Mechanism of the oxidation of 2-mercaptoacetic acid by enH2[(FeHEDTA)2O].6H2O in aqueous acid medium

Abstract

 The kinetics and mechanisms of the oxidation of 2-mercaptoacetic acid (RSH) by the binuclear complex enH₂[(FeHEDTA)₂O].6H₂O have been studied spectrophotometrically at 475 nm. At 28.0 ± 0.1^oC and I=1.0mol/dm³ (NaClO₄), the oxidation is first order in both the reductant and oxidant concentrations.  Added anions, SO₄^2- and NO₃^-, did not affect the rate of the _{RSH-[(FeHEDTA)2O]} reaction. The results have been rationalized in terms of plausible outer-sphere electron transfer mechanism.