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Ion-Pair Extraction by Use of Liquid Crystals as Extracting Solvent

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Abstract

By using a liquid crystal, 4-cyano-4′-hexylbiphenyl (abbreviated as CHB), as an extracting solvent, the following ion-pair extraction reaction was investigated: (Q•ClO4)o+(Pi-)w⇌ (Q•Pi)o+(ClO4-)w (Q+: cationic species such as Crystal Violet (CV+), Methylene Blue (MB+) and tetrabutylammonium (TBA+); Pi-: picrate anion; subscripts o and w denote organic and aqueous phases, respectively). The above extraction equilibrium was confirmed to hold in the case of a liquid crystal (CHB) solvent as well as in an ordinary solvent (hexylbenzene/cyanobenzene 1:1 mixture for comparison; abbreviated as MIX). The dependence of the extraction constant on the temperature was investigated. Only in the CV+-CHB system, the extraction constant discontinuously changed around a phase transition temperature of CHB (29°C; nematic/liquid). When an MIX solvent was used, such a phenomenon was not observed; the extraction constant gradually increased with an increase in temperature. The effect of the molecular orientation of the extracting solvent is discussed.

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References

  1. K. Toei, Anal Chem., 3, 479 (1987).

    CAS  Google Scholar 

  2. H. Green, Talanta, 20, 139 (1973).

    Article  CAS  Google Scholar 

  3. K. L. Cheng, K. Ueno and T. Imamura, “Handbook of Organic Analytical Reagents”, CRC Press, Boca Raton, 1982.

    Google Scholar 

  4. R. Diamond and J. Bucker, J. Phys. Chem., 69, 1565 (1965).

    Article  Google Scholar 

  5. W. Müller and R. Diamond, J. Phys. Chem., 70, 3469 (1966).

    Article  Google Scholar 

  6. H. Freiser, Anal. Chem., 41, 1354 (1969).

    Article  CAS  Google Scholar 

  7. T. Higuchi, A. Michaels and J. H. Rytting, Anal. Chem., 43, 287 (1971).

    Article  CAS  Google Scholar 

  8. H. M. N. H. Irving and R. H. Al-Jarrah, Anal. Chim, Acta, 63, 79 (1973).

    Article  CAS  Google Scholar 

  9. E. Iwamoto, K. Ito and Y. Yamamoto, J. Phys. Chem., 85, 894 (1981).

    Article  CAS  Google Scholar 

  10. A. Ohki, X-L. Xiao, Y. Fujino and M. Takagi, Anal. Sci., 2, 293 (1986).

    Article  CAS  Google Scholar 

  11. S. Shinkai, K. Torigoe, O. Manabe and T. Kajiyama, J. Am. Chem. Soc., 109, 4458 (1987).

    Article  CAS  Google Scholar 

  12. It was confirmed in several runs that the extraction equilibrium, Eq. (1), exactly occurred

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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Engineering, Kagoshima University, Kagoshima, 890, Japan

    Akira Ohki & Shigeru Maeda

  2. Department of Organic Synthesis, Faculty of Engineering, Kyushu University, Fukuoka, 812, Japan

    Shigeori Takenaka, Kadzuya Tsukada & Makoto Takagi

Authors
  1. Akira Ohki
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  2. Shigeori Takenaka
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  3. Kadzuya Tsukada
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  4. Shigeru Maeda
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  5. Makoto Takagi
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Ohki, A., Takenaka, S., Tsukada, K. et al. Ion-Pair Extraction by Use of Liquid Crystals as Extracting Solvent. ANAL. SCI. 6, 283–286 (1990). https://doi.org/10.2116/analsci.6.283

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  • DOI: https://doi.org/10.2116/analsci.6.283

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