Highly stable hybrid ligand Double-Enhanced electrochemiluminescence for sensitive detection of Cu2

• Published in: Microchemical journal 2023-02, Vol.185, p.108237, Article 108237
• Main Authors: Zhao, Chulei, Xie, Zhenzhen, Ma, Chaoyun, Deng, Xiling, Hong, Chenglin, Sun, Shiguo
• Format: Article
• Language: English
• Subjects: Detection of Cu2; Electrochemiluminescence; Mixed ligands
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/j.microc.2022.108237

[Display omitted] •Electrochemiluminescent materials with high crystallinity surface state emission are synthesized.•[Ru(bpy)2(phen-ABAH)]Cl2 has a large Stokes shift and a wide pH availability.•Under electrochemical control, the burst of Cu2+ prefers electron transfer to energy transfer. Tris(2,2′–bipyridyl)ruthenium(II) (Ru(bpy)32+) and its derivatives have triggered widespread interest due to their high electrochemiluminescent activity, but their good water solubility limits their applications in electrochemistry. In this study, we report the synthesis of electrochemiluminescent materials [Ru(bpy)2(phen–ABAH)]Cl2 with high crystallinity surface–state emissions using 4–p–hydroxybenzaldehyde (ABAH), 1, 10 phenanthroline–5,6–dione (Phen) and bipyridine (bpy) respectively. The backbone structure of these electrochemiluminescent materials significantly improve the emission intensity compare with that of a single component. More importantly, highly stable electrochemiluminescence (ECL) is achieved by mixed ligands synergy. Furthermore, we investigate the quench mechanism using Cu2+ as a model. Interestingly, under electrochemical control, the quench mechanism of Cu2+ differs from conventional fluorescence quench in that this quench prefers electron transfer to energy transfer. The results show [Ru(bpy)2(phen–ABAH)]Cl2 has new applications in biological and environmental analysis.