| Abstract
| - In this study, coupled bromate-oscillators constructed by adding 1,4-cyclohexanedione (1,4-CHD) to the ferroin-catalyzed Belousov−Zhabotinsky reaction are investigated in a batch reactor under anaerobic conditions.Various complex behaviors such as sequential oscillations and bursting phenomena are observed. At lowconcentrations of ferroin or malonic acid (MA), the development of sequential oscillations is found to dependon the ratio of [1,4-CHD]/[ferroin] and [1,4-CHD]/[MA] rather than their absolute concentrations. As theconcentration of MA or ferroin was increased gradually, however, the minimum 1,4-CHD concentration requiredto induce complex oscillations reaches a plateau. Perturbations by light illustrate that the first oscillatorywindow is governed by the ferroin−MA−BZ mechanism, whereas the 1,4-CHD−bromate oscillator plays aprominent role during the non-oscillatory evolution and the second oscillatory window. Our conclusion isfurther supported by numerical simulations in which sequential oscillations observed in experiments arequalitatively reproduced by a modified FKN mechanism.
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