Model systems for observing photoredox reactions of carotenoids

Ana L Moore, Thomas A Moore, J. J. Silber, L. Sereno, F. Fungo, L. Otero, G. Steinberg-Yfrach, P. A. Liddell, S. C. Hung, H. Imahori, S. Cardoso, D. Tatman, A. N. Macpherson

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Two approaches to eliciting photoelectrochemical reactions from carotenoids are being pursued. One uses LB films of amphipathic carotenoids deposited on semiconducting electrodes which are immersed in electrolytes containing electron donors or acceptors. Photocurrents are observed and their action spectra implicate the excited carotenoid pigment, possibly in an aggregated form, as the photoactive species. An example of the second approach is a molecular dyad consisting of a carotenoid covalently linked to C60. Excitation of the carotenoid moiety generates a charge-separated species in high yield. More complex systems include a molecular triad (C-P-Q) containing a porphyrin moiety (P) linked to a quinone (Q) and to a carotenoid (C). Triads of this type have been incorporated unidirectionally into lipid bilayer membranes. Time-resolved fluorescence experiments reveal that excitation of C-P-Q in the membrane leads to electron transfer from 1P to give C-P•+-Q•-. A subsequent electron transfer from C to P•+ yields C•+-P-Q•-. In this species the carotenoid pigment acts as a molecular wire to conduct charge across the membrane. In the presence of appropriate cofactors, this system translocates protons across the bilayer lipid membrane and generates proton motive force.

Original languageEnglish
Pages (from-to)2111-2116
Number of pages6
JournalPure and Applied Chemistry
Volume69
Issue number10
Publication statusPublished - Oct 1997

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Carotenoids
Lipid bilayers
Membrane Lipids
Membranes
Pigments
Electrons
Protons
Langmuir Blodgett films
Porphyrins
Photocurrents
Electrolytes
Large scale systems
Fluorescence
Wire
Electrodes
Experiments

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Moore, A. L., Moore, T. A., Silber, J. J., Sereno, L., Fungo, F., Otero, L., ... Macpherson, A. N. (1997). Model systems for observing photoredox reactions of carotenoids. Pure and Applied Chemistry, 69(10), 2111-2116.

Model systems for observing photoredox reactions of carotenoids. / Moore, Ana L; Moore, Thomas A; Silber, J. J.; Sereno, L.; Fungo, F.; Otero, L.; Steinberg-Yfrach, G.; Liddell, P. A.; Hung, S. C.; Imahori, H.; Cardoso, S.; Tatman, D.; Macpherson, A. N.

In: Pure and Applied Chemistry, Vol. 69, No. 10, 10.1997, p. 2111-2116.

Research output: Contribution to journalArticle

Moore, AL, Moore, TA, Silber, JJ, Sereno, L, Fungo, F, Otero, L, Steinberg-Yfrach, G, Liddell, PA, Hung, SC, Imahori, H, Cardoso, S, Tatman, D & Macpherson, AN 1997, 'Model systems for observing photoredox reactions of carotenoids', Pure and Applied Chemistry, vol. 69, no. 10, pp. 2111-2116.
Moore AL, Moore TA, Silber JJ, Sereno L, Fungo F, Otero L et al. Model systems for observing photoredox reactions of carotenoids. Pure and Applied Chemistry. 1997 Oct;69(10):2111-2116.
Moore, Ana L ; Moore, Thomas A ; Silber, J. J. ; Sereno, L. ; Fungo, F. ; Otero, L. ; Steinberg-Yfrach, G. ; Liddell, P. A. ; Hung, S. C. ; Imahori, H. ; Cardoso, S. ; Tatman, D. ; Macpherson, A. N. / Model systems for observing photoredox reactions of carotenoids. In: Pure and Applied Chemistry. 1997 ; Vol. 69, No. 10. pp. 2111-2116.
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