A Demonstration of Simultaneous Electrochemiluminescence

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• 作者：Jorge G. Ibanez ; Daniel Zavala-Araiza ; Biaani Sotomayor-Martinez Barranco ; Jonatan Torres-Perez ; Claudia Camacho-Zuniga ; Claudia Bohrmann-Linde ; Michael W. Tausch
• 刊名：Journal of Chemical Education
• 出版年：2013
• 出版时间：April 9, 2013
• 年：2013
• 卷：90
• 期：4
• 页码：470-472
• 全文大小：255K
• 年卷期：v.90,no.4(April 9, 2013)
• ISSN：1938-1328

文摘

Paired (simultaneous) electrochemical processes can increase energy savings in selected cases by using the reactions at both electrodes of an electrochemical cell to perform a desired process, as is the case in the commercially successful chlor-alkali process. In the demonstration described herein, simultaneous blue electrochemiluminescence (ECL) is obtained with luminol in a basic medium in a divided electrochemical cell. ECL is obtained in the anolyte through the direct oxidation of luminol, the reaction products of which interact with H₂O₂ in the vicinity of the electrode to yield an excited emitting species. ECL is also obtained in the catholyte through an indirect, mediated process involving the initial reduction of ClO₂鈥?/sup> to ClO鈥?/sup>, which then reacts with luminol and H₂O₂ to produce the excited emitting species. The co-reactant (H₂O₂) is needed to complete the reaction sequences in both compartments of the cell. This ECL phenomenon is visible to the naked eye in a darkened room at a distance of up to 5 m.

Keywords:

First-Year Undergraduate/General; Upper-Division Undergraduate; Analytical Chemistry; Demonstrations; Interdisciplinary/Multidisciplinary; Hands-On Learning/Manipulatives; Aqueous Solution Chemistry; Electrochemistry; Photochemistry