Contribution to the chemistry of the belousov - Zhabotinsky reaction. Products of the ferriin - Bromomalonic acid and the ferriin - Malonic acid reactions

L. Hegedûs, Horst Dieter Försterling, Lavinia Onel, M. Wittmann, Z. Noszticzius

Research output: Article

12 Citations (Scopus)

Abstract

In the present mechanistic schemes of the ferroin-catalyzed oscillatory Belousov - Zhabotinsky (BZ) reaction the oxidation of the organic substrates (bromomalonic or malonic acid) by ferriin (the oxidized form of the catalyst) plays an important role. As the organic products of these reactions were not yet identified experimentally, they were studied here by an HPLC technique. It was found that the main organic oxidation product of bromomalonic acid is bromo-ethene-tricarboxylic acid (BrEETRA), the same compound that is formed when bromomalonic acid is oxidized by Ce4+ (another catalyst of the BZ reaction). Formation of BrEETRA is explained here by a new mechanism that is more realistic than the one suggested earlier. To find any oxidation product of malonic acid in the ferriin - malonic acid reaction was not successful, however. Neither ethane-tetracarboxylic acid (ETA) nor malonyl malonate (MAMA), the usual products of the Ce4+ - malonic acid reaction, nor any other organic acid, not even CO2, was found as a product of the reaction. We propose that malonic acid is not oxidized in the ferriin - malonic acid reaction, and it plays only the role of a complex forming catalyst in a process where Fe3+ oxidizes mostly its phenantroline ligand.

Original languageEnglish
Pages (from-to)12839-12844
Number of pages6
JournalJournal of Physical Chemistry A
Volume110
Issue number47
DOIs
Publication statusPublished - nov. 30 2006

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chemistry
acids
products
Tricarboxylic Acids
Oxidation
Catalysts
Ethane
catalysts
Organic acids
oxidation
malonic acid
bromomalonic acid
ferriin
Ligands
Acids
ethane
Substrates
ligands
ethylene

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

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title = "Contribution to the chemistry of the belousov - Zhabotinsky reaction. Products of the ferriin - Bromomalonic acid and the ferriin - Malonic acid reactions",
abstract = "In the present mechanistic schemes of the ferroin-catalyzed oscillatory Belousov - Zhabotinsky (BZ) reaction the oxidation of the organic substrates (bromomalonic or malonic acid) by ferriin (the oxidized form of the catalyst) plays an important role. As the organic products of these reactions were not yet identified experimentally, they were studied here by an HPLC technique. It was found that the main organic oxidation product of bromomalonic acid is bromo-ethene-tricarboxylic acid (BrEETRA), the same compound that is formed when bromomalonic acid is oxidized by Ce4+ (another catalyst of the BZ reaction). Formation of BrEETRA is explained here by a new mechanism that is more realistic than the one suggested earlier. To find any oxidation product of malonic acid in the ferriin - malonic acid reaction was not successful, however. Neither ethane-tetracarboxylic acid (ETA) nor malonyl malonate (MAMA), the usual products of the Ce4+ - malonic acid reaction, nor any other organic acid, not even CO2, was found as a product of the reaction. We propose that malonic acid is not oxidized in the ferriin - malonic acid reaction, and it plays only the role of a complex forming catalyst in a process where Fe3+ oxidizes mostly its phenantroline ligand.",
author = "L. Heged{\^u}s and F{\"o}rsterling, {Horst Dieter} and Lavinia Onel and M. Wittmann and Z. Noszticzius",
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T1 - Contribution to the chemistry of the belousov - Zhabotinsky reaction. Products of the ferriin - Bromomalonic acid and the ferriin - Malonic acid reactions

AU - Hegedûs, L.

AU - Försterling, Horst Dieter

AU - Onel, Lavinia

AU - Wittmann, M.

AU - Noszticzius, Z.

PY - 2006/11/30

Y1 - 2006/11/30

N2 - In the present mechanistic schemes of the ferroin-catalyzed oscillatory Belousov - Zhabotinsky (BZ) reaction the oxidation of the organic substrates (bromomalonic or malonic acid) by ferriin (the oxidized form of the catalyst) plays an important role. As the organic products of these reactions were not yet identified experimentally, they were studied here by an HPLC technique. It was found that the main organic oxidation product of bromomalonic acid is bromo-ethene-tricarboxylic acid (BrEETRA), the same compound that is formed when bromomalonic acid is oxidized by Ce4+ (another catalyst of the BZ reaction). Formation of BrEETRA is explained here by a new mechanism that is more realistic than the one suggested earlier. To find any oxidation product of malonic acid in the ferriin - malonic acid reaction was not successful, however. Neither ethane-tetracarboxylic acid (ETA) nor malonyl malonate (MAMA), the usual products of the Ce4+ - malonic acid reaction, nor any other organic acid, not even CO2, was found as a product of the reaction. We propose that malonic acid is not oxidized in the ferriin - malonic acid reaction, and it plays only the role of a complex forming catalyst in a process where Fe3+ oxidizes mostly its phenantroline ligand.

AB - In the present mechanistic schemes of the ferroin-catalyzed oscillatory Belousov - Zhabotinsky (BZ) reaction the oxidation of the organic substrates (bromomalonic or malonic acid) by ferriin (the oxidized form of the catalyst) plays an important role. As the organic products of these reactions were not yet identified experimentally, they were studied here by an HPLC technique. It was found that the main organic oxidation product of bromomalonic acid is bromo-ethene-tricarboxylic acid (BrEETRA), the same compound that is formed when bromomalonic acid is oxidized by Ce4+ (another catalyst of the BZ reaction). Formation of BrEETRA is explained here by a new mechanism that is more realistic than the one suggested earlier. To find any oxidation product of malonic acid in the ferriin - malonic acid reaction was not successful, however. Neither ethane-tetracarboxylic acid (ETA) nor malonyl malonate (MAMA), the usual products of the Ce4+ - malonic acid reaction, nor any other organic acid, not even CO2, was found as a product of the reaction. We propose that malonic acid is not oxidized in the ferriin - malonic acid reaction, and it plays only the role of a complex forming catalyst in a process where Fe3+ oxidizes mostly its phenantroline ligand.

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