Investigation of radical important in the Gyoergyi-Turanyi-Field model of the Belousov-Zhabotinskii reaction

Journal Article · Thu Sep 19 04:00:00 EDT 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100172a040· OSTI ID:5260432

Foersterling, H D ^[1]; Stuk, L ^[2]

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1. Philipps Univ. Marburg (West Germany)
2. Univ. of Texas, Austin (United States)

In the Gyoergyi-Turanyi-Field (GTF) model of the Belousov-Zhabotinskii (BZ) reaction, malonyl radicals (MA) and bromomalonyl radicals (BrMA) are assumed to be important intermediates. The hydrogen abstraction reactions MA{sm bullet} + BrMA {yields} MA + BrMa{sm bullet} (a) and BrMA{sm bullet} + MA {yields} BrMA + MA{sm bullet} (b) (MA, malonic acid; BrMA, bromomalonic acid) transfer the free-radical nature of the malonyl species to the bromomalonyl species and vice versa. The rates of these two reactions determine in part the relative importance of these radical intermediates. Another key radical reaction is BrMA + Ce{sup 4+} + H{sub 2}O {yields} BrTTA + Ce{sup 3+} (c) (BrTTA, bromotartronic acid), which is a source of Br{sup {minus}} through decomposition of BrTTa in the model. It has been deduced from ESR and spectrophotometric experiments that reactions a-c do not contribute to the chemistry of the BZ reaction. Numerical integration of the GTF rate equations, omitting reactions a-c, shows no oscillations in BZ systems with high initial concentrations of BrMA. Experimentally, these systems exhibit oscillations with no induction period.

• OSTI ID: 5260432
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:19; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ANIONS
CARBOXYLIC ACIDS
CATIONS
CERIUM IONS
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
DATA
DICARBOXYLIC ACIDS
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
INFORMATION
IONS
KINETICS
MAGNETIC RESONANCE
MALONIC ACID
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
RADIATIONS
RADICALS
REACTION INTERMEDIATES
REACTION KINETICS
RESONANCE
SPECTROSCOPY
VISIBLE RADIATION