Abstract
A new sulfide-selective chemosignaling system was devised based on a Cu(2+) complex of fluorescein derivative having a dipicolylamine (DPA) binding site; the fluorescein-DPA conjugate 1, in the presence of Cu(2+) ions, revealed a selective turn-on type signaling behavior toward sulfide ions with a detection limit of 420 nM in 100% aqueous solution.
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