POLAROGRAPHY OF VANADIUM (II) COMPLEXES

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Abstract
Polarograms taken in solutions of vanadium (II) perchlorate, 0.10 N with respect to perchloric acid and at an ionic strength of 0.20, indicate that vanadium (II) exists predominately as a dimer in the concentration region of 5 millimolar. Oxidation of one of these ions appears to make the second relatively inert towards oxidation until labilized by further oxidation of the first to vanadyl ion.No indication of complex formation of vanadium (II) was found with sulphate, chloride, iodide, or bromide ions. The existence of fluoro and thiocyanato complexes was noted, the vanadium (II) complexes having lower formation constants than the corresponding vanadium (III) complexes.