Piperazine bridged resorcinarene cages

Area of Science:

• Supramolecular Chemistry
• Organic Synthesis
• Crystal Engineering

Background:

• Resorcinarene chemistry enables the construction of complex molecular architectures.
• Mannich condensation is a versatile reaction for forming carbon-nitrogen bonds.
• Helical structures offer unique properties for molecular recognition and encapsulation.

Purpose of the Study:

• To synthesize a novel helical cage structure via a one-pot reaction.
• To investigate the self-assembly and structural characteristics of the cage.
• To explore the guest encapsulation capabilities of the helical cage.

Main Methods:

• One-pot Mannich condensation of resorcinarenes with piperazine and formaldehyde.
• High-dilution conditions to promote cage formation.
• Characterization using NMR spectroscopy, ESI mass spectrometry, and single crystal X-ray diffraction.

Main Results:

• Successful synthesis of a covalently linked dimeric resorcinarene helical cage.
• Yields ranging from 20 to 40% achieved.
• Structural confirmation via X-ray diffraction, revealing a cage with adaptable cavity volume.
• Demonstrated encapsulation of small guest molecules.

Conclusions:

• The one-pot Mannich condensation provides an efficient route to complex helical cages.
• The synthesized helical cages exhibit tunable cavity sizes for guest encapsulation.
• These adaptable helical structures hold potential for applications in molecular recognition and host-guest chemistry.