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

✍ Scribed by Chin-chou Ou; Jing-jer Jwo

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
674 KB
Volume
23
Category
Article
ISSN
0538-8066

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✦ Synopsis

In the stirred batch experiment, the Mn(I1)-catalyzed bromate-saccharide reaction in aqueous H2S04 or HC104 solution exhibits damped oscillations in the concentrations of bromide and Mn(I1) ions. Peculiar multiple oscillations are observed in the system with arabinose or ribose. The apparent second-order rate constants of the Mn(II1)-saccharide reactions at 25°C are(0.659, 1.03, 1.76,2.32,and6.95) M-'s-'in 1.00MHzS04and(4.69,7.51, 10.2, 13.5,and36.2) M-' s-' in (2.00-4.00) M HClO4 for (glucose, galactose, xylose, arabinose, and ribose), respectively. At 25"C, the observed pseudo-first-order rate constant of the Mn(III)-Br-reaction is

and the rate constant of the BrZ-Mn(II) reaction is less than 1 x M-' s-'. The second-order rate constants of the Brz-saccharide reactions are (3.65 f 0.15, 11.0 2 0.5, 4.05, 12.5 2 0.7, and 2.62) x M-' s-' at 25°C for glucose, galactose, xylose, arabinose, and ribose, respectively.

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