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Title: Chlorine dioxide–iodine–acetylacetone oscillation reaction investigated by UV-vis spectrophotometry
Authors: Shi, Laishun
Li, Demei
Chen, Jingjing
Gao, Jian
Keywords: Oscillation reactions;Chemical oscillations;UV-vis spectrophotometry;Activation energy;Apparent activation energy;Chlorine dioxide;Acetylacetone
Issue Date: 8-Sep-2015
Publisher: NISCAIR-CSIR, India
Abstract: A new chlorine dioxide-iodine-acetylacetone chemical oscillatory reaction has been studied by UV-vis spectrophotometric method. The initial concentrations of acetylacetone, chlorine dioxide, iodine, sulfuric acid, and the pH value influence the oscillation observed at wavelength of 575 nm for the starch-triiodide complex. There is a pre-oscillatory or induction stage and the amplitude and the number of oscillations depend on the initial concentration of the reactants. Equations for the starch-triiodide complex reaction rate change with reaction time and the initial concentrations in the oscillation stage have been obtained. The induction time decreases linearly with the initial concentration of acetylacetone. The oscillation reaction can be accelerated by increasing the reaction temperature. The apparent activation energies at the induction stage and the oscillation stage are 24.94 kJ/mol and 7.38 kJ/mol, respectively. Generating the enol isomer by keto-enol tautomerism is an important step to constrain the time of induction period.
Page(s): 1109-1113
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.54A(09) [September 2015]

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