The autocatalytic oxidation ofp-phenylenediamines with peroxydisulfate can be strongly enhanced by irradiation the presence of tri-2,2’-bipyridylylruthenium(II). R~( b p y ) 3~a+ct s as photosensitizer and photocatalyst. , R~( b p y ) 3~is+ fo rmed by quenching excited R~*(bpy)3~w+it h S 2 0 ~ ~ T- .h en the ruthenium(II1) complex -phenylenediamine. The resulting R~( b p y ) 3~ca+n start the cycle again. The photocatalytic oxidation N,N-diethyl-p-phenylenediaminea s well as the dark reactions were studied with stopped-flow techniques. mechanism of this complex reaction is discussed in detail.
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Nickel et al. (1994) studied this question.