(Phenyl-iodos-yl)benzene tosyl-ate dihydrate.

The structure of the title salt (systematic name: oxodiphenyl-λ 5 -iodanylium 4-methyl-benzene-sulfonate 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 mol-ecular structure features an angular (phenyl-iodos-yl)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.