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Gibbs Transfer Energies of Ions from a Mixed Solvent of 2H,3H-Decafluoropentane and 1,2-Dichloroethane to Water

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Abstract

The transfer of hydrophilic, lipophilic, and fluorophilic ions at the interface between water (W) and a mixed solvent (MIX) of 2H,3H-decafluoropentane (DFP) and 1,2-dichloroethane (DCE) was studied voltammetrically and potentiometrically, and the formal Gibbs transfer energies of the ions from MIX to W, ΔG0′tr, MIX→W, were determined. The ΔG0′tr,MIX→W values of all the ions tested were higher than those from DFP to W. Namely, the ions would exist more stably in MIX than DFP, even for fluorophilic ions. This is due to the addition of DCE, which has a higher dielectric constant. A comparison of ΔG0′tr,MIX→W with that from DCE to W showed a superior affinity of fluorophilic ions to the fluorous solvent in spite of equivolume addition of DCE. Therefore, the mixed solvent would be a practically superior extraction medium for fluorophilic ions. In practice, the MIX | methylene blue+ (W) system showed higher extractability of a fluorophilic ion C8F17SO3− than the DFP | W and DCE | W systems.

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Authors and Affiliations

  1. Department of Bioscience and Biotechnology, Fukui Prefectural University, Eiheiji, Fukui, 910-1195, Japan

    Hajime Katano, Kohei Uematsu & Yasuhiro Kuroda

  2. Department of Chemistry, Kobe University, Nada, Kobe, 657-8501, Japan

    Toshiyuki Osakai

Authors
  1. Hajime Katano
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  2. Kohei Uematsu
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  3. Yasuhiro Kuroda
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  4. Toshiyuki Osakai
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Correspondence to Hajime Katano.

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Katano, H., Uematsu, K., Kuroda, Y. et al. Gibbs Transfer Energies of Ions from a Mixed Solvent of 2H,3H-Decafluoropentane and 1,2-Dichloroethane to Water. ANAL. SCI. 35, 1031–1035 (2019). https://doi.org/10.2116/analsci.19P119

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  • DOI: https://doi.org/10.2116/analsci.19P119

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