On the interaction of vanadium species with the monoisoamyl ester of meso-2,3-dimercaptosuccinic acid

Abstract

The interaction of the VO2+ cation with the monoisoamyl ester of meso-2,3-dimercaptosuccinic acid (MiADMSA) was investigated by electron absorption spectroscopy in aqueous solutions at different pH values. The spectral behavior, complemented with a spectrophotometric titration, shows the generation of a [VO(MiADMSA)2]⁴⁻ complex in which the oxocation interacts with two pairs of deprotonated –SH groups of the ester. Besides, MiADMSA rapidly reduces VO₃− to VO²⁺, which might be chelated by an excess of the ester, and also produces relatively rapid reduction of V₂O₅ suspensions at pH = 6.5. The results of this study suggest that MiADMSA might be a potentially useful detoxification agent for vanadium.