Réactions chimiques oscillantes. II. Comportement de la «période d'induction» dans les systémes BrO/Ce4+/Cyclohexanone et BrO/Ce4+/Cyclopentanone |
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Authors: | Vincent J Farage DSimir Janjic |
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Institution: | Vincent J. Farage,DéSimir Janjic |
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Abstract: | Oscillating Chemical Reactions. 11. Behaviour of the “induction period” in the BrO /Ce4+/Cyclohexanon and BrO /Ce4+/Cyclopentanon systems - (1) The addition of α-monobromoketone, one of the products of reaction of the BrO3?/Ce4+/Cyclohexanon (S1) and BrO3?/Ce4+/Cyclopentanon (S2) oscillating systems, decreases and even suppresses the induction period (τind.) in the case of S2. Such is not the case with S1: τind. increases and the oscillations can even be completely inhibited.
- (2) The order of addition of the reagents and the time lapse (tadj.) preceding the addition of the last of them influences τind., particularly when the last reagent added is Ce4+.
- (3) In our experimental conditions, the inhibition of the oscillatory phenomenon by Cl? ions is definite only for | Cl? | ≥ 5,0 · 10?2M (S1) and |Cl?| > 2,5 · 10?3M (S2); for lower concentrations τind. increases with | Cl?|.
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