Synthesis, characterization & thermal studies of some dithiocarbazate Schiff bases - Organotin(IV), Organozine(II) complexes

The reactions of tribenzyltin chloride, di(para-chlorobenzyl)tin dichloride, methylzinc iodide with Schiff base ligands having nitrogen and sulphur donor atoms have been synthesized by the interaction of the suitable organometallic halide with respective ligands in THE The synthesized complexes were found to be pure and have been characterized by elemental analysis, electronic, infrared, (HNMR)-H-1 spectroscopy. Various thermodynamic parameters viz. activation energy (Ea), apparent activation entropy (S) and heat of reaction (Delta H) are reported. Mathematical analysis of TG and DTA data using Horowitz-Metzger method shows that the first order kinetics is applicable to all the complexes. It was observed that these complexes are stable and the thermal degradation of these complexes is a spontaneous process. The analysis has revealed that the ligand co-ordinates with the metal ion through the azomethine nitrogen and thioketo sulphur atoms.