Halogen Bonding Heteroditopic Materials for Cooperative Sodium Iodide Binding and Extraction |
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| Authors: | Andrew Docker Dr. James G. Stevens Prof. Paul D. Beer |
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| Affiliation: | 1. Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA;2. Johnson Matthey, Blount's Court, Sonning Common, Reading, RG4 9NH UK |
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| Abstract: | A series of novel heteroditopic halogen bonding (XB) receptor functionalised silica based materials, containing mono- and bis-iodotriazole benzo-15-crown-5 groups are investigated for the cooperative binding and extraction of sodium halide ion-pair species from aqueous solution. Characterisation of the XB materials by CHN elemental analysis, 13C CP/MAS NMR and ATR-FTIR spectroscopies confirms and quantifies the successful incorporation of the ion-pair receptor frameworks to the silica material. ICP-MS solid-liquid extraction studies demonstrate the bidentate XB functionalised material is capable of NaI extraction from water. Importantly, cooperative XB-mediated sodium halide ion-pair binding is determined to be crucial to the material's extraction capabilities, impressively demonstrating a two-fold enhancement in sodium iodide extraction efficiency relative to a heteroditopic hydrogen bonding receptor functionalised silica material analogue. |
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| Keywords: | Halogen bonding Ion-pair recognition Sigma-hole interactions Solid-liquid extraction |
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