Synthesis and structural analysis of push-pull imidazole-triazole based fluorescent bifunctional chemosensor for Cu2+ and Fe2+ detection

Fluorescent imidazole-triazole based ligands L1 and L2 have been designed as chemical push-pull chemosensors for divalent metal ions synthesized through palladium-catalyzed cross-coupling reactions using indium organometallics click chemistry. The novel exhibit intense absorption in the ultraviolet region with high molar extinction coefficients, strong fluorescence emission large Stokes displacements. On basis of UV–Vis spectroscopy data acetonitrile, is shown a bifuncional chemosensor differential response Fe2+ Cu2+ over range selected 3d other ions. binding site ligand was established by single-crystal X-ray diffraction 1H NMR studies. association constants, determined spectrofluorimetric titrations, show steady affinity comparison previously reported fluorescent bidentate chemosensors, offering lowest limit detection (LOD) Cu2+. DFT calculations provide rationale properly understanding interpreting experimentally observed results. Indeed, mechanism different optical responses towards proposed.