Novel trinuclear spirostannoxane tin(IV) compound

The reaction of nBuSnCl3 and sodium salt of 2-mercaptoethanol gave the compound Sn(nBu)(Cl){(OCH2CH2S)2Sn(nBu)}2 (1). The compound 2, [(nBu)Sn(SCH2CH2O) SCH2CH2OH], was initially isolated from the reaction of 1, but was also synthesized from another route. Both compounds were characterized by IR, 119Sn, 13C and 1H NMR, FAB mass spectroscopy and elemental analyses and X-ray diffraction of single crystal. 1 is a tri-metallic Tin(IV) compound in which the central atom is in six-fold coordination while the two remaining tin atoms show five-fold coordination. The pentacoordinated tin atoms are bonded to two [OCH2CH2S]−2 ligands forming two stannolanes, which are fused with the hexacoordinated tin atom forming a distannoxane system. This arrangement is quite different from previous staircase structures. NMR data 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 interacti...