Structural effects on the radiationless transition from the T1 states of tropone derivatives

Tadaaki Ikoma, Kimio Akiyama, Shozo Tero-Kubota, Yusaku Ikegami

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The T1 states of nonphosphorescent 2,3-benzotropone and phosphorescent 4,5-benzotropone were studied by a time-resolved EPR method. For 2,3-benzotropone, the observed magnetic parameters and the decay rate (the average decay rate 1.1 × 105 s-1 at 4.2 K) are very similar to those of the parent tropone. On the other hand, 4,5-benzotropone has different magnetic properties and a much slower radiationless decay rate (<30 s-1) than tropone. The mechanism of the fast radiationless transition between the T1 and S0 states of tropone has been discussed.

Original languageEnglish
Pages (from-to)303-305
Number of pages3
JournalJournal of physical chemistry
Issue number2
Publication statusPublished - 1993 Jan 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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