1,2,3-Triazole based chemosensor is synthesized using “Click chemistry” approach. Addition of fluoride ion “turn-on” the fluorescence response of probe.

A novel bis-1,4-disubstituted-1,2,3-triazole chemosensor, accessed with "Click Chemistry", was probed for its recognition of metal ions. The interaction of the sensor with various cation analytes was investigated by 1 H-NMR, UV-Vis absorption and fluorescence spectroscopy. The bis-triazole is selective for Cu(II) with a detection limit in the micromolarconcentration range and a clear to yellow colorimetric response that is exclusive to that ion is observed. The stoichiometry of probe to Cu(II), 2 : 1, was determined with Job's plots based on titration studies using UV-absorption and 1 H-NMR spectroscopy. Computational and spectroscopic investigations revealed that the sensor binds to Cu(II) via its triazole units. Keywords: , there are less reports for bis-triazole sensors that provide a colorimetric signal.(43) Additionally, in many instances the bistriazole sensors fail to respond exclusively to Cu(II).(31, 34, 37, 38) Herein, we report the synthesis of a novel bis-1,2,3triazole sensor appended with phenolic groups, (2,2-bis((1-(2hydroxyphenyl)-1H-1,2,3-triazol-4-yl)methyl)-5,5dimethylcyclohexane-1,3-dione) (BPT) (Scheme 1). BPT exhibits a selective colorimetric response to copper(II), clear to yellow. To verify the selectivity, BPT was screened against an series of metal ions

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