A quinolimide-based reversible fluorescent sensor for Cu (2+) and S 2- and its applications

A quinolimide-based reversible fluorescent sensor QPC with carboxamidoquinoline as the receptor was prepared for the relay recognition of Cu 2 + and S 2 -. QPC displayed the high selectivity and antiinterference ability to Cu 2 + through the 1:1 binding mode. Subsequently, the selectively sensing S 2 - with the QPC -Cu 2 + complex gave a remarkable recovery of the emission. The LODs of QPC and its Cu 2 + complex for Cu 2 + and S 2 - were calculated to be 47.8 nM and 0.178 mu M, respectively. Moreover, QPC and its Cu 2 + complex had the satisfactory recoveries 93.5-105.8% for Cu 2 + and 97.7-104.0% for S 2 - in water samples, and exhibited low cytotoxicity, which enabled them to image Cu 2 + and S 2 - in yeast cells.