Iodine dioxide
Other names
dioxidoiodide, iodyl, iodoxy radical, iodine peroxide, iodine superoxide
3D model (JSmol)
  • InChI=1S/IO2/c2-1-3
  • O=I[O]
Molar mass 158.902 g·mol−1
Appearance yellow solid
Density 4.2 g/cm3
Melting point 130 °C (266 °F; 403 K)
reacts with water
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Iodine dioxide is a binary inorganic compound of iodine and oxygen with the chemical formula IO
.[1][2] This compound is one of many iodine oxides.[3][4]


The compound can be prepared by reacting sulphuric acid with iodic acid or by the action of concentrated nitric acid upon dry powedered iodine.[5]

Physical properties

It forms yellow crystalline solid. Reacts with water.[5][6] Iodine dioxide has an irritating effect, can be found in the wastes from the production of certain pharmaceuticals.[7]


  1. ^ Yaws, Carl (6 January 2015). The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals: Physical Properties for More Than 54,000 Organic and Inorganic Chemical Compounds, Coverage for C1 to C100 Organics and Ac to Zr Inorganics. Gulf Professional Publishing. p. 718. ISBN 978-0-12-801146-1. Retrieved 10 May 2023.
  2. ^ Haynes, William M. (19 April 2016). CRC Handbook of Chemistry and Physics. CRC Press. p. 2-17. ISBN 978-1-4398-8050-0. Retrieved 10 May 2023.
  3. ^ De, Anil Kumar (2007). A Textbook Of Inorganic Chemistry. New Age International. p. 584. ISBN 978-81-224-1384-7. Retrieved 10 May 2023.
  4. ^ Parks, Lytle Raymond (1952). Systematic College Chemistry. Blakiston Company. p. 304. Retrieved 10 May 2023.
  5. ^ a b Holmyard, E. J. (1931). Inorganic Chemistry. Edward Arnold & Co. p. 521. ISBN 978-5-87636-953-6. Retrieved 10 May 2023.
  6. ^ Perry, Dale L. (19 April 2016). Handbook of Inorganic Compounds. CRC Press. p. 210. ISBN 978-1-4398-1462-8. Retrieved 10 May 2023.
  7. ^ Grushko, Ya M. (10 September 2020). Handbook of Dangerous Properties of Inorganic And Organic Substances in Industrial Wastes. CRC Press. ISBN 978-1-000-15473-3. Retrieved 10 May 2023.