title: Photophysics and photochemistry of the β-lapachone derived diphenyldihydrodioxin: generation and characterization of its cation radical.
abstract: The photophysics and photochemistry of the β-lapachone derived diphenyldihydrodioxin 3 were investigated using steady-state and time resolved techniques. Laser excitation of 3 leads to the formation of its cation radical 4 (absorption maxima at 410 and 450 nm and a lifetime of 10 μs), which was confirmed by its thermal generation employing tris(2,4-dibromophenyl)-aminium hexachloroantimonate (BAHA) as the electron acceptor. The cation radical 4 was also formed via the triplet excited state of 3 through a triplet sensitized process using benzophenone (ET = 69 kcal mol(-1)) as the sensitizer.
authors.affiliation: Departamento de Química - Universidade Federal Rural do Rio de Janeiro, Antiga Rio São Paulo, km 47, Seropédica 23970-000 RJ, Brazil. jcnetto@ufrrj.br.
authors.forename: José Carlos
authors.initials: JC
authors.lastname: Netto-Ferreira
authors.forename: Virginie
authors.initials: V
authors.lastname: Lhiaubet-Vallet
authors.forename: Bauer
authors.initials: B
authors.lastname: Bernardes
authors.forename: Aurelio Baird Buarque
authors.initials: AB
authors.lastname: Ferreira
authors.forename: Miguel Ángel
authors.initials: MÁ
authors.lastname: Miranda