Excited-state electron-transfer quenching by a series of water photoreduction mediators |
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Authors: | Edmond Amouyal Bertrand Zidler Patrick Keller Alec Moradpour |
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Affiliation: | Processus Photophysiques et Photochimiques (ERA 718), UniversitéParis-Sud, 91405 Orsay, France;Laboratoire de Synthèse Asymétrique (LA 255) and Laboratoire de Physique des Solides (LA 2), Université Paris-Sud, 91405 Orsay, France |
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Abstract: | Rate constants kq for the quenching of the excited state of Ru(bipy)32+ by a series of viologen salts having different redox potential E have been determined in deaerated aqueous solutions at pH = 5 by laser flash photolysis. The kq values are found to decrease with increasing —E and to correlate with the reaction free-energy change ΔG. Such a correlation is shown to be consistent with the Rehm—Weller model for electron-transfer reactions. |
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