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Potential-Dependent Adsorption of Transferring Ions Having Asymmetric Charge Distribution at the 1,2-Dichloroethane|Water Interface and Its Ion-Transfer Kinetics Studied by AC-modulated Voltfluorometry

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Abstract

The kinetics of the transfer of Erythrosine B dianions (EB2–) and Eosin Y dianions (EY2–) across the 1,2-dichloroethane|water interface, studied using ac-modulated voltfluorometry, is compared with that of Rose Bengal dianions (RB2–). All three exhibit anomalous phase angles, showing the transient adsorption of these ions at the interface. The apparent standard rate constants are 9.0 × 10–3 and 1.3 × 10–2 cm s–1 for EY2– and EB2– at 25°С (cp. 1.4 × 10–2 cm s–1 for RB2–). The slight decrease in the rate in the order RB2–, EB2–, and EY2– may be associated with the increasing polarity of the ions, which endows the ions with a stronger interaction with water, resulting in the slower rotational dynamics of the ions on crossing the interface.

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Authors and Affiliations

  1. Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, 606-8501, Japan

    N. Nishi & T. Kakiuchi

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  1. N. Nishi
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  2. T. Kakiuchi
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Nishi, N., Kakiuchi, T. Potential-Dependent Adsorption of Transferring Ions Having Asymmetric Charge Distribution at the 1,2-Dichloroethane|Water Interface and Its Ion-Transfer Kinetics Studied by AC-modulated Voltfluorometry. Russian Journal of Electrochemistry 39, 125–129 (2003). https://doi.org/10.1023/A:1022396522597

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