Unveiling Adenine H‑bonded Hexads: Hierarchical Self-Assembly for Helical Columnar Functional Materials

Area of Science:

• Supramolecular chemistry
• Materials science
• Organic electronics

Background:

• Adenine nucleobase self-assembly is crucial for biological systems.
• Designing functional organic materials requires understanding molecular self-organization.
• Controlling supramolecular chirality and electronic properties is a key challenge.

Purpose of the Study:

• To report the unusual self-assembly of adenine-based molecules into helical columnar structures.
• To investigate the role of hydrogen bonding in forming adenine hexameric rosettes.
• To explore the potential for controlling supramolecular chirality and semiconductivity through molecular design.

Main Methods:

• Synthesis of adenine-based molecules with triarylamine units.
• Hydrogen bonding analysis and theoretical calculations (geometry optimization, vibrational modes).
• Experimental and simulated X-ray diffraction (XRD) for structural analysis.
• Thin film circular dichroism and space charge-limited current measurements for functionality.

Main Results:

• Formation of unprecedented adenine hexameric rosettes driven by hydrogen bonding.
• Self-assembly into helical columnar structures exhibiting hexagonal columnar liquid crystal phases.
• Demonstration of control over supramolecular chirality and semiconductivity via molecular design.
• Confirmation of hole transport properties in thin films.

Conclusions:

• Adenine-based molecules can form complex, functional helical columnar assemblies.
• Hydrogen bonding is key to the stability of adenine hexads and subsequent self-assembly.
• Tailored molecular design allows for the development of advanced nanostructured materials with tunable properties.