Long-lived oscillations in the chlorite-iodide-malonic acid reaction in batch

Journal Article · Wed May 20 04:00:00 EDT 1992 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja00037a037· OSTI ID:237270

Noszticzius, Z; Ouyang, Qi; McCormick, W D; Swinney, H L ^[1]

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1. Univ. of Texas, Austin, TX (United States)

The title reaction is the subject of current interest because the first experimental Turing patterns were observed recently in this system. Here, the authors report the first observation of oscillations that are long lived (over 1 h) in this system in a batch reactor; even after cessation the oscillations can be restarted several times by adding ClO{sub 2} to the exhausted system. These low-frequency low-amplitude (LL) oscillations were detected with both platinum and iodide-selective electrodes in the chlorite-iodide-malonic acid (original CIMA) reaction and in the closely related chlorine dioxide-iodide-malonic acid (minimal CIMA) system. The LL oscillations follow after the already known high frequency oscillations, sometimes separated by a second induction period. LL oscillations can appear without any induction period if appropriate concentrations of chlorine dioxide, iodomalonic acid, and chloride (CIMA-Cl system) are established in a dilute sulfuric acid medium. In this case neither iodine, iodide, nor malonic acid is needed. Some suggestions are made regarding the mechanism of these newly discovered oscillations. 33 refs., 6 figs., 1 tab.

• OSTI ID: 237270
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 11 Vol. 114; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
CHLORINE OXIDES
EQUILIBRIUM
IODIDES
MALONIC ACID
OSCILLATIONS