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Synthesis and fluorescence turn-on behavior of a naphthalimide based probe is described. Selective interactions of trivalent cations Fe3+, Al3+ or Cr3+ with probe 1 inhibit the PET operating in the probe, and thereby, permit the detection of these trivalent cations present in aqueous samples and live cells. Failure of other trivalent cations (Eu3+, Gd3+ and Nb3+) to inhibit the PET process in 1 demonstrates...
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