Journal of Physical Chemistry p. 2740 - 2748 (1989)
Update date:2022-08-17
Topics:
Foersterling, Horst-Dieter
Noszticzius, Zoltan
Reactions of malonyl radicals with inorganic bromine species (oxidation numbers -1 to +5) of the Belousov-Zhabotinsky (BZ) reaction are investigated in 1 M sulfuric acid medium by electron spin resonance spectroscopy in continuous-flow experiments.A very high reaction rate is found for BrO2. (k7 ca. 5*1E9 M-1 s-1), followed by Br2 and HOBr (k9 < 1.5*1E8 M-1 s-1 and k8 < 1*1E7 M-1 s-1, respectively).At high concentrations acidic bromate and bromide have some effect too, but this is probably due to indirect reactions.The results indicate that malonyl radical plays an important role as a second control intermediate besides bromide ion in the oscillatory mechanism of the BZ reaction.
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