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In the centrosymmetric tetra-nuclear title complex, [Sn(4)(C(4)H(9))(8)(C(3)H(3)Br(2)O(2))(4)O(2)], one of the two independent Sn atoms is five-coordinated by one O atom of the carboxyl-ate anion, two bridging O atoms and two n-butyl groups in a C(2)SnO(3) distorted trigonal bipyramidal geometry. The other Sn atom also has a distorted trigonal bipyramidal geometry, being coordinated by two O atoms of two carboxyl-ate anions, one bridging O atom and two butyl groups. An inter-esting feature of the crystal structure is the short Sn⋯O [2.756 (4) Å] and O⋯O [2.608 (3) Å] inter-actions. The -BrCH(2)-CHBr- segments of the two carboxyl-ate anions are disordered over two positions [site occupancies of 0.60 (1)/0.40 (1) and 0.53 (2)/0.47 (2)]. Weak non-directional C-H⋯O inter-actions lead to the formation of infinte chains along the a axis; other weak inter-molecular C-H⋯π inter-actions are also present.

acta crystallographica. section e

Octa-n-butyl-1κ2C,2κ2C,3κ2,4κ2C-bis(μ-2,3-dibromopropionato)-1:2κ2O:O′,3:4κ2O:O′-bis(2,3-dibromopropionato)-1κO,3κO-di-μ3-oxido-1:2:4κ3O:O:O,2:3:4κ3O:O:O-tetratin(IV)