Thiohydrazone complexes of organotin(IV): Synthesis, spectroscopy and thermal studies

Organotin (IV) thiohydrazones derived from piperidine were synthesized and characterized. At first the potassium salt of piperidine dithiocarbamate was prepared from dropwise addition Of CS2 to ethanolic mixture of piperidine in basic medium. Then piperidine-N-thiohydrazide was prepared from the reaction of dithiocarbamate with hydrazine hydrate and chloroacetic acid. After that thiohydrazones were prepared from condensation of piperidine-N-thiohydrazide and aldehydes (cinnamaldehyde and salicylaldehyde). Then complexes were prepared from reaction of thiohydrazone with organotin (IV) compounds (diallyltin dibromide, tribenzyltin chloride, tri-p-chlorobenzyltin chloride). The complexes synthesized were characterized through infrared, ultraviolet, (HNMR)-N-1 spectroscopic methods. Quantitative analyses were carried out using CHNS and tin analysis. Also thermoanalytical techniques (TG, DTA) have been employed to calculate various thermodynamic parameters like order of reaction (n), heat of reaction DeltaH, activation energy E-a for solid state decomposition of complexes.