✦ LIBER ✦

Kinetics and mechanism of autocatalyzed reaction between Phenyl Hydrazine and Toluidine blue in aqueous solution

✍ Scribed by S. B. Jonnalagadda; K. Nattar

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 141 KB
Volume: 31
Category: Article
ISSN: 0538-8066
DOI: 10.1002/(sici)1097-4601(1999)31:2<83::aid-kin1>3.0.co;2-6

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✦ Synopsis

The kinetics and mechanism of reduction of aqueous toluidine blue by ϩ (TB ) phenyl hydrazine (Pz), which exhibits nonlinear behavior, is studied spectrophotometrically at Typical kinetic curves exhibited autocatalytic characteristics. The role of as an ϩ 630 nm. H autocatalyst is established. Rate constants for the uncatalyzed and acid catalyzed reactions are determined. The forward rate constants for the uncatalyzed and acid catalyzed reactions were and Reaction products are toluidine white, phenol, and Ϫ2 Ϫ1 Ϫ1 Ϫ1 Ϫ1 1.4 ϫ 10 M s 60 M s . an azo dye. From the stoichiometric ratios, the major reaction is ϩ Pz ϩ 2 TB ϩ H O ϭ 2 The rate expression and a detailed 12-step reaction mechanism ϩ PhOH ϩ 2 TBH ϩ 2 H ϩ N . 2 supported by simulations are proposed.

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