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Updated: Apr 30, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
Synthesis and spectroscopic properties of novel fluorescent compounds containing bis-pyrazole ring
Tiegang Ren1, Jie Wang, Guihui Li
1Fine Chemistry and Engineering Research Institute, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, People's Republic of China.
Abstract:
A series of pyrazoline derivatives containing pyrazole group were synthesized and characterized by means of (1)H NMR, FT-IR, MS and elemental analysis, and their UV-vis absorption behavior and fluorescent properties were also measured. Moreover, the influence of metal ions on spectral properties of synthetic products was examined with compound A₅ as an example. It has been found that all synthetic pyrazoline derivatives show two remarkable absorption peaks at about 260 and 360 nm and the maximum emission peak at 445-467 nm. Especially, the joined of Co(2+) can quench the fluorescence of compound A₅ obviously.
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