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

Autor: Hsing-Lien Lin, Yueh-O Yu, Jing-Jer Jwo
Rok vydání: 2000
Předmět:
Zdroj: International Journal of Chemical Kinetics. 32:408-418
ISSN: 1097-4601
0538-8066
DOI: 10.1002/(sici)1097-4601(2000)32:7<408::aid-kin3>3.0.co;2-7
Popis: The Ce(III)-, Mn(II)-, or ferroin (Fe(phen)32+)-catalyzed reaction of bromate ion and pyruvic acid (PA) or its dimer exhibits oscillatory behavior. Both the open-chain dimer (parapyruvic acid, γ-methyl-γ-hydroxyl-α-keto-glutaric acid, DPA1) and the cyclic-form dimer (α-keto-γ-valerolactone-γ-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), Fe(phen)33+ ion were investigated. The order of relative reactivity of pyruvic acids toward reaction with Ce(IV), Mn(III), or Fe(phen)33+ ion is DPA2 > DPA1 > BrPA > PA and that of metal ions toward reaction with pyruvic acids is Mn(III) > Ce(IV) > Fe(phen)33+. The rates of bromination reactions of pyruvic acids are independent of the concentration of bromine and the order of reactivity toward bromination is (DPA1, DPA2) > BrPA > PA. Experimental results are rationalized. © 2000 John Wiley & Sons, Inc. Int J Chem Kinet 32: 408–418, 2000
Databáze: OpenAIRE
Externí odkaz: