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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. L could perform as an “OFF–ON” molecular switch, which was cyclically controlled by Mg2+ and EDTA. Moreover, further study demonstrated that the detection limit for the fluorescence response of L to Mg2+ was down to 9.2 × 10−10 M, which was lower than with other sensors for Mg2+. Test strips based on L were also fabricated, which could act as a convenient and efficient Mg2+ test kit. The sensor L could detect Mg2+ in two different sources of water, distilled and tap water.

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

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