CRYSTAL-STRUCTURES OF TETRABUTYLBIS[2-(BENZOYLTHIO)ACETATO)]-DISTANNOXANE AND TETRABUTYLBIS[2-(2,4-DICHLORO-5-METHYLPHENYLTHIO)-ACETATO]DISTANNOXANE DIMERS

Tetrabutylbis[(2-(benzoylthio)acetato)]-distannoxane C68H100O14S4Sn4 crystallizesas a dimer (a = 12.2015(7) angstrom, b = 12.2182(6) angstrom, c = 14.0068(8) angstrom, alpha = 71.737(4)-degrees, beta = 79.400(5)-degrees, gamma = 83.490(5)-degrees) containing a centrosymmetric tetranuclear GRAPHICS unit. The tin atoms occupy cis-trigonal bipyramidal (C - Sna - C = 132.1(3)-degrees, C - Snb - C = 132.2(3)-degrees) sites. Tetrabutylbis[2-(2,4-dichloro-5-methylphenylthio)-acetato]distannoxane C68H100Cl8O10S4Sn4 (a = 11.590(2) angstrom, b = 13.817(2) angstrom, c = 14.304(2) angstrom, alpha = 71.05(1)-degree, beta = 80.62(1)-degree, gamma = 81.39(1)-degree) has this unit, but the geometries at the tin atoms are more distorted cis-trigonal bipyramids (C - Sna - C = 145.7(3)-degrees; C - Snb - C = 140.5(3)-degrees) owing to a different bonding mode of the carboxylato anions.