Schiff bases carrying dipicolylamine groups for selective determination of metal ions in aqueous media. A phenanthrene-based fluorescent sensor for Hg2+ determination

Öz

Abstract: Four new dipicolylamine compounds carrying anthracene, naphthalene, pyrene and phenanthrene groups were synthesized, and their ion sensor properties were studied by means of emission spectrometry in ethanol-water (1:1). It was disclosed that among a series of studied anions and cations, only with Cd²⁺, Zn²⁺, Cu²⁺ and Hg²⁺ cations, ligands formed complexes selectively. With spectrofluorimetric measurements, the complexation stoichiometry and the complex stability constants of the formed complexes were determined. A linear range from 0.10 µg L^-1 to0.15 mg L^-1 where the fluorescence intensity of the phenanthrene derivative compound showed a regular decrease with the increase of the Hg²⁺ ion concentration was obtained. The method developed for the determination of Hg²⁺ was applied to tap water samples. In order to eliminate the matrix effect, a modified standard addition method was used. Detection and quantification limits were 0.009 mg L^-1 and 0.027 mg L^-1, respectively.

Anahtar Kelimeler

• Ion sensor; Hg2+ determination; Dipicolylamine; Fluorescence

Kaynakça

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