Mapping the Excited‐State Potential Energy Surface of a Photomolecular Motor
Hall, Christopher R, Browne, Wesley R., Feringa, Ben L. and Meech, Stephen R. (2018) Mapping the Excited‐State Potential Energy Surface of a Photomolecular Motor. Angewandte Chemie International Edition, 57 (21). pp. 6203-6207. ISSN 1433-7851
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Abstract
A detailed understanding of the operation and efficiency of unidirectional photomolecular rotary motors is essential for their effective exploitation in molecular nanomachines. Unidirectional motion relies on light‐driven conversion from a stable (1 a) to a metastable (1 b) conformation, which then relaxes through a thermally driven helix inversion in the ground state. The excited‐state surface has thus far only been experimentally characterised for 1 a. Here we probe the metastable, 1 b, excited state, utilising ultrafast transient absorption and femtosecond stimulated Raman spectroscopy. These reveal that the “dark” excited‐state intermediate between 1 a and 1 b has a different lifetime and structure depending on the initial ground‐state conformation excited. This suggests that the reaction coordinate connecting 1 a to 1 b differs to that for the reverse photochemical process. The result is contrasted with earlier calculations.
Item Type: | Article |
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Uncontrolled Keywords: | energy conversion,excited states,molecular motors,photochemistry,ultrafast dynamics |
Faculty \ School: | Faculty of Science > School of Chemistry |
Depositing User: | Pure Connector |
Date Deposited: | 10 Apr 2018 15:30 |
Last Modified: | 12 Jan 2021 00:49 |
URI: | https://ueaeprints.uea.ac.uk/id/eprint/66735 |
DOI: | 10.1002/anie.201802126 |
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