Iodine monoxide

Iodine monoxide is a binary inorganic compound of iodine and oxygen with the chemical formula IO•. A free radical, it is the simplest of many iodine oxides.[1][2][3] It is similar to the chlorine monoxide and bromine monoxide radicals.

This article is about the compound IO. For the oxoanion with the formula IO−, see hypoiodite. For the molecule I2O, see Diiodine monoxide.
Iodine monoxide
Names
Other names
Iodine(II) oxide, iodosyl, oxidoiodine
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
1170
  • InChI=1S/IO/c1-2
    Key: AFSVSXMRDKPOEW-UHFFFAOYSA-N
  • [O]I
Properties
IO
Molar mass 142.903 g·mol−1
Appearance purple gas
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Synthesis

A reaction of iodine and oxygen[4]

Chemical properties

IO decomposes to prime elements:

IO → I + O

IO reacts with NO:[5]

IO + NO → I + NO2

Atmosphere

Atmospheric iodine atoms (e.g. from iodomethane) can react with ozone to produce the iodine monoxide radical:[6][5]

I + O3 → IO + O2

This process contributes 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.
  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.
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