Letter abstract
Nature Nanotechnology 3, 280 - 283 (2008)
Published online: 4 May 2008 | doi:10.1038/nnano.2008.97
Subject Categories: Molecular machines and motors | Photonic structures and devices
Self-regulation of photoinduced electron transfer by a molecular nonlinear transducer
Stephen D. Straight1, Gerdenis Kodis1, Yuichi Terazono1, Michael Hambourger1, Thomas A. Moore1, Ana L. Moore1 & Devens Gust1
Abstract
Organisms must adapt to survive, necessitating regulation of molecular and subcellular processes. Green plant photosynthesis responds to potentially damaging light levels by downregulating the fraction of excitation energy that drives electron transfer. Achieving adaptive, self-regulating behaviour in synthetic molecules is a critical challenge that must be met if the promises of nanotechnology are to be realized1. Here we report a molecular pentad consisting of two light-gathering antennas, a porphyrin electron donor, a fullerene electron acceptor and a photochromic control moiety. At low white-light levels, the molecule undergoes photoinduced electron transfer with a quantum yield of 82% . As the light intensity increases, photoisomerization of the photochrome leads to quenching of the porphyrin excited state, reducing the quantum yield to as low as 27% . This self-regulating molecule modifies its function according to the level of environmental light, mimicking the non-photochemical quenching mechanism2, 3, 4, 5, 6, 7, 8 for photoprotection found in plants.
- Department of Chemistry and Biochemistry, Center for Bioenergy and Photosynthesis, Arizona State University, Tempe, Arizona 85287, USA
Correspondence to: Devens Gust1 e-mail: gust@asu.edu
Correspondence to: Thomas A. Moore1 e-mail: tom.moore@asu.edu
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