Abstract A ratiometric sensor (QA) for detecting Zn 2+ with high sensitivity and selectivity was reported. The fluorescence changes of sensor upon the addition of Zn 2+ were attributed to the conjugation of internal charge transfer and fluorescence resonance energy transfer mechanisms. There is a good linear relationship between the fluorescence ratio I 497 nm/I 420 nm and the concentrations of Zn 2+ ranging from 0 μM to 40 μM, which makes an ...
