Abstract
Polarographic investigations were carried out on vanadium(III) chloride, vanadium(V) oxoperchlorate and chromium(III) chloride in dimethylsulfoxide and N,N-dimethylformamide; the half-wave potentials (vs. aqueous saturated calomel electrode), the nature of the limiting currents, the temperature coefficients of the half-wave potentials and the wave heights, and the reversibility or irreversibility of the electrode processes were determined in 0.1 M solutions of tetraethylammonium perchlorate at 25.0°. VCl 3 shows reversible V III–V II waves, V IV is irreversibly reduced to V II, and CrCl 3 exhibits a polarographic behavior corresponding to the stepwise reduction sequence Cr III–Cr II –Cr 0. The electrode mechanisms, the half-wave potentials in different solvents, analytical aspects and the influence of water have been discussed.
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