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

trabutylbis[(2-(benzoylthio)acetato)]-distannoxane C68H100O14S4Sn4 cry stallizesas 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 tetra nuclear GRAPHICS unit. The tin atoms occupy cis-trigonal bipyramidal ( C - Sna - C = 132.1(3)-degrees, C - Snb - C = 132.2(3)-degrees) sites. -dichloro-5-methylphenylthio)-acetato]distannoxane C68H100Cl8O10S4Sn4 (a = 11.590(2) angstrom, b = 13.817(2) angstrom, c = 14.304(2) angstr om, 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 di storted cis-trigonal bipyramids (C - Sna - C = 145.7(3)-degrees; C - S nb - C = 140.5(3)-degrees) owing to a different bonding mode of the ca rboxylato anions.