Belousov–Zhabotinsky reaction

Computer simulation of the Belousov–Zhabotinsky reaction occurring in a Petri dish
Patterns shown in the Petri dish

A Belousov–Zhabotinsky reaction, or BZ reaction, is one of a class of reactions that serve as a classical example of non-equilibrium thermodynamics, resulting in the establishment of a nonlinear chemical oscillator. The only common element in these oscillators is the inclusion of bromine and an acid. The reactions are important to theoretical chemistry in that they show that chemical reactions do not have to be dominated by equilibrium thermodynamic behavior. These reactions are far from equilibrium and remain so for a significant length of time and evolve chaotically. In this sense, they provide an interesting chemical model of nonequilibrium biological phenomena, and the mathematical models of the BZ reactions themselves are of theoretical interest and simulations.[1]

Plot of the electrode potential of a BZ reaction, using silver electrodes against an Ag/AgNO3 half-cell

An essential aspect of the BZ reaction is its so called "excitability"; under the influence of stimuli, patterns develop in what would otherwise be a perfectly quiescent medium. Some clock reactions such as Briggs–Rauscher and BZ using the tris(bipyridine)ruthenium(II) chloride as catalyst can be excited into self-organising activity through the influence of light.

History

A stirred BZ reaction mixture showing changes in color over time

The discovery of the phenomenon is credited to Boris Belousov. In 1951, while trying to find the non-organic analog to the Krebs cycle, he noted that in a mix of potassium bromate, cerium(IV) sulfate, malonic acid, and citric acid in dilute sulfuric acid, the ratio of concentration of the cerium(IV) and cerium(III) ions oscillated, causing the colour of the solution to oscillate between a yellow solution and a colorless solution. This is due to the cerium(IV) ions being reduced by malonic acid to cerium(III) ions, which are then oxidized back to cerium(IV) ions by bromate(V) ions.

Belousov made two attempts to publish his finding, but was rejected on the grounds that he could not explain his results to the satisfaction of the editors of the journals to which he submitted his results.[2] Soviet biochemist Simon El'evich Shnoll encouraged Belousov to continue his efforts to publish his results. In 1959 his work was finally published in a less respectable, nonreviewed journal.[3]

After Belousov's publication, Schnoll gave the project in 1961 to a graduate student, Anatol Zhabotinsky, who investigated the reaction sequence in detail;[4] however, the results of these men's work were still not widely disseminated, and were not known in the West until a conference in Prague in 1968.

A number of BZ cocktails are available in the chemical literature and on the web. Ferroin, a complex of phenanthroline and iron, is a common indicator. These reactions, if carried out in petri dishes, result in the formation first of colored spots. These spots grow into a series of expanding concentric rings or perhaps expanding spirals similar to the patterns generated by a cyclic cellular automaton. The colors disappear if the dishes are shaken, and then reappear. The waves continue until the reagents are consumed. The reaction can also be performed in a beaker using a magnetic stirrer.

Andrew Adamatzky,[5] a computer scientist in the University of the West of England, reported on liquid logic gates using the BZ reaction.[6]

Strikingly similar oscillatory spiral patterns appear elsewhere in nature, at very different spatial and temporal scales, for example the growth pattern of Dictyostelium discoideum, a soil-dwelling amoeba colony.[7] In the BZ reaction, the size of the interacting elements is molecular and the time scale of the reaction is minutes. In the case of the soil amoeba, the size of the elements is typical of single-celled organisms and the times involved are on the order of days to years.

Investigators are also exploring the creation of a "wet computer", using self-creating "cells" and other techniques to mimic certain properties of neurons.[8]

Chemical mechanism

The mechanism for this reaction is very complex and is thought to involve around 18 different steps which have been the subject of a number of research papers.[9][10]

In a way similar to the Briggs–Rauscher reaction, two key processes (both of which are auto-catalytic) occur; process A generates molecular bromine, giving the red colour, and process B consumes the bromine to give bromide ions.[11]

One of the most common variations on this reaction uses malonic acid (CH2(CO2H)2) as the acid and potassium bromate (KBrO3) as the source of bromine. The overall equation is:[11]

3CH2(CO2H)2 + 4BrO−
3 → 4Br− + 9CO2 + 6H2O

Variants

Many variants of the reaction exist. The only key chemical is the bromate oxidizer. The catalyst ion is most often cerium, but it can be also manganese, or complexes of iron, ruthenium, cobalt, copper, chromium, silver, nickel and osmium. Many different reductants can be used. (Zhabotinsky, 1964b; Field and Burger, 1985)[12]

Many different patterns can be observed when the reaction is run in a microemulsion.

See also

Wikimedia Commons has media related to Belousov-Zhabotinsky reaction.

References

  1. ↑ Zhang, Dongmei; Györgyi, László; Peltier, William R. (1993). "Deterministic chaos in the Belousov–Zhabotinsky reaction: Experiments and simulations". Chaos: an Interdisciplinary Journal of Nonlinear Science. 3 (4): 723–745. Bibcode:1993Chaos...3..723Z. PMID 12780076. doi:10.1063/1.165933.
  2. ↑ Winfree, A. T. (1984). "The Prehistory of the Belousov-Zhabotinsky Oscillator" (PDF). Journal of Chemical Education. 61: 661–663. Bibcode:1984JChEd..61..661W. doi:10.1021/ed061p661.
  3. ↑ B. P. Belousov (1959). "Периодически действующая реакция и ее механизм" [Periodically acting reaction and its mechanism]. Сборник рефератов по радиационной медицине. 147: 145.
  4. ↑ A. M. Zhabotinsky (1964). "Периодический процесс окисления малоновой кислоты растворе" [Periodical process of oxidation of malonic acid solution]. Биофизика. 9: 306–311.
  5. ↑ "Andy Adamatzky". University of the West of England, Bristol.
  6. ↑ Motoike, Ikuko N.; Adamatzky, Andrew (2005). "Three-valued logic gates in reaction–diffusion excitable media". Chaos, Solitons & Fractals. 24: 107–14. Bibcode:2005CSF....24..107M. doi:10.1016/j.chaos.2004.07.021.
  7. ↑ "Picture Gallery". Department of Biophysics, Otto-von-Guericke University Magdeburg.
  8. ↑ Palmer, J. (2010-01-11). "Chemical computer that mimics neurons to be created". BBC (Science News).
  9. ↑ Field, Richard J.; Foersterling, Horst Dieter (1986). "On the oxybromine chemistry rate constants with cerium ions in the Field-Koeroes-Noyes mechanism of the Belousov-Zhabotinskii reaction: The equilibrium HBrO2 + BrO3- + H+ .dblharw. 2BrO.ovrhdot.2 + H2O". The Journal of Physical Chemistry. 90 (21): 5400–7. doi:10.1021/j100412a101.
  10. ↑ Sirimungkala, Atchara; Försterling, Horst-Dieter; Dlask, Vladimir; Field, Richard J. (1999). "Bromination Reactions Important in the Mechanism of the Belousov−Zhabotinsky System". The Journal of Physical Chemistry A. 103 (8): 1038–43. doi:10.1021/jp9825213.
  11. 1 2 Lister, Ted (1995). Classic Chemistry Demonstrations (PDF). London: Education Division, The Royal Society of Chemistry. pp. 3–4. ISBN 978-1-870343-38-1.
  12. ↑ http://www.scholarpedia.org/article/Belousov-Zhabotinsky_reaction

Further reading

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