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Photoproduction of Proton Gradients with pi-Stacked Fluorophore Scaffolds in Lipid Bilayers

Published inScience, vol. 313, no. 5783, p. 84-86
Publication date2006
Abstract

Rigid p-octiphenyl rods were used to create helical tetrameric {pi}-stacks of blue, red-fluorescent naphthalene diimides that can span lipid bilayer membranes. In lipid vesicles containing quinone as electron acceptors and surrounded by ethylenediaminetetraacetic acid as hole acceptors, transmembrane proton gradients arose through quinone reduction upon excitation with visible light. Quantitative ultrafast and relatively long-lived charge separation was confirmed as the origin of photosynthetic activity by femtosecond fluorescence and transient absorption spectroscopy. Supramolecular self-organization was essential in that photoactivity was lost upon rod shortening (from p-octiphenyl to biphenyl) and chromophore expansion (from naphthalene diimide to perylene diimide). Ligand intercalation transformed the photoactive scaffolds into ion channels.

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Citation (ISO format)
BHOSALE, Sheshanath et al. Photoproduction of Proton Gradients with pi-Stacked Fluorophore Scaffolds in Lipid Bilayers. In: Science, 2006, vol. 313, n° 5783, p. 84–86. doi: 10.1126/science.1127884
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ISSN of the journal0036-8075
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