New fluorescent probe for Zn2+ imaging in living cells and plants†
A new fluorescent probe, L1 based on 8-aminoquinoline, was designed and synthesized. It exhibits high selectivity and sensitivity toward Zn2+ over other common metal ions (especially Cd2+). Under physiological conditions (pH 7.0), the probe displays an 8-fold fluorescence turn-on response to Zn2+. Furthermore, using laser scanning confocal techniques, it can be used to effectively monitor and distinguish Zn2+ from Cd2+ in living cells and plant tissues.