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

Mami ONIZAKI; Kotaro MORITA; Naoki HIRAYAMA

doi:10.2116/analsci.32.1367

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

Mami ONIZAKI, Kotaro MORITA, Naoki HIRAYAMA

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Keywords: Synergistic effect, ion-pair extraction, strontium, tri-n-octylphosphine oxide, dicyclohexano-18-crown-6

JOURNAL FREE ACCESS

2016 Volume 32 Issue 12 Pages 1367-1370

DOI https://doi.org/10.2116/analsci.32.1367

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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^–.

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