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Urea-Based Imprinted Polymer Hosts with Switchable Anion Preference.

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This study introduces molecularly imprinted polymers (MIPs) with a switchable preference for phosphonate or sulfonate ions, achieved using small molecule modifiers. These advanced receptors offer tunable selectivity for anion recognition in host-guest chemistry.

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Area of Science:

  • Host-guest chemistry
  • Supramolecular chemistry
  • Polymer science

Background:

  • Designing artificial receptors with switchable ion preference is a significant challenge.
  • Molecularly imprinted polymers (MIPs) offer a versatile platform for molecular recognition.

Purpose of the Study:

  • To develop MIPs with an external switchable preference for oxyanions.
  • To investigate the imprinting mechanism and binding characteristics of these novel polymers.

Main Methods:

  • Hydrogen bond-mediated imprinting using a functional host monomer.
  • 1H NMR titrations and 1H-1H NMR NOESY for interaction elucidation.
  • Molecular dynamic simulations and chromatographic studies for mechanistic insights.

Main Results:

  • The MIPs demonstrated selective binding of phenyl phosphonic acid (PPA) and phenyl sulfonic acid (PSA).
  • Switchable chromatographic retentivity for phosphonate versus sulfonate was achieved by altering the modifier's acidity.
  • High-order complex formation and template-induced diad repeats in the polymer backbone were observed.

Conclusions:

  • The developed MIPs exhibit tunable selectivity for oxyanions via an external switch.
  • The study provides mechanistic insights into configurational and conformational imprinting in polymers.
  • This work advances the design of intelligent host-guest systems for anion recognition.