Synthesis and characterisation of organotin(IV) derivatives of ambidentate ligands containing nitrogen and sulphur donor atoms

A series of organotin(IV) derivatives of bis(pyrimidin-2-ylthio) methane (ptm), 1,2-bis(pyrimidin-2-ylthio) ethane (pte) and 1,6-bis(pyrimidin-2-ylthio) hexane (pth) have been prepared in dichloromethane at room temperature. The 2:1 (M/L) molar ratio compounds have a general formula of [Sn2Clx Ph8-xL] (x = 2, 4, 6, 8; L = ptm, pte and pth). A 1:1 complex was also obtained by reacting SnClPh 3 with pth. The organotin derivatives were characterised by multinuclear NMR (H-1, C-13 and Sn-119) and infrared spectroscopy, gel permeation chromatography (GPC), microanalysis and melting point. In the triphenyltin derivatives, 1, 5, 9 and 10 the tin atoms show a distorted trigonal-bipyramidal confi guration where the ligand is monodentate towards the metal atom. In the compounds 2-4, 6-8 and 11-13, the tin atoms each exhibit a distorted octahedral confi guration. Chelation is formed between the tin nucleus and the coordinating sulphur and nitrogen atoms. The correlation between the (1)J(C-13-Sn-119) and C-Sn-C bond angle indicates formation of 5-coordinate compounds.