Note on the Structure of the Trithionate Group, (S3O6)—2

The structure of the trithionate group is found from a complete determination of the crystal lattice of the potassium compound. Two of the sulphur atoms form four bonds each, three bonds with oxygen atoms and one with sulphur. The four bonds are directed towards the corners of a tetrahedron. The third sulphur atom forms only two bonds, both with sulphur atoms; the bond angle is 103°. The S–O distance is 1.50A and the S–S distance 2.15A. Some features of the binding in sulphur-oxygen radicals are briefly discussed.