An additional negative feedback loop in the classical Belousov-Zhabotinsky reaction

Malonyl radical as a second control intermediate

Horst Dieter Försterling, Z. Noszticzius

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

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 ∼ 5 × 109 M-1 s-1), followed by Br2 and HOBr (k9 <1.5 × 108 M-1 s-1 and k8 <1 × 107 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.

Original languageEnglish
Pages (from-to)2740-2748
Number of pages9
JournalJournal of Physical Chemistry
Volume93
Issue number7
Publication statusPublished - 1989

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Electron spin resonance spectroscopy
negative feedback
Bromine
Bromides
Sulfuric acid
Reaction rates
Bromates
Feedback
Oxidation
Ions
bromides
Experiments
bromates
sulfuric acid
bromine
electron paramagnetic resonance
reaction kinetics
oxidation
spectroscopy
ions

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

An additional negative feedback loop in the classical Belousov-Zhabotinsky reaction : Malonyl radical as a second control intermediate. / Försterling, Horst Dieter; Noszticzius, Z.

In: Journal of Physical Chemistry, Vol. 93, No. 7, 1989, p. 2740-2748.

Research output: Contribution to journalArticle

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