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Abstract
The autocatalytic oxidation of p-phenylenediamines with peroxydisulfate can be strongly enhanced by irradiation in the presence of tri-2,2'-bipyridylylruthenium(II). Ru(bpy) 3 2+ acts as photosensitizer and photocatalyst. First, Ru(bpy) 3 3+ is formed by quenching excited Ru * (bpy) 3 2+ with S 2 O 8 2+ . Then the ruthenium(III) complex oxidizes p-phenylenediamine. The resulting Ru(bpy) 3 2+ can start the cycle again. The photocatalytic oxidation of N,N-diethyl-p-phenylenediamine as well as the dark reactions were studied with stopped-flow techniques. The mechanism of this complex reaction is discussed in detail
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