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Updated: Jun 4, 2025
Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
A fluorescent probe based on pyrazoline with significant Stokes shifts for the detection of Cu2+ ions and its
Yajing Shang1, Xinghu Wu1, Haoting Luo1
1School of Chemistry and Chemical Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China. shangyaj@mail.lzjtu.cn.
Abstract:
A simple pyrazoline derivative BBD has been synthesized for detecting Cu2+ in EtOH/HEPES (v/v = 1 : 1, pH = 7). The probe has high selectivity for Cu2+ by quenching the fluorescence intensity and was sensitive to pH. When excited at 398 nm, fluorescence is emitted at 520 nm with a Stokes shift of 122 nm, which is larger than that of other reported pyrazoline skeleton probes. The detection limit (LOD) of the probe for Cu2+ is 0.862 μM which is lower than the value of the WHO limit (31.5 μM) in water. The 2 : 1 binding mode and probable recognition mechanism of the probe with Cu2+ were confirmed by Job's plot, IR, ESI-MS, and TD-DFT analysis. Moreover, the probe has been successfully applied to actual water samples as well as cell and zebrafish imaging.
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