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

Abstract 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.