Radical pair and triplet state dynamics of a photosynthetic reaction-center model embedded in isotropic media and liquid crystals

Kobi Hasharoni, Haim Levanon, Scott R. Greenfield, David J. Gosztola, Walter A. Svec, Michael R. Wasielewski

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107 Citations (Scopus)


The electron spin dynamics associated with intramolecular electron transfer in a photosynthetic model system, which consists of a linear structure of the type A-B-C, is described. In this structure. donor A is a p-methoxyaniline, chromophore B is a 4-amino- 1,8-naphthalimide, and acceptor C is a 1,4:5,8-naphthalenediimide. This supramolecular electron donor-acceptor array was isotropically oriented in toluene, and anisotropically oriented in liquid crystal matrices, and studied by time-resolved electron paramagnetic resonance spectroscopy. Photoexcitation of B results in a two-step electron transfer to yield the radical ion pair. A.+-B-C.-. Charge recombination within A.+-B-C.- produces a molecular triplet state, A-B-(3*)C, which exhibits the unique spin-polarized electron paramagnetic resonance signal that has been observed only in photosynthetic reaction-center proteins.

Original languageEnglish
Pages (from-to)10228-10235
Number of pages8
JournalJournal of the American Chemical Society
Issue number42
Publication statusPublished - Oct 23 1996


ASJC Scopus subject areas

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

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