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Iodine monoxide

Names
Other names Iodine(II) oxide, iodosyl, oxidoiodine
Identifiers
CAS Number	14696-98-1
3D model (JSmol)	Interactive image
ChEBI	CHEBI:29896
ChemSpider	4574060
Gmelin Reference	1170
PubChem CID	5460557
CompTox Dashboard (EPA)	101316449
InChI InChI=1S/IO/c1-2Key: AFSVSXMRDKPOEW-UHFFFAOYSA-N
SMILES I
Properties
Chemical formula	IO
Molar mass	142.903 g·mol
Appearance	purple gas
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Iodine monoxide is a binary inorganic compound of iodine and oxygen with the chemical formula IO•. A free radical, this compound is the simplest of many iodine oxides. It is similar to the oxygen monofluoride, chlorine monoxide and bromine monoxide radicals.

Synthesis

Iodine monoxide can be obtained by the reaction between iodine and oxygen:

I₂ + O₂ → 2 IO

Chemical properties

Iodine monoxide decomposes to its prime elements:

2 IO → I₂ + O₂

Iodine monoxide reacts with nitric oxide:

2 IO + 2 NO → I₂ + 2 NO₂

Atmosphere

Atmospheric iodine atoms (e.g. from iodomethane) can react with ozone to produce the iodine monoxide radical:

I₂ + 2 O₃ → 2 IO + 2 O₂

This process can contribute to ozone depletion.

References

1. Dix, Barbara; Baidar, Sunil; Bresch, James F.; Hall, Samuel R.; Schmidt, K. Sebastian; Wang, Siyuan; Volkamer, Rainer (5 February 2013). "Detection of iodine monoxide in the tropical free troposphere". Proceedings of the National Academy of Sciences. 110 (6): 2035–2040. doi:10.1073/pnas.1212386110. ISSN 0027-8424. PMC 3568334.
2. "Iodine oxide". NIST.
3. Haynes, William M. (9 June 2015). CRC Handbook of Chemistry and Physics, 96th Edition. CRC Press. p. 2-17. ISBN 978-1-4822-6097-7. Retrieved 27 March 2023.
4. Nikitin, I. V. (13 March 2008). "HALOGEN MONOXIDES" (in Russian). Institute of Problems of Chemical Physics, Russian Academy of Sciences. Retrieved 27 March 2023.
5. ^ Brasseur, Guy P.; Solomon, Susan (28 December 2005). Aeronomy of the Middle Atmosphere: Chemistry and Physics of the Stratosphere and Mesosphere. Springer Science & Business Media. p. 379. ISBN 978-1-4020-3824-2. Retrieved 27 March 2023.
6. "The Atmospheric Chemistry of Iodine Monoxide" (PDF). NIST. Retrieved 27 March 2023.

• Iodine compounds
• Diatomic molecules
• Oxides
• Free radicals