Abstract
The pH-dependent hydrolysis of the tetrathiovanadate ion VS 4 3− to vanadate VO 4 3− has been studied. Identification of the species present in reacting solutions has been established by electronic and vanadium-51 NMR spectra. Some VOS 3 3− intermediate has been demonstrated at higher pH. Severe decrease in rate as the reaction proceeds is due to participation of a back reaction involving HS −. Mechanistic models are discussed for this complicated reaction. Copper(II) which has a high affinity for sulphide, catalyses the hydrolysis.
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