CRYSTAL AND MOLECULAR STRUCTURES OF SPIRO-BIS(TRITHIASTANNOCANE), SN(SCH2CH2SCH2CH2S)(2), AND SPIRO-BIS(OXADITHIASTANNOCANE), SN(SCH2CH2OCH2CH2S)(2) - DISTORTION OF THE SNS4 TETRAHEDRAL COORDINATION PRODUCED BY TRANSANNULAR SN-CENTER-DOT-CENTER-DOT-C

摘要

The title compounds, prepared from X(CH2CH2SNa)(2) (X = S, O) and SnCl4 were investigated by X-ray diffraction. In both compounds transannular secondary Sn ... X interactions in the eight-membered rings produce a distortion of the SnS4 tetrahedron. This consists of an enlargement of S-Sn-S angle [to 126.1 degrees when X = S and 118.9 degrees (118.4 degrees) when X = O] with simultaneous decrease of the opposite tetrahedral angle [to 93.2 degrees when X = S and 94.4 degrees (93.2 degrees) when X = O]. The coordination geometry in both compounds can be described as based upon a bicapped tetrahedron. [References: 38]