Color-Tunable Solid-State Fluorescence Emission from Carbazole-Based BODIPYs.

Area of Science:

• Organic Chemistry
• Materials Science
• Photophysics

Background:

• Carbazole and boron dipyrromethene (BODIPY) are important chromophores.
• Developing novel fluorescent dyes with tunable solid-state emission is crucial for advanced materials.

Purpose of the Study:

• Synthesize novel carbazole-based BODIPY dyes.
• Investigate the photophysical properties of these dyes, particularly their solid-state fluorescence.
• Explore the effect of substituents on fluorescence characteristics.

Main Methods:

• Organometallic synthesis of carbazole-BODIPY derivatives.
• Characterization using UV/Vis and fluorescence spectroscopy, cyclic voltammetry, and X-ray crystallography.
• Computational analysis using DFT calculations.

Main Results:

• Several carbazole-BODIPY dyes with diverse substituents were successfully synthesized.
• Compounds showed large Stokes shifts and fluorescence in both solution and solid states.
• Carbazole-benzothiazole hybrids exhibited color-tunable solid-state fluorescence, with complex 2a showing high solid-state quantum yield.

Conclusions:

• The synthesized carbazole-BODIPY dyes possess promising photophysical properties for solid-state applications.
• Substituent modification effectively tunes the fluorescence color and intensity.
• Crystal packing analysis correlates with observed fluorescence behavior, enabling rational design of new dyes.