Herein, we report on highly Ba selective fluorescence sensing in water by a fluorescent probe consisting of a benzo-21-crown-7 as a Ba binding unit (ionophore) and a tetramethylated BODIPY fluorophore as a fluorescence reporter. This fluorescent probe showed a Ba induced fluorescence enhancement (FE) by a factor of 12±1 independently of the pH value and a high Ba sensitivity with a limit of detection (LOD) of (17.2±0.3) μM. Moreover, a second fluorescent probe consisting of the same BODIPY fluorophore, but a benzo-18-crown-6 as a cation-responsive binding moiety, showed an even higher FE upon Ba complexation by a factor of 85±3 and a lower LOD of (13±3) μM albeit a lower Ba selectivity. The fluorescence sensing mechanism of Ba was further investigated by time-resolved fluorescence as well as transient absorption spectroscopy (TAS) and it turned out that within these probes a blocking of a photoinduced electron transfer (PET) by Ba is very likely responsible for the FE.
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