Oxyhalogen–sulfur chemistry Oxidation of 2-aminoethanethiolsulfuric acid by iodate in acidic medium
Abstract
The oxidation of 2-aminoethanethiolsulfuric acid, AETSA, by iodate
has been studied in highly acidic media. The reaction is very slow and
shows some clock-reaction characteristics in which iodine is formed
after some induction period. The oxidation of AETSA involves the
oxidation of only one of the sulfur atoms to
SO
4
2-
. The other sulfur atom remains attached to
the carbon chain as a sulfonic acid (taurine). The stoichiometry of
the reaction is:
IO
3
-
+H
2
NCH
2
CH
2
S–SO
3
H+H
2
O→
H
2
NCH
2
CH
2
SO
3
H+I
-
+SO
4
2-
+2H
+
. The reaction of
I
2
and AETSA was found to be slow and autoinhibitory as the
I
-
formed combines with the remaining I
2
to form
the relatively unreactive triiodide ion, I
3
-
.
The second-order rate constant for the reaction between I
2
and AETSA was determined as 16.7±2.3 M
-1
s
-1
.
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