Peroxynitrous acid

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Peroxynitrous acid
CAS number 14691-52-2 YesY
PubChem 123349
ChemSpider 109951 YesY
MeSH Peroxynitrous+Acid
ChEBI CHEBI:25942 YesY
Gmelin Reference 49207
Jmol-3D images Image 1
Molecular formula NHO
Molar mass 63.0128 −1
Related compounds
Related compounds
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Peroxynitrous acid (HNO3) is a reactive nitrogen-containing species (RNS). It is the conjugate acid of peroxynitrite (ONOO). It has a pKa of ~6.8. It is formed in vivo from the diffusion-controlled reaction of nitrogen monoxide (NO·) and superoxide (O2•–). It isomerises with k = 1.2 s−1, a process whereby up to 5% of hydroxyl and nitrogen dioxide radicals may be formed. It oxidises and nitrates aromatic compounds in low yield. The mechanism may involve a complex between the aromatic compound and ONOOH, and a transition from the cis- to the trans-configuration of ONOOH.[3] Peroxynitrous acid is also important in atmospheric chemistry.


  1. ^ N.Connelly and T. Damhus, IUPAC. Nomenclature of Inorganic Chemistry, RSC Publishing, Cambridge, 2005
  2. ^ "Peroxynitrous Acid - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 16 September 2004. Identification and Related Records. Retrieved 11 April 2012. 
  3. ^ W. H. Koppenol, P. L. Bounds, T. Nauser, R. Kissner, H. Rüegger, Peroxynitrous acid: controversy and consensus surrounding an enigmatic oxidant, Dalton Trans., 2012, 41, 13779-13787.