Electrochemical Behavior and Semiempirical Approach to the Electroadsorption of 3-Buten-2-one and 2-Butanone on Platinum

Zinola, C.F.; Luna, A.M. Castro

doi:10.1006/jcis.1999.6480

Cited by 1 publication

(1 citation statement)

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“…Studies on the electrochemical reduction of acetophenone, , benzaldehyde, − 5-hydroxymethyllfurfural, − and ethyl pyruvate , have been performed in the context of the electrorefining of biomass-derived compounds. To design efficient electrochemical processes for these conversions, it is important to utilize our knowledge on the electrochemistry of simple organic molecules − and on adsorption structures ,− to build a conceptual understanding on how (inert) functional groups can influence the electrochemistry of complex organic molecules.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Reduction of the Carbonyl Functional Group: The Importance of Adsorption Geometry, Molecular Structure, and Electrode Surface Structure

Bondue

Koper

2019

J. Am. Chem. Soc.

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This paper studies the electrochemical hydrogenation of the carbonyl functional group of acetophenone and 4-acetylpyridine at platinum single-crystal electrodes. Comparison with results obtained for the hydrogenation of acetone featuring an isolated carbonyl functional group reveals the influence of the phenyl ring and the pyridine ring, respectively. Lack of acetone adsorption at Pt(111) and Pt(100) due to a weak interaction between surface and carbonyl functional group renders these surfaces inactive for the hydrogenation of acetone. Adsorption through a strong interaction with the phenyl ring of acetophenone activates the Pt(111) and Pt(100) surfaces for hydrogenation of the acetyl substituent. In agreement with previous results for acetone reduction, the Pt(100) surface is specifically active for the hydrogenolysis reaction, breaking the C–O bond, whereas the other surfaces only hydrogenate the carbonyl functionality. In contrast to the phenyl ring, the pyridine ring has a very different effect: due to the dominant interaction of the N atom of the pyridine ring with the platinum electrode, a vertical adsorption mode is realized. The resulting large physical distance between the carbonyl functional group and the electrode surface inhibits the hydrogenation at all platinum surfaces. This also holds for the Pt(110) electrode, which is otherwise active for the electrochemical hydrogenation of the isolated carbonyl functional group of aliphatic ketones. Our results show how the combination of molecular structure of the reactant and surface structure of the catalyst determine the selective electroreduction of functionalized ketones.

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