UNIGE document Scientific Article
previous document  unige:73258  next document
add to browser collection
Title

Electron, Hole, Singlet, and Triplet Energy Transfer in Photoexcited Porphyrin-Naphthalenediimide Dyads

Authors
Hangarge, Rahul V.
Boshale, Sheshanath V.
Published in Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical. 2015, vol. 119, no. 24, p. 7308-7320
Abstract The excited-state dynamics of two molecular dyads, consisting of zinc (1) and free-base (2) porphyrin connected via a peptide linker to a core-substituted naphthalenediimide (NDI) have been investigated using optical spectroscopy. These dyads exhibit rich photophysics because of the large number of electronic excited states below 3 eV. In the case of 1 in apolar solvents, excitation energy transfer from the vibrationally hot singlet excited porphyrin to the NDI takes place with a 500 fs time constant. Electronic energy ends up in the NDI-localized triplet state, which decays to the ground state on a microsecond timescale. In polar solvents, ground-state recovery is faster by 5 orders of magnitude because of the occurrence of charge separation followed by recombination. On the other hand, excitation energy transfer in 2 takes place in the opposite direction, namely from the NDI to the porphyrin, which then undergoes intersystem crossing to the triplet state, followed by triplet energy transfer back to the NDI. Therefore, four distinct local electronic excited states are consecutively populated after excitation of the NDI unit of 2, with the energy shuttling between the two ends of the dyad.
Identifiers
Full text
Article (Published version) (593 Kb) - document accessible for UNIGE members only Limited access to UNIGE
Other version: http://pubs.acs.org/doi/abs/10.1021/jp5108685
Structures
Research group Groupe Vauthey
Citation
(ISO format)
YUSHCHENKO, Oleksandr et al. Electron, Hole, Singlet, and Triplet Energy Transfer in Photoexcited Porphyrin-Naphthalenediimide Dyads. In: Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical, 2015, vol. 119, n° 24, p. 7308-7320. https://archive-ouverte.unige.ch/unige:73258

263 hits

0 download

Update

Deposited on : 2015-06-19

Export document
Format :
Citation style :