Engineering function of mechanically interlocked molecules with pyrrole-based macrocyclic platforms

Area of Science:

• Supramolecular Chemistry
• Organic Chemistry
• Materials Science

Background:

• Mechanically interlocked molecules (MIMs) offer unique properties due to their topology.
• Porphyrins and porphyrinoids are versatile macrocycles with diverse applications.

Purpose of the Study:

• To review advances in porphyrin-based MIMs.
• To showcase the integration of porphyrinoids into interlocked architectures for specific functions.
• To present novel self-assembly methodologies and functional systems.

Main Methods:

• Review of existing literature on porphyrin-containing catenanes and rotaxanes.
• Description of self-assembly strategies for complex MIMs.
• Synthesis and characterization of new porphyrinoid-based MIMs.

Main Results:

• Porphyrin-based MIMs enable functions like energy transfer, catalysis, and molecular recognition.
• A novel iminopyrrole-based self-assembly methodology has been developed.
• Complex structures including 2D macrocycles, capsular assemblies, and metal-stabilized MIMs were constructed.
• Rotaxanes and catenanes with calix[4]phyrins exhibiting 'fluttering' motion were synthesized.

Conclusions:

• Porphyrin-based MIMs are a rapidly advancing field with significant functional potential.
• Engineered porphyrinoid stations allow for precise control over MIM properties and dynamics.
• New synthetic strategies are expanding the complexity and functionality of these molecular architectures.