Charge-Transfer Interactions
in a Multichromophoric
Hexaarylbenzene Containing Pyrene and Triarylamines
Christoph Lambert
Julia Ehbets
Dirk Rausch
Markus Steeger
10.1021/jo300924x.s001
https://acs.figshare.com/articles/journal_contribution/Charge_Transfer_Interactions_in_a_Multichromophoric_Hexaarylbenzene_Containing_Pyrene_and_Triarylamines/2503363
Two 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.
2012-07-20 00:00:00
fluorescence excitation anisotropy measurements
reference chromophore
sucrose octaacetate matrix
fluorescence lifetime
fluorescence properties
electron donor
electron acceptor
ground state
pyrene
Multichromophoric Hexaarylbenzene Containing Pyrene
triarylamine substituents
fluorescence quantum
multichromophoric systems triarylamine acts