Radical species derived from phenalenone: Characterization and role of upper excited states

Cristina Flors, Santi Nonell

Research output: Indexed journal article Articlepeer-review

18 Citations (Scopus)

Abstract

The reactivity of triplet phenalenone (PN) towards typical H- and electron-donors is characterized by means of nanosecond laser flash-photolysis. H-abstraction from tributylstannane occurs with a rate constant of ca. 5×105 M-1 s-1. From the activation energy for this reaction, an upper limit for the T2-T1 energy gap is calculated as 9±1 kJ mol-1 in nonpolar solvents, consistent with the solvent-insensitive high ΦT value in phenalenone. Triplet phenalenone also reacts via photoinduced electron transfer with 1,4-diazabicyclo[2.2.2]octane (DABCO) with rate constant close to the diffusional control limit. The spectrum of the solvated free radical anion of phenalenone has a maximum at 440 nm in acetonitrile.

Original languageEnglish
Pages (from-to)9-12
Number of pages4
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume163
Issue number1-2
DOIs
Publication statusPublished - 15 Apr 2004

Keywords

  • Aromatic ketone
  • Hydrogen abstraction
  • Ketyl radical
  • Phenalenone
  • Photoinduced electron transfer
  • Radical anion

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