Acta Cryst. (2006). E62, m1167-m1169  [ doi:10.1107/S1600536806014966 ]

Bis(cyclopentenylacetato)tetramethyldistannoxane dimer

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

Abstract: The crystal structure of the title compound, tetra-₂-(cyclopent-2-enyl)acetato-1:2²O:O';1:3²O:O';2:4²O:O';3:4²O:O'-octamethyl-1²C,2²C,3²C,4²C-di-₃-oxo-1:2:3³O;2:3:4³O-tetratin(IV), [Sn₄(CH₃)₈(C₇H₉O₂)₄O₂], is composed of discrete centrosymmetric dimers lying about inversion centres. The cyclopentenylacetate ligand shows different modes of coordination with Sn, as a result of which 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 distorted trigonal-bipyramidal geometry. The Sn-C distances lie in a very narrow range [2.095 (4)-2.113 (4) Å], while the Sn-O distances range between 2.030 (3) and 2.280 (3) Å for strong bonds and a value of 2.654 (3) Å for the relatively weak Sn-O bond.

Online 29 April 2006

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