Self-Enhanced Chemiluminescence of Tris(bipyridine) Ruthenium(II) Derivative Nanohybrids: Mechanism Insight and Application for Sensitive Silver Ions Detection

作者：Mengxia Yan, Jing Ye, Qiuju Zhu, Liping Zhu, Ting Xiao, Jianshe Huang, Xiurong Yang · 发表于：Analytical Chemistry · 年份：2020 · DOI：10.1021/acs.analchem.0c00897 · 被引用次数：45 · 研究领域：Molecular Sensors and Ion Detection、Advanced biosensing and bioanalysis techniques、Advanced Nanomaterials in Catalysis

In recent years, self-enhanced tris(bipyridine) ruthenium(II)-based luminescence systems have achieved great development in electrochemiluminescence (ECL) but are seldom mentioned in chemiluminescence (CL). Herein, a self-enhanced CL luminophore with excellent CL behavior was synthesized by covalently cross-linking tris(4,4′-dicarboxylic acid-2,2′-bipyridyl) ruthenium(II) dichloride ([Ru(dcbpy) 3 ]Cl 2 ) with branched polyethylenimine (BPEI) in one molecule (BPEI-Ru(II)), which then self-assembled into nanoparticles (BRuNPs). The nanoparticles exhibited stable and strong CL emission with potassium persulfate (K 2 S 2 O 8 ) as the oxidant. After the redox reaction between K 2 S 2 O 8 and BRuNPs, and the subsequent intramolecular electron-transfer reaction, excited state luminophores were generated to emit light. This self-enhanced CL system shortened the electron transfer distance and reduced energy loss, thus improving the luminous efficiency. In addition, the CL lifetime of BRuNPs/K 2 S 2 O 8 was longer than classical luminophores such as N-(4-aminobutyl)-N-ethylisoluminol (ABEI), indicating the potential application of this system in CL imaging. Surprisingly, Ag + was found to greatly improve the CL efficiency of BRuNPs/K 2 S 2 O 8 by catalyzing the decomposition of K 2 S 2 O 8 to generate SO 4 •– . On the basis of the enhancement effect of Ag +, a simple and rapid CL method was proposed for Ag + detection. The chemosensor showed a wide linear range from 25 to 3000 nM and l...