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

Joakim Andréasson (Institutionen för fysikalisk kemi) ; Gerdenis Kodis ; Thomas Ljungdahl (Institutionen för kemi och biovetenskap, Organisk kemi) ; Ana Moore ; Tom Moore ; Devens Gust ; Jerker Mårtensson (Institutionen för kemi och biovetenskap, Organisk kemi) ; Bo Albinsson (Institutionen för fysikalisk kemi)
Journal of Physical Chemistry A (1089-5639). Vol. 107 (2003), 42, p. 8825-8833.
[Artikel, refereegranskad vetenskaplig]

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 (AuP)-Au-3 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 A 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 (AuP)-Au-3 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 (AuP)-Au-3 is complex at temperatures below 110 K. In addition to the two previously published lifetimes on the order of some 10-100 mus, we have found a third lifetime on the nanosecond time scale.

Denna post skapades 2007-01-30. Senast ändrad 2012-05-16.
CPL Pubid: 26067


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Institutioner (Chalmers)

Institutionen för fysikalisk kemi (1900-2003)
Institutionen för kemi och biovetenskap, Organisk kemi (1900-2004)



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