Photochemical energy conversion in a helical oligoproline assembly.


A general method is described for constructing a helical oligoproline assembly having a spatially ordered array of functional sites protruding from a proline-II helix. Three different redox-active carboxylic acids were coupled to the side chain of cis-4-amino-L-proline. These redox modules were incorporated through solid-phase peptide synthesis into a 13-residue helical oligoproline assembly bearing in linear array a phenothiazine electron donor, a tris(bipyridine)ruthenium(II) chromophore, and an anthraquinone electron acceptor. Upon transient 460-nm irradiation in acetonitrile, this peptide triad formed with 53% efficiency an excited state containing a phenothiazine radical cation and an anthraquinone radical anion. This light-induced redox-separated state had a lifetime of 175 ns and stored 1.65 eV of energy.

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@article{McCafferty1996PhotochemicalEC, title={Photochemical energy conversion in a helical oligoproline assembly.}, author={Dewey G. McCafferty and Duane A Friesen and E Danielson and Craig Wall and Matthew J. Saderholm and Bruce W. Erickson and Thomas J. Meyer}, journal={Proceedings of the National Academy of Sciences of the United States of America}, year={1996}, volume={93 16}, pages={8200-4} }