Oxyhalogen-sulfur chemistry: Non-linear oxidation of 2-aminoethanethiolsulfuric acid (AETSA) by bromate in acidic medium

James Darkwa; Claudius Mundoma; Reuben H. Simoyi

doi:10.1039/FT9969204407

Oxyhalogen-sulfur chemistry: Non-linear oxidation of 2-aminoethanethiolsulfuric acid (AETSA) by bromate in acidic medium

James Darkwa, Claudius Mundoma, Reuben H. Simoyi

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

The reaction between bromate and 2-aminoethanethiolsulfuric acid, H₂NCH₂CH₂S-SO₃H (AETSA), has been studied in high acid environments. The stoichiometry in excess AETSA is BrO₃^- + H₂NCH₂CH₂S-SO₃H + H₂O → H₂NCH₂CH₂SO₃H + SO₄^2- + 2H⁺ + Br^- . In excess BrO₃^- the stoichiometry is: 7BrO₃^- + 5H₂NCH₂CH₂S-SO₃H → 5Br(H)NCH₂CH₂SO₃H + 5SO₄^2- + Br₂ + 3H⁺ + H₂O. The reaction displays clock reaction characteristics in which there is initial quiescence followed by a sudden and rapid formation of Br₂(aq). The oxidation proceeds by successive addition of oxygen on the inner sulfur atom followed by cleavage of the S-S bond to form taurine and SO₄^2-. The Br₂(aq) and the HOBr in solution oxidize the taurine to form a mixture of monobromotaurine and dibromotaurine. Computer simulations of a proposed 13-step reaction scheme produced a reasonable fit to the experimental data.

Original language	English
Pages (from-to)	4407-4413
Number of pages	7
Journal	Journal of the Chemical Society - Faraday Transactions
Volume	92
Issue number	22
DOIs	https://doi.org/10.1039/FT9969204407
Publication status	Published - 21 Nov 1996
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry

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10.1039/FT9969204407

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title = "Oxyhalogen-sulfur chemistry: Non-linear oxidation of 2-aminoethanethiolsulfuric acid (AETSA) by bromate in acidic medium",

abstract = "The reaction between bromate and 2-aminoethanethiolsulfuric acid, H2NCH2CH2S-SO3H (AETSA), has been studied in high acid environments. The stoichiometry in excess AETSA is BrO3- + H2NCH2CH2S-SO3H + H2O → H2NCH2CH2SO3H + SO42- + 2H+ + Br- . In excess BrO3- the stoichiometry is: 7BrO3- + 5H2NCH2CH2S-SO3H → 5Br(H)NCH2CH2SO3H + 5SO42- + Br2 + 3H+ + H2O. The reaction displays clock reaction characteristics in which there is initial quiescence followed by a sudden and rapid formation of Br2(aq). The oxidation proceeds by successive addition of oxygen on the inner sulfur atom followed by cleavage of the S-S bond to form taurine and SO42-. The Br2(aq) and the HOBr in solution oxidize the taurine to form a mixture of monobromotaurine and dibromotaurine. Computer simulations of a proposed 13-step reaction scheme produced a reasonable fit to the experimental data.",

author = "James Darkwa and Claudius Mundoma and Simoyi, {Reuben H.}",

year = "1996",

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AU - Darkwa, James

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AU - Simoyi, Reuben H.

PY - 1996/11/21

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N2 - The reaction between bromate and 2-aminoethanethiolsulfuric acid, H2NCH2CH2S-SO3H (AETSA), has been studied in high acid environments. The stoichiometry in excess AETSA is BrO3- + H2NCH2CH2S-SO3H + H2O → H2NCH2CH2SO3H + SO42- + 2H+ + Br- . In excess BrO3- the stoichiometry is: 7BrO3- + 5H2NCH2CH2S-SO3H → 5Br(H)NCH2CH2SO3H + 5SO42- + Br2 + 3H+ + H2O. The reaction displays clock reaction characteristics in which there is initial quiescence followed by a sudden and rapid formation of Br2(aq). The oxidation proceeds by successive addition of oxygen on the inner sulfur atom followed by cleavage of the S-S bond to form taurine and SO42-. The Br2(aq) and the HOBr in solution oxidize the taurine to form a mixture of monobromotaurine and dibromotaurine. Computer simulations of a proposed 13-step reaction scheme produced a reasonable fit to the experimental data.

AB - The reaction between bromate and 2-aminoethanethiolsulfuric acid, H2NCH2CH2S-SO3H (AETSA), has been studied in high acid environments. The stoichiometry in excess AETSA is BrO3- + H2NCH2CH2S-SO3H + H2O → H2NCH2CH2SO3H + SO42- + 2H+ + Br- . In excess BrO3- the stoichiometry is: 7BrO3- + 5H2NCH2CH2S-SO3H → 5Br(H)NCH2CH2SO3H + 5SO42- + Br2 + 3H+ + H2O. The reaction displays clock reaction characteristics in which there is initial quiescence followed by a sudden and rapid formation of Br2(aq). The oxidation proceeds by successive addition of oxygen on the inner sulfur atom followed by cleavage of the S-S bond to form taurine and SO42-. The Br2(aq) and the HOBr in solution oxidize the taurine to form a mixture of monobromotaurine and dibromotaurine. Computer simulations of a proposed 13-step reaction scheme produced a reasonable fit to the experimental data.

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Oxyhalogen-sulfur chemistry: Non-linear oxidation of 2-aminoethanethiolsulfuric acid (AETSA) by bromate in acidic medium

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