Novel trinuclear spirostannoxane tin(IV) compound

The reaction of nBuSnCl(3) and sodium salt of 2-mercaptoethanol gave the co mpound Sn(nBu)(Cl){(OCH2CH2S)(2)Sn(nBu)}(2) (1). The compound 2, [(nBu)Sn(S CH2CH2O)SCH2CH2OH], was initially isolated from the reaction of 1, but was also synthesized front another route. Both compounds were characterized by IR, Sn-119, C-13 and H-1 NMR, FAB mass spectroscopy and elemental analyses and X-ray diffraction of single crystal. 1 is a tri-metallic Tin(IV) compou nd in which the central atom is in six-fold coordination while the two rema ining tin atoms show five-fold coordination. The pentacoordinated tin atoms are bonded to two [OCH2CH2S](-2) ligands forming two stannolanes, which ar e fused with the hexacoordinated tin atom forming a distannoxane system. Th is arrangement is quite different from previous staircase structures. NMR d ata point the same structure in solution. 2 consists of [(nBu)Sn(SCH2CH2O)( SCH2CH2OH)] units, which are associated via intermolecular SnO interactions . The tin atom forms two 'stannolane' units by interaction with [OCH2CH2S]( -2) and [HOCH2CH2S](-) ligands.