Synthesis and evaluation of the chromo-fluorogenic recognition ability of imidazoquinoline derivatives toward ions

Autores UPV
Revista Dyes and Pigments


Four imidazoquinolines functionalized with different carbocycles and heterocycles were synthesized and characterized. Acetonitrile solns. of the four receptors presented absorption bands in the 330-370 nm range. The four probes were also emissive with fluorescence bands in the 390-460 nm interval. In a 1st step, the chromo-fluorogenic behavior of the four probes was evaluated in the presence of selected anions. Addn. of F- induced the appearance of a new red shifted absorption band together with a moderate quenching of the fluorescence in all four receptors. In a 2nd step, the UV-​visible and emission behavior of the four receptors in the presence of cations was tested. Addn. of Hg2+, Cu2+, Co2+, Fe3+, Fe2+, Zn2+, Pb2+, Cd2+, Cr3+ and Al3+ induced a similar optical change in all four receptors (appearance of a broad red shifted absorption band together with a remarkable quenching of the emission band).