Chemical origin of the sustained-like pattern formation observed in the bromate — Dual substrate — Dual catalyst oscillatory batch system |
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Authors: | Krisztina Kurin-Cs?rgei Viktor Horváth and Miklós Orbán |
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Institution: | (1) Institute of Chemistry, Department of Analytical Chemistry, L. E?tv?s University, P.O. Box 32, H-1518 Budapest 112, Hungary |
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Abstract: | The BrO
3
−
— BrAc — Ru(bpy)
3
2+
subsystem is shown to represent the core oscillator that serves as source of the long lasting temporal and spatial periodic
behaviors observed in the BrO
3
−
— H2PO
2
−
— acetone — Mn2+ — Ru(bpy)
3
2+
— acid “double substrate-double catalyst” oscillatory batch system. The BrAc — the substrate of the core oscillator — is
formed and accumulated in the reactions taking place in the six-component system. BrAc was produced in a separate experiment
with bromide, acetone, acid and excess bromate and the mixture was used for bringing about patterns in the thin solution layer
after adding the Ru(bpy)
3
2+
catalyst. The two-dimensional reaction-diffusion patterns that appear in the subsystem and its parent system are very similar
in wave speed, wavelength, color and in the duration of the pattern evolution, therefore a common chemical origin is supposed
to exist in their formation. The role that the BrAc may play in the mechanism of the BrO
3
−
— reductant — acetone — catalyst type oscillators (∼ 30 variants) is also pointed out. |
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Keywords: | Pattern formation bromate oscillators |
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