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A new designed fluorescent chemosensor TYMN ((E)-1-((thiazol-2-ylimino)methyl) naphthalen-2-ol) for highly sensitive and selective tracing of trace amount of Zn ions in some real samples was synthesized and characterized. The sensor TYMN can detect Zn ions via fluorescence enhancement with a high selectivity over a wide range of metal ions, especially Cd. The sensor showed large fluorescence enhancement upon complexation with Zn and simultaneous color change from yellow to orange. The limit of detection was analyzed to be 0.0311 μM with a linear dynamic range 0.1-1.0 μM. The sensor could work in a pH span of 5.0-8.0. Based on the physicochemical and analytical methods like electrospray ionization (ESI)-mass, Job plot, H nuclear magnetic resonance (NMR) and theoretical calculations, the detection mechanism for Zn was explained based on restriction of internal charge transfer (ICT) mechanism. TYMN sensor was potentially utilized for Zn ions concentration evaluation in some real samples. Fluorescence microscopy experiments revealed that probe TYMN may have application as a fluorophore to detect the Zn in living cells.

A Simple Fluorescent Chemosensor for Detection of Zinc Ions in Some Real Samples and Intracellular Imaging in Living Cells