A simple pyrazoline-based ''turn off'' fluorescent sensor 5-(4-methoxyphenyl)-3-(5-methylfuran-2-yl)-1-phenyl-4,5-dihydro-1H-pyrazole (PFM) was synthesized and well characterized by different techniques such as FT-IR, H-NMR, C-NMR, and mass spectrometry. The synthesized sensor PFM was utilized for the detection of Fe ions. Fluorescence emission selectively quenched by Fe ions compared to other metal ions (Mn, Al, Fe, Hg, Cu, Co, Ni, Cd, Pb, and Zn) via paramagnetic fluorescence quenching and showed good anti-interference ability over the existence of other tested metals. Under optimum conditions, the fluorescence intensity of sensor quenched by Fe in the range of 0 to 3 μM with detection limit of 0.12 μM. Binding of Fe ions to PFM solution were studied by fluorescent titration, revealed formation of 1:1 PFM-Fe metal complex and binding constant of complex was found to be of 1.3 × 10 M. Further, the fluorescent sensor has been potentially used for the detection of Fe in environmental samples (river water, tap water, and sewage waste water) with satisfactory recovery values of 99-101%.
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