α,β-Diarylation on β-Diketo-BF₂ Complexes: Strong Intrinsic Aggregation-Induced Emission and Organic Self-Recovering...

Area of Science:

• Organic Synthesis
• Materials Science
• Photochemistry

Background:

• Aggregation-induced emission (AIE) is a phenomenon where molecules exhibit enhanced fluorescence in aggregated states.
• Boron-difluoride (BF2) complexes are versatile building blocks in organic electronics and optoelectronics.

Purpose of the Study:

• To develop a novel synthetic route for α,β-diaryl β-diketone-BF2 complexes.
• To explore the photophysical and electrochromic properties of these novel complexes and their π-extended derivatives.

Main Methods:

• One-step synthesis of α,β-diaryl β-diketone-BF2 complexes from 1,2-diarylethanones.
• Knoevenagel condensation to create π-extended derivatives.
• Spectroscopic analysis (fluorescence emission, quantum yield) and electrochemical studies (electrochromism).

Main Results:

• Successful synthesis of α,β-diaryl β-diketone-BF2 complexes (2a-2g) and π-extended derivatives (3a-3c).
• Exhibited strong intrinsic aggregation-induced emission (AIE) with tunable colors from cyan to red (470-652 nm).
• Achieved high fluorescence quantum yields up to 90% and demonstrated electrochromism with a color change to purple at -1.3 V.

Conclusions:

• The developed synthetic strategy provides efficient access to novel BF2 complexes with tunable AIE properties.
• These complexes show potential for applications in optoelectronic devices due to their strong fluorescence and electrochromic behavior.