of complexes shows that water molecule
is removed in first step-followed removal of anions and then decomposition
of the ligand molecule in the subsequent steps. Thermal decomposition of all
the complexes proceeds via first order kinetics. The thermodynamic activation
parameters, such as E*, A,
and ΔG* have been calculated. The
geometry of the metal complexes has been studied with the help of molecular
modeling for energy minimization calculation.