An efficient and sensitive chemosensor based on salicylhydrazide for naked-eye and fluorescent detection of Zn 2 .

We reported here the synthesis of a diarylethene with a 2,4-dihydroxybenzoyl hydrazine moiety (1O) for Zn 2+ recognition. The compound is easy to prepare with a high yield up to 85%. Compound 1O can act as a highly selective and specific fluorescent sensor for Zn 2+ without interference by other common metal ions. The LOD for Zn 2+ detection was determined to be 1.28 × 10 -6 mol L -1 . Meanwhile, 1O can be used as a naked-eye detector for the Zn 2+ ion with an obvious color change from colorless to olive. Based on the fluorescent properties of 1O, we constructed a logic circuit with four inputs of the combinational stimuli of UV/vis light and Zn 2+ /EDTA, and one output of fluorescence intensity.