Diiodosyl sulfate

Diiodosyl sulfate is an inorganic compound, a basic salt of iodine and sulfuric acid with the formula ₂SO₄. It forms yellow crystals.

Synthesis

Reaction of iodic and sulfuric acids :
Passing ozonized oxygen through a solution of iodine in sulfuric acid:

Physical properties

Diiodosyl sulfate forms yellow hygroscopic crystals and is poorly soluble in cold water.
It dissolves in and can be recrystallized from concentrated sulfuric acid.

Chemical properties

Under the influence of atmospheric moisture, diiodosyl sulfate hydrolyzes with the release of iodine, iodic and sulfuric acids.
It decomposes when heated:
It reacts with sulfur trioxide:
With concentrated sulfuric acid, it forms an acidic salt: