Two new reaction-based molecular probes ResCo and ResCu are reported for the selective colourimetric and fluorometric detection of Co2+ and Cu+, respectively. The receptor in these probes differs by a single metal coordinating site combined with resorufin as a common reporter dye, which exhibit visible absorption and emission in the longer wavelength regions. Co2+- and Cu+-mediated oxidative benzylic ether (C–O) bond cleavage in ResCo and ResCu, respectively, releases resorufin dye which offer ‘switch-on’ fluorometric and ratiometric visible absorption (colourimetric) in a reducing aqueous environment. Reaction-based selective detection of Co2+ and Cu+ is demonstrated in the presence of all other competing metal ions. Submicromolar concentration of Co2+ and Cu+ can be easily detected through dual signaling (fluorometric and colourimetric) pathways. The probes ResCo and ResCu are employed for ‘switch-on’ fluorescence live cell imaging of Co2+ and Cu+, respectively, in HEK293T cells.
据报道,两种新的基于反应的分子探针 ResCo 和 ResCu 分别用于 Co2+ 和 Cu+ 的选择性比色和荧光检测。这些探针中的受体的不同之处在于单个
金属配位位点与作为常见报告
染料的
试卤灵结合,在较长波长区域表现出可见的吸收和发射。 ResCo 和 ResCu 中的 Co2+- 和 Cu+ 介导的氧化苄基醚 (C-O) 键断裂分别释放
试卤灵染料,该
染料在还原性
水环境中提供“开启”荧光和比率可见光吸收(比色)。在所有其他竞争
金属离子存在的情况下,证明了基于反应的 Co2+ 和 Cu+ 选择性检测。通过双信号(荧光和比色)途径可以轻松检测亚微摩尔浓度的 Co2+ 和 Cu+。探针 ResCo 和 ResCu 分别用于 HEK293T 细胞中 Co2+ 和 Cu+ 的“开启”荧光活细胞成像。