The reaction of ONOO- with carbonyls: Estimation of the half-lives of ONOOC(O)O- and O2NOOC(O)O
2002 (English)In: Journal of the Chemical Society. Dalton Transactions, ISSN 1472-7773, E-ISSN 1470-479X, no 5, 808-810 p.Article in journal (Refereed) Published
The equilibrium constant for the formation of an adduct between a carbonyl and a hydroperoxide ion varies linearly with the acid dissociation constant of the hydroperoxide. Based on this relationship, the half-life of the adduct formed between ONOO- and CO2, ONOOC(O)O-, is estimated to be shorter than 100 ns. Consequently, this adduct should not play any role whatsoever in chemical or biological systems. O2NOO- and CO2 are believed to be involved in a fast equilibrium reaction forming an adduct, O2NOOC(O)O-. This adduct does not appear to homolyse either along the O-O or the N-O bond. Furthermore, at realistic CO2 concentrations, the equilibrium should be shifted far to the O2NOO- + CO2 side. Therefore, the rate of self-decomposition of O2NOO- into NO2- and O-2 is unaffected by the presence of bicarbonate.
Place, publisher, year, edition, pages
2002. no 5, 808-810 p.
biological-activity, peroxynitrous acid, radical production, pulse-radiolysis, dioxide, mechanism, oxidation, decay, decomposition, bicarbonate
IdentifiersURN: urn:nbn:se:kth:diva-21427ISI: 000174708400022OAI: oai:DiVA.org:kth-21427DiVA: diva2:340125
QC 201005252010-08-102010-08-10Bibliographically approved