Synthesis and Application of Two Kinds of Bis-pyrazoline Fluorescent Probes
Two kinds of fluorescent probes Z1-2 with bis-pyrazoline structure are synthesized by aldol reaction of m-phthalaldehyde,o-hydroxy-acetophenone and o-hydroxynaphthalene ethyl ketone.Their ability to recognize metal ions is tested by UV-vis absorption spectra and fluorescence e-mission spectra.The complexation mechanism,density functional theory calculation and cytotoxicity of the two kinds of compound are investigated,as well as the effect of pH value on the ion recognition.The results show that the probe Z1-2 has high selectivity for Cu2+and Fe3+and low detection limit,the complexation constants of Z1 for Fe3+and Cu2+are 1.6×10-4 mol and 1.9×10-5 mol respectively.The complexation constants of Z2 for Fe3+and Cu2+are 5.9×10-6 mol and 1.1 ×10-6 mol respectively,and the recognition ability of Z1-2 is less affected by pH value.
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