A multifunctional fluorescent chemosensor for Al3+ and Cu2+ has been developed, which displays a dual-model and on–off fluorescence response upon addition of Al3+ and Cu2+ respectively. The fluorescence signals of the chemosensor can be restored with F− and ethylenediaminetetraacetic acid (EDTA) disodium for Al3+ and Cu2+, showing that the binding of the chemosensor and Al3+/Cu2+ is chemically reversible. The ‘in situ’ prepared Al3+ complex (1·Al) showed high selectivity toward F−, which can be applied to distinguish F− from Cl−, Br− and I−. Moreover, the fluorescence emission intensity of the ‘in situ’ prepared Cu2+ complex (1·Cu) is increased with the addition of Al3+, demonstrating that 1·Cu could be a good off–on Al3+ sensor candidate.
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