Kinetics and mechanistic aspects on electron‐transfer process for permanganate oxidation of poly(ethylene glycol) in aqueous acidic solutions in the presence and absence of Ru(III) catalyst

Abstract

The kinetics and mechanism of oxidation of poly(ethylene glycol) (PEG) by the permanganate ion as a multiequivalent oxidant in aqueous perchlorate solutions at an ionic strength of 2.0 mol dm−3 has been investigated spectrophotometrically. The reaction kinetics was found to be of complex in nature. The pseudo–first‐order plots showed curves of inverted S‐shape, consisting of two distinct stages throughout the entire course of reaction. The first stage was relatively slow, followed by a fast reaction rate at longer time periods. The first‐order dependence in [MnO4−], fractional first‐order dependence in [H+], and fractional first‐order kinetics in the PEG concentration for the first stage have been revealed in the absence of the Ru(III) catalyst. The influence of the Ru(III) catalyst on the oxidation kinetics has been examined. The oxidation was found to be catalyzed by the added Ru(III) catalyst. The First‐order dependence on the catalyst and zero order with respect to the oxidant concentrations have been observed. The kinetic parameters have been evaluated, and a tentative reaction mechanism consistent with the kinetic results is suggested and discussed.

Oxidation process and kinetics of bromothymol blue by alkaline permanganate

“…By adding the requisite amount of reagent powder to doubly distilled water, a stock solution of BTB was formed 32, 33 . A stock solution of KMnO 4 (BDH) as described elsewhere was prepared, stored, and standardized 34–36 . All other reagents were of analytical grade, and their solutions were prepared by dissolving in doubly distilled water 37–39 .…”

Combined Experimental and TDDFT-DFT Computation, Characterization, and Optical Properties for Synthesis of Keto-Bromothymol Blue Dye Thin Film as Optoelectronic Devices

“…8,9 In the determination of the substance of the pharmaceutical formulation, the [MnO − 1 4 ] ion is often used as a purifying agent to purify water from polluted organic molecules. 10 However, much attention has been paid to the kinetics of alcoholic polysaccharides and BTB reducing permanganate ion in acidic [11][12][13] and alkaline solutions. 14,15 The oxidization of BTB in alkaline media has led to the research to explain the influence and substrate of the medium on the behavior of the kinetics and the mechanism of oxidation.…”

Novel Synthesis of Keto acid Precursor Derivative for Oxidation of Lambda-Carrageenan Polysaccharide by Alkaline Permanganate

“…Permanganate ion is a strong oxidizing agent of multiequivalent nature that is utilized to oxidase most organic [8,9] and inorganic [10][11][12] substrates. In addition, Hassan et al evaluated the oxidation kinetics of some alcoholic macromolecules of either natural polymers such as polysaccharides [13][14][15] or synthetic ones as poly (vinyl alcohol) [16] and poly (ethylene glycol) [17] by permanganate ion in alkaline media at pH's > 12. They presented data on the secondary alcoholic groups' oxidation in case of non-sulfated polysaccharides results in corresponding keto-derivatives formation [18][19][20][21][22].…”