Energy and photoinduced electron transfer in a wheel-shaped artificial photosynthetic antenna-reaction center complex

Gerdenis Kodis, Yuichi Terazono, Paul A. Liddell, Joakim Andréasson, Vikas Garg, Michael Hambourger, Thomas Moore, Ana Moore, Devens Gust

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Abstract

Functional mimics of a photosynthetic antenna-reaction center complex comprising five bis-(phenylethynyl)anthracene antenna moieties and a porphyrin-fullerene dyad organized by a central hexaphenylbenzene core have been prepared and studied spectroscopically. The molecules successfully integrate singlet-singlet energy transfer and photoinduced electron transfer. Energy transfer from the five antennas to the porphyrin occurs on the picosecond time scale with a quantum yield of 1.0. Comparisons with model compounds and theory suggest that the Förster mechanism plays a major role in the extremely rapid energy transfer, which occurs at rates comparable to those seen in some photosynthetic antenna systems. A through-bond, electron exchange mechanism also contributes. The porphyrin first excited singlet state donates an electron to the attached fullerene to yield a P.+-C60.- charge-separated state, which has a lifetime of several nanoseconds. The quantum yield of charge separation based on light absorbed by the antenna chromophores is 80% for the free base molecule and 96% for the zinc analogue.

Original languageEnglish (US)
Pages (from-to)1818-1827
Number of pages10
JournalJournal of the American Chemical Society
Volume128
Issue number6
DOIs
StatePublished - Feb 15 2006

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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