Using Click Chemistry to Tune the Properties and the Fluorescence Response Mechanism of Structurally Similar Probes for Metal Ions

摘要: Four cyclam-based fluorescent molecular probes were prepared using “click” chemistry and investigated to determine the effect of triazole connectivity fluorophore substitution on photophysical properties metal-ion response mechanism. The fluorescence ligands is turned in presence ZnII but varies intensity depending solvent; highest signal changes are found MeCN. Complexation with CuII leads quenching, only aqueous solvent, which involved coordination metal. length pendant arm influences ligand field around pentacoordinate yield a distorted square-planar geometry an ethylene linker. quantum (QY) emission can be tuned by substitution, thereby resulting increases QY more than one order magnitude (ligand 1 versus 3). Changing opens up alternative radiative processes, thus leading phosphorescence-like behavior coumarin probe 2. Steady-state spectra free their respective complexes “glass environment” reveal two different inherent quenching mechanisms. In electron-transfer deactivates excited chromophore, whereas it energy transfer that results complete ligands.