Crystal structure of μ-oxalato-κ(2)O(1):O(2)-bis-[(dimethyl sulfoxide-κO)tri-phenyl-tin(IV)].

In the previously reported [C(2)O(4)(SnPh(3))(2)] complex [Diop et al. (2003 ▸). Appl. Organomet. Chem.17, 881-882.], the Sn(IV) atoms are able to formally complete their coordination by addition of dimethyl sulfoxide (DMSO) mol-ecules provided by the reaction medium, affording the title complex, [Sn(2)(C(6)H(5))(6)(C(2)O(4))(C(2)H(6)OS)(2)]. The Sn(IV) atoms are then penta-coordinated, with a common trans trigonal-bipyramidal arrangement. The asymmetric unit contains one half-mol-ecule, which is completed by inversion symmetry in space group type C2/c. The inversion centre is placed at the mid-point of the central bis-monodentate oxalate dianion, C(2)O(4)(2-), which bridges the [(SnPh(3))(DMSO)] moieties. The mol-ecule crystallizes as a disordered system, with two phenyl rings disordered by rotation about their Sn-C bonds, while the DMSO mol-ecule is split over two positions due to a tetra-hedral inversion at the S atom. All disordered parts were refined with occupancies fixed of 0.5.