Kinetic study of some reactions related to the Mn(II)‐catalyzed bromate‐saccharide oscillating reactions

Ou, Chin-Chou; Jwo, Jing‐Jer

doi:10.1002/kin.550230205

Cited by 15 publications

(7 citation statements)

References 22 publications

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“…Thus both HBrO 2 and BrO 2 • are autocatalytic intermediates and any species reacting with them can inhibit the whole autocatalytic process. The usual control mechanism in B-Z reactions essentially involves step (25), which is inhibited by Br -according to step (2). This is called the Brcontrol mechanism.…”

Section: Discussionmentioning

confidence: 99%

Dual Control Mechanism in a Belousov−Zhabotinskii (B−Z) Oscillator with Glucose and Oxalic Acid as a Double Substrate

et al. 2005

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Oscillations in a Belousov-Zhabotinskii (B-Z) system having oxalic acid (OA) and glucose (G) as a mixed organic substrate, neither of which acts as a bromine scavenger, have been investigated. Studies have been performed for (i) varying the concentration of G while keeping the OA concentration fixed and (ii) varying OA but keeping G fixed in a batch reactor. In both cases upper and lower critical limits occur, between which oscillations are observed. Both single and double frequency oscillations have been observed in a wide range of concentrations of G as well as of OA. The induction period in most of the cases was <1 min. When G is fixed and OA is varied, the time pause between the sequential oscillations increases with an increase in OA. On the other hand when OA is fixed and G is varied, the time-pause decreases with an increase in G. The first type of oscillation is Br(-)-controlled, whereas the second is non-Br(-)-controlled. The order of addition of G and OA in the last has no influence on the induction period. It influences, however, the oscillatory characteristics. Br(2) evolution in the G + OA + Ce(4+) + BrO(3)(-) + H(2)SO(4) reaction system has been investigated spectrophotometrically. ESR and polymerization studies indicate the important role of free radicals in influencing the reaction mechanism. A tentative dual control mechanism has been suggested involving autocatalysis of HBrO(2) and BrO2*.

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Section: Discussionmentioning

confidence: 99%

Dual Control Mechanism in a Belousov−Zhabotinskii (B−Z) Oscillator with Glucose and Oxalic Acid as a Double Substrate

et al. 2005

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“…Deionized water from Millipore Milli-RO 20 (reverse osmosis) was used. Solutions of Mn(III) [6], [7], and 2ϩ…”

Section: Experimental Materialsmentioning

confidence: 99%

Kinetic study of the Ce(III)-, Mn(II)-, or ferroin-catalyzed Belousov-Zhabotinsky reaction with pyruvic acid

Lin

Jwo

2000

Int. J. Chem. Kinet.

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“…Deionized water from Millipore Milli-RO 20 (reverse osmosis) was used. Solutions of Mn(III) ion in aqueous sulfuric acid were freshly prepared by reacting a known amount of Ce(IV) ion with at least 100-fold excess of Mn(OAc) 2 in aqueous sulfuric acid [23]. The Mn(III) solution so prepared is stable in aqueous solution with [H 2 SO 4 ] Ն 1 M, and the presence of Ce(III) and Mn(II) ions in the Mn(III) solution does not affect the kinetics of the reactions involving Mn(III) ion.…”

Section: Experimental Materialsmentioning

confidence: 99%

Kinetic study of the Ce(iii)- or Mn(ii)-catalyzed Belousov-Zhabotinsky reactions with mixed organic acid/ketone substrates

Lee

Jwo

1998

Int. J. Chem. Kinet.

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In a stirred batch reactor, the Ce(III)-or Mn(II)-catalyzed Belousov-Zhabotinsky reaction with mixed organic acid/ketone substrates exhibits oscillatory behavior. The organic acids studied here are: dl-mandelic acid (MDA), dl-4-bromomandelic acid (BMDA), and dl-4-hydroxymandelic acid (HMDA), and the ketones are: acetone (Me 2 CO), methyl ethyl ketone (MeCOEt), diethyl ketone (Et 2 CO), acetophenone (MeCOPh), and cyclohexanone ((CH 2 ) 5 CO). The effects of bromate ion, organic acid, ketone, metal-ion catalyst, and sulfuric acid concentrations on the oscillatory patterns are investigated. Both conventional and stopped-flow methods are applied to study the kinetics of the oxidation reactions of the above organic acids by Ce(IV) or Mn(III) ion. The order of relative reactivities of the oxidation reactions of organic acids in 1 M H 2 SO 4 is Mn(III)9 HMDA reaction Ͼ Ce(IV)9HMDA reaction Ͼ Mn(III)9BMDA, reaction Ͼ Mn(III)9MDA reaction Ͼ Ce(IV)9BMDA reaction Ͼ reaction. Spectrophotometric study of the bromination reactions of the above Ce(IV)9 MDA ketones shows that these reactions are zero-order with respect to bromine and first-order with respect to ketone and that ketone enolization is the rate-determining step. The order of relative rates of bromination or enolization reactions of ketones in 1 M H 2 SO 4 is (CH ) CO Ͼ Ͼ 2 5

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Kinetic study of some reactions related to the Mn(II)‐catalyzed bromate‐saccharide oscillating reactions

Cited by 15 publications

References 22 publications

Dual Control Mechanism in a Belousov−Zhabotinskii (B−Z) Oscillator with Glucose and Oxalic Acid as a Double Substrate

Dual Control Mechanism in a Belousov−Zhabotinskii (B−Z) Oscillator with Glucose and Oxalic Acid as a Double Substrate

Kinetic study of the Ce(III)-, Mn(II)-, or ferroin-catalyzed Belousov-Zhabotinsky reaction with pyruvic acid

Kinetic study of the Ce(iii)- or Mn(ii)-catalyzed Belousov-Zhabotinsky reactions with mixed organic acid/ketone substrates

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