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Iodine oxide

Iodine oxides are chemical compounds and oxides of iodine. There exist multiple oxides as iodine has more than one oxidation state.

	I₂O₄	I₃O₅	I₄O₉
Synonyms	diiodine pentaoxide	triiodine pentaoxide	tetraiodine nonaoxide
CAS registry		12029-98-0
Appearance		crystalline solid
Oxidation state	+4	+5	+6
Melting point	decomp. 75°C	decomp. 300 - 350°C	> 100°C
Specific gravity	4.2	4.8
Solubility water	decomp. to HIO₃ + I₂	187 g/100 ml
Iodine oxides ^[1].

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The iodide oxide free radical (IO) is a known Ozone depletion agent ^[2]. Atmospheric iodine containing compounds form iodine radicals which react with ozone to iodine oxide radicals (IO) and oxygen. The IO radicals then in turn participate in other ozone consuming chemical reactions.

References

^ Lide, D. R. (Ed.) (2005). CRC Handbook of Chemistry and Physics (86th Edn.). Boca Raton (FL):CRC Press. ISBN 0-8493-0486-5.
^ Halogens Hover In Antarctic Iodine oxide and bromine oxide deplete atmospheric ozone Rachel Petkewich Chemical & Engineering News July 23, 2007 Volume 85, Number 30 p. 9 http://pubs.acs.org/cen/news/85/i30/8530notw4.html