Crystal structure of μ-oxalato-κ 2 O 1: O 2-bis[(dimethyl sulfoxide-κ O)triphenyltin(IV)]

In the previously reported [C2O4 (SnPh3))2)] complex [Diop et al. (2003). Appl. Organomet. Chem. 17, 881-882.], the SnIV atoms are able to formally complete their coordination by addition of dimethyl sulfoxide (DMSO) molecules provided by the reaction medium, affording the title complex, [Sn2 (C6H5)6 (C2O4)(C2H6OS) )2)]. The SnIV atoms are then pentacoordinated, with a common trans trigonal-bipyramidal arrangement. The asymmetric unit contains one half-molecule, 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, C2O4 2-, which bridges the [(SnPh3)(DMSO)] moieties. The molecule crystallizes as a disordered system, with two phenyl rings disordered by rotation about their Sn-C bonds, while the DMSO molecule is split over two positions due to a tetrahedral inversion at the S atom. All disordered parts were refined with occupancies fixed of 0.5.