A new fluorescent chemosensor for cadmium(II) based on a pyrene-appended piperidone derivative and its ß-cyclodextrin complex.

We report, in this article, a piperidin-4-one derivative carrying pyrenyl fluorescent reporter groups which acts as a Cd2+ ion sensor. The compound is synthesized and characterized using IR and NMR spectral techniques. The compound forms an inclusion complex with ß-cyclodextrin. It selectively binds to Cd2+ ions in water and aqueous ß-cyclodextrin media. The stoichiometry of the host-guest complex of the compound with ß-cyclodextrin is 1:2. The ligand-metal ion binding stoichiometry is 1:1 both in water and in ß-cyclodextrin. The linear concentration range of detection of the metal ion is reported. Cyclodextrin complex formation does not affect the metal ion selectivity of the compound.