Crystal structure of chlorodifluoro-oxosulphur(VI) hexafluoroarsenate(V) OSClF2+AsF6–

Abstract

The crystal structure of the title compound has been determined from three-dimensional diffnctometer data. Crystals are monoclinic, space group P2₁/n, with unit cell dimensions: a= 9·96(1), b= 8·94(1), c= 8·295(9)Å, β= 95·70(5)°, and Z= 4. The atomic parameters were refined by block-diagonal least-squares to R 0·045 for 304 observed reflections. The structure consists of discrete OSClF₂⁺ and AsF₅^– ions. The OSClF₂⁺ group is a distorted tetrahedron, the S–Cl bond distance is the shortest so far reported, 1·86(1)Å. The fluorine and oxygen positions cannot be determined uniquely owing to disorder by rotation about the S–Cl axis. There is a short inter-ionic contact Cl ⋯ F(AsF₅^–) of 2·67(2)Å.