Annulated oxazolium anion-π⁺ AIEgens

Area of Science:

• Organic Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Aggregation-induced emission (AIE) materials offer unique photophysical properties.
• Anion-π⁺ interactions are increasingly recognized for their role in molecular assembly and function.

Purpose of the Study:

• To report a new class of anion-π⁺-based AIEgens.
• To investigate the synthesis and structure-property relationships of these novel compounds.

Main Methods:

• Synthesis of ring-fused annulated oxazolium architectures.
• Utilizing a single-step dual C-H activation annulative π-extension (APEX) protocol.
• Analysis of solid-state structural arrangements and anion-π⁺ interactions.

Main Results:

• Successful synthesis of a new class of anion-π⁺ AIEgens via the APEX protocol.
• Demonstration of the crucial role of anion-π⁺ interactions in solid-state packing.
• Correlation between anion-π⁺ interactions, tunable AIE characteristics, and solid-state quantum yields.

Conclusions:

• A facile synthetic route to novel oxazolium-based AIEgens has been established.
• Anion-π⁺ interactions are key determinants of the solid-state properties and AIE behavior of these materials.
• The findings provide insights into the rational design of advanced functional organic materials.