Spectroscopic studies and thermal analysis of lead(II) and tin(II) solid complexes with bi- , tri- and tetradentate Schiff bases

The Schiff base complexes of Pb(II) and Sn(II) with bidentate (NO), [M(sal-An)2] (sal-An = aniline salicylideneiminato); tridentate (ONO), [M(sal-OAP)H2O)] (sal-OAP = ortho- aminophenol salicylideneiminato); and tetradentate (N2O2), [M(sal-o-phdn)] (sal-o-phdn = N,N'-o-phenylene bis(salicylideneiminato) have been synthesized. The infrared spectra were recorded and full assignments of all observed bands have been made. Differential thermal analysis (DTA) and thermogravimetric (TG) for all complexes were also carried out. The data obtained indicate that the complexes of both bi- and tetradentate ligands are decomposed in one stage, but the complexes of tridentate are decomposed in two steps.