Journal of the Chemical Society - Faraday Transactions p. 4407 - 4413 (1996)
Update date:2022-08-11
Topics:
Darkwa, James
Mundoma, Claudius
Simoyi, Reuben H.
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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