Solvento Complexes of Main Group Metals: The Structure of the Dimethyl-Sulfoxide Adduct of Indium(III) Perchlorate

Abstract

The title compound is readily obtained as a colourless , crystalline solid by recrystallization of hydrated indium perchlorate from dimethyl sulfoxide. The crystals are rhombohedral , space group R3, a 9.911(3)Ǻ, α 73.66(2)&3176;, Z= 1 f.u.;a single-crystal X-ray structure determination at 295 K refined to R 0.039 for 806 'observed' reflections. Unlike many Me₂SO complexes, the indium species contains nicely ordered cations , [In(Me₂SO)₆]³⁺. Indium lies on a site of 3 symmetry, with In-O 2.140(3)Ǻ and the angle between the oxygens related by the threefold axis being 94.2(1)°. Two independent perchlorate moieties are disordered about sites of 3 and 3 symmetry.