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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 ionpair 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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Acknowledgments

This study was financially supported in part by JSPS KAKENHI Grant No. JP26410162 from the Japan Society for the Promotion of Science, and MEXT-Supported Program for the Strategic Research Foundation at Private Universities (2012–2016) from the Ministry of Education, Culture, Sports, Science and Technology, Japan. The corresponding author (N. H.) thanks S. Akashi for his contribution to some experiments that triggered this study

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi, 274-8510, Japan

    Mami Onizaki, Kotaro Morita & Naoki Hirayama

  2. Research Center for Materials with Integrated Properties, Toho University, 2-2-1 Miyama, Funabashi, 274-8510, Japan

    Naoki Hirayama

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  1. Mami Onizaki
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  2. Kotaro Morita
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  3. Naoki Hirayama
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Correspondence to Naoki Hirayama.

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Onizaki, M., Morita, K. & Hirayama, N. Synergistic Ion-pair Extraction of Strontium Ion with Tri-n-octylphosphine Oxide and Dicyclohexano-18-crown-6. ANAL. SCI. 32, 1367–1370 (2016). https://doi.org/10.2116/analsci.32.1367

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

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