Reduction of some acidopentaaquochromium(III) complexes at the mercury electrode : effect of maximum suppressors and free ligand

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Kooy van der, A. and Gellings, P.J. (1970) Reduction of some acidopentaaquochromium(III) complexes at the mercury electrode : effect of maximum suppressors and free ligand. Journal of Inorganic and Nuclear Chemistry, 32 (10). p. 3308. ISSN 0022-1902

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Abstract:The complexes [CrNCS(H2O)5]2+, [CrCl(H2O)5]2+, [Cr(H2O)5′2+ and [Cr(H2O)6]3+ were studied by polarography and cyclic voltammetry in aqueous solution. It is shown that Triton X-100 and gelatine shift the polarographic waves to more negative potentials. In 1M NaClO4---HClO4 the half-wave potentials in the absence of maximum suppressor are (in Volts vs. SCE): CrNCS2+: −0·675; CrCl2+:−0·62; CrF2+:−1·105; Cr3+:−0·90 (water omitted in the formula). All reductions are irreversible. Replacement of NaClO4 by NaSCN makes the reduction of CrNCS2+ and CrCl2+ more reversible and shifts 50 mV per log [SCN−] unit to more negative potentials for CrNCS2+ and 66 mV for CrCl2+. It is suggested that CrNCS2+ and CrCl2+ may be reduced via a mechanism analogous to the inner-sphere mechanism in homogeneous reductions.
Item Type:Article
Copyright:© 1970 Elsevier Science
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Link to this item:http://purl.utwente.nl/publications/68108
Official URL:http://dx.doi.org/10.1016/0022-1902(70)80216-0
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