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Updated: Oct 18, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Anion recognition by halogen bonding and hydrogen bonding bis(triazole)-imidazolium [2]rotaxanes
Grace Turner1, Andrew Docker1, Paul D Beer1
1Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, UK. paul.beer@chem.ox.ac.uk.
Abstract:
A novel halogen bonding (XB) bis(iodotriazole)-imidazolium motif is incorporated into the axle component of a [2]rotaxane via a discrete chloride anion template directed clipping methodology. 1H NMR anion titration experiments reveal the interlocked host is capable of strong halide and sulfate oxoanion binding in competitive aqueous-organic CDCl3/CD3OD/D2O (45 : 45 : 10 v/v) solvent mixtures. In comparison to a hydrogen bonding rotaxane analogue, which exhibited no pronounced selectivity between Cl-, I- and SO42-, the axle iodo-triazole donor motifs of the XB rotaxane modulate the anion recognition preference towards the lighter halides Cl- ≈ Br- > SO42- > I-.
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