Pillararene-based supramolecular polymers: from molecular recognition to polymeric aggregates

Area of Science:

• Supramolecular Chemistry
• Polymer Science
• Organic Chemistry

Background:

• Pillar[n]arenes (P[n]As) are cyclophane hosts developed in 2008.
• They possess unique properties like facile synthesis, tunable modification, rigid cavities, and notable guest complexation abilities.
• These characteristics make P[n]As excellent building blocks for supramolecular polymers.

Purpose of the Study:

• To provide an overview of pillararene-based supramolecular polymer construction.
• To highlight recent research on integrating P[n]As with polymeric aggregates via host-guest interactions.
• To classify and discuss these polymers based on guest recognition types.

Main Methods:

• Classification of supramolecular polymers based on P[n]As into two categories: cationic and neutral guest recognition.
• Comprehensive discussion of host-guest motifs, fabrication strategies, and topological architectures.
• Analysis of stimuli-responsiveness and functionalities of the resulting polymers.

Main Results:

• P[n]As enable the construction of supramolecular polymers through host-guest complexation.
• Two main classes of P[n]As-based supramolecular polymers were identified: those utilizing cationic guest recognition and those using neutral guest recognition.
• The study details various design strategies, architectures, and functional properties.

Conclusions:

• Pillararene-based supramolecular polymers represent a significant advancement in materials science.
• The flexible nature of P[n]As allows for diverse applications and tailored functionalities.
• Further research in this area promises novel materials with tunable properties.