Abstract
A new fluorescent sensor 1, based on thiophene and diethylaminophenol moieties, has been synthesized and its binding capabilities for metal-ion and anion recognition were investigated. The sensor 1 showed ‘turn-on’ fluorescence in the presence of Al3+ and F−. The sensing behaviors of 1 with Al3+ and F− were studied by using photophysical experiments, 1H NMR titration, and ESI-mass spectrometry analysis. The detection limits for the analysis of Al3+ and F− were found to be 0.41 μM and 14.36 μM, respectively, which are below the WHO guidelines for drinking water (7.41 μM for Al3+ and 79 μM for F−). Moreover, turn-on fluorescence of 1 toward Al3+ and F− caused by intramolecular charge transfer (ICT) was well explained by density functional theory (DFT) calculations. Importantly, 1 could be used to detect Al3+ in the living cells.
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