Journal
NATURE CHEMISTRY
Volume 6, Issue 3, Pages 202-207Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEM.1858
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Funding
- Swiss National Science Foundation
- University of Geneva
- Austrian Science Fund [J3343]
- Austrian Science Fund (FWF) [J 3343] Funding Source: researchfish
- Austrian Science Fund (FWF) [J3343] Funding Source: Austrian Science Fund (FWF)
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Biological light-driven proton pumps use light to move protons across a cell membrane, creating a proton gradient. Although photochromic compounds such as spiropyrans can reversibly convert between two structures with differing pK(a) values, spiropyrans have not been used to generate either a light-driven proton pump or an electrical current. Here, we report an artificial light-harvesting system based on a supported liquid membrane doped with a spiropyran. Irradiating the membrane with ultraviolet light induces a ring-opening reaction, converting spiropyran to merocyanine, whereas irradiation with visible light induces the reverse reaction. When the membrane is irradiated with ultraviolet and visible light on opposite sides, H+ is taken up by merocyanine, carried through the polymeric membrane and released on the other side. We show that this system produces a light-induced proton flux, an electrical current with an efficiency of similar to 0.12%, an open-circuit voltage of similar to 210 mV and a membrane gradient of similar to 3.6 Delta pH units. Alternating the sides illuminated with ultraviolet and visible light generates an alternating current.
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