Persistently folded circular aromatic amide pentamers containing modularly tunable cation-binding cavities with high...

Area of Science:

• Supramolecular Chemistry
• Materials Science

Background:

• Designing molecules with precisely controlled internal environments is crucial for applications like selective ion recognition.
• Aromatic pentamers offer a versatile scaffold for creating complex molecular architectures.

Purpose of the Study:

• To develop a novel design strategy for creating shape-persistent aromatic pentamers with tunable interior properties.
• To investigate the relationship between the tunable structural features and ion-binding affinities.

Main Methods:

• Synthesis of novel shape-persistent aromatic pentamers.
• Systematic tuning of interior properties (cavity size, steric crowdedness, hydrophobicity) below 3 Å.
• Experimental determination of ion-binding affinities for alkali metal cations (Li+, Na+, K+, Rb+, Cs+).
• X-ray crystallography and computational modeling to elucidate binding interactions.

Main Results:

• Demonstrated systematic tunability of interior properties in aromatic pentamers.
• Achieved selective and differential binding affinities for various alkali metal ions.
• Obtained metal-containing crystal structures confirming binding interactions.
• Computational modeling supported experimental findings on binding preferences.

Conclusions:

• The novel design strategy enables precise control over molecular interior properties.
• Aromatic pentamers can be engineered for selective ion binding applications.
• The findings provide a foundation for developing advanced materials for ion separation and sensing.