Electrochemiluminescence of a Vinyl-Functionalized Ruthenium Complex and Its Monolayer Formed through the Photoinduced Thiol-Ene Click Reaction

Graphical Ready to react : Electrochemiluminescence (ECL) generated from vinyl-functionalized bipyridine ruthenium complex, [Ru(bpy) 2 (dvbpy)] 2+ , is studied by using an ECL spooling technique. Its monolayer immobilized on an ITO electrode is also prepared through the thiol-ene click reaction. This solid-state ECL sensor exhibits good ECL stability and a large linear range for the model analysis of common amine species, such as TPrA. Vinyl-functionalized bipyridine ruthenium complex, bis(2,2′-bipyridine)(4,4′-di(4-vinylphenyl)-2,2′-bipyridine)ruthenium(II) hexaflurophosphate [Ru(bpy) 2 (dvbpy)](PF 6 ) 2 , was synthesized and the electrochemiluminescence (ECL) generated in the presence of co-reactant, namely tri- n -propylamine (TPrA), was investigated by using an ECL spooling technique. This complex was then covalently attached to the indium tin oxide electrode surface through photoinduced thiol-ene click chemistry to prepare a solid-state ECL sensor. The covalently immobilized [Ru(bpy) 2 (dvbpy)] 2+ monolayer film exhibited excellent stability toward ECL generation. The analytical sensitivity of the solid-state ECL sensor was evaluated through the detection of TPrA in the aqueous solution. A low limit of detection (LOD) of 0.25 μM and a wide linear range (ca. 10 −7 –10 −4 M) were obtained, indicating its potential usefulness in chemical and biochemical analysis.