The crystal structure of di-µ-ethanethiolato-µ-sulphido-bis[dichloro-(tetrahydrothiophen)tungsten( IV )(W–W)]: a confacial bioctahedral complex with a tungsten-to-tungsten bond

The complex [(C4H8S) Cl2W(µ-S)(µ-SEt)2WCl2(SC4H8)] has been prepared by reaction of [WCl4(C4H8S)2] with one mole equivalent of SiMe3(SEt) in CH2Cl2 solution. A single-crystal X-ray diffraction study shows that the molecule has a confacial bioctahedral structure with a W–W bond length of 2.524(1)Å. The structure has been solved by heavy-atom methods from automated diffractometer data, and refined to R 0.025 (R′ 0.037) for 1 593 reflections. The complex crystallizes in the orthorhombic system, space group Pnam, with a= 10.592(3), b= 12.618(4), c= 17.430(6)Å, and Z= 4.