Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
POLAROGRAPHY OF THE CIS-DICYANOBIS(ETHYLENEDIAMINE)CHROMIUM(III) COMPLEX
Nobufumi Maki
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1974 Volume 3 Issue 9 Pages 983-986

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Abstract

The cis-[CrIII(CN)2en2]ClO4 complex gave rise to a two-stepped wave responsible for the reductions of Cr(III) to Cr(II) and to Cr(I) state at the dropping mercury electrode(DME) in dimethyl sulfoxide(DMSO). The reduction of the first step is reversible, while that of the second is quasi-reversible. The standard redox potential of the Cr(III)/Cr(II) couple was −1.586 V (vs. aq. SCE). In aqueous solutions containing 0.5 M Na2SO4 or acetate buffer, however, the cis-[Cr(CN)2en2]+ ion gave rise to only one irreversible wave for the reduction of Cr(III) to Cr(II) even in the presence of ethylenediamine in a large excess. Unlike the cases of cis-[Co(CN)2en2]+ and cis-[Co(CN)2dip2]+, the aquation of the resulting Cr(II) complex occurs so fast that a cyanide disproportionate reaction cannot be observed under such conditions.

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