Electrochemiluminescence of dipicolinic acid (DPA) and (bpy)2Ru(DPA)+ (bpy = 2,2'-bipyridine)

Abstract

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.

Department(s)

Chemistry and Biochemistry

Document Type

Article

DOI

https://doi.org/10.1002/bio.886

Keywords

electrochemiluminescence, dipicolinic acid, ruthenium bipyridyl, coreactant

Publication Date

2006

Journal Title

Luminescence

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