Anion recognition by halogen bonding and hydrogen bonding bis(triazole)-imidazolium [2]rotaxanes. Issue 37 (1st September 2021)

• Record Type: Journal Article
• Authors: Turner, Grace; Docker, Andrew; Beer, Paul D.
• Is Part Of: Dalton transactions. Volume 50:Issue 37(2021)
• Page Start: 12800
• Page End: 12805
• Publication Date: 2021-09-01
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt02414k
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A novel halogen bonding bis(iodotriazole)-imidazolium axle containing [2]rotaxane is capable of strong halide and sulfate binding in highly competitive aqueous–organic solvent mixtures. 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. 1 H NMR anion titration experiments reveal the interlocked host is capable of strong halide and sulfate oxoanion binding in competitive aqueous–organic CDCl3 /CD3 OD/D2 O (45 : 45 : 10 v/v) solvent mixtures. In comparison to a hydrogen bonding rotaxane analogue, which exhibited no pronounced selectivity between Cl −, I − and SO4 2−, the axle iodo-triazole donor motifs of the XB rotaxane modulate the anion recognition preference towards the lighter halides Cl − ≈ Br − > SO4 2− > I − .