An iridium-bipyridine complex as a photosensitizer for the bromide oxidation to bromine by oxygen

Anny Slama-Schwok, Shlomo Gershuni, Joseph Rabani, Haim Cohen, Dan Meyerstein

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Abstract

An iridium(III)-bipyridine complex, [Ir(C3,N′-bpy)(bpy)2]2+, was used as a photosensitizer in aqueous bromide solutions. Steady-state photolysis of oxygenated solutions by near-ultraviolet and visible light produces equal concentrations of Br3- and H2O2. The quantum yield of Br3- equivalents depends on pH, illumination dose, and bromide concentration. The initial yield (extrapolated) reaches a value of 0.08. A mechanism involving two exciplexes and the transients Br2-· and HO2 is proposed, based on products analysis, steady-state emission, and pulsed laser experiments.

Original languageEnglish
Pages (from-to)2460-2464
Number of pages5
JournalJournal of Physical Chemistry
Volume89
Issue number12
DOIs
StatePublished - 1 Jan 1985

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