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<p>Ion-transfer reactions at the supported fluorous liquid membrane (SFLM) | water (W) interface were examined using cyclic voltammetry. The SFLM was constructed by impregnating a polytetrafluoroethylene or polyvinylidene fluoride microporous filter with a fluorous solvent, 1<i>H</i>,1<i>H</i>,5<i>H</i>-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether (OFE). Various ions, including tetraphenylarsonium and tetraphenylborate, exhibited nearly reversible voltammetric waves for the ion-transfer reaction at the SFLM | W interface, enabling the determination of formal ion-transfer potentials. The formal Gibbs transfer energies calculated from these potentials were in good agreement with those determined from the conventional OFE | W interface, particularly when the polytetrafluoroethylene membrane was used. This indicates that the fluorophilic property of OFE was maintained in the SFLM. The supported liquid membrane is an effective means of providing a liquid | liquid interface with mechanical stability and ease of handling. Additionally, it enables a marked reduction in the volume of the expensive fluorous solvent required for electrochemical measurements. Therefore, the SFLM system is advantageous for liquid | liquid electrochemical studies and applications using fluorous solvents.</p> Graphical abstract <p></p>

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Ion-transfer voltammetry at a supported fluorous liquid membrane | water interface

  • 期刊论文

  • 发表日期：

    2025年5月23日

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  • Kohei Uematsu,
  • Yusuke Iwai,
  • Yuki Nara,
  • Minato Tanaka,
  • Hajime Katano

摘要

Ion-transfer reactions at the supported fluorous liquid membrane (SFLM) | water (W) interface were examined using cyclic voltammetry. The SFLM was constructed by impregnating a polytetrafluoroethylene or polyvinylidene fluoride microporous filter with a fluorous solvent, 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether (OFE). Various ions, including tetraphenylarsonium and tetraphenylborate, exhibited nearly reversible voltammetric waves for the ion-transfer reaction at the SFLM | W interface, enabling the determination of formal ion-transfer potentials. The formal Gibbs transfer energies calculated from these potentials were in good agreement with those determined from the conventional OFE | W interface, particularly when the polytetrafluoroethylene membrane was used. This indicates that the fluorophilic property of OFE was maintained in the SFLM. The supported liquid membrane is an effective means of providing a liquid | liquid interface with mechanical stability and ease of handling. Additionally, it enables a marked reduction in the volume of the expensive fluorous solvent required for electrochemical measurements. Therefore, the SFLM system is advantageous for liquid | liquid electrochemical studies and applications using fluorous solvents.

Graphical abstract