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)

Abstract

In the centrosymmetric tetra­nuclear title complex, [Sn4(C4H9)8(C3H3Br2O2)4O2], one of the two independent Sn atoms is five-coordinated by one O atom of the carboxyl­ate anion, two bridging O atoms and two n-butyl groups in a C2SnO3 distorted trigonal bipyramidal geometry. The other Sn atom also has a distorted trigonal bipyramidal geometry, being coordinated by two O atoms of two carboxyl­ate anions, one bridging O atom and two butyl groups. An inter­esting feature of the crystal structure is the short Sn⋯O [2.756 (4) Å] and O⋯O [2.608 (3) Å] inter­actions. The –BrCH2—CHBr– segments of the two carboxyl­ate 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 inter­actions lead to the formation of infinte chains along the a axis; other weak inter­molecular C—H⋯π inter­actions are also present.