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Title: Electron transfer at the single-molecule level in a triphenylamine-perylene imide molecule
Authors: Bell, TDM ×
Stefan, Alina
Masuo, S
Vosch, Tom
Lor, M
Cotlet, M
Hofkens, Johan
Bernhardt, S
Mullen, K
Van der Auweraer, Mark
Verhoeven, JW
De Schryver, Frans #
Issue Date: May-2005
Publisher: Wiley-v c h verlag gmbh
Series Title: Chemphyschem vol:6 issue:5 pages:942-948
Abstract: Photoinduced electron transfer (ET) processes in a donor-acceptor system based on triphenylamine and perylene imide have been studied at the single-molecule (SM) and ensemble levels. The system exists as two isomers, one of which undergoes forward and reverse ET in toluene with decay constants of 3.0 and 2.2x10(9) s(-1), respectively, resulting in the dual emission of quenched and delayed fluorescence while the other isomer remains ET-inactive. The fluorescence of both isomers is heavily quenched in the more polar solvent, diethyl ether, by ET A broad range of ET dynamics is seen at the SM level in polystryene with the two isomers nonresolvable indicating that the local nanoenvironment of the SMs varies considerably throughout the polymer matrix. Both the electronic coupling and the driving force for ET are shown to influence the ET dynamics. Many fluorescence trajectories of SMs show long periods (tens of milliseconds to seconds) where the count rate is attenuated either portly (a "dim" state) or to the background level (an "off-time"). During these periods, the reduction or interruption of emission is attributed to cycles of rapid charge separation followed by charge recombination to the ground state reducing the fluorescence quantum yield of the SM.
URI: 
ISSN: 1439-4235
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
Chemistry - miscellaneous
× corresponding author
# (joint) last author

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