A Water-Soluble Leggero Pillar[5]arene.

Area of Science:

• Supramolecular Chemistry
• Molecular Recognition
• Host-Guest Chemistry

Background:

• Aqueous-phase molecular recognition is crucial for understanding biochemical processes.
• Artificial receptors are essential tools for studying interactions in aqueous media.
• Pillararenes are a class of macrocyclic hosts with potential in supramolecular chemistry.

Purpose of the Study:

• To design and synthesize a water-soluble pillararene derivative for aqueous molecular recognition.
• To investigate the binding capabilities of the novel receptor with aliphatic sulfonate guests.
• To compare the performance of the new receptor against existing water-soluble macrocyclic hosts.

Main Methods:

• Synthesis of a water-soluble leggero pillar[5]arene functionalized with eight pyridinium moieties (CWP[5]L).
• Evaluation of binding affinities of CWP[5]L with aliphatic sulfonate species in aqueous solutions.
• Conducting control experiments to compare CWP[5]L with traditional water-soluble macrocyclic receptors.

Main Results:

• Successful design and synthesis of the water-soluble CWP[5]L receptor.
• CWP[5]L demonstrated significant binding affinities for specific aliphatic sulfonate guests in water.
• Control experiments revealed superior guest binding performance of CWP[5]L over conventional water-soluble macrocycles.

Conclusions:

• The novel CWP[5]L receptor effectively facilitates molecular recognition in aqueous environments.
• Positively charged pillararene derivatives show promise as advanced hosts for sulfonate recognition.
• This work advances the development of artificial receptors for applications in aqueous supramolecular chemistry.