Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 27, Issue 59, Pages 14600-14604Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202102952
Keywords
Halogen bonding; Ion-pair recognition; Sigma-hole interactions; Solid-liquid extraction
Categories
Funding
- EPSRC [EP/N509711/1]
- Johnson Matthey
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A series of novel heteroditopic halogen bonding (XB) receptor functionalised silica-based materials are investigated for extracting sodium halide ion-pair species from aqueous solution. Cooperative XB-mediated sodium halide ion-pair binding is crucial to the material's extraction capabilities, showing a two-fold enhancement in sodium iodide extraction efficiency compared to other functionalised silica materials.
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, C-13 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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