Detecting electronic coherence in excited-state electron transfer in fluorinated benzenes.
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.
Kovalenko
S A
SA
Department of Chemistry, Humboldt University, Brook-Taylor Strasse 2, D-12489 Berlin, Germany. skovale@chemie.hu-berlin.de
Dobryakov
A L
AL
Farztdinov
V
V