Revisiting the photophysics of 9-fluorenone: Ultrafast time-resolved fluorescence and theoretical studies

Chih Wei Chang*, Theis I. Sølling, Wei-Guang Diau

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Ultrafast intersystem crossing dynamics of fluorenone in gas and condensed phases were investigated by time-resolved mass spectrometry and fluorescence up-conversion spectroscopy. The former shows the ultrafast Franck-Condon relaxation and the internal conversion dynamics of isolated fluorenone in the gas phase. The latter reveals that the vibrational relaxation time is 2.2 ps and a 110 ps fluorescence lifetime of fluorenone in hexane. The fluorescence lifetime in acetonitrile and dimethylsulfoxide is 16 ns and 15.1 ns, respectively. The potential energy surface along the C[dbnd]O out of plane bending motion shows that this coordinate is important for ISC in both polar and non-polar solvents.

Original languageEnglish
Pages (from-to)218-222
Number of pages5
JournalChemical Physics Letters
Volume686
DOIs
StatePublished - 16 Oct 2017

Keywords

  • Fluorenone
  • Intersystem crossing
  • Time-resolved fluorescence spectroscopy
  • Time-resolved mass spectroscopy

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