Self-assembling triazolophanes: from croissants through donuts to spherical vesicles

Area of Science:

• Supramolecular Chemistry
• Organic Synthesis
• Materials Science

Background:

• Macrocyclic compounds are key building blocks in supramolecular chemistry.
• Amide and triazole functionalities are known to participate in molecular recognition and self-assembly.
• Controlling self-assembly is crucial for designing novel materials and functions.

Purpose of the Study:

• To synthesize novel macrocyclic compounds incorporating amide and triazole units.
• To investigate the self-assembly behavior of these synthesized compounds.
• To elucidate the hierarchical mechanism governing the self-assembly process.

Main Methods:

• Synthesis of macrocyclic compounds M1-M3 with varying ring sizes.
• Concentration-dependent studies of self-assembled structures.
• Ultramicroscopic and crystallographic analyses to determine assembly mechanisms.

Main Results:

• Successful synthesis of three macrocyclic compounds (M1-M3) containing amide and triazole moieties.
• Observation of diverse self-assembled structures including hemi-toroids, toroids, and vesicles.
• Demonstration of a concentration-dependent self-assembly process.
• Elucidation of a hierarchical self-assembly mechanism through detailed investigations.

Conclusions:

• The synthesized triazolophanes exhibit controllable self-assembly into various supramolecular architectures.
• The study provides insights into the hierarchical self-assembly mechanisms of macrocyclic compounds.
• These findings contribute to the understanding of structure-property relationships in supramolecular chemistry.