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Cited by 0Supramolecular Chemistry and ComplexesIonic liquids properties and applicationsMolecular Sensors and Ion Detection

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Counter-Anion Tuning of Aqueous Carboxylate Recognition by Imidazolium Poly(Ionic Liquids)

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Shinde, Sudhirkumar, McClure, Andrew, Manesiotis, Panagiotis·2026·ACS Applied Polymer Materials
DOI 10.1021/acsapm.6c01428
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Abstract

Achieving strong and general anion recognition in pure water remains a major unresolved challenge in supramolecular chemistry due to intense competitive solvation. Here we demonstrate that counteranion identity can be used as a tunable design element to control aqueous carboxylate binding in poly(ionic liquid) receptors. A benzyl methyl imidazolium polymer scaffold was prepared and systematically converted into Cl–, Br–, I–, PF6–, NTf2–, TFA–, and Ac– forms, enabling direct evaluation of counteranion effects under identical structural conditions. The acetate-functionalized polymer displays markedly enhanced binding affinity and capacity in 90 to 100% water, with apparent association constants spanning 103–106 M–1 across structurally diverse carboxylates. Spectroscopic analysis (1H and 19F NMR) and quantitative ion-release assays establish a stoichiometric counterion displacement mechanism that drives analyte capture. Benchmarking against pyridine-, pyridinium-, and trimethylammonium-based analogues confirms that imidazolium–acetate pairing uniquely amplifies aqueous binding performance. These results identify counteranion tuning as a powerful and generalizable strategy for engineering high-affinity polymeric receptors for polar analytes in water.

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Metadata

Authors
Shinde, S., McClure, A., & Manesiotis, P.
Affiliations
Queen's University Belfast (GB)
Corresponding author
  • Shinde, Sudhirkumar
  • Manesiotis, Panagiotis
ORCID
Venue
ACS Applied Polymer Materials
Publisher
American Chemical Society (ACS)
Published
2026-08-19
Volume
8
Issue
16
Pages
13651-13661
ISSN
2637-6105 (ISSN-L)
DOI
10.1021/acsapm.6c01428
OpenAlex
W7203795970
Cited by
0
References
1
FWCI
0.00
Type
journal article
Language
en
Open access
Licence
Locations
  • ACS Applied Polymer Materials (publishedVersion, cc-by)
  • Research Portal (Queen's University Belfast) (acceptedVersion, cc-by)
Funders
Invest Northern Ireland (11-12-17-005)
Topics
  • Physical Sciences › Chemistry › Organic Chemistry › Supramolecular Chemistry and Complexes
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Ionic liquids properties and applications
  • Physical Sciences › Chemistry › Spectroscopy › Molecular Sensors and Ion Detection
Keywords
imidazolium polymers, poly(ionic liquids), acetate binding, supramolecular receptors, anion recognition

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