Diiodosyl sulfate is an inorganic compound, a basic salt of iodine and sulfuric acid with the formula (IO)2SO4.
[1] Reaction of iodic and sulfuric acids : Passing ozonized oxygen through a solution of iodine in sulfuric acid: Diiodosyl sulfate forms yellow hygroscopic crystals and is poorly soluble in cold water.
[2] It dissolves in and can be recrystallized from concentrated sulfuric acid.
Under the influence of atmospheric moisture, diiodosyl sulfate hydrolyzes with the release of iodine, iodic and sulfuric acids.
It decomposes when heated:[3] It reacts with sulfur trioxide:[4] With concentrated sulfuric acid, it forms an acidic salt: