Title

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

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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