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Updated: Jun 28, 2025
14:11
Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
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Synthesis and Application of Specific N2H4 Fluorescent Probes with AIE Effect Based on Pyrazole Structure
Yun-Shang Yang1, Zhen Zhang2, Ying-Peng Zhang3
1School of Petrochemical Engineering & Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu, Lanzhou University of Technology, Lanzhou, 730050, China. yangyunshang@tom.com.
Journal of Fluorescence
|April 19, 2024
Summary
New fluorescent probes (Y1-2) efficiently detect hydrazine (N2H4) with high selectivity and sensitivity. These probes are suitable for live cell imaging at physiological pH.
Area of Science:
- Organic synthesis
- Analytical chemistry
- Biophysical chemistry
Background:
- Hydrazine (N2H4) is a toxic compound requiring sensitive detection methods.
- Fluorescent probes offer advantages for detecting analytes in biological systems.
Purpose of the Study:
- To synthesize novel fluorescent probes (Y1-2) for hydrazine detection.
- To evaluate the probes' recognition efficacy, selectivity, and sensitivity towards hydrazine.
- To assess the probes' applicability in live cell imaging.
Main Methods:
- Synthesis of probes Y1-2 via Vilsmeier-Haack reaction and Knoevenagel condensation.
- Spectroscopic analysis (UV-visible absorption and fluorescence emission) for recognition studies.
- Density-functional theory calculations to elucidate the recognition mechanism.
- pH-dependent studies and live cell imaging experiments.
Main Results:
- Probes Y1-2 were successfully synthesized.
- High selectivity and low detection limit for hydrazine were achieved.
- Recognition of hydrazine is effective at physiological pH.
- Probes exhibit aggregation-induced luminescence, large Stokes shift, and high sensitivity.
- Successful application in live cell imaging was demonstrated.
Conclusions:
- The developed fluorescent probes (Y1-2) provide a sensitive and selective method for hydrazine detection.
- The probes are suitable for biological applications, including live cell imaging, due to their performance at physiological pH.
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