Microwave activation of electrochemical processes: enhanced electrodehalogenation in organic solvent media.

The effect of high-intensity microwave radiation focused into a "hot spot" region in the vicinity of an electrode on electrochemical processes with and without coupled chemical reaction steps has been investigated in organic solvent media. First, the electrochemically reversible oxidation...

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Main Authors: Tsai, Y, Coles, B, Compton, R, Marken, F
Format: Journal article
Language:English
Published: 2002
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author Tsai, Y
Coles, B
Compton, R
Marken, F
author_facet Tsai, Y
Coles, B
Compton, R
Marken, F
author_sort Tsai, Y
collection OXFORD
description The effect of high-intensity microwave radiation focused into a "hot spot" region in the vicinity of an electrode on electrochemical processes with and without coupled chemical reaction steps has been investigated in organic solvent media. First, the electrochemically reversible oxidation of ferrocene in acetonitrile and DMF is shown to be affected by microwave-induced thermal activation, resulting in increased currents and voltammetric wave shape effects. A FIDAP simulation investigation allows quantitative insight into the temperature distribution and concentration gradients at the electrode / solution interface. Next, the effect of intense microwave radiation on electroorganic reactions is considered for the case of ECE processes. Experimental data for the reduction of p-bromonitrobenzene, o-bromonitrobenzene, and m-iodonitrobenzene in DMF and acetonitrile are analyzed in terms of an electron transfer (E), followed by a chemical dehalogenation step (C), and finally followed by another electron-transfer step (E). The presence of the "hot spot" in the solution phase favors processes with high activation barriers.
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spelling oxford-uuid:96aa13fe-a01f-4b7a-8b18-cc3bcb02a3932022-03-26T23:54:30ZMicrowave activation of electrochemical processes: enhanced electrodehalogenation in organic solvent media.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:96aa13fe-a01f-4b7a-8b18-cc3bcb02a393EnglishSymplectic Elements at Oxford2002Tsai, YColes, BCompton, RMarken, FThe effect of high-intensity microwave radiation focused into a "hot spot" region in the vicinity of an electrode on electrochemical processes with and without coupled chemical reaction steps has been investigated in organic solvent media. First, the electrochemically reversible oxidation of ferrocene in acetonitrile and DMF is shown to be affected by microwave-induced thermal activation, resulting in increased currents and voltammetric wave shape effects. A FIDAP simulation investigation allows quantitative insight into the temperature distribution and concentration gradients at the electrode / solution interface. Next, the effect of intense microwave radiation on electroorganic reactions is considered for the case of ECE processes. Experimental data for the reduction of p-bromonitrobenzene, o-bromonitrobenzene, and m-iodonitrobenzene in DMF and acetonitrile are analyzed in terms of an electron transfer (E), followed by a chemical dehalogenation step (C), and finally followed by another electron-transfer step (E). The presence of the "hot spot" in the solution phase favors processes with high activation barriers.
spellingShingle Tsai, Y
Coles, B
Compton, R
Marken, F
Microwave activation of electrochemical processes: enhanced electrodehalogenation in organic solvent media.
title Microwave activation of electrochemical processes: enhanced electrodehalogenation in organic solvent media.
title_full Microwave activation of electrochemical processes: enhanced electrodehalogenation in organic solvent media.
title_fullStr Microwave activation of electrochemical processes: enhanced electrodehalogenation in organic solvent media.
title_full_unstemmed Microwave activation of electrochemical processes: enhanced electrodehalogenation in organic solvent media.
title_short Microwave activation of electrochemical processes: enhanced electrodehalogenation in organic solvent media.
title_sort microwave activation of electrochemical processes enhanced electrodehalogenation in organic solvent media
work_keys_str_mv AT tsaiy microwaveactivationofelectrochemicalprocessesenhancedelectrodehalogenationinorganicsolventmedia
AT colesb microwaveactivationofelectrochemicalprocessesenhancedelectrodehalogenationinorganicsolventmedia
AT comptonr microwaveactivationofelectrochemicalprocessesenhancedelectrodehalogenationinorganicsolventmedia
AT markenf microwaveactivationofelectrochemicalprocessesenhancedelectrodehalogenationinorganicsolventmedia