Nitrosyl iodide

Nitrosyl iodide
Names
	IUPAC name Nitrosyl iodide
Identifiers
CAS Number	58585-94-7;
3D model (JSmol)	Interactive image;
ChemSpider	126649;
PubChem CID	143560;
CompTox Dashboard (EPA)	DTXSID80207297;
	InChI InChI=1S/INO/c1-2-3 Key: VBAXOVGEFYCYMW-UHFFFAOYSA-N;
	SMILES N(=O)I;
Properties
Chemical formula	INO
Molar mass	156.910 g·mol−1
Solubility in water	reacts with water
Hazards
	GHS labelling:
Pictograms
Related compounds
Related compounds	Nitroxyl; Nitrosyl chloride; Nitrosyl fluoride; Nitrosyl bromide;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Nitrosyl iodide is a chemical compound with the formula INO.^[1] Alongside nitryl iodide (INO₂), iodine nitrite (IONO), and iodine nitrate (IONO₂), it is a member of the INO_x (iodine nitrogen oxide) series of compounds, important intermediates and reservoir species in the atmospheric chemistry of iodine.^[2]^[3]^[4]

Synthesis

Nitrosyl iodide is formed in a reaction of nitric oxide with iodine:^[5]

2NO + I₂ → 2NOI

Other methods are also known.

Physical properties

The compound is soluble in organic solvents. It reacts with water.

The compound is unstable and quickly decomposes:^[6]

2NOI → 2NO + I₂

Nitrosyl iodide is believed to impact tropospheric ozone levels.^[3]

References

^ "Nitrosyl iodide". NIST. Retrieved 15 January 2026.
^ Ozeki, Hiroyuki; Bailleux, Stephane; Kobayashi, Kaori; Nishitsunoi, Akiko (22 June 2021). "Hyperfine Structure of Nitrosyl Iodide (INO)". Proceedings of the 2021 International Symposium on Molecular Spectroscopy. International Symposium on Molecular Spectroscopy (Virtual). p. 1. Bibcode:2021isms.confEFD04N. doi:10.15278/isms.2021.FD04. hdl:2142/111294. ISBN 978-1-7138-3523-3. Retrieved 15 January 2026.
^ ^a ^b Bailleux, S.; Duflot, D.; Aiba, S.; Nakahama, S.; Ozeki, H. (16 April 2016). "Nitrosyl iodide, INO: A combined ab initio and high-resolution spectroscopic study". Chemical Physics Letters. 650: 73–75. Bibcode:2016CPL...650...73B. doi:10.1016/j.cplett.2016.02.069. ISSN 0009-2614. Retrieved 15 January 2026.
^ Davis, D.; Crawford, J.; Liu, S.; McKeen, S.; Bandy, A.; Thornton, D.; Rowland, F.; Blake, D. (20 January 1996). "Potential impact of iodine on tropospheric levels of ozone and other critical oxidants" (PDF). Journal of Geophysical Research: Atmospheres. 101 (D1): 2135–2147. doi:10.1029/95JD02727.
^ Advances in Physical Organic Chemistry. Academic Press. 30 December 1982. p. 403. ISBN 978-0-08-058158-3. Retrieved 15 January 2026.
^ Wiberg, Egon; Wiberg, Nils (2001). Inorganic Chemistry. Academic Press. p. 666. ISBN 978-0-12-352651-9. Retrieved 15 January 2026.

[1] "Nitrosyl iodide". NIST. Retrieved 15 January 2026.

[Ozeki2021-2] Ozeki, Hiroyuki; Bailleux, Stephane; Kobayashi, Kaori; Nishitsunoi, Akiko (22 June 2021). "Hyperfine Structure of Nitrosyl Iodide (INO)". Proceedings of the 2021 International Symposium on Molecular Spectroscopy. International Symposium on Molecular Spectroscopy (Virtual). p. 1. Bibcode:2021isms.confEFD04N. doi:10.15278/isms.2021.FD04. hdl:2142/111294. ISBN 978-1-7138-3523-3. Retrieved 15 January 2026.

[Bailleux2026-3] Bailleux, S.; Duflot, D.; Aiba, S.; Nakahama, S.; Ozeki, H. (16 April 2016). "Nitrosyl iodide, INO: A combined ab initio and high-resolution spectroscopic study". Chemical Physics Letters. 650: 73–75. Bibcode:2016CPL...650...73B. doi:10.1016/j.cplett.2016.02.069. ISSN 0009-2614. Retrieved 15 January 2026.

[Davis1996-4] Davis, D.; Crawford, J.; Liu, S.; McKeen, S.; Bandy, A.; Thornton, D.; Rowland, F.; Blake, D. (20 January 1996). "Potential impact of iodine on tropospheric levels of ozone and other critical oxidants" (PDF). Journal of Geophysical Research: Atmospheres. 101 (D1): 2135–2147. doi:10.1029/95JD02727.

[5] Advances in Physical Organic Chemistry. Academic Press. 30 December 1982. p. 403. ISBN 978-0-08-058158-3. Retrieved 15 January 2026.

[6] Wiberg, Egon; Wiberg, Nils (2001). Inorganic Chemistry. Academic Press. p. 666. ISBN 978-0-12-352651-9. Retrieved 15 January 2026.

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