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A novel, simple, highly selective, and sensitive fluorescence chemosensor for detecting Cd 2+ that was constructed from a bis(salamo)-type compound (H₄L) with two N₂O₂ chelating moieties as ionophore was successfully developed. Sensor H₄L could show fluorescence turn-on response rapidly and significant selectivity to Cd 2+ over many other metallic ions (Cu 2+ , Ba 2+ , Ca 2+ , K⁺, Cr 3+ , Mn 2+ , Sr 2+ , Co 2+ , Na⁺, Li⁺, Ni 2+ , Ag⁺, and Zn 2+ ), and a clear change in color from colorless to yellow that can be very easily observed via the naked eyes in the existence of Cd 2+ , while other metallic ions do not induce such a change. Interestingly, its fluorescent intensity was increased sharply with the increased concentration of Cd 2+ . The detection limit of sensor H₄L towards Cd 2+ was down to 8.61 × 10 -7 M.

A Reversible Bis(Salamo)-Based Fluorescence Sensor for Selective Detection of Cd2+ in Water-Containing Systems and Food Samples