Reduction of Hexamminechromium(III) Ions at the Dropping Mercury Electrode

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概要

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• The reduction of hexamminechromium(III) ion at the dropping mercury electrode has been studied in neutral and acid aqueous solutions. Hexamminechromium(III) ion gives no well-defined d. c. polarographic wave in an unbuffered neutral solution, whereas in an acid solution it gives a well-defined two-step wave, the first wave corresponding to the reduction of chromium(III) to chromium(II) and the second, to that of chromium(II) to chromium-(0).<BR>The first wave of the d. c. polarogram obtained in an acid solution is diffusion-controlled and gives a slope of the log-plot close to that expected for a reversible wave. The a. c. and the Kalousek polarogram, however, are of the irreversible type. No chemical reaction involving hydrogen ions, ammonium ions or ammonia takes place preceding the electron transfer. Considering these results, the following mechanism is temporarily suggested for the reduction of hexamminechromium(III) ions at the dropping mercury electrode:<BR>[Cr(NH<SUB>3</SUB>)<SUB>6</SUB>]<SUP>3+</SUP>+e\rightleftarrows[Cr(NH<SUB>3</SUB>)<SUB>6</SUB>]<SUP>2+</SUP>[Cr(NH<SUB>3</SUB>)<SUB>6</SUB>]<SUP>2+</SUP>+<I>n</I>H<SUB>2</SUB>O→[Cr(H<SUB>2</SUB>O)<I><SUB>n</SUB></I>(NH<SUB>3</SUB>)<SUB>6－<I>n</I></SUB>]<SUP>2+</SUP>+<I>n</I>NH<SUB>3</SUB>NH<SUB>3</SUB>+H<SUP>+</SUP>\rightleftarrowsNH<SUB>4</SUB><SUP>+</SUP>

• 社団法人 日本化学会の論文

著者

• Sato Gen

  Department Of Chemistry Faculty Of Science And Technology Sophia University

• TANAKA N.

  Department of Health And Physical Education, Kyoto Sangyou University

• Ebata Kazuko

  Department of Chemistry Faculty of Science Tohoku University

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