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Iodine dioxide

Names
Other names dioxidoiodide, iodyl, iodoxy radical, iodine peroxide, iodine superoxide
Identifiers
CAS Number	13494-92-3
3D model (JSmol)	Interactive image
ChEBI	CHEBI:29901
ChemSpider	4574133
Gmelin Reference	404604
PubChem CID	5460638
InChI InChI=1S/IO2/c2-1-3Key: WXDJHDMIIZKXSK-UHFFFAOYSA-N
SMILES O=I
Properties
Chemical formula	IO2
Molar mass	158.902 g·mol
Appearance	yellow solid
Density	4.2 g/cm
Melting point	130 °C (266 °F; 403 K)
Solubility in water	reacts with water
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Iodine dioxide is a binary inorganic compound of iodine and oxygen with the chemical formula IO
₂. Only stable as a dilute gas, this compound is one of many iodine oxides, and "iodine dioxide" is sometimes used to describe its formal dimer, the salt diiodine tetroxide (I₂O₄, ).

It is formed, in parts-per-trillion quantities, at the marine boundary layer and believed to mediate particulate nucleation therein. The iodine, originally from algaeic diiodomethane, is photooxidized to iodine monoxide, which then disproportionates to free iodine atoms and iodine dioxide. At a sufficiently large concentration, the particles then combine to form small grains of diiodine tetroxide.

References

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. ^ Hoffmann, Thorsten; O'Dowd, Colin D.; Seinfeld, John H. (15 May 2001). "Iodine oxide homogeneous nucleation: An explanation for coastal new particle production" (PDF). Geophysical Research Letters. 28 (10): 1949–1952. Bibcode:2001GeoRL..28.1949H. doi:10.1029/2000GL012399.
4. De, Anil Kumar (2007). A Textbook Of Inorganic Chemistry. New Age International. p. 584. ISBN 978-81-224-1384-7. Retrieved 10 May 2023.
5. Parks, Lytle Raymond (1952). Systematic College Chemistry. Blakiston Company. p. 304. Retrieved 10 May 2023.
6. Saiz-Lopez, A.; Fernandez, R. P.; Ordóñez, C.; Kinnison, D. E.; Gómez Martín, J. C.; Lamarque, J.-F.; Tilmes, S. (10 December 2014). "Iodine chemistry in the troposphere and its effect on ozone". Atmospheric Chemistry and Physics. 14 (23): 13119–13143. Bibcode:2014ACP....1413119S. doi:10.5194/acp-14-13119-2014. hdl:11336/100317.
7. Cox, R. A.; Bloss, W. J.; Jones, R. L.; Rowley, D. M. (1 July 1999). "OIO and the atmospheric cycle of iodine" (PDF). Geophysical Research Letters. 26 (13): 1857–1860. Bibcode:1999GeoRL..26.1857C. doi:10.1029/1999GL900439. S2CID 128402214.

• Iodine compounds
• Oxides