Electrochemiluminescence of dipicolinic acid (DPA) and (bpy)(2)Ru(DPA)(+) (bpy = 2,2'-bipyridine).
The spectroscopic and electrochemiluminescence (ECL) properties of dipicolinic acid (DPA), (bpy)(2)Ru(2+) (bpy = 2,2'-bipyridine) and the species formed when DPA and (bpy)(2)Ru(2+) [abbreviated to (bpy)(2)Ru(DPA)(+)] are allowed to react are reported. The UV-Vis absorption maxima for (bpy)(2)Ru(2+) and (bpy)(2)Ru(DPA)(+) are 493 and 475 nm, respectively, indicating the in situ formation of a complex between DPA and (bpy)(2)Ru(2+). DPA, (bpy)(2)Ru(2+) and (bpy)(2)Ru(DPA)(+) display ECL upon oxidation in the presence of the oxidative-reductive co-reactant tri-n-propylamine (TPrA). The ECL of (bpy)(2)Ru(DPA)(+) is at least two-fold higher than either of the parent species. An ECL spectrum of (bpy)(2)Ru(DPA)(+) displays a peak maximum 40 nm red-shifted from the photoluminescence peak maximum, suggesting that the excited state formed electrochemically is different from that formed spectroscopically.
Byrd
Jessica
J
Department of Chemistry, Missouri State University, Springfield, MO 65897, USA.
Bruno
John G
JG
Richter
Mark M
MM
D000042:Absorption; D004563:Electrochemistry / Q000379:methods; D049449:Luminescence; D008163:Luminescent Measurements / Q000379:methods*; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010777:Photochemistry / Q000379:methods; D010848:Picolinic Acids / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D012680:Sensitivity and Specificity
C511338:(2,2'-bipyridine)(dipicolinic acid)ruthenium(II); D009942:Organometallic Compounds; D010848:Picolinic Acids; D012428:Ruthenium; C004860:dipicolinic acid