Recognition of Mg2+ and Zn2+ based on a naphthalene-based fluorescent probe by regulating solvents

A highly selective and sensitive fluorescent chemosensor and its application for rapid on-site detection of Al3

In this paper, a simple naphthalene-based derivative (HL) has been designed and synthesized as a Al³⁺-selective fluorescent chemosensor based on the PET mechanism. HL exhibited high selectivity and sensitivity towards Al³⁺ over other commonly coexisting metal ions in ethanol with a detection limit of 2.72nM. The 1:1 binding stoichiometry of the complex (HL-Al³⁺) was determined from the Job's plot based on fluorescence titrations and the ESI-MS spectrum data. Moreover, the binding site of HL with Al³⁺ was assured by the ¹H NMR titration experiment. The binding constant (Ka) of the complex (HL-Al³⁺) was calculated to be 5.06×10⁴M^-1 according to the Benesi-Hildebrand equation. In addition, the recognizing process of HL towards Al³⁺ was chemically reversible by adding Na₂EDTA. Importantly, HL could directly and rapidly detect aluminum ion through the filter paper without resorting to additional instrumental analysis.

C, Israel V. M. V. E, Selvakumar PM. Development of a fluorescent chemosensor towards sensing and separation of Mg2+ ions in chlorophyll and hard water

A dyad receptor bearing a disulfide spacer and a naphthol terminal group has been designed for sensing of Mg²⁺ ions and the receptor incorporated polysulphone membrane is used to remove Mg²⁺ ions present in hard water.

A turn-on fluorescent chemosensor based on acylhydrazone for sensing of Mg2+ with a low detection limit

A novel highly selective chemosensor for Mg²⁺ ions based on the naphthalene group as the fluorophore has been designed and synthesized, which shows a fluorescence turn-on response from colorless to green for Mg²⁺ ions in DMSO–H₂O solutions.