Fluorescence Anisotropy of Branched Molecules Containing 1-Aminopyrene Chromophores |
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Authors: | Miroslav Dvořák Martin Michl Numan Almonasy Miloš Nepraš Nemiah Ladd Vlastimil Fidler |
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Institution: | 1.Department of Physical Electronics, Faculty of Nuclear Sciences and Physical Engineering,Czech Technical University in Prague,Praha 8,Czech Republic;2.Institute of Organic Chemistry and Technology, Faculty of Chemical Technology,University of Pardubice,Pardubice,Czech Republic;3.Department of Natural Sciences, Faculty of Biomedical Engineering,Czech Technical University in Prague,Kladno 2,Czech Republic |
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Abstract: | Fluorescence anisotropy measurements were performed on a set of multichromophoric compounds, which contain a different number
of aminopyrenyl moieties linked to a triazine ring, in order to reveal the nature of both the electronic excited states and
relaxation pathways of the compounds. Our experimental results complement quantum chemical calculations. We propose that the
lowest excited state from which fluorescence proceeds is localized on a single individual aminopyrene moiety. In contrast,
excitation to a higher excited state is likely followed by a migration of energy to another nearby aminopyrene chromophore
before the internal conversion to the emitting state takes place. We suggest that this migration is responsible for the experimentally
measured decrease of fluorescence anisotropy of the studied compounds. |
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