Journal of Fluorescence ( IF 2.6 ) Pub Date : 2022-09-22 , DOI: 10.1007/s10895-022-03024-y Promila Sharma 1 , Shikha Bhogal 1 , Irshad Mohiuddin 2 , Mohamad Yusuf 1 , Ashok Kumar Malik 1
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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, 1H-NMR, 13C-NMR, and mass spectrometry. The synthesized sensor PFM was utilized for the detection of Fe3+ ions. Fluorescence emission selectively quenched by Fe3+ ions compared to other metal ions (Mn2+, Al3+, Fe2+, Hg2+, Cu2+, Co2+, Ni2+, Cd2+, Pb2+, and Zn2+) 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 Fe3+ in the range of 0 to 3 μM with detection limit of 0.12 μM. Binding of Fe3+ 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 × 105 M−1. Further, the fluorescent sensor has been potentially used for the detection of Fe3+ in environmental samples (river water, tap water, and sewage waste water) with satisfactory recovery values of 99–101%.
Graphical abstract
中文翻译：
利用基于吡唑啉的传感器对铁 (III) 离子进行荧光“关闭”传感：实验和计算研究
一种简单的基于吡唑啉的“关闭”荧光传感器 5-(4-methoxyphenyl)-3-(5-methylfuran-2-yl)-1-phenyl-4,5-dihydro-1 H - pyrazole (PFM)通过不同的技术，如 FT-IR、1 H-NMR、13 C-NMR 和质谱法，合成和很好地表征。合成的传感器PFM用于检测Fe 3+离子。与其他金属离子（Mn 2+、Al 3+、Fe 2+、Hg 2+、Cu 2+、Co 2+、Ni 2+、Cd 2+、Pb 2+相比，Fe 3+离子选择性猝灭的荧光发射, 和锌2+ ) 通过顺磁荧光猝灭, 表现出优于其他被测金属存在的抗干扰能力。在最佳条件下，被Fe 3+猝灭的传感器的荧光强度在0～3 μM范围内，检测限为0.12 μM。通过荧光滴定法研究了Fe 3+离子与PFM溶液的结合，揭示了1:1 PFM-Fe金属络合物的形成，发现络合物的结合常数为1.3×10 5 M -1。此外，荧光传感器已潜在地用于检测环境样品（河水、自来水和污水废水）中的 Fe 3+ ，回收率达 99-101%。
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