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  • Title: Chalcogen Bonding Ion-Pair Cryptand Host Discrimination of Potassium Halide Salts.
    Author: Docker A, Bunchuay T, Ahrens M, Martinez-Martinez AJ, Beer PD.
    Journal: Chemistry; 2021 May 20; 27(29):7837-7841. PubMed ID: 33770417.
    Abstract:
    A series of chalcogen, halogen and hydrogen bonding heteroditopic macrobicyclic cryptands are reported and their potassium halide ion-pair recognition properties investigated. Saliently, the co-bound potassium cation was determined to be crucial in switching on the bromide and iodide recognition properties of the respective cryptand receptor. Importantly, the nature of the sigma-hole mediated interaction employed in the anion recognition component is demonstrated to significantly augment the ion-pair binding behaviour, markedly so for the halogen bonding analogue. Most notably the incorporation of a chelating chalcogen bonding donor motif significantly improves the selectivity towards KBr over KI, relative to halogen and hydrogen bonding analogues.
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