What is it about?
10-cyano-9,9′-bianthryl is a molecule that undergoes ultrafast photoexcited intramolecular charge separation (CS) and femtosecond time-resolved transient absorption spectroscopy was applied to study the CS dynamics. It was found that the molecular oscillation in the initially photoexcited reactant state rapidly diminished with the CS while any oscillation was undetectable in the produced CS state. This result suggests that the CS reaction is not mediated by a specific intramolecular vibration in the CS state but occurs incoherently through higher levels of multiple vibrational modes.
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Why is it important?
Molecular vibration is expected to mediate charge transfer (CS) reaction especially in the Marcus inverted region. Hence, CS was studied for 10-cyano-9,9′-bianthryl (CBA) which exhibits ultrafast CS in the Marcus inverted region or near the top region of the bell-shaped Marcus energy gap dependence. The results suggest that the CS reaction is not mediated by a specific intramolecular vibration in the CS state but occurs incoherently through higher levels of multiple vibrational modes.
Perspectives
Rapid dephasing of the vibrational mode in the initially excited reactant state could suggest that the mode is coupled to the charge separation (CS) reaction.
Yutaka Nagasawa
Ritsumeikan University
Read the Original
This page is a summary of: Vibrational decoherence induced by ultrafast intramolecular charge separation of an asymmetric bianthryl derivative, The Journal of Chemical Physics, August 2020, American Institute of Physics,
DOI: 10.1063/5.0018482.
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