title: Formation of hydroxyl radicals by irradiated 1-nitronaphthalene (1NN): oxidation of hydroxyl ions and water by the 1NN triplet state.
abstract: The excited triplet state of 1-nitronaphthalene ((3)1NN*) reacts with OH(-) with a second-order reaction rate constant of (1.66 ± 0.08)×10(7) M(-1) s(-1) (μ±σ). The reaction yields the ˙OH radical and the radical anion 1NN(-)˙. In aerated solution, the radical 1NN(-)˙ would react with O(2) to finally produce H(2)O(2) upon hydroperoxide/superoxide disproportionation. The photolysis of H(2)O(2) is another potential source of ˙OH, but such a pathway would be a minor one in circumneutral (pH 6.5) or in basic solution ([OH(-)] = 0.3-0.5 M). The oxidation of H(2)O by (3)1NN*, with rate constant 3.8 ± 0.3 M(-1) s(-1), could be the main ˙OH source at pH 6.5.
authors.affiliation: Dipartimento di Chimica Analitica, Università di Torino, Italy.
authors.forename: Babita
authors.initials: B
authors.lastname: Sur
authors.forename: Maura
authors.initials: M
authors.lastname: Rolle
authors.forename: Claudio
authors.initials: C
authors.lastname: Minero
authors.forename: Valter
authors.initials: V
authors.lastname: Maurino
authors.forename: Davide
authors.initials: D
authors.lastname: Vione
authors.forename: Marcello
authors.initials: M
authors.lastname: Brigante
authors.forename: Gilles
authors.initials: G
authors.lastname: Mailhot
mesh_terms: D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D006878:Hydroxides / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000737:chemistry*; D009281:Naphthalenes / Q000737:chemistry*; D010084:Oxidation-Reduction; D010782:Photolysis; D011789:Quantum Theory; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry*
chemical_list: D006878:Hydroxides; D009281:Naphthalenes; D014867:Water; D017665:Hydroxyl Radical; C031356:hydroxide ion; C016614:1-nitronaphthalene; D006861:Hydrogen Peroxide