Preparation and Crystal Structure of cis-Tetrachlorobis(cyclooctasulfurmonoxide)tin(IV)

Abstract

Abstract Yellow crystals of cis-[SnCl4(S8 O)2] containing the homocyclic sulfur oxide S8O have been prepared from the com ponents in carbon disulfide at -35 °C. An X-ray structural analysis carried out at -105 °C showed the com pound to be monoclinic, space group P21/n with Z = 4 in a unit cell of dimensions a = 821.2(2) pm, b = 1331.9(4) pm , c = 2071.7(6) pm and β = 91.82(2)°. The structure was refined to a final agreement factor R = 0.038 for 2022 reflections. The tin atom is surrounded by a distorted octahedron of two oxygen atoms in cw-positions and four chlorine atoms in accordance with other oxygen-bonded complexes of SnCl4. The molecular symmetry is approximately C2, and the SS bond lengths in the ligands vary between 201 and 218 pm. Vibrational spectra of [SnCl4(S8O)2] are reported. The title compound is the second example containing S8O as a ligand.