Photochemical behavior of 2-[2-(2-pyridyl)ethenyl]indole on triplet sensitization. Spin multiplicity dependence of the isomerization modes of an intramolecularly hydrogen-bonded compound

Tatsuo Arai*, Masaki Obi, Takeshi Iwasaki, Katsumi Tokumaru, Frederick D. Lewis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Although 2-[2-(2-pyridyl) ethenyl] indole undergoes one-way E→Z isomerization in the excited singlet state, it isomerizes between the E and Z isomers in the excited triplet state. On the basis of the determination of the quantum yields of isomerization and the photostationary state isomer ratios, as well as transient spectroscopic measurements, the potential energy surfaces for E-Z isomerization in the triplet state have been proposed. Specific rotamers of the E and Z isomers are found to be responsible for the triplet state isomerization reactions.

Original languageEnglish (US)
Pages (from-to)65-69
Number of pages5
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume96
Issue number1-3
DOIs
StatePublished - May 31 1996

Keywords

  • Intramolecular hydrogen bond
  • Isoraerization
  • T-T absorption

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

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