Transpositional Circularly Polarized Luminescence from Transient Charge-Transfer Coassembly

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Organic Electronics

Background:

• Charge-transfer (CT) complexation is vital for optical and photovoltaic materials.
• Dynamic CT coassemblies offer potential for smart luminescent materials but remain underexplored.

Purpose of the Study:

• To investigate transient CT-driven coassembly between π-conjugated amino acids and tetracyanobenzene.
• To explore the resulting dynamic luminescent transitions and circularly polarized luminescence (CPL) properties.

Main Methods:

• Utilized π-conjugated amino acids (fluorene, naphthalene, anthracene) and tetracyanobenzene for CT complexation.
• Incorporated fluorescent dyes and competitive CT donors to modulate luminescence and CPL.
• Immobilized CT coassemblies within polymeric matrices for stable CPL emission.

Main Results:

• Demonstrated transient CT coassembly independent of binding site, driven by intramolecular CH…π interactions.
• Achieved tunable CPL properties, including hyperchromic effects and spontaneous green-to-red transitions in hydrogels.
• Fabricated immobilized CT coassemblies with diverse CPL outputs in polymeric matrices.

Conclusions:

• Transient CT coassembly offers a novel route to dynamic, smart luminescent materials.
• The system exhibits potential for moisture-responsive applications and multi-color luminescence evolution.
• This work lays the foundation for designing advanced CPL materials with controllable optical responses.