Ultrafast excited-state dynamics of phenyleneethynylene oligomers in solution
- Duvanel, Guillaume Department of Physical Chemistry of the University of Geneva, Switzerland
- Grilj, Jakob Department of Physical Chemistry of the University of Geneva, Switzerland
- Schuwey, Anne Department of Chemistry of the University of Fribourg, Switzerland
- Gossauer, Albert Department of Chemistry of the University of Fribourg, Switzerland
- Vauthey, Eric Department of Physical Chemistry of the University of Geneva, Switzerland
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27.04.2007
Published in:
- Photochemical & Photobiological Sciences. - 2007, vol. 6, p. 956-963
English
The excited-state dynamics of oligomeric phenyleneethynylenes (OPEs) of various length and substitution has been investigated by femtosecond time-resolved spectroscopy. The fluorescence lifetime of the OPEs decreases with the number of phenyleneethynylene units up to about 9. This effect is due to an increase of the oscillator strength for the S₁–S₀ transition. Dynamic features occurring within a few tens of picoseconds and ascribed to structural relaxation directly after population of the S₁ state can be observed in non-viscous solvents. The effect of torsional disorder on the fluorescence intensity is shown to depend strongly on the nature of the substituent on the phenyl groups. All these effects are qualitatively discussed with a simple exciton model.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Chimie
- Language
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- English
- Classification
- Chemistry
- License
- License undefined
- Identifiers
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- RERO DOC 8404
- DOI 10.1039/b702647a
- Persistent URL
- https://folia.unifr.ch/unifr/documents/300474
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