Electron spin resonance kinetic studies of malonyl radical self-decay and oxidation reactions by cerium(IV) and bromate in acid aqueous media. The role of free radicals in the Belousov-Zhabotinskii oscillator

Journal Article · Thu Apr 25 04:00:00 EST 1985 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100255a006· OSTI ID:5262822

Brusa, M A; Perissinotti, L J; Colussi, A J

Kinetics of selected reactions involving malonyl radicals (M), generated by Ce(IV) oxidation of malonic acid in acid aqueous media, have been studied by steady-state electron spin resonance under stopped-flow conditions. Rate constants for second-order radial self-decay, k/sub 2/(M + M) = 3.2 x 10/sup 9/, oxidation by bromate, k/sub 4/(M + BrO/sub 3//sup -/) = 6.7 x 10/sup 3/, and an upper limit for its oxidation by Ce(IV), k/sub 3/(M + Ce(Iv)) less than or equal to 1.2 x 10/sup 5/M/sup -1/s/sup -1/, have been obtained at 298 K. Some of the consequences of the present results on the mechanism of the Belousov-Zhabotinskii oscillator are examined. 16 references, 4 figures.

• Research Organization: Univ. of Mar del Plata, Argentina
• OSTI ID: 5262822
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 89:9; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ABSORPTION SPECTROSCOPY
BROMATES
BROMINE COMPOUNDS
CARBOXYLIC ACIDS
CERIUM
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
DATA
DICARBOXYLIC ACIDS
ELECTRON SPIN RESONANCE
ELEMENTS
EPR SPECTROMETERS
EXPERIMENTAL DATA
HALOGEN COMPOUNDS
INFORMATION
KINETICS
MAGNETIC RESONANCE
MALONIC ACID
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
METALS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
RADICALS
RARE EARTHS
REACTION KINETICS
RESONANCE
SPECTROMETERS
SPECTROSCOPY
SYNTHESIS