Analytical Sciences

Chemiluminescence Detection of Five-membered Heteroaromatic Compounds Using Electrogenerated Tris(2,2′-bipyridine)-ruthenium(III)

Hitoshi KODAMATANI,* Yu KOMATSU,* Shigeo YAMAZAKI,** and Keiitsu SAITO***

*Department of Environmental Chemistry, Kanazawa Institute of Technology, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501, Japan
**Department of Applied Science, Okayama University of Science, 1-1 Ridaicho, Okayama 700-0005, Japan
***Division of Natural Environment and Chemistry, Faculty of Human Development, Kobe University, 3-11 Tsurukabuto, Nada, Kobe 657-8501, Japan

Heteroaromatic compounds, such as 2,5-dimethylthiophene, 2,5-dimethylpyrrole, and 2,5-dimethylfuran, were found to act as reducing agents for the tris(2,2′-bipyridine)ruthenium(III), Ru(bpy)₃³⁺, chemiluminescent reaction. In order to characterize the chemiluminescent reaction of Ru(bpy)₃³⁺ with heteroaromatic compounds, we have investigated various mono-, di-, and tri-heteroaromatic compounds. The π-electron density and stability of aromatic rings influence the chemiluminescent efficiency of the reaction. Above all, 2,5-dimethylthiophene produced strong chemiluminescence under acidic conditions. In addition, we confirmed that the rate of the chemiluminescent reaction of Ru(bpy)₃³⁺ with 2,5-dimethylthiophene is very fast.

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