A Schiff base sensor for relay monitoring of In3+ and Fe3+ through “off–on–off” fluorescent signals?
New Journal of Chemistry Pub Date: 2021-03-03 DOI: 10.1039/D1NJ00929J
Abstract
A Schiff base N′-(3-ethoxy-2-hydroxybenzylidene)-4,5-dihydronaphtho[1,2-b]thiophene-2-carbohydrazide (LB2) was designed and synthesized based on 4,5-dihydronaphtho[1,2-b]thiophene-2-carbohydrazide and 3-ethoxy-2-hydroxybenzaldehyde, and could be used as a sensor to identify In3+ and Fe3+ through fluorescence ‘off–on–off’ behavior. The probe LB2 showed high sensitivity and selectivity towards In3+ and Fe3+ in the presence of other metal ions with detection limits of 8.05 × 10?9 M and 2.59 × 10?8 M, respectively. The structure of LB2 was characterized by 1H NMR, 13C NMR, FTIR and mass spectrometry. The complexation ratio of LB2 to In3+ and Fe3+ was 1?:?1 for both which was verified by mass spectrometry and the Job plot. The binding mode and sensing mechanism of LB2 with In3+ and Fe3+ were also verified.
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Journal Name：New Journal of Chemistry
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CAS no.: 89640-58-4
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