Summary
FeIII reacts with mercaptocarboxylic acids (HORSH), such as 2-mercaptoethanoic acid, 2-mercaptopropanoic acid, 2-mercapto-1,4-butanedioic acid and penicillamine (2-amino3-methyl-3-mercaptobutanoic acid) to give, in perchloric acid medium, 1∶1 complexes, Fe3++HORSH⇄Fe(OSR)++ 2H+. These complexes then undergo redox decomposition to give a disulphide dimer: 2Fe(OSR)++2H+⇄2Fe2++ HOR-S- S- ROH. The present study reports equilibrium data on the stability of the intermediate complexes, and kinetic data for the fast complex formation, as well as for the slower redox decomposition.
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Baiocchi, C., Mentasti, E. & Arselli, P. Kinetics and mechanisms of complex formation and redox reactions of iron(III) with mercaptocarboxylic ligands in acid perchlorate media. Transition Met Chem 8, 40–45 (1983). https://doi.org/10.1007/BF00618796
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DOI: https://doi.org/10.1007/BF00618796