Photoinduced hole transfer from the triplet state in a porphyrin-based donor-bridge-acceptor system

Joakim Andréasson, Gerdenis Kodis, Thomas Ljungdahl, Ana L Moore, Thomas A Moore, John Devens Gust, Jerker Mårtensson, Bo Albinsson

Research output: Contribution to journalArticle

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Abstract

The triplet excited-state deactivation of a gold porphyrin (AuP) in porphyrin-based donor-bridge-acceptor (D-B-A) systems has been studied. The results from room temperature and 80 K measurements are presented. The primary objectives have been to investigate whether electrons/electron holes or excitation energy could be transferred from 3AuP to the appended zinc porphyrin (ZnP) in the dimers. As the bridging chromophores in our D-B-A systems separate the ZnP and AuP moieties by 19 Å edge-to-edge, we do not expect a significant contribution to either electron or energy transfer from a direct (through space) exchange mechanism. This gives us the opportunity to scrutinize how the bridging chromophores influence the transfer reactions. The results show that quenching of 3AuP occurs with high efficiency in the dimers that are connected by fully conjugated bridging chromophores, whereas no quenching is observed when the conjugation of the bridge is broken. We also observed that the decay of 3AuP is complex at temperatures below 110 K. In addition to the two previously published lifetimes on the order of some 10-100 μs, we have found a third lifetime on the nanosecond time scale.

Original languageEnglish
Pages (from-to)8825-8833
Number of pages9
JournalJournal of Physical Chemistry A
Volume107
Issue number42
DOIs
Publication statusPublished - Oct 23 2003

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Porphyrins
Chromophores
porphyrins
atomic energy levels
chromophores
Dimers
Electrons
Quenching
Excitation energy
zinc
quenching
dimers
Excited states
Gold
life (durability)
Energy transfer
conjugation
deactivation
excitation
Temperature

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Photoinduced hole transfer from the triplet state in a porphyrin-based donor-bridge-acceptor system. / Andréasson, Joakim; Kodis, Gerdenis; Ljungdahl, Thomas; Moore, Ana L; Moore, Thomas A; Gust, John Devens; Mårtensson, Jerker; Albinsson, Bo.

In: Journal of Physical Chemistry A, Vol. 107, No. 42, 23.10.2003, p. 8825-8833.

Research output: Contribution to journalArticle

Andréasson, Joakim ; Kodis, Gerdenis ; Ljungdahl, Thomas ; Moore, Ana L ; Moore, Thomas A ; Gust, John Devens ; Mårtensson, Jerker ; Albinsson, Bo. / Photoinduced hole transfer from the triplet state in a porphyrin-based donor-bridge-acceptor system. In: Journal of Physical Chemistry A. 2003 ; Vol. 107, No. 42. pp. 8825-8833.
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