Control of the Chlorine Dioxide-Iodine-Malonic Acid Oscillating Reaction by Illumination

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• 作者：Alberto P. Mu&ntilde ; uzuri ; Milos Dolnik ; Anatol M. Zhabotinsky ; and Irving R. Epstein
• 刊名：Journal of the American Chemical Society
• 出版年：1999
• 出版时间：September 8, 1999
• 年：1999
• 卷：121
• 期：35
• 页码：8065 - 8069
• 全文大小：84K
• 年卷期：v.121,no.35(September 8, 1999)
• ISSN：1520-5126

文摘

We show that illumination of the chlorine dioxide-iodine-malonic acid reaction with visible lightsuppresses oscillations and shifts the steady state of the reaction to lower concentrations of iodide ions. In thesystem with starch, illumination results in a strong decrease of the steady-state concentration of the triiodide-starch complex. We suggest a simple mechanism, in which iodine atoms produced by photodissociation ofmolecular iodine initiate reduction of chlorine dioxide to chlorite and oxidation of iodide ions to iodine. Thisresults in a decreased amplitude of oscillations and, at more intense illumination, the cessation of oscillations.Illumination also lowers the steady-state concentrations of iodide and the triiodide-starch complex. Resultsobtained from numerical simulations are in good agreement with the experimental data.