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

Research output: Contribution to journalArticle

104 Citations (Scopus)

Abstract

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
Volume118
Issue number42
DOIs
Publication statusPublished - Oct 23 1996

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Photosynthetic Reaction Center Complex Proteins
Liquid Crystals
Liquid crystals
Electrons
Electron Spin Resonance Spectroscopy
Paramagnetic resonance
Spin dynamics
Photoexcitation
Toluene
Chromophores
Genetic Recombination
Spectrum Analysis
Spectroscopy
Ions
Proteins

ASJC Scopus subject areas

  • Chemistry(all)

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Radical pair and triplet state dynamics of a photosynthetic reaction-center model embedded in isotropic media and liquid crystals. / Hasharoni, Kobi; Levanon, Haim; Greenfield, Scott R.; Gosztola, David J.; Svec, Walter A.; Wasielewski, Michael R.

In: Journal of the American Chemical Society, Vol. 118, No. 42, 23.10.1996, p. 10228-10235.

Research output: Contribution to journalArticle

Hasharoni, Kobi ; Levanon, Haim ; Greenfield, Scott R. ; Gosztola, David J. ; Svec, Walter A. ; Wasielewski, Michael R. / Radical pair and triplet state dynamics of a photosynthetic reaction-center model embedded in isotropic media and liquid crystals. In: Journal of the American Chemical Society. 1996 ; Vol. 118, No. 42. pp. 10228-10235.
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AU - Svec, Walter A.

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