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Oxidation kinetics of p ‐aminodiphenylamine with peroxydisulphate
Author(s) -
ElSheikh M. Y.,
Salem M. A.,
Ismail A. A.,
Zaki A. B.
Publication year - 1993
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.610061103
Subject(s) - chemistry , kinetics , ammonium bromide , micelle , inorganic chemistry , cationic polymerization , bromide , ionic strength , ammonium , scavenger , photochemistry , pulmonary surfactant , radical , organic chemistry , aqueous solution , biochemistry , physics , quantum mechanics
The kinetics of oxidation of p ‐aminodiphenylamine with the peroxydisulphate ion were investigated spectrophotometrically. The oxidation was accompanied by the appearance of a wine‐red colour, which changed to become colourless. The reaction rate was measured by the stopped‐flow technique with a UV spectrophotometer. The reactions proceeded with second‐order kinetics, first‐order for each individual reactant. Cationic micelles (cetyltrimethyl ammonium bromide) caused an enhancement in the reaction rate followed by inhibition at higher concentrations. Anionic micelles (sodium dodecyl sulphate), on the other hand, had a slightly retarding effect. The effects of radical scavenger, pH and ionic strength on the fast oxidation rate were examined. A mechanism consistent with the observations is discussed.