Organotin complexes of the types Ph3SnL and Bu2SnL [where Ph？=？phenyl and Bu？=？butyl; HL？=？1-phenyl-2,5-dithiohydrazodicarbonamide (HPhthc), 1-benzyl-2,5-dithiohydrazodicarbonamide (Hbzthc), 1-(4-ethoxyphenyl)-2,5-dithiohydrazodicarbonamide (HEtOPhthc)] have been prepared. Molar conductance studies demonstrate the nonionic behavior of the complexes. The 1H and 13C nuclear magnetic resonance and FAB mass spectra of the complexes are consistent with the proposed stoichiometry. Infrared spectra suggest an anionic bidentate coordinating behavior of the ligands. 1. Introduction Dithiohydrazodicarbonamides have proved to be compounds of versatile behavior. This particular ligand system and its 3d metal complexes have been shown to possess high antimicrobial activity [1, 2]. Anticorrosion properties of these ligands have also been recognized for the corrosion of copper in aqueous chloride solutions [3]. Some 1-aryl-2,5-dithiohydrazodicarbonamides and their molybdenum and tungsten complexes have been found to act as excellent extreme-pressure lubrication additives [4] and corrosion inhibitors for mild steel in 1.0？N sulfuric acid [5]. Biocidal activity of organotins is well recognized [6–8]. These have been enormously used as antifouling paints [9, 10]. Organotins derived from carboxylic acid, phosphoric group, N, S donating groups have been studied as corrosion inhibitors [11–22]. Organotins are known for their friction and wear reducing properties [23–25]. Organotin derivatives of alkylphenols have been successfully used as antiwear additives for lubricating oils [26]. Since organotins and dithiohydrazodicarbonamides both are well known for their biocidal behavior, friction and wear reducing properties and anticorrosive properties, synthesis of organotin complexes with dithiohydrazodicarbonamides was undertaken with intent to explore their applicability as corrosion inhibitors. The present communication, therefore, describes the synthesis of some triphenyltin and dibutyltin dithiohydrazodicarbonamides and their characterization by infrared, proton, and 13C nuclear magnetic resonance spectroscopy and FAB mass spectrometry. 2. Experimental 2.1. Materials Analytical grade reagents were used in the present investigation. The ligands were prepared by refluxing thiosemicarbazide with appropriate aryl isothiocyanates in 50% ethanol using previously reported methods [27]. In a representative experiment 1-phenyl-2,5-dithiohydrazodicarbonamide was synthesized as given below. Thiosemicarbazide (0.05？moL) and phenyl isothiocyanate (0.05？moL) were mixed with 50？mL of 50%
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