1969 Volume 42 Issue 4 Pages 1021-1024
Polarographic behavior of tris(2,2′-bipyridine)chromium(III) perchlorate and tris(ethylenediamine)chromium(III) perchlorate in acetonitrile solutions has been investigated by the measurement of d.c., a.c. and Kalousek polarograms. The bipyridine complex gives a six-step reduction wave when tetraethylammonium perchlorate is used as supporting electrolyte. The limiting currents of the first four steps are all diffusion-controlled, and each of them is of a one-electron reduction process. It has been proposed that at the fourth step univalent tris(2,2′-bipyridine)-chromate anions, [Cr(bipy)3]−, are formed at the electrode surface in acetonitrile. The limiting current of the one-electron reduction wave of tris(ethylenediamine)chromium(III) is increased upon the addition of 2,2′-bipyridine. It was explained as a reduction of an electroactive species, Cr(II)-bipyridine complex, which was formed by the reaction between Cr(II) produced by the reduction of tris(ethylenediamine)chromium(III) complex and 2,2′-bipyridine at the electrode surface.
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