Time-resolved EPR and laser photolysis investigations of photoinduced ω-bond dissociation in an aromatic carbonyl compound having triplet π,π* character

Minoru Yamaji, Susumu Inomata, Satoru Nakajima, Kimio Akiyama, Shozo Tero-Kubota, Seiji Tobita, Bronislaw Marciniak

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Photochemical properties of photoinduced ω-bond dissociation in p-phenylbenzoylbenzyl phenyl sulfide (PPS) having the lowest triplet state (T1) of π,π* character in solution were investigated by time-resolved EPR and laser flash photolysis techniques. PPS was found to undergo photoinduced ω-bond cleavage in the excited lowest singlet state (S1(n,π*)) with a quantum yield (Φrad) of 0.15 for the radical formation, which was independent of excitation wavelengths. Based on the facts of the observation of the absorption spectrum of triplet PPS upon triplet sensitization of xanthone, and absence of CIDEP signal, ω-cleavage was shown to be absent in the T1(π,π*) state of PPS. Considering the electronic character of the excited and dissociative states of PPS, a schematic energy diagram for the ω-bond dissociation of PPS was shown.

Original languageEnglish
Pages (from-to)211-216
Number of pages6
JournalChemical Physics Letters
Volume417
Issue number1-3
DOIs
Publication statusPublished - 2006 Jan 9

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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