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

✍ Scribed by Hsing-Lien Lin; Yueh-O Yu; Jing-Jer Jwo

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
323 KB
Volume
32
Category
Article
ISSN
0538-8066

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✦ Synopsis

The Ce(III)-, Mn(II)-, or ferroin reaction of bromate ion and 2ϩ (Fe(phen) )-catalyzed 3 pyruvic acid (PA) or its dimer exhibits oscillatory behavior. Both the open-chain dimer (parapyruvic acid, ␥-methyl-␥-hydroxyl-␣-keto-glutaric acid, DPA1) and the cyclic-form dimer (␣keto-␥-valerolactone-␥-carboxylic acid, DPA2) show more sustained oscillations than PA monomer. Ferroin behaves differently from Ce(III) or Mn(II) ion in catalyzing these oscillating systems. The kinetics of reactions of PA, 3-brompyruvic acid (BrPA), DPA1, or DPA2 with Ce(IV), Mn(III), ion were investigated. The order of relative reactivity of pyruvic acids 3ϩ Fe(phen) 3 toward reaction with Ce(IV), Mn(III), or ion is DPA2 Ͼ DPA1 Ͼ BrPA Ͼ PA and 3ϩ Fe(phen) 3 that of metal ions toward reaction with pyruvic acids is The 3ϩ Mn(III) Ͼ Ce(IV) Ͼ Fe(phen) .

3 rates of bromination reactions of pyruvic acids are independent of the concentration of bromine and the order of reactivity toward bromination is (DPA1, DPA2) Ͼ BrPA Ͼ PA. Experimental results are rationalized.

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