Unique phenanthrenequinone imidazole-based fluorescent materials with aggregation-induced or two-photon emission

Area of Science:

• Materials Science
• Organic Chemistry
• Photophysics

Background:

• Aggregation-induced emission (AIE) and two-photon (TP) emission materials are gaining prominence due to their diverse applications.
• Developing single fluorophore cores with tunable AIE or TP properties is crucial for advanced optical materials.

Purpose of the Study:

• To design and synthesize a novel phenanthrenequinone imidazole core capable of exhibiting distinct AIE or TP fluorescence properties based on substituent modification.
• To explore the potential of these tailored materials for sensing applications in aqueous and biological environments.

Main Methods:

• Synthesis of phenanthrenequinone imidazole derivatives with electron-donating (tertiary amine) and electron-withdrawing (indolium) groups.
• Optical characterization including studies on AIE and TP emission properties.
• Demonstration of sensing capabilities for target analytes in relevant settings.

Main Results:

• A tertiary amine substituted derivative (PIN) exhibited significant AIE characteristics.
• An indolium substituted derivative (PID) displayed favorable TP emission properties.
• Both AIE and TP materials showed successful application in sensing targets in aqueous and biological media.

Conclusions:

• The phenanthrenequinone imidazole scaffold serves as a versatile platform for engineering materials with either AIE or TP fluorescence.
• Strategic modification of substituents on this core allows for precise control over photophysical properties.
• These findings open new avenues for developing robust, application-specific fluorescent materials.