Polyaromatic molecular tubes: from strategic synthesis to host functions.

Area of Science:

• Supramolecular Chemistry
• Organic Chemistry
• Materials Science

Background:

• Crown ethers and cyclodextrins are key supramolecular structures with well-studied inner microenvironments.
• Tubular structures with polyaromatic frameworks were largely unexplored before 2010.
• Polyaromatic rings offer unique photophysical and electrochemical properties for functional nanospaces.

Purpose of the Study:

• To review recent advancements in the synthesis of short tubular molecules with multiple polyaromatic rings (≥3).
• To highlight the diverse applications stemming from these novel polyaromatic tube structures.
• To discuss the unique properties conferred by polyaromatic frameworks in tubular supramolecular systems.

Main Methods:

• Synthesis of tubular molecules incorporating multiple polyaromatic units (e.g., anthracene, pyrene, chrysene, and hexabenzocoronene (HBC)).
• Characterization of photophysical and electrochemical properties of the synthesized polyaromatic tubes.
• Investigation of molecular binding abilities and host-guest interactions.

Main Results:

• Successful synthesis of short tubular molecules featuring multiple polyaromatic rings.
• Demonstration of strong fluorescent emission from these polyaromatic tubes.
• Evidence of selective molecular binding, efficient host-guest energy transfer, and open-closed structural transformations.

Conclusions:

• Polyaromatic tubes represent a promising class of supramolecular structures with significant potential.
• These materials offer unique functionalities for applications in sensing, energy transfer, and responsive systems.
• Further exploration of polyaromatic tubular architectures is warranted for novel supramolecular designs.