(Phenyliodosyl)benzene tosylate dihydrate

The structure of the title salt (systematic name: oxodiphenyl-λ 5 -iodanylium 4-methylbenzenesulfonate dihydrate), C 12 H 10 IO + ·C 7 H 7 O 3 S − ·2H 2 O, at 150 K, has monoclinic ( P 2 1 / c ) symmetry. The molecular structure features an angular (phenyliodosyl)benzene cation, the geometry of which was hitherto undescribed in the literature: in the cation, both I—C bonds are approximately normal to the I=O bond, forming a C—I—C angle of 95.36 (4)°. The crystal structure displays O—H...O, O—H...I and O—H...S hydrogen bonding.