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

Chih Wei Chang; Theis I. Sølling; Wei-Guang Diau

doi:10.1016/j.cplett.2017.07.039

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

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	218-222
Number of pages	5
Journal	Chemical Physics Letters
Volume	686
DOIs	https://doi.org/10.1016/j.cplett.2017.07.039
State	Published - 16 Oct 2017

Keywords

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

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title = "Revisiting the photophysics of 9-fluorenone: Ultrafast time-resolved fluorescence and theoretical studies",

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.",

keywords = "Fluorenone, Intersystem crossing, Time-resolved fluorescence spectroscopy, Time-resolved mass spectroscopy",

author = "Chang, {Chih Wei} and S{\o}lling, {Theis I.} and Wei-Guang Diau",

year = "2017",

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doi = "10.1016/j.cplett.2017.07.039",

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AU - Sølling, Theis I.

AU - Diau, Wei-Guang

PY - 2017/10/16

Y1 - 2017/10/16

N2 - 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.

AB - 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.

KW - Fluorenone

KW - Intersystem crossing

KW - Time-resolved fluorescence spectroscopy

KW - Time-resolved mass spectroscopy

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