Abstract
A novel benzothiazole-functionalized fluorescein derivative was designed and synthesized. Sensor 1 displays highly selective and sensitive OFF–ON fluorescence response and naked-eye color change to Fe3+ in aqueous solution at pH 7.2. The mechanisms have been supported by Job’s plot evaluation, fluorescence titrations, MS, and 1H NMR spectroscopic studies. The detection limits of sensor 1 to Fe3+ were estimated to be 7.4nM. 1 exhibits low cytotoxicity and cell-membrane permeability, which makes it capable of Fe3+ bioimaging in living Hep G2 cells.
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