Analytical Sciences

First Observation of Luminescence from Tris(2,2′-bipyridine)ruthenium(II) Triggered by Anodic Oxidation of Oligodeoxyribonucleotide

Hajime KARATANI

Department of Biomolecular Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo, Kyoto 606-8585, Japan

Anodic oxidation of oligodeoxyribonucleotide in an alkaline aqueous medium containing tris(2,2′-bipyridine)ruthenium(II) (Ru(bpy)₃²⁺) was shown to cause luminescence around +1.3 V (vs. Ag/AgCl) with a maximal intensity at approximately 600 nm, possibly originating from Ru(bpy)₃²⁺ in the d-π^* triplet state. A pivotal initial stage in the light production path was postulated to be the anodic oxidation of 2-deoxyribose residue. This reaction seems to be available for the determination of sub-µmol dm^-3 levels of oligodeoxyribonucleotide.

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