Structural Investigations of Pd(II) and Pt(II) Complexes with O-Vanillin Thiosemicarbazone and 4-Phenylthiosemicarbazone and their Mixed Ligand Complexes

The Pd(II) and Pt(II) complexes with two dibasic tridentate ligands viz. o-vanillin thiosemicarbazone and o-vanillin-4-phenylthiosemicarbazone, have been synthesized and characterized on the basis of their elemental analysis, magnetic susceptibility, conductance, ir and electronic spectral and thermogravimetric data. The presence of chlorine atom in the coordination sphere imparts a square planar geometry to these complexes having the general formula [M (L) Cl]. The mixed ligand complexes of the type [M (L) py. H₂O] have also been prepared employing pyridine as an additional heterocyclic base. The complexes are square pyramidal and the presence of chlorine, water molecules is revealed by the study of their thermograms supported by the presence of relevant bands in their ir spectra. Suitable structures have been assigned to these binary and ternary complexes.