Peroxynitrous acid

Peroxynitrous acid

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Names
Preferred IUPAC name Peroxynitrous acid
Systematic IUPAC name (Hydridodioxido)oxidonitrogen
Identifiers
CAS Number	14691-52-2 Y
ChEBI	CHEBI:25942 Y
ChEMBL	ChEMBL1794794 Y
ChemSpider	109951 Y
Gmelin Reference	49207
Jmol 3D model	Interactive image
MeSH	Peroxynitrous+Acid
PubChem	123349
InChI InChI=1S/HNO3/c2-1-4-3/h3H Y Key: CMFNMSMUKZHDEY-UHFFFAOYSA-N Y
SMILES OON=O
Properties
Chemical formula	NHO 3
Molar mass	63.0128 −1
Related compounds
Related compounds	Nitroxyl Nitrous acid Nitrosyl bromide Nitrosyl chloride Nitrosyl fluoride
Except where otherwise noted, 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 pK_a 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. Peroxynitrous acid is also important in atmospheric chemistry.