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A New Bis-Urea Based Cage Receptor for Anions: Synthesis, Solid State Structures and Binding Studies.

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A novel bis-urea cage receptor, L, effectively binds various anions through hydrogen bonding. This new ligand demonstrates stronger affinity for carboxylate anions like acetate and norfloxacin compared to chloride.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Coordination Chemistry

Background:

  • Anion recognition is crucial in biological and chemical processes.
  • Designing synthetic receptors with high affinity and selectivity for anions remains a challenge.

Purpose of the Study:

  • To synthesize and characterize a novel bis-urea-based macro-bicyclic cage receptor (L).
  • To investigate the anion binding properties of L, focusing on interactions with spherical and carboxylate anions.
  • To elucidate the binding modes and stoichiometry of the receptor-anion complexes.

Main Methods:

  • Synthesis of the bis-urea cage receptor (L) based on a tetraazacyclododecane scaffold.
  • Nuclear Magnetic Resonance (NMR) spectroscopy to study receptor-anion interactions.
  • X-ray crystallography to determine the solid-state structures of receptor-anion adducts.

Main Results:

  • The novel cage receptor L was successfully synthesized and characterized.
  • L binds various anions including chloride, acetate, and norfloxacin via hydrogen bonding at the ureido moieties.
  • Complexes with 1:1 and 1:2 stoichiometry were observed for chloride and acetate, while only 1:1 for norfloxacin.
  • Higher formation constants were determined for carboxylate anions ([LAcO]⁻ and [LNor]⁻) compared to chloride ([LCl]⁻).
  • Crystal structures confirmed hydrogen bonding interactions between the receptor's NH groups and the bound anions.

Conclusions:

  • The bis-urea cage receptor L demonstrates effective anion binding capabilities.
  • The receptor exhibits selectivity towards carboxylate anions over chloride.
  • The study provides insights into the design of macrocyclic receptors for anion recognition.