Mechanism and Kinetics of the Photocatalyzed Oxidation of p-Phenylenediamines by Peroxydisulfate in the Presence of Tri-2,2'-bipyridylylruthenium(II)

• Autor(a) principal: Nickel, Ulrich
• Data de Publicação: 1994
• Outros Autores: Chen, Yao-Hong, Schneider, Siegfried, Silva, Maria I., Burrows, Hugh D., Formosinho, Sebastião J.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/10490; https://doi.org/10.1021/j100062a026

The autocatalytic oxidation ofp-phenylenediamines with peroxydisulfate can be strongly enhanced by irradiation in the presence of tri-2,2’-bipyridylylruthenium(II). R~( b p y ) 3~a+ct s as photosensitizer and photocatalyst. First, 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 oxidizesp-phenylenediamine. The resulting R~( b p y ) 3~ca+n start the cycle again. The photocatalytic oxidation of N,N-diethyl-p-phenylenediaminea s well as the dark reactions were studied with stopped-flow techniques. The mechanism of this complex reaction is discussed in detail.