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Kinetics of oxidation of toluidine blue by periodate: Catalysis by water pools of CTAB

Kinetic study of oxidation of toluidine blue (TB+) by periodate was carried out in aqueous medium and also in the cetyl trimethyl ammonium bromide (CTAB) reverse micellar medium. In both the media reaction obeys first order kinetics with respect to each of the reactants. | Kinetics of oxidation of toluidine blue by periodate Catalysis by water pools of CTAB Current Chemistry Letters 7 2018 93 100 Contents lists available at GrowingScience Current Chemistry Letters homepage www.GrowingScience.com Kinetics of oxidation of toluidine blue by periodate Catalysis by water pools of CTAB K.V. Nagalakshmia P. Shyamalab and P.V. Subba Raoc a Department of Chemistry G.V.P.College of Engineering Autonomous Madhurawada Visakhapatnam-530048 India b Department of Physical chemistry Andhra University Visakhapatnam-530017 India c Retired Professor Department of Physical chemistry Andhra University Visakhapatnam-530017 India CHRONICLE ABSTRACT Article history Kinetic study of oxidation of toluidine blue TB by periodate was carried out in aqueous Received June 28 2018 medium and also in the cetyl trimethyl ammonium bromide CTAB reverse micellar medium. Received in revised form In both the media reaction obeys first order kinetics with respect to each of the reactants. In the July 20 2018 reverse micellar medium the reaction is forty times faster compared to aqueous medium under Accepted August 20 2018 identical experimental conditions. The pronounced acceleration is accounted for by the lower Available online micro polarity and the concentration effect present in the bound water of reverse micelles. In August 20 2018 CTAB reverse micellar medium the pseudo first order rate constant k of the reaction is Keywords almost constant at all values of W W H2O CTAB indicating that the reaction takes place Kinetics Oxidation on the micellar surface and results were explained by modified Berezin pseudo phase model. Toluidine blue Periodate Water pools 2018 Growing Science Ltd. All rights reserved. 1. Introduction The solubilised water present in the polar cavity of reverse micelles is called water pool which has unique properties like lower dielectric constant i.e. micropolarity higher viscosity lower thermodynamic activity of water higher ionic strength in the