MECHANISM AND KINETICS OF THE PHOTOCATALYZED OXIDATION OF P-PHENYLENEDIAMINES BY PEROXYDISULFATE IN THE PRESENCE OF TRI-2,2'-BIPYRIDYLYLRUTHENIUM(II)

Authors
NICKEL U CHEN YH SCHNEIDER S SILVA MI BURROWS HD FORMOSINHO SJ
Citation
U. Nickel et al., MECHANISM AND KINETICS OF THE PHOTOCATALYZED OXIDATION OF P-PHENYLENEDIAMINES BY PEROXYDISULFATE IN THE PRESENCE OF TRI-2,2'-BIPYRIDYLYLRUTHENIUM(II), Journal of physical chemistry, 98(11), 1994, pp. 2883-2888
Citations number
42
Categorie Soggetti
Chemistry Physical
Journal title
Journal of physical chemistry → ACNP
ISSN journal
00223654
Volume
98
Issue
11
Year of publication
1994
Pages
2883 - 2888
Database
ISI
SICI code
0022-3654(1994)98:11<2883:MAKOTP>2.0.ZU;2-E
Abstract
The autocatalytic oxidation of p-phenylenediamines with peroxydisulfat e can be strongly enhanced by irradiation in the presence of tri-2,2'- bipyridylylruthenium(II). Ru(bpy)3(2+) acts as photosensitizer and pho tocatalyst. First, Ru(bpy)33+ is formed by quenching excited Ru(bpy)3 (2+) with S2O8(2-). Then the ruthenium(III) complex oxidizes p-phenyle nediamine. The resulting Ru(bpy)3(2+) can start the cycle again. The p hotocatalytic oxidation of N,N-diethyl-p-phenylenediamine as well as t he dark reactions were studied with stopped-flow techniques. The mecha nism of this complex reaction is discussed in detail.