Aminoquinoline-based fluorescent probe for detection of Cu2 + and hydrogen sulfide

Diethyl 2,2′-(2-oxo-2-(quinolin-8-ylamino)ethylazanediyl) diacetate (DOQED), an aminoquinoline-based fluorescent probe, was synthesized, and successfully applied in detection of Cu2 + and S2 − in an aqueous buffered solution. The emission signal of DOQED was selectively quenched by Cu2 +, and was exclusively recovered by subsequent addition of S2 −. The formation of a [Cu(DOQED)]2 + complex was confirmed by X-ray crystallography.