title: Contrasting anion recognition behaviour exhibited by halogen and hydrogen bonding rotaxane hosts.
abstract: A rotaxane host system containing a novel halogen bonding (XB) 5-iodo-1,2,3-triazole functionalised pyridinium motif, within its axle component, has been prepared via a ring closing metathesis reaction, using chloride as a template. Proton NMR titration experiments, in competitive 1 : 1 CDCl3-CD3OD solvent media, showed the XB rotaxane selectively bound halides over larger, more basic oxoanions. An all hydrogen bonding proto-triazole containing rotaxane analogue was also prepared, which in stark contrast demonstrated a reversal in the anion selectivity trend, with a preference for dihydrogen phosphate over the halides which is unprecedented for an interlocked host system.
authors.affiliation: Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK. paul.beer@chem.ox.ac.uk.
authors.forename: Stuart P
authors.initials: SP
authors.lastname: Cornes
authors.forename: Charles H
authors.initials: CH
authors.lastname: Davies
authors.forename: David
authors.initials: D
authors.lastname: Blyghton
authors.forename: Mark R
authors.initials: MR
authors.lastname: Sambrook
authors.forename: Paul D
authors.initials: PD
authors.lastname: Beer