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Updated: May 11, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
Boron-phenylpyrrin dyes: facile synthesis, structure, and pH-sensitive properties
Yuting Chen1, Dongdong Qi, Luyang Zhao
1Beijing Key Laboratory for Science and Application of Functional, Molecular and Crystalline Materials, Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
New boron-phenylpyrrin dyes were synthesized. These compounds, containing a central boron ring, show a color change and spectral shifts in acidic conditions, making them potential pH sensors.
Area of Science:
- Organic Chemistry
- Materials Science
- Spectroscopy
Background:
- Boron-dipyrrin dyes are known fluorescent compounds.
- Development of novel dyes with tunable properties is ongoing.
- pH sensors are crucial for various chemical and biological applications.
Purpose of the Study:
- To synthesize and characterize novel boron-phenylpyrrin dyes.
- To investigate the photophysical properties of these dyes.
- To explore their potential application as pH sensors.
Main Methods:
- Reaction of 4-(diethylamino)salicylaldehyde with substituted pyrroles in the presence of BF3⋅OEt2.
- Spectroscopic analysis (UV-Vis absorption and fluorescence emission) under varying pH conditions.
- Characterization of the central boron-containing seven-membered ring structure.
Main Results:
- Successful synthesis of boron-phenylpyrrin dyes.
- Observation of a significant color change and a large Stokes shift upon protonation in acidic solutions.
- Demonstration of a unique red shift in both absorption and fluorescence emission spectra.
Conclusions:
- Boron-phenylpyrrin dyes represent a new class of boron-containing dyes.
- These dyes exhibit pH-dependent spectral changes, indicating their utility as pH sensors.
- The findings expand the scope of boron-dipyrrin analogues for sensing applications.
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