Design Strategies for Compact Photoluminescent Liquid Crystals Based on Fluorinated Tolane Frameworks

Area of Science:

• Materials Science
• Organic Chemistry
• Supramolecular Chemistry

Background:

• Fluorinated tolane derivatives provide rigid, compact π-conjugated systems.
• These molecules allow precise modulation of electronic structure and intermolecular interactions.
• They are promising for integrating liquid crystallinity and photoluminescence.

Purpose of the Study:

• To establish molecular design strategies for compact fluorinated tolane-based photoluminescent liquid crystals (PLLCs).
• To focus on controlling molecular aggregation in crystalline and liquid-crystalline phases.
• To elucidate the roles of structural features in mesophase stability and solid-state emission.

Main Methods:

• Molecular dimerization to reduce crystallinity and induce mesomorphism.
• Partial fluorination with semifluoroalkoxy chains to tune electronic properties and aggregation.
• Ionic functionalization with imidazolium termini for dynamic layered order and anion control.

Main Results:

• Demonstrated hierarchical control of molecular order in π-conjugated systems.
• Achieved reconciliation of mesomorphic behavior and efficient emission.
• Elucidated the influence of fluorination, spacer length, flexible chains, and ionic interactions.

Conclusions:

• Developed design principles for responsive emissive soft materials.
• Showcased the integration of mesomorphic order and photoluminescence in compact systems.
• Highlighted the importance of molecular design for controlling aggregation and properties.