title: Potential-resolved electrochemiluminescence of ru(bpy)3(2+)/C2O4(2-) system on gold electrode.
abstract: The electrogenerated chemiluminescence of Ru(bpy)3(2+)/C2O4(2-) system on a pre-polarized Au electrode was studied using a potential-resolved electrochemiluminescence (PRECL) method. Two anodic ECL peaks were observed at 1.22 V (vs. SCE) (EP1), 1.41 V (vs. SCE) (EP2), respectively. The effects of the concentration of oxalate and Ru(bpy)3(2+), adsorbed sulphur, CO2, O2, pH of the solution and pretreatment of the Au electrode on the two PRECL peaks were examined. The surface state of the pre-oxidized gold electrode was also studied using the X-ray photoelectron spectroscopy (XPS) technique. Moreover, comparative studies on i-E and I-E curves were carried out and a possible mechanism involving both the catalytic and the direct electro-oxidation pathways was proposed for the ECL of Ru(bpy)3(2+)/C2O4(2-) system. EPI is attributed to the Ru(bpy)3(2/3+) reaction catalysed by C2O4(2-) to generate Ru(bpy)3(2+)*. EP2 is likely because C2O4(2-) was oxidized at the electrode to form CO2(-)*, followed by reaction with Ru(bpy)3(3+) to generate Ru(bpy)3(2+)*.
authors: Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, Republic of China.
authors: Feng
authors: F
authors: Li
authors: Hua
authors: H
authors: Cui
authors: Xiang-Qin
authors: XQ
authors: Lin
mesh_terms: D015082:2,2'-Dipyridyl / Q000031:analogs & derivatives* / Q000737:chemistry*; D002245:Carbon Dioxide / Q000494:pharmacology; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D006046:Gold; D006863:Hydrogen-Ion Concentration; D049449:Luminescence; D009942:Organometallic Compounds / Q000737:chemistry*; D019815:Oxalic Acid / Q000737:chemistry* / Q000494:pharmacology; D010084:Oxidation-Reduction; D010100:Oxygen / Q000494:pharmacology; D013455:Sulfur / Q000494:pharmacology
chemical_list: D009942:Organometallic Compounds; C469719:ruthenium (bpy)3(2+)-C2O4(2-); D002245:Carbon Dioxide; C058901:tris(2,2'-bipyridine)ruthenium III; D015082:2,2'-Dipyridyl; D013455:Sulfur; D006046:Gold; D019815:Oxalic Acid; D010100:Oxygen