Two new fluorescence turn-on chemosensors for cyanide based on dipyridylamine and aurone moiety

Two new fluorescence turn-on chemosensors for cyanide based on dipyridylamine substituted aurone moiety have been synthesized. The strong yellow-green fluorescence of the compounds were completely quenched after the addition of Cu(II) ions because of the complexation between the compounds and Cu(II) ions and were almost recovered after the addition of cyanide owing to the strong bonding ability between cyanide and Cu(II) ions, which lead to the removal of copper ions from the complexes. The chemosensors exhibit good repeatability.