Photodriven transmembrane charge separation and electron transfer by a carotenoporphyrin-quinone triad

Patrick Seta, Elisabeth Bienvenue, Ana Moore, Paul Mathis, Rene V. Bensasson, Paul Liddell, Peter J. Pessiki, Anna Joy, Thomas Moore, Devens Gust

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Abstract

Photochemical transmembrane electron transfer processes are an integral part of natural photosynthetic solar energy conversion and are also central to the design of biomimetic energy conversion schemes1-6. Here we report the synthesis and membrane-associated photoelectrochemical properties of carotenoporphyrin-quinone triad (I), a compound containing a photochemically active porphyrin and electron donor and acceptor moieties, and with the molecular architecture necessary to span a phospholipid bilayer. On excitation of compound 1 by visible light, charge is separated across a planar phospholipid bilayer membrane (BLM) in an intramolecular step; in the presence of suitable electron donor and acceptor species in the aqueous phases, a steady-state photo-current is observed in an external circuit bridging the BLM. Artificial membranes containing I thus mimic key features of the photodriven transmembrane electron transfer processes characteristic of photosynthetic organisms.

Original languageEnglish (US)
Pages (from-to)653-655
Number of pages3
JournalNature
Volume316
Issue number6029
DOIs
StatePublished - Dec 1 1985

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Seta, P., Bienvenue, E., Moore, A., Mathis, P., Bensasson, R. V., Liddell, P., Pessiki, P. J., Joy, A., Moore, T., & Gust, D. (1985). Photodriven transmembrane charge separation and electron transfer by a carotenoporphyrin-quinone triad. Nature, 316(6029), 653-655. https://doi.org/10.1038/316653a0