Photoinduced One-Electron Chloride Oxidation in Water Using a Pentacationic Ir(III) Photosensitizer
(2024) Journal of the American chemical society — Vol. 146, n° 16, p. 11031-11035 (2024)
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- Abstract
- A novel iridium(III) photosensitizer containing pyridinium-decorated terpyridines has been used for the photo-oxidation of chloride in water. Despite its abundance, the very positive one-electron reduction potential (E° Cl•/– = 2.1-2.4 V vs NHE) restricted its use in energy conversion schemes and artificial photosynthesis. The kinetics of the photo-induced electron trans-fer process were investigated through Stern-Volmer quenching experiments and nanosecond transient absorption spectrosco-py, which provided unambiguous evidence that photo-induced chloride oxidation occurred with a quenching rate constant kq = 5.0 x1010 M–1s–1. Complementary spectroelectrochemistry and photolysis experiments confirmed the formation of the re-duced photosensitizer and showcased the redox and photostability of the Ir(III) photosensitizer that holds great promise for the HX splitting approach.
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Citations
Wee-Léonard, M. V., Elias, B., & Troian-Gautier, L. (2024). Photoinduced One-Electron Chloride Oxidation in Water Using a Pentacationic Ir(III) Photosensitizer. Journal of the American chemical society, 146(16), 11031-11035. https://doi.org/10.1021/jacs.4c00478 (Original work published 2024)