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Title: Sodium chlorite-iodine-methyl acetoacetate oscillatory reaction investigated by UV-vis spectrophotometry
Authors: Shi, Laishun
Li, Na
Liu, Jie
Qian, Yanan
Yang, Bing
Lin, Sha
Keywords: Oscillatory reactions;UV-vis spectrophotometry;Apparent activation energy;Sodium chlorite;Methyl acetoacetate
Issue Date: 6-Feb-2013
Abstract: A new sodium chlorite-iodine-methyl acetoacetate chemical oscillatory reaction has been studied UV-vis spectrophotometrically. The initial concentrations of methyl acetoacetate, sodium chlorite, iodine and sulfuric acid, and, the pH of the system influence the oscillation observed at wavelength of 297 nm. There is a pre-oscillatory or induction period and the amplitude and the number of oscillations depend on the initial concentration of the reactants. The induction time decreases linearly with the initial concentration of methyl acetoacetate. The oscillatory reaction can be accelerated by increasing the temperature. The induction and the oscillation periods have two different apparent activation energies, i.e., 52.83 kJ/mol and 29.12 kJ/mol, respectively, indicating that the two stages have different reaction mechanisms. Generating the enol isomer by keto-enol tautomerism is an important step to constrain the time of induction period.
Page(s): 226-231
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.52A(02) [February 2013]

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