Diiodosyl sulfate

Diiodosyl sulfate
Names
Other names
Iodosyl sulfate
Identifiers
3D model (JSmol)
  • [I+]=O.[I+]=O.[O-]S([O-])(=O)=O
Properties
(IO)2SO4
Molar mass 381.87 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Diiodosyl sulfate is an inorganic compound, a basic salt of iodine and sulfuric acid with the formula (IO)2SO4. It forms yellow crystals.[1]

Synthesis

Reaction of iodic and sulfuric acids :

2 HIO3 + H2SO4 → (IO)2SO4 + O2 + 2 H2O

Passing ozonized oxygen through a solution of iodine in sulfuric acid:

I2 + 3 O3 + H2SO4 → (IO)2SO4 + 3 O2 + H2O

Physical properties

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.

Chemical properties

Under the influence of atmospheric moisture, diiodosyl sulfate hydrolyzes with the release of iodine, iodic and sulfuric acids.

It decomposes when heated:[3]

4(IO) 2 SO 4 → 2I2O5 + 2I2 + 4SO3 + O2

It reacts with sulfur trioxide:[4]

(IO)2SO4 + 2SO3 → I2(SO4)3

With concentrated sulfuric acid, it forms an acidic salt:

(IO)2SO4 + H2SO4 → 2 IOHSO4

References

  1. ^ Gillespie, R. J.; Senior, J. B. (July 5, 1964). "Cations and Oxy Cations of Iodine. II. Solutions of Iodosyl Sulfate, Iodine Dioxide, and Iodic Acid-Iodine Mixtures in Sulfuric Acid and Dilute Oleum". Inorganic Chemistry. 3 (7): 972–977. doi:10.1021/ic50017a010 – via CrossRef.
  2. ^ "Chemistry of inorganic sulfonates and sulfates of polyvalent iodine". Russian Chemical Reviews 66. 1997.
  3. ^ Dasent, W. E.; Waddington, T. C. (January 1, 1960). "670. Iodine oxygen compounds. Part II. Iodosyl and related compounds". Journal of the Chemical Society (Resumed): 3350–3356. doi:10.1039/JR9600003350 – via pubs.rsc.org.
  4. ^ Argument, Cyril (1944). "The iodous sulphates". Durham theses. Durham University. p. 22.