A new red fluorophore with aggregation enhanced emission by an unexpected "One-step" protocol

Area of Science:

• Materials Science
• Organic Chemistry
• Photophysics

Background:

• Triphenylamine and benzothiadiazole are common building blocks for organic electronic materials.
• Developing efficient red-emitting fluorophores is crucial for advanced imaging applications.
• Aggregation-induced emission (AIE) offers unique advantages for solid-state and biological applications.

Purpose of the Study:

• To synthesize a new triphenylamine-benzothiadiazole-based fluorophore.
• To investigate its photophysical properties, including solid-state emission and AIE behavior.
• To evaluate its potential for bioimaging applications.

Main Methods:

• Facile "one-step" synthesis protocol.
• Spectroscopic analysis (UV-Vis absorption, fluorescence emission).
• Quantum yield determination.
• Aggregation-induced emission studies in THF-H2O mixtures.
• Nanoparticle formation and characterization.
• Cellular imaging experiments.

Main Results:

• A new triphenylamine-benzothiadiazole fluorophore (A1H2) was successfully synthesized.
• A1H2 exhibits bright red emission in the solid state with a high absolute quantum yield of 44.5%.
• Aggregation-induced emission enhancement was observed with increasing water fraction.
• A1H2 nanoparticles demonstrated good stability and biocompatibility.
• Successful application in cellular cytoplasm imaging.

Conclusions:

• The facile synthesis provides an efficient route to novel red-emitting fluorophores.
• A1H2 is a promising material for solid-state emitters and AIE-based applications.
• The biocompatibility and imaging capabilities of A1H2 nanoparticles highlight their potential in biological sciences.