Synergistic Ion-pair Extraction of Strontium Ion with Tri-<i>n</i>-octylphosphine Oxide and Dicyclohexano-18-crown-6

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  • ONIZAKI Mami
    Department of Chemistry, Faculty of Science, Toho University
  • MORITA Kotaro
    Department of Chemistry, Faculty of Science, Toho University
  • HIRAYAMA Naoki
    Department of Chemistry, Faculty of Science, Toho University Research Center for Materials with Integrated Properties, Toho University

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  • Synergistic Ion-pair Extraction of Strontium Ion with Tri-n-octylphosphine Oxide and Dicyclohexano-18-crown-6

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Abstract

The co-use of two neutral ligands, tri-n-octylphosphine oxide (TOPO) and dicyclohexano-18-crown-6 (DC18C6), for ion-pair extraction of divalent strontium (Sr2+) with bis(trifluoromethanesulfonyl)imide anion (Tf2N–) showed unique synergistic effect. The extracted species in use of a single ligand is Sr(TOPO)32+·2Tf2N– or Sr(DC18C6)2+·2Tf2N–, whereas the co-use resulted in extraction enhancement based on additional formation of Sr(DC18C6)(TOPO)2+·2Tf2N– and Sr(DC18C6)(TOPO)22+·2Tf2N–.

Journal

  • Analytical Sciences

    Analytical Sciences 32 (12), 1367-1370, 2016

    The Japan Society for Analytical Chemistry

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