Electrochemical, Electrocatalytic, and Magnetic Properties of Vanadium-Containing Polyoxometalates

Mono-substituted vanadium-containing Dawson-type polyoxometalates having the general formula alpha(1)-[(VW17X2O62)-W-IV](8-) and alpha(2)-[(VW17X2O62)-W-IV](8-), with X = As or P, were synthesised and subject to a comprehensive electrochemical study comprising the pH dependency. These POMs exhibit an electrocatalytic behaviour towards the oxidation of thiols (namely cysteine), rendering them interesting species for mimicking oxidative stress situations, at physiological pH values. The efficiency of the electro-oxidation was assessed with thiols of different nature, and the substrate that responded best was used to compare the electrocatalytic capabilities of the POM series. The magnetic behaviour of these POMs was also evaluated and compared to their analogues, alpha(1)- and alpha(2)-[(VW17X2O62)-W-V](7-) (X = As or P), at low temperatures and showed, as expected, a paramagnetic behaviour of V-IV based compounds.