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Peroxynitrous acid

Peroxynitrous acid (HNO3) is a reactive nitrogen species (RNS). It is the conjugate acid of peroxynitrite (ONOO−). It has a pKa of approximately 6.8. It is formed in vivo from the diffusion-controlled reaction of nitrogen monoxide (ON•) and superoxide (). It is an isomer of nitric acid and isomerises with a rate constant of 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.

References

N.Connelly and T. Damhus, IUPAC. ''Nomenclature of Inorganic Chemistry'', RSC Publishing, Cambridge, 2005
(16 September 2004). "Peroxynitrous Acid - Compound Summary". National Center for Biotechnology Information.
(2012). "Peroxynitrous acid: controversy and consensus surrounding an enigmatic oxidant". Dalton Transactions.

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nitrogen-oxoacids peroxy-acids nitrogen(iii)-compounds

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