| 研究実績の概要 |
The aim of the proposed research plan is to develop a bipolar electrochemical method for the generation of electrochemiluminescence (ECL) from organic molecules in aqueous solution. 9,10-diphenylanthracene (DPA) was emplyed as a model organic compound to establish the electrochemical methodology. DPA was incorporated in micelles generated from a redox-active surfactant and then solubilized in water where, after surfactant oxidation, could be released in the proximity of the electrode surface due to the cleavage of the surfactant micelles. Scanning at positive potentials and in presence of a suitable coreactant, such as oxalic acid, DPA oxidation leaded to the generation of a light emission, namely ECL, in water.
The established methodology could be realized either (i) having both DPA and the coreactant free to diffuse in solution and (ii) with only DPA immobilized as a thin gradient film prepared through the aid of bipolar electrochemistry. In the latter case, the ECL emission from a gradient DPA film clearly resulted in a two colors emission with two distinctive emission wavelenghts that were attributed to the formation of an excimer species of DPA. ECL emission from gradient DPA films was also observed using Tri-n-propylamine as a coreactant.
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