Iodite

Iodite
Names
	IUPAC name iodite
	Systematic IUPAC name dioxidoiodate(1-)
Identifiers
CAS Number	20499-55-2;
3D model (JSmol)	Interactive image;
ChemSpider	4574132;
PubChem CID	5460637;
CompTox Dashboard (EPA)	DTXSID901031417 ;
	InChI InChI=1S/HIO2/c2-1-3/h(H,2,3)/p-1;
	SMILES [O-]I=O;
Properties
Chemical formula	IO2−
Molar mass	158.90327
Related compounds
Other anions	Chlorite ; Bromite
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Iodite is an anion composed of iodine and oxygen, with the chemical formula IO₂⁻. Within this ion the iodine exists in oxidation state III.

Iodites (including iodous acid) are highly unstable and have never been isolated.^[1] However they have been detected as intermediates in the conversion between iodide and iodate.^[2]^[3]

Other oxyanions

Iodine can assume oxidation states of −1, +1, +3, +5, or +7. A number of neutral iodine oxides are also known.

Iodine oxidation state	−1	+1	+3	+5	+7
Name	iodide	hypoiodite	iodite	iodate	periodate
Formula	I⁻	IO⁻	IO₂⁻	IO₃⁻	IO₄⁻ or IO₆⁵⁻

References

^ Ropp, R.C. (2013). Encyclopedia of the alkaline earth compounds. Oxford: Elsevier Science. p. 96. ISBN 0444595538.
^ Gupta, Yugul Kishore; Sharma, Devendra Nath (August 1971). "Kinetics and mechanism of the reduction of iodate to iodite by bromide in the presence of phenol". The Journal of Physical Chemistry. 75 (16): 2516–2522. doi:10.1021/j100685a018.
^ Gilles, Mary K.; Polak, Mark L.; Lineberger, W. C. (1992). "Photoelectron spectroscopy of the halogen oxide anions FO−, ClO−, BrO−, IO−, OClO−, and OIO−". The Journal of Chemical Physics. 96 (11): 8012. doi:10.1063/1.462352.

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[1] Ropp, R.C. (2013). Encyclopedia of the alkaline earth compounds. Oxford: Elsevier Science. p. 96. ISBN 0444595538.

[2] Gupta, Yugul Kishore; Sharma, Devendra Nath (August 1971). "Kinetics and mechanism of the reduction of iodate to iodite by bromide in the presence of phenol". The Journal of Physical Chemistry. 75 (16): 2516–2522. doi:10.1021/j100685a018.

[3] Gilles, Mary K.; Polak, Mark L.; Lineberger, W. C. (1992). "Photoelectron spectroscopy of the halogen oxide anions FO−, ClO−, BrO−, IO−, OClO−, and OIO−". The Journal of Chemical Physics. 96 (11): 8012. doi:10.1063/1.462352.

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