Fluorescent and Electroactive Monoalkyl BTD-Based Liquid Crystals with Tunable Self-Assembling and Electronic...

Area of Science:

• Organic Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Benzothiadiazole derivatives are explored for their optical and redox properties.
• Self-assembly in organic molecules is crucial for advanced material design.
• Tailoring molecular structure influences bulk material properties.

Purpose of the Study:

• To synthesize and characterize novel redox-active benzothiadiazole-based luminophores.
• To investigate the impact of specific substituents on molecular self-assembly and mesomorphism.
• To explore the relationship between molecular structure, electronic properties, and supramolecular organization.

Main Methods:

• Synthesis of functionalized benzothiadiazole derivatives.
• Thermal analysis (e.g., Differential Scanning Calorimetry) to identify mesophases.
• Single-crystal X-ray diffraction to elucidate supramolecular structures.
• Spectroscopic techniques to analyze optical properties.
• Electrochemical methods to assess redox behavior.

Main Results:

• A series of rodlike benzothiadiazole luminophores were synthesized, featuring a phenyl-nonyl group and variable p-substituted phenyl rings.
• A single lateral alkyl chain was sufficient to induce nematic and smectic mesophases.
• Single-crystal analysis revealed the significant role of terminal groups in directing supramolecular assembly.
• Modulation of terminal substituents effectively tuned the redox and optical properties.

Conclusions:

• The designed benzothiadiazole derivatives exhibit tunable redox and optical characteristics.
• These molecules demonstrate self-assembly into layered superstructures, driven by terminal group interactions.
• The combination of optoelectronic properties and self-assembly makes these materials promising for optoelectronic applications.