Abstract By using an anthryl-phenyl-imidazo-phen as a pH responsive ligand, a binuclear ruthenium complex has been synthesized as a pH luminescence probe under visible light excitation at 460 nm. The ground- and excited-state acid–base properties of the complex were studied by UV–visible and emission spectrophotometric pH titrations. The excited-state ionization constants of pKa2* = 6.92 is in a physiologically relevant regime and the complex is an “on-off” type fluorescent pH sensor. In addition, electrochemical studies of the binuclear ruthenium complex show one Ru(II)-centered oxidation at 1.29 V and three ligand-centered reductions.

中文翻译：

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含咪唑的蒽桥双核钌配合物的制备、表征、pH滴定和电化学性质

摘要 通过使用蒽基-苯基-咪唑并苯作为pH响应配体，在460 nm可见光激发下合成了双核钌配合物作为pH发光探针。通过紫外可见分光光度法和发射分光光度法 pH 滴定法研究了复合物的基态和激发态酸碱性质。pKa2* = 6.92 的激发态电离常数处于生理相关状态，复合物是“开关”型荧光 pH 传感器。此外，双核钌配合物的电化学研究表明，在 1.29 V 下有一个以 Ru(II) 为中心的氧化和三个以配体为中心的还原。