Double alkylene-strapped diphenylanthracene as a photostable and intense solid-state blue-emitting material

Area of Science:

• Organic Chemistry
• Photochemistry
• Materials Science

Background:

• 9,10-diphenylanthracene (DPA) is a fluorescent molecule susceptible to photochemical degradation.
• Protecting the reactive anthracene core is crucial for enhancing molecular stability and photophysical performance.

Purpose of the Study:

• To synthesize and characterize novel double alkylene-strapped 9,10-diphenylanthracene derivatives.
• To investigate the impact of alkylene strap length on photochemical stability and photophysical properties, particularly fluorescence quantum yield.

Main Methods:

• Synthesis of double alkylene-strapped DPA derivatives (3a-c) with varying strap lengths (C6, C7, C8).
• Photochemical stability testing of derivatives compared to parent DPA and a silyl-protected DPA.
• Photophysical characterization, including fluorescence quantum yield measurements in solution, film, and powder states.

Main Results:

• The synthesized derivatives (3a-c) demonstrated significantly improved resistance to photochemical reactions compared to DPA.
• Derivative 3b, featuring a C7 strap, exhibited the highest fluorescence quantum yields across different states (solution, film, powder).
• The C7 strap in 3b was identified as effective in preventing fluorescence self-quenching, a common issue in DPA derivatives.

Conclusions:

• Double alkylene-strapping provides an effective strategy for enhancing the photochemical stability of DPA derivatives.
• The C7-strapped derivative (3b) offers superior fluorescence properties due to the suppression of self-quenching, making it a promising candidate for applications requiring high photostability and emission efficiency.