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A dual‐phase oscillatory behavior in Belousov–Zhabotinsky system with vanillin as the substrate
Author(s) -
Sridevi V.,
Ramaswamy R.
Publication year - 1998
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/(sici)1097-4601(1998)30:3<201::aid-kin5>3.0.co;2-w
Subject(s) - chemistry , vanillin , substrate (aquarium) , catalysis , belousov–zhabotinsky reaction , phase (matter) , vanillic acid , ammonium , organic chemistry , oceanography , geology
Dual‐phase oscillations are observed in Belousov–Zhabotinsky system with 4‐hydroxy‐3‐methoxybenzaldehyde (vanillin) as the substrate and manganous sulphate or ammonium Ce(IV) sulphate as the catalyst. The nonoscillatory period of time between the two phases decreases with increase in the concentration of the catalyst and the substrate. Under uncatalyzed and ferroin catalyzed conditions the system exhibits single‐phase oscillations. The first‐phase oscillations are due to vanillin whereas the second‐phase oscillations are brought about by 4‐hydroxy‐3‐methoxybenzoic acid (vanillic acid) formed during the course of the first‐phase reactions. The reactions are explained with relevant steps of the FKN mechanism. © 1998 John Wiley & Sons, Inc. Int J. Chem. Kinet 30: 201–206, 1998.