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Bull, James N. 
ORCID: https://orcid.org/0000-0003-0953-1716, Scholz, Michael S., Carrascosa, Eduardo, Da Silva, Gabriel and Bieske, Evan J.
(2018)
Double molecular photoswitch driven by light and collisions.
Physical Review Letters, 120 (22).
ISSN 0031-9007
Abstract
The shapes of many molecules can be transformed by light or heat. Here we investigate collision- and photon-induced interconversions of EE, EZ, and ZZ isomers of the isolated Congo red (CR) dianion, a double molecular switch containing two NN azo groups, each of which can have the E or Z configuration. We find that collisional activation of CR dianions drives a one-way ZZ→EZ→EE cascade towards the lowest-energy isomer, whereas the absorption of a single photon over the 270-600 nm range can switch either azo group from E to Z or Z to E, driving the CR dianion to lower- or higher-energy forms. The experimental results, which are interpreted with the aid of calculated statistical isomerization rates, indicate that photoisomerization of CR in the gas phase involves a passage through conical intersection seams linking the excited and ground state potential energy surfaces rather than through isomerization on the ground state potential energy surface following internal conversion.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | physics and astronomy(all) ,/dk/atira/pure/subjectarea/asjc/3100 |
| Faculty \ School: | Faculty of Science > School of Chemistry |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 28 Feb 2019 16:30 |
| Last Modified: | 09 Feb 2023 13:46 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/70057 |
| DOI: | 10.1103/PhysRevLett.120.223002 |
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