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Published on: July 27, 2018
Detecting electronic coherence in excited-state electron transfer in fluorinated benzenes
S A Kovalenko1, A L Dobryakov, V Farztdinov
1Department of Chemistry, Humboldt University, Brook-Taylor Strasse 2, D-12489 Berlin, Germany. skovale@chemie.hu-berlin.de
Abstract:
Photoinduced electron transfer (ET) in heavily fluorinated benzenes in solution has been studied with broadband transient absorption spectroscopy. Spectrally resolved kinetics exhibit oscillations with amplitude up to 70% of the signal. The oscillation frequency is specific for each probe; in addition, for pentafluorobenzene it markedly depends on solvent, being 86 cm(-1) in hexane and 94 cm(-1) in acetonitrile. We argue that the observed behavior is not related to vibrational coherences, but originate from coherent electronic motion between an optically excited and an ET state.
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