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Quantum coherence enhances electron transfer rates to two equivalent electron acceptors

Phelan, Brian T., Zhang, Jinyuan, Huang, Guan-Jhih, Wu, Yi-Lin, Zarea, Mehdi, Young, Ryan M. and Wasielewski, Michael R. 2019. Quantum coherence enhances electron transfer rates to two equivalent electron acceptors. Journal of the American Chemical Society 141 (31) , pp. 12236-12239. 10.1021/jacs.9b06166

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Abstract

When a molecular electron donor interacts with multiple electron acceptors, quantum coherence can enhance the electron transfer (ET) rate. Here we report photodriven ET rates in a pair of donor–acceptor (D-A) compounds that link one anthracene (An) donor to one or two equivalent 1,4-benzoquinone (BQ) acceptors. Subpicosecond ET from the lowest excited singlet state of An to two BQs is about 2.4 times faster than ET to one BQ at room temperature, but about 5 times faster at cryogenic temperatures. This factor of 2 increase results from a transition from ET to one of two acceptors at room temperature to ET to a superposition state of the two acceptors with correlated system–bath fluctuations at low temperature.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: American Chemical Society
ISSN: 0002-7863
Date of First Compliant Deposit: 30 July 2019
Date of Acceptance: 14 July 2019
Last Modified: 24 Sep 2020 17:00
URI: http://orca-mwe.cf.ac.uk/id/eprint/124591

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