UV Light Generation and Challenging Photoreactions Enabled by Upconversion in Water

Pfund, Björn and Steffen, Debora M. and Schreier, Mirjam R. and Bertrams, Maria-Sophie and Ye, Chen and Börjesson, Karl and Wenger, Oliver S. and Kerzig, Christoph. (2020) UV Light Generation and Challenging Photoreactions Enabled by Upconversion in Water. Journal of the American Chemical Society, 142 (23). pp. 10468-10476.

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Official URL: https://edoc.unibas.ch/77764/

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Sensitized triplet-triplet annihilation (sTTA) is the most promising mechanism for pooling the energy of two visible photons, but its applications in solution were so far limited to organic solvents, with a current maximum of the excited-singlet state energy of 3.6 eV. By combining tailor-made iridium complexes with naphthalenes, we demonstrate blue-light driven upconversion in water with unprecedented singlet-state energies approaching 4 eV. The annihilators have outstanding excited-state reactivities enabling challenging photoreductions driven by sTTA. Specifically, we found that an aryl-bromide bond activation can be achieved with blue photons, and we obtained full conversion for the very energy-demanding decomposition of a persistent ammonium compound as typical water pollutant, not only with a cw laser but also with an LED light source. These results provide the first proof-of-concept for the usage of low-power light sources for challenging reactions employing blue-to-UV upconversion in water and pave the way for the further development of sustainable light-harvesting applications.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Wenger)
UniBasel Contributors:Wenger, Oliver and Pfund, Björn and Steffen, Debora and Schreier, Mirjam and Bertrams, Maria-Sophie and Kerzig, Christoph
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 Jun 2021 01:30
Deposited On:11 Aug 2020 12:45

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