Synthesis, vibrational spectra, and X-ray crystal structure of di-µ-hydroxobis[bromodichloro(tetrahydrofuran)tin(IV)]–tetrahydrofuran (1/2)

Abstract

Colourless crystals of [SnCl2Br(OH)(thf)]2·2thf were obtained by careful hydrolysis of SnCl2Br(CN)(thf) in tetrahydrofuran (thf) solution. The crystal structure has been solved and refined to R= 0.046, based on 3 087 observed reflections. The structure consists of centrosymmetric dimeric molecules in which the tin atoms are fac-octahedrally co-ordinated by three halides [Sn–X 2.426(1), 2.411(2), and 2.446(2)Å; X = disordered Cl and Br], two bridging OH groups [Sn–0 2.086(5) and 2.066(4)Å], and a thf molecule [Sn–0 2.211(4)Å]. Two additional thf molecules are hydrogen bonded to the OH groups [O(2)⋯ O(3) 2.587(6)Å]. Vibrational spectra are consistent with the dimeric framework with OH bridges, the rather strong hydrogen bonds, and the existence of two different types of thf molecules.