Photophysical and Photochemical Properties of 2,3–Dihydro-4 (l H)-quinolinones. Part II. Rates and Mechanism of Primary Processes

Sn Bakalova, L. Biczok, T. Berces

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Abstract

Fluorescence quantum yields, singlet lifetimes and triplet yields for 2–methyl-2,3–dihydro-4(1 H)-quinolinone and N-methyl-2,3–dihydro-4(l H)-quinolinone were determined as a function of temperature. In non-polar solvents, an efficient non-radiative process identified as an indirect singlet –> triplet transition occurring through S2(n,π*) was found to depopulate the lowest S,(,π*π) state. In polar solvents, direct singlet –» triplet intersystem crossing appears to dominate. Photochemical dehydrogenation produced the corresponding 4(1 H)-quinolinone with a yield of few times 10–2. This was shown to be the only traceable reaction route.

Original languageEnglish
Pages (from-to)549-556
Number of pages8
JournalZeitschrift fur naturforschung - section c journal of biosciences
Volume46
Issue number7-8
DOIs
Publication statusPublished - Aug 1991

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Keywords

  • Dihydroquinolinones
  • Fluorescence Quantum Yields
  • Photochemical Dehydrogenation
  • Singlet Lifetimes
  • Triplet Yields

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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