Electrochemiluminescence of dipicolinic acid (DPA) and (bpy)2Ru(DPA)+ (bpy = 2,2'-bipyridine)
The spectroscopic and electrochemiluminescence (ECL) properties of dipicolinic acid (DPA), (bpy)2Ru2+ (bpy = 2,2'‐bipyridine) and the species formed when DPA and (bpy)2Ru2+ [abbreviated to (bpy)2Ru(DPA)+] are allowed to react are reported. The UV‐Vis absorption maxima for (bpy)2Ru2+ and (bpy)2Ru(DPA)+ are 493 and 475 nm, respectively, indicating the in situ formation of a complex between DPA and (bpy)2Ru2+. DPA, (bpy)2Ru2+ and (bpy)2Ru(DPA)+ display ECL upon oxidation in the presence of the oxidative-reductive co‐reactant tri‐n‐propylamine (TPrA). The ECL of (bpy)2Ru(DPA)+ is at least two‐fold higher than either of the parent species. An ECL spectrum of (bpy)2Ru(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.
electrochemiluminescence, dipicolinic acid, ruthenium bipyridyl, coreactant
Byrd, Jessica, John G. Bruno, and Mark M. Richter. "Electrochemiluminescence of dipicolinic acid (DPA) and (bpy) 2Ru (DPA)+(bpy= 2, 2′‐bipyridine)." Luminescence: The journal of biological and chemical luminescence 21, no. 2 (2006): 72-76.