Thumbnail
Access Restriction
Open

Author Hasharoni, K. ♦ Levanon, H. ♦ Greenfield, S. R. ♦ Gosztola, D. J. ♦ Svec, W. A. ♦ Wasielewski, M. R.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CHEMISTRY ♦ PHYSICS ♦ PHOTOSYNTHETIC REACTION CENTERS ♦ ELECTRON TRANSFER ♦ ELECTRON SPIN RESONANCE ♦ ELECTRON SPECTRA ♦ ENERGY LEVELS ♦ RADICALS ♦ PROTEINS ♦ ION PAIRS ♦ LIQUID CRYSTALS ♦ DYNAMICS ♦ PHOTOSYNTHESIS
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{sup .+}-B-C{sup .-}. Charge recombination within A{sup .+}-B-C{sup .-} produces a molecular triplet state, A-B-{sup 3*}C, which exhibits the unique spin-polarized electron paramagnetic resonance signal that has been observed only in photosynthetic reaction-center proteins. 35 refs., 9 figs., 1 tab.
ISSN 00027863
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-10-23
Publisher Department Argonne National Laboratory (ANL), Argonne, IL
Publisher Place United States
Journal Journal of the American Chemical Society
Volume Number 118
Issue Number 42
Organization Argonne National Laboratory (ANL), Argonne, IL


Open content in new tab

   Open content in new tab