Acta Cryst. (2006). E62, m1088-m1090  [ doi:10.1107/S1600536806014115 ]

Bis(cyclopentenylacetato)tetraethyldistannoxane dimer

A. Ahmad, A. Khan, S. Ali and M. Parvez

Abstract: The molecular structure of the title compound, tetra-₂-(cyclopent-2-enyl)acetato-1:2²O:O';1:3²O:O';2:4²O:O';3:4²O:O'-octaethyl-1²C,2²C,3²C,4²C-di-₃-oxo-1:2:3³O;2:3:4³O-tetratin, [Sn₄(C₂H₅)₈(C₇H₉O₂)₄O₂], is composed of two independent centrosymmetric dimers lying about inversion centers. In each dimer, the central Sn₂O₂ core is fused with two four-membered (Sn₂O₂) and two six-membered (Sn₂O₃C) rings. The endocyclic Sn atoms are six-coordinate in a skew-trapezoidal bipyramidal environment. The exocyclic Sn atoms are five-coordinate and show disotorted trigonal-bipyramidal geometry. The cyclopentenylacetate ligand shows different modes of coordination with tin. In both dimers, the Sn-C distances lie in a very narrow range [2.118 (4)-2.134 (4) Å], while the Sn-O distances range between 2.042 (2) and 2.314 (3) Å for strong bonds and between 2.638 (3) and 2.658 (3) Å for relatively weaker Sn-O bonds.

Online 21 April 2006

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