Influence of solvent polarity on the excited triplet states of nonphosphorescent 1,2-naphthoquinone and phosphorescent 9,10-phenanthrenequinone: Time-resolved triplet ESR and CIDEP studies

Hirami Shimoishi, Shozo Tero-Kubota, Kimio Akiyama, Yusaku Ikegami

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22 Citations (Scopus)

Abstract

The excited triplet states of 1,2-naphthoquinone and 9,10-phenanthrenequinone were observed in several glassy matrices at low temperatures by time-resolved ESR method. Notable solvent effects on the zfs parameters were observed, indicating the small energy separation between 3nπ* and 3ππ* states in these o-quinones. It was found that the T1 state has dominantly ππ* character in ethanol while it is an nπ* in nonpolar solvents. CIDEP spectra of the semiquinone radicals produced by photoinduced hydrogen abstraction from the solvent reflect the electronic character of the T1 states.

Original languageEnglish
Pages (from-to)5410-5414
Number of pages5
JournalJournal of physical chemistry
Volume93
Issue number14
DOIs
Publication statusPublished - 1989 Jan 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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