振動化学反応の研究--ルテニウム(2)-トリス-ジメチルジピリジン(Ru(dmbpy)32+)を触媒とするBelousov-Zhabotinskii反応の研究

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The behavior of Belousov-Zhabotinskii (B-Z) reaction catalyzed by Ru(dmbpy)32+ is studied. Both influences of reaction temperature and of reagents' concentration are traced by potentiometric method. The higher the concentration of malonic acid, the more stable the oscillation becomes, while at higher concentration of KBrO3, the oscillation becomes less stable with poor oscillation amplitude. During the whole reaction time, the oxidized form of catalyst, Ru(dmbpy)33+ is predominant in the solution. From the analysis of limit cycle for one oscillation at a given reaction stage, it is found that the oscillation is controlled predominantly with the reaction loop of bromide ion formation and consumption, reactiotl paths of (2, 3, 4), while the redox loop of catalyst, reaction paths of (2, 5), is found to be less active. The smaller value of k5, the rate constant for reduction of Ru(dmbpy)33+ by malonic acid, is attributable to these oscillation behaviors.