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Charge-Transfer Interactions in a Multichromophoric Hexaarylbenzene Containing Pyrene and Triarylamines
journal contribution
posted on 2012-07-20, 00:00 authored by Christoph Lambert, Julia Ehbets, Dirk Rausch, Markus SteegerTwo different hexaarylbenzenes with three pyrene and
three triarylamine
substituents in different positions (trigonal symmetric and asymmetric
arrangement) were synthesized, and their charge-transfer states were
investigated by optical spectroscopy. In these multichromophoric systems
triarylamine acts as the electron donor and pyrene as the electron
acceptor. A reference chromophore with only one donor–acceptor
pair was also investigated. All these chromophores form charge-transfer
states upon photoexcitation which relax with a moderate fluorescence
quantum yield to the ground state. The compounds do not differ significantly
concerning most of their fluorescence properties, which shows that
the fluorescent charge-transfer state is very similar in all chromophores.
This observation indicates symmetry breaking for the symmetric chromophore
within fluorescence lifetime of several tens of ns. This interpretation
was substantiated by fluorescence excitation anisotropy measurements
in a sucrose octaacetate matrix.
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fluorescence excitation anisotropy measurementsreference chromophoresucrose octaacetate matrixfluorescence lifetimefluorescence propertieselectron donorelectron acceptorground statepyreneMultichromophoric Hexaarylbenzene Containing Pyrenetriarylamine substituentsfluorescence quantummultichromophoric systems triarylamine acts
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