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Title: Intramolecular energy hopping in polyphenylene dendrimers with an increasing number of peryleneimide chromophores
Authors: Maus, MichaĆ«l ×
Mitra, S
Lor, Marc
Hofkens, Johan
Weil, T
Herrmann, A
Mullen, K
De Schryver, Frans #
Issue Date: Jan-2001
Publisher: Amer chemical soc
Series Title: Journal of Physical Chemistry A vol:105 issue:16 pages:3961-3966
Abstract: The photophysical properties and the excitation energy transfer (EET) process of a series of first generation dendrimers having a rigid tetrahedral core and different numbers of peryleneimide chromophores at the rim were investigated by steady-state and time-resolved fluorescence spectroscopy in toluene. It was shown that the model dendrimer containing only one chromophore decays monoexponentially with a time constant of 4.2 ns. In the multichromophoric compounds an additional long decay time of 7.4 ns assigned to an "excimer-like" state was observed, and its contribution increases with the number of chromophores. The time-resolved polarization measurements resulted in a nanosecond relaxation component due to the rotation of the entire dendritic structure. However, for the compounds having more than one chromophore, an additional fast anisotropy decay time of 100-200 ps was observed which corresponds to Forster type EET among the chromophores.
ISSN: 1089-5639
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
× corresponding author
# (joint) last author

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