An off-on-off fluorescence probe based on a pyrazole derivative for Al3+ and Fe3+ detection?
New Journal of Chemistry Pub Date: 2022-11-25 DOI: 10.1039/D2NJ05301B
Abstract
A new fluorescence probe (E)-N′-(2,3-dihydroxybenzylidene)-1-(pyridin-2-yl)-5-(thiophen-2-yl)-1H-pyrazol-3-carbohydrazide (L) was designed and synthesized, which could be applied as an off-on-off sensor for the successive detection of Al3+ and Fe3+. The detection limits of L towards Al3+ and Fe3+ were determined to be 1.10 × 10?8 M and 4.45 × 10?8 M, respectively. The 1?:?2 binding stoichiometry of L to Al3+ and Fe3+ was established from Job plot analysis, 1H NMR spectroscopy and mass spectrometry titration. Application experiments proved that L had excellent ability to monitor Al3+ and Fe3+ in tap water, and the sensing process could be performed on test paper as well.
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Journal Name：New Journal of Chemistry
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CAS no.: 89640-58-4
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