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Photo-oxidation of water in a system consisting of perfluorinated p-terphenyl (F-OPP-3) as a photosensitizer, O2 as an oxidative quencher and benzene as a hydroxyl radical scavenger is mechanistically studied by laser flash photolysis and γ-ray and pulse radiolysis. The radical cation of F-OPP-3 (F-OPP-3˙+) is formed via the oxidative quenching of its excited singlet state by O2. The decay of F-OPP-3˙+ observed in transient spectroscopy is enhanced by the addition of water to the system, indicating that F-OPP-3˙+ plays a crucial role in the one-electron oxidation of water.


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