Improved Visible Light Absorption of Potent Iridium(III) Photo-oxidants for Excited-State Electron Transfer Chemistry
(2020) Journal of the American chemical society — Vol. 142, n° 6, p. 2732-2737 (2020)
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- Authors
Bevernaegie, Robin 
Wehlin, Sara A.M. Piechota, Eric J. Abraham, Michaël
- Abstract
- Three iridium photosensitizers, [Ir(dCF3ppy)2(N–N)]+, where N–N is 1,4,5,8-tetraazaphenanthrene (TAP), pyrazino[2,3-a]phenazine (pzph), or benzo[a]pyrazino[2,3-h]phenazine (bpph) and dCF3ppy is 2-(3,5-bis(trifluoromethyl-phenyl)pyridine), were found to be remarkably strong photo-oxidants with enhanced light absorption in the visible region. In particular, judicious ligand design provided access to Ir-bpph, with a molar absorption coefficient, ε = 9800 M–1 cm–1, at 450 nm and an excited-state reduction potential, E(Ir+*/0) = 1.76 V vs NHE. These complexes were successful in performing light-driven charge separation and energy storage, where all complexes photo-oxidized seven different electron donors with rate constants (0.089−3.06) × 1010 M–1 s–1. A Marcus analysis provided a total reorganization energy of 0.7 ± 0.1 eV for excited-state electron transfer.
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Citations
Bevernaegie, R., Wehlin, S. A. M., Piechota, E. J., Abraham, M., Philouze, C., Meyer, G. J., Elias, B., & Troian-Gautier, L. (2020). Improved Visible Light Absorption of Potent Iridium(III) Photo-oxidants for Excited-State Electron Transfer Chemistry. Journal of the American chemical society, 142(6), 2732-2737. https://doi.org/10.1021/jacs.9b12108 (Original work published 2020)