Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 29, Pages 9013-9017Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201804498
Keywords
artificial photosynthesis; photophysics; porphyrin; proton-coupled electron transfer; Tyr(Z)-His(190) model
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Funding
- COST PERSPECT-H2O
- Erasmus Mundus
- French Infrastructure for Integrated Structural Biology [ANR-10-INSB-05-01]
- Conseil General d'Essonne (ASTRE)
- Labex CHARMMMAT
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We investigate a biomimetic model of a Tyr(Z)/His(190) pair, a hydrogen-bonded phenol/imidazole covalently attached to a porphyrin sensitizer. Laser flash photolysis in the presence of an external electron acceptor reveals the need for water molecules to unlock the light-induced oxidation of the phenol through an intramolecular pathway. Kinetics monitoring encompasses two fast phases with distinct spectral properties. The first phase is related to a one-electron transfer from the phenol to the porphyrin radical cation coupled with a domino two-proton transfer leading to the ejection of a proton from the imidazole-phenol pair. The second phase concerns conveying the released proton to the porphyrin N-4 coordinating cavity. Our study provides an unprecedented example of a light-induced electron-transfer process in a Tyr(Z)/His(190) model of photosystemII, evidencing the movement of both the phenol and imidazole protons along an isoenergetic pathway.
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