Affiliation:
1. Department of Chemistry University of Oxford Chemistry Research Laboratory 12 Mansfield Road Oxford OX1 3TA UK
2. CBR Division DSTL Porton Down Salisbury SP4 0JQ UK
Abstract
AbstractThe anion recognition and electrochemical anion‐sensing properties of halogen‐bonding (XB) tripodal zinc(II) receptors strategically designed and constructed for tetrahedral anion guest binding are described. The XB tris(iodotriazole)‐containing hosts exhibit high affinities and selectivities for inorganic phosphate over other more basic, mono‐charged oxoanions such as acetate and the halides in a competitive CD3CN/D2O (9 : 1 v/v) aqueous solvent mixture. 1H NMR anion binding and electrochemical voltammetric anion sensing studies with redox‐active ferrocene functionalised metallo‐tripodal receptor analogues, reveal each of the XB tripods as superior anion complexants when compared to their tris(prototriazole)‐containing, hydrogen bonding (HB) counterparts, not only exemplifying the halogen bond as a strong alternative interaction to the traditional hydrogen bond for molecular recognition but also providing rare evidence of the ability of XB receptors to preferentially bind the “harder” phosphate oxoanion over the “softer” and less hydrated halides in aqueous containing media.
Funder
Defence Science and Technology Laboratory
Subject
General Chemistry,Catalysis,Organic Chemistry
Cited by
3 articles.
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