摘要:
A fluorescent sensor QB, based on quinoline with DPA as receptor, is designed as a ratiometric sensor for Zn2+ and CHEF (chalation enhanced fluorescence) sensor for Cd2+. Moreover, another ratiometric signal output for Cd2+ can be observed when the bound Zn2+ in the QB-Zn2+ complex is displaced by Cd2+. These results demonstrate that OB can act not only as a ratiometirc sensor for Zn2+ but also as a dual-mode Cd2+-selective sensor via the CHEF mechanism and ratiometric displacement.