Iodite

Iodite

Names
IUPAC name iodite
Systematic IUPAC name dioxidoiodate(1−)
Identifiers
CAS Number	20499-55-2
3D model (Jmol)	Interactive image
ChemSpider	4574132
PubChem	5460637
InChI InChI=1S/HIO2/c2-1-3/h(H,2,3)/p-1
SMILES [O-]I=O
Properties
Chemical formula	IO− 2
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 IO−
2. 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^−	IO− 2	IO− 3	IO− 4 or IO5− 6

References

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.