The reduction of carbonyl compounds at carbon electrodes in acidic water/methanol mixtures
The reduction of carbonyl compounds at carbon electrodes in acidic water/methanol mixtures
The voltammetry of benzaldehyde in acidic methanol/water mixtures is shown to depend strongly on the cathode material. At pH 1, benzaldehyde always reduces in two 1e(-) steps and the first step is always reversible. On the other hand, the potential for the second reduction step varies strongly with cathode material; at vitreous carbon, the second step occurs at much more negative potential than at lead or mercury, giving much better resolution of the two reduction waves. In citrate buffer, pH 4, the first reduction step is shifted negative; as a result, at lead a single 2e(-) wave is seen but at vitreous carbon, two 1e(-) steps are still observed. These changes in voltammetry with cathode material are shown to be general for both aldehydes and ketones.
benzaldehyde, reduction, carbon cathodes, rotating disc electrode
voltammetryaromatic-aldehydes, flow cell, electrosyntheses
141-144
Libot, C.
c251e37d-683f-42f2-af14-41404061feaa
Pletcher, D.
8f934180-8464-46d8-a79b-6e89fe693bad
1 March 2000
Libot, C.
c251e37d-683f-42f2-af14-41404061feaa
Pletcher, D.
8f934180-8464-46d8-a79b-6e89fe693bad
Libot, C. and Pletcher, D.
(2000)
The reduction of carbonyl compounds at carbon electrodes in acidic water/methanol mixtures.
Electrochemistry Communications, 2 (3), .
(doi:10.1016/S1388-2481(99)00157-5).
Abstract
The voltammetry of benzaldehyde in acidic methanol/water mixtures is shown to depend strongly on the cathode material. At pH 1, benzaldehyde always reduces in two 1e(-) steps and the first step is always reversible. On the other hand, the potential for the second reduction step varies strongly with cathode material; at vitreous carbon, the second step occurs at much more negative potential than at lead or mercury, giving much better resolution of the two reduction waves. In citrate buffer, pH 4, the first reduction step is shifted negative; as a result, at lead a single 2e(-) wave is seen but at vitreous carbon, two 1e(-) steps are still observed. These changes in voltammetry with cathode material are shown to be general for both aldehydes and ketones.
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Published date: 1 March 2000
Keywords:
benzaldehyde, reduction, carbon cathodes, rotating disc electrode
voltammetryaromatic-aldehydes, flow cell, electrosyntheses
Identifiers
Local EPrints ID: 18924
URI: http://eprints.soton.ac.uk/id/eprint/18924
ISSN: 1388-2481
PURE UUID: ec474cff-6b8c-4acc-b928-348fcebbe87c
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Date deposited: 19 Jan 2006
Last modified: 15 Mar 2024 06:09
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Author:
C. Libot
Author:
D. Pletcher
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