Electrochemical nanogravimetric study of the electropolymerization of 6-aminoindole and the redox transformations of the polymer formed in aqueous media

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作者
Balázs B. Berkes
Ákos Nemes
Colin E. Moore
Franciska Szabó
György Inzelt
机构
[1] Eötvös Loránd University,Department of Physical Chemistry, Institute of Chemistry
关键词
6-Aminoindole; Electropolymerization; Electrochemical quartz crystal nanobalance; Redox behavior; Overoxidation;
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摘要
The electrochemical quartz crystal nanobalance was employed to study the electropolymerization of 6-aminoindole on gold electrodes in acidic media. Potentiostatic or potential cycling electrooxidation of 6-aminoindole below 0.5 V vs. saturated calomel electrode leads to the formation of multilayer polymeric films, while at higher positive potentials, further oxidation takes place resulting in a different material which remains attached to the metal surface but shows decreased or no redox activity. A mechanism of the redox transformations of poly(6-aminoindole) which involves protonation–deprotonation accompanying the electron transfer is suggested. In this potential range, a yellow-green reversible color change occurs. At higher positive potentials blue-purple, indigo-type compounds are formed, and bond-breaking leads to the decrease of the electroactivity.
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页码:3067 / 3074
页数:7
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