title: Spin trapping of nitrogen dioxide and of radicals generated from nitrous acid.
abstract: Spin trapping of nitrogen dioxide radical by several nitrones has been studied. The reaction results in the formation of persistent acyl nitroxides, after the oxidation of the intermediate spin adducts having an -ONO group on C-2 atom. The intermediate is effectively detected when DEPMPO is used as the spin trap. The reaction between PBN or 5,7-di-tert-butyl-3,3-dimethyl indoline N-oxide with nitrous acid gives the corresponding acyl nitroxide only when oxygen is present in the reaction milieu. On the other hand, nitroso spin traps do not trap *NO2 confirming that the unpaired electron of nitrogen dioxide is localized on the oxygen atom.
authors.affiliation: Dipartimento di Scienze dei Materiali e della Terra, Università Politecnica delle Marche, Via Brecce Bianche, I-60131, Ancona, Italy.
authors.forename: Paola
authors.initials: P
authors.lastname: Astolfi
authors.forename: Lucedio
authors.initials: L
authors.lastname: Greci
authors.forename: Maria
authors.initials: M
authors.lastname: Panagiotaki
mesh_terms: D004578:Electron Spin Resonance Spectroscopy / Q000379:methods; D005609:Free Radicals / Q000138:chemical synthesis / Q000737:chemistry; D009585:Nitrogen Dioxide / Q000138:chemical synthesis / Q000737:chemistry*; D009608:Nitrous Acid / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D019097:Spin Trapping / Q000379:methods*
chemical_list: D005609:Free Radicals; D009585:Nitrogen Dioxide; D010100:Oxygen; D009608:Nitrous Acid