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This study shows how cetyl-2-methylresorcinarene and pyridine form ternary assemblies with carboxylic acids. These molecular recognition systems can be used to develop specific sensors for carboxylic acids.

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Area of Science:

  • Supramolecular Chemistry
  • Molecular Recognition
  • Chemical Sensing

Background:

  • Resorcinarene derivatives and pyridine are known host molecules.
  • Carboxylic acids are common organic compounds with varying acidities.
  • Ternary molecular assemblies offer unique properties for host-guest chemistry.

Purpose of the Study:

  • To investigate the formation and properties of ternary assemblies involving cetyl-2-methylresorcinarene, pyridine, and carboxylic acids.
  • To explore the role of guest molecules in mediating complex formation.
  • To understand the influence of carboxylic acid pKa on assembly stability and to assess the potential for sensor development.

Main Methods:

  • Experimental techniques (e.g., NMR, titration) to characterize the assemblies.
  • Computational methods (e.g., DFT calculations) to model interactions.
  • Varying carboxylic acid guests with different pKa values.

Main Results:

  • Formation of 1:1:1 ternary assemblies (A·B·C) driven by multiple noncovalent interactions.
  • Complex stability is influenced by the pKa of the carboxylic acid guests.
  • Positive cooperativity observed, where interactions between A and C reinforce A-B interactions.
  • Assemblies remain stable in methanol, a competitive hydrogen-bonding solvent.

Conclusions:

  • Ternary systems involving resorcinarene, pyridine, and carboxylic acids are effective molecular assemblies.
  • The pKa of carboxylic acids is a critical factor in the recognition process.
  • The A·B two-component system shows promise for developing sensors for molecular recognition of carboxylic acids.