title: Mechanism study on inorganic oxidants induced inhibition of Ru(bpy)₃²+ electrochemiluminescence and its application for sensitive determination of some inorganic oxidants.
abstract: Inhibited Ru(bpy)(3)(2+) electrochemiluminescence by inorganic oxidants is investigated. Results showed that a number of inorganic oxidants can quench the ECL of Ru(bpy)(3)(2+)/tri-n-propylamine (TPrA) system, and the logarithm of the decrease in ECL intensity (ΔI) was proportional to the logarithm of analyte concentrations. Based on which, a sensitive approach for detection of these inorganic oxidants was established, e.g. the log-log plots of ΔI versus the concentration of MnO(4)(-), Cr(2)O(7)(2-) and Fe(CN)(6)(3-) are linear in the range of 1×10(-7) to 3×10(-4)M for MnO(4)(-) and Cr(2)O(7)(2-), and 1×10(-7) to 1×10(-4)M for Fe(CN)(6)(3-), with the limit of detection (LOD) of 8.0×10(-8)M, 2×10(-8)M, and 1×10(-8)M, respectively. A series of experiments such as a comparison of the inhibitory effect of different compounds on Ru(bpy)(3)(2+)/TPrA ECL, ECL emission spectra, UV-Vis absorption spectra etc. were investigated in order to discover how these inorganic analytes quench the ECL of Ru(bpy)(3)(2+)/TPrA system. A mechanism based on consumption of TPrA intermediate (TPrA(·)) by inorganic oxidants was proposed.
authors.affiliation: Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, Department of Chemistry, Fuzhou University, Fuzhou 350002, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Qiu
authors.forename: Lingling
authors.initials: L
authors.lastname: Xue
authors.forename: Yanping
authors.initials: Y
authors.lastname: Wu
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Lin
authors.forename: Longhua
authors.initials: L
authors.lastname: Guo
authors.forename: Guonan
authors.initials: G
authors.lastname: Chen
mesh_terms: D015082:2,2'-Dipyridyl; D004563:Electrochemistry / Q000379:methods*; D007287:Inorganic Chemicals / Q000032:analysis*; D057230:Limit of Detection; D008163:Luminescent Measurements / Q000379:methods*; D009942:Organometallic Compounds; D016877:Oxidants; D011437:Propylamines; D012428:Ruthenium; D013057:Spectrum Analysis / Q000379:methods
chemical_list: D007287:Inorganic Chemicals; D009942:Organometallic Compounds; D016877:Oxidants; D011437:Propylamines; C096226:tripropylamine; D015082:2,2'-Dipyridyl; D012428:Ruthenium