Both heterogeneous and homogeneous catalyses of water oxidation to 02 have been recently reported for metal oxides1 and aquo-or hydroxo-metal complexes.2 One of the more efficient systems involves cobalt(II) catalysis of water oxidation by Ru-(bpy)33+ (£°(Ru(bpy)33+/2+) = 1.26 V), which occurs above pH ~52a (eq 1). We have studied the kinetics and product distri-Ru(bpy)33+ + V2H20 = Ru(bpy)32+ + H++ >/402 (1)
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