Here, we report a new Cu2+-selective fluorescent turn-on probe BODIPY-EP, in which the 2-pyridinecarboxylic acid is connected to a 6-hydroxyindole-based BODIPY platform through an ester linkage. The ester bond of BODIPY-EP is selectively hydrolyzed by the reaction with Cu2+ under mild and neutral conditions to generate BODIPY-OH, showing strong characteristic fluorescence of BODIPY-OH. The favorable features of BODIPY-EP towards Cu2+ include fast response, large fluorescence enhancement and high selectivity. We further demonstrated that the membrane-permeable probe reacts with intracellular Cu2+ and exhibits bright fluorescence in living cells.
我们在此报告了一种新的选择性识别Cu2+的荧光开关探针BODIPY-EP,其中
2-吡啶甲酸通过酯键连接至
6-羟基吲哚基BODIPY平台。BODIPY-EP的酯键在温和和中性条件下与Cu2+反应被选择性
水解,生成BODIPY-OH,显示出BODIPY-OH的强特征荧光。BODIPY-EP对Cu2+的有利特性包括快速响应、大幅荧光增强和高选择性。我们进一步证明,该膜透过性探针与细胞内的Cu2+反应,并在活细胞中展示出明亮的荧光。