Crystal structure of μ-oxalato-κ2O1:O2-bis[(dimethyl sulfoxide-κO)triphenyltin(IV)]

Abstract

In the previously reported [C2O4(SnPh3)2] complex [Diopet al.(2003).Appl. Organomet. Chem.17, 881–882.], the SnIVatoms 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 SnIVatoms are then pentacoordinated, with a commontranstrigonal–bipyramidal arrangement. The asymmetric unit contains one half-molecule, which is completed by inversion symmetry in space group typeC2/c. The inversion centre is placed at the mid-point of the central bis-monodentate oxalate dianion, C2O42−, 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.