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Cyclic voltammetric and computational study of a 4-bromophenyl monolayer on a glassy carbon electrode

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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.

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Authors and Affiliations

  1. Department of Chemistry, Faculty Basic of Science, University of Mazandaran, Babolsar, Iran

    Maryam Khoshroo, Abbas A. Rostami & Saeed Yeganegi

Authors
  1. Maryam Khoshroo
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  2. Abbas A. Rostami
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  3. Saeed Yeganegi
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Correspondence to Abbas A. Rostami.

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Correspondence: Abbas A. Rostami, Department of Chemistry, Faculty Basic of Science, University of Mazandaran, Babolsar, Iran.

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Khoshroo, M., Rostami, A. & Yeganegi, S. Cyclic voltammetric and computational study of a 4-bromophenyl monolayer on a glassy carbon electrode. Monatsh Chem 139, 781–787 (2008). https://doi.org/10.1007/s00706-007-0851-2

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  • DOI: https://doi.org/10.1007/s00706-007-0851-2

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