Cyclic voltammetric and computational study of a 4-bromophenyl monolayer on a glassy carbon electrode |
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Authors: | Maryam Khoshroo Abbas A Rostami Saeed Yeganegi |
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Institution: | (1) Department of Chemistry, Faculty Basic of Science, University of Mazandaran, Babolsar, Iran |
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Abstract: | A glassy carbon (GC) surface modified with monolayer of 4-bromophenyl was examined as voltammetric electrode for some redox
systems. The modified electrode exhibited very slow electron transfer in comparison to the unmodified surface by factors which
varied with the redox systems. However, after scanning the modified electrode in 0.1 M tetrabutylammonium tetrafluoroborate (TBABF4) in acetonitrile from 0.4 to −1.1 V vs. Ag/AgCl for 20–25 cycles, the modified electrode showed much faster electron transfer kinetics, e.g., the results for Fe(CN)6
3−/4− were approaching those observed with unmodified surfaces. The effect is attributed to an apparently irreversible structural
change in the 4-bromophenyl monolayer, which increases the rate of electron tunneling. The transition to the conducting state
is associated with electron injection into the monolayer and causes a significant decrease in the calculated HOMO-LUMO gap
for the monolayer molecule. Once the monolayer is switched to the conducting state, it supports rapid electron exchange with
the redox system, but not with dopamine, which requires adsorption to the electrode surface. A conductive surface modified
electrode may have useful properties for electroanalytical applications and possibly in electrocatalysis.
Correspondence: Abbas A. Rostami, Department of Chemistry, Faculty Basic of Science, University of Mazandaran, Babolsar, Iran. |
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Keywords: | Cyclic voltammetry Computational study 4-Bromophenyl Glassy carbon |
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