Fluorescence Anisotropy of Branched Molecules Containing 1-Aminopyrene Chromophores

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 experime...

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Bibliographic Details
Published in:Journal of fluorescence 2011-05, Vol.21 (3), p.971-974
Main Authors: Dvořák, Miroslav, Michl, Martin, Almonasy, Numan, Nepraš, Miloš, Ladd, Nemiah, Fidler, Vlastimil
Format: Article
Language:English
Subjects:
Amines - chemistry
Analytical Chemistry
Anisotropy
Biochemistry
Biological and Medical Physics
Biomedical and Life Sciences
Biomedicine
Biophysics
Biotechnology
Chromophores
Electronics
Energy Transfer
Excitation
Fluorescence
Fluorescence Polarization
Mathematical analysis
Migration
Molecular Structure
Original Paper
Pyrenes - chemistry
Quantum chemistry
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Summary: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.
ISSN:1053-0509
1573-4994
DOI:10.1007/s10895-010-0668-3