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The Effect of Adsorption of Ions of the Hexacyanoferrate(II)/(III) Redox Pair on Self-Assembly of Octanethiol at Its Adsorption from Aqueous Solutions on Gold Electrode

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Abstract

The effect of components of the redox pair K3[Fe(CN)6]/K4[Fe(CN)6] on the dynamics of formation of octanethiol (OT) monolayers from aqueous thiol-containing solutions of 0.1 М NaClO4 is studied by cyclic voltammetry (CVA). The formation of OT monolayers is shown to depend on the presence of ions of hexacyanoferrate(II)/(III) in solution. Being added to solution, the components of the [Fe(CN)6]3–/4– redox pair sharply increase the time of formation of the insulating monolayer OT films and make them less stable. The destabilizing and inhibiting action of [Fe(CN)6]3–/4– ions becomes stronger as their concentration in solution increases. The adsorption activity of individual components of the redox pair is assessed. The strong and approximately equal adsorption activity of ions [Fe(CN)6]3– and [Fe(CN)6]4– on gold in the presence of octanethiol is observed. At the same time, OT and the hexacyanoferrate(II)/(III) ions can be placed in the following row: OT > [Fe(CN)6]3– ≈ [Fe(CN)6]4–. Recommendations are given on how to eliminate the interfering action of the K3[Fe(CN)6]/K4[Fe(CN)6] redox-pair ions when studying the insulating properties of thiol monolayers on gold.

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  1. Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630128, Russia

    S. N. Ovchinnikova

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Correspondence to S. N. Ovchinnikova.

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Original Russian Text © S.N. Ovchinnikova, 2017, published in Elektrokhimiya, 2017, Vol. 53, No. 11.

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Ovchinnikova, S.N. The Effect of Adsorption of Ions of the Hexacyanoferrate(II)/(III) Redox Pair on Self-Assembly of Octanethiol at Its Adsorption from Aqueous Solutions on Gold Electrode. Russ J Electrochem 53, 1246–1253 (2017). https://doi.org/10.1134/S1023193517110106

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  • DOI: https://doi.org/10.1134/S1023193517110106

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