Journal of Physical Chemistry p. 2883 - 2888 (1994)
Update date:2022-08-11
Topics:
Nickel, Ulrich
Chen, Yao-Hong
Schneider, Siegfried
Silva, Maria I.
Burrows, Hugh D.
Formosinho, Sebastiao J.
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)32+ acts as photosensitizer and photocatalyst.First, Ru(bpy)33+ is formed by quenching excited Ru*(bpy)32+ with S2O82-.Then the ruthenium(III) complex oxidizes p-phenylenediamine.The resulting Ru(bpy)32+ 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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