The Reduction of Isothiocyanato-ammine Complexes of Chromium(III) at the Dropping Mercury Electrode

The reduction of a series of isothiocyanato-ammine chromium(III) complexes [Cr(NCS)p-(NH3)6−p](3−p)+ at the dropping mercury electrode has been studied. The direct current, the alternating current and the Kalousek polarograms of these complexes have been measured in various supporting electrolyte solutions. The nature of the reduction waves, corresponding to the one-electron reduction of chromium(III) to chromium(II), has been discussed.