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Kaushik, Narender Kumar
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article
Organotin(IV) complexes of thiohydrazides and thiodiamines: synthesis, spectral and thermal studies.
Abstract
rganotin(IV) complexes of tribenzyltin(IV) chloride and di( para -chlorobenzyl)tin(IV) dichloride with thiohydrazides have been reported. The ligands synthesized were bidentate coordinating through sulphur and terminal nitrogen atoms. These form 1:1 metal–ligand complexes. The following organotin(IV) complexes have been synthesized: (C 6 H 5 CH 2 ) 3 Sn(L 1 )Cl, ( p -ClC 6 H 4 CH 2 ) 2 Sn(L 1 )Cl 2 , (C 6 H 5 CH 2 ) 3 Sn(L 1 )Cl, ( p -ClC 6 H 4 CH 2 ) 2 Sn(L 2 )Cl 2 , (C 6 H 5 CH 2 ) 3 Sn(L 3 )Cl, ( p -ClC 6 H 4 CH 2 ) 2 Sn(L 3 )Cl 2 , where (L 1 ): 2-phenylethyl N -thiohydrazide, (L 2 ): N -(2-phenylethyl- N -thio)-1,3-propane diamine, (L 3 ): N -(2-phenylethyl- N -thio)-1,2-ethane diamine. The complexes were synthesized by directly mixing, refluxing and stirring the ligands with organotin(IV) chlorides in a suitable solvent. The complexes were found to be pure and were characterized by elemental analysis, electronic, infrared, 1 H and 13 C NMR spectroscopy. These complexes were also studied for their thermal decomposition by thermogravimetry (TG) and differential thermal analysis (DTA). Various kinetic and thermodynamic parameters, viz. activation energy ( E a ), order of reaction ( n ), apparent activation entropy ( S # ) and heat of reaction (Δ H ) have been determined by using Horowitz–Metzger method. It was observed that these complexes are highly stable and the thermal degradation of these complexes is a spontaneous process. The ligands and their tin complexes have also been screened for their fungitoxicity activity and found to be quite active in this respect.