首页|Synthesis and structural analysis of push-pull imidazole-triazole based fluorescent bifunctional chemosensor for Cu~(2+)and Fe~(2+)detection
Synthesis and structural analysis of push-pull imidazole-triazole based fluorescent bifunctional chemosensor for Cu~(2+)and Fe~(2+)detection
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NSTL
Fluorescent imidazole-triazole based ligands L1 and L2 have been designed as chemical push-pull chemosensors for divalent metal ions and synthesized through palladium-catalyzed cross-coupling reactions using indium or-ganometallics and click chemistry.The novel ligands exhibit intense absorption in the ultraviolet region with high molar extinction coefficients,and strong fluorescence emission with large Stokes displacements.On the basis of UV-Vis absorption spectroscopy and fluorescence emission data in acetonitrile,L1 is shown as a bifuncional chemosensor with differential response for Fe~(2+)and Cu~(2+)over a range of selected 3d divalent and other metal ions.The binding site of the ligand was established by single-crystal X-ray diffraction and ~1H NMR spectroscopy studies.The association constants,determined by spectrofluorimetric titrations,show a steady binding affinity of L1 for Cu~(2+)and Fe~(2+)in comparison with other previously reported fluorescent bidentate chemosensors,offering the lowest limit of detection(LOD)with Cu~(2+).DFT calculations provide a rationale properly understanding and interpreting the experimentally observed results.Indeed,a mechanism of the different optical responses of LI towards 3d divalent metal ions is proposed.
NSTL
