Photoproduction of Proton Gradients with π-Stacked Fluorophore Scaffolds in Lipid Bilayers
| Autor: | Natalie Banerji, Eric Vauthey, Guillaume Bollot, Naomi Sakai, Stefan Matile, Frank Würthner, Pinaki Talukdar, Sheshanath V. Bhosale, Adam L. Sisson, Cornelia Röger, Jiri Mareda, Alexandre Fürstenberg |
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| Rok vydání: | 2006 |
| Předmět: |
Fluorophore
Light Photochemistry Lipid Bilayers Analytical chemistry Electrons Naphthalenes Imides Ligands chemistry.chemical_compound Diimide Synthetic ion channels Benzene Derivatives Benzoquinones Lipid bilayer Edetic Acid Multidisciplinary Molecular Structure Chemistry Bilayer Temperature Chromophore Quinone Thermodynamics Protons Oxidation-Reduction Perylene Phenanthrolines |
| Zdroj: | Science. 313:84-86 |
| ISSN: | 1095-9203 0036-8075 |
| Popis: | Rigid p -octiphenyl rods were used to create helical tetrameric π-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. |
| Databáze: | OpenAIRE |
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