Oscillating Chemical Reactions. 11. Behaviour of the "induction period" in the BrO~/Ce4+/Cyclohexanon and Br0~/Ce4+/Cyclopentanon systems
Summary1) The addition of a-monobromoketone, one of the products of reaction of the BrO~/Ce4+/Cyclohexanon (Sl) and BrO:/Ce4+/Cyclopentanon ( S 2 ) oscillating systems, decreases and even suppresses the induction period (rind) in the case of s 2 .Such is not the case with S1: t i n d , increases and the oscillations can even be completely inhibited.2) The order of addition of the reagents and the time lapse (tad,) preceding the addition of the last of them influences tind., particularly when the last reagent added is Ce4+.3) In our experimental conditions, the inhibition of the oscillatory phenomenon by C1-ions is definite only for IC1-I 35,O. ~O -* M (Sl) and IC1-I > 2 , 5 . 1 0 -3~ (S2); for lower concentrations rind, increases with 1 C1-1 .1. Introduction. -Nous avons montrt, dans une prtctdente publication [l], que des oscillations chimiques pouvaient &tre observkes avec des systkmes analogues a celui de Belousov-Zhabotinskii, mais dans lesquels I'acide malonique etait remplact par un compost cttonique simple (cyclohexanone, cyclopentanone, butanone ou pentanone-3).La pCriode ccprC-oscillatoire)) ou c(pCriode d'inductiom, (tind.), qui prtckde Yapparition des oscillations, est rune des caractkristiques principales des reactions chimiques oscillantes en milieu homogkne.Nous avons signalt [I] des effets difftrents de certains facteurs sur rind,; ainsi rind. avec la cyclohexanone est, toutes choses Cgales, beaucoup moins longue qu'avec la cyclopentanone. Cette difftrence est due a une rCactivitt plus tlevCe de la cyclohexanone tant vis-a-vis de la bromation (la quantitt d'tnol prtsente dans la cyclohexanone &ant de 3,3 . alors que pour la cyclopentanone elle
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