标题：Chlorine dioxide-iodine-acetylacetone oscillation reaction investigated by UV-vis spectrophotometry
作者：Shi, Laishun; Li, Demei; Chen, Jingjing; Gao, Jian
作者机构：[Shi, Laishun; Li, Demei; Chen, Jingjing; Gao, Jian] Shandong Univ, Sch Chem & Chem Engn, Jinan 250061, Peoples R China.
通讯作者地址：[Shi, LS]Shandong Univ, Sch Chem & Chem Engn, South Campus, Jinan 250061, Peoples R China.
来源：INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL THEORETICAL & ANALYTICAL CHEMISTRY
关键词：Oscillation reactions; Chemical oscillations; UV-vis spectrophotometry;; Activation energy; Apparent activation energy; Chlorine dioxide;; Acetylacetone
摘要：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.