The oscillatory Belousov–Zhabotinsky reaction with flavones in batch systems using aqueous–DMF mixed medium

Abstract

G. MAYA, P.V. LALITHA, and R. RAMASWAMY. Can. J. Chem. 72, 1537Chem. 72, (1994. Oscillatory systems of the Belousov-Zhabotinsky type with flavones as substrates are described for the first time. Since quercetin and morin are water insoluble, a mixed medium containing DMF and water was used with one of the three catalysts Ce(III), ferroin, or Mn(I1). The oscillatory behaviour of a water-soluble substrate (gallic acid) was studied in nine different aqueousorganic mixed media as well as in pure aqueous medium in the bromate-Ce(II1) system. The results obtained from a catalyzed system with quercetin or morin as the substrate in an aqueous-organic mixed medium are in agreement with the accepted (FKN) mechanism for an aqueous system. G. MAYA, P.V. LALITHA et R. RAMASWAMY. Can. J. Chem. 72, 1537 (1994). On dCcrit pour la premikre fois des systkmes oscillatoires du type Belousov-Zhabotinsky impliquant des flavones comme substrats. La quercktine et la morine Ctant insoluble dans l'eau, on a utilisk un milieu mixte contenant du DMF et de l'eau avec un des trois catalyseurs suivants: le Ce(III), la ferro'ine ou le Mn(I1). On a CtudiC le caractkre oscillatoire d'un substrat soluble dans l'eau (l'acide gallique) dans neufs milieux mixtes (eau/solvants organiques) ainsi que dans de l'eau pure dans le systkme bromatel Ce(II1). Les rksultats obtenus dans le systbme catalysC avec la quercCtine ou la morine comme substrats, dans un milieu mixte organique aqueux, sont conformes au micanisme accept6 (FKN) du systkme aqueux.[Traduit par la RCdaction]

Mechanism and Phenomenology of an Oscillating Chemical Reaction

“…Dimethoxybenzoic acid (veratric) [85] and dihydrobenzoic acid (vanillin) system has been studied using EPR in a mixed medium of water and acetonitrile with manganese as catalyst, and flavones have been used as substrates in aqueous-DMF mixed media [87]. The behaviour of these systems may be rationalised within the framework of the FKN mechanism and bromide-controlled oscillations.…”

effect of initial reagent concentrations on the oscillatory behavior of the BZ reaction in a batch reactor

“…The overall process of the BZ reaction is the oxidation of an organic substrate such as citric acid or malonic acid by an oxidizing agent (bromate) in the presence of metal ions as catalyst under acidic conditions. Metal ions, such as cerium, iron, and manganese, are widely used as catalysts 7–13. The mechanism of such reactions is explained in detail by Field, Koros, and Noyes (FKN) 3–5.…”