Novel receptors with quinoline and amide moieties for the biologically important ions

New chromogenic anion receptors 2 and 4 utilizing quinoline and nitrophenyl groups as signaling groups were synthesized. In these receptors, amide and amine groups made strong multiple hydrogen interactions with anions. The receptors 2 and 4 bind anions with a selectivity of F− > CN− > CH3CO2- and proved to be an efficient naked-eye detector for the fluoride and cyanide ion.

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