Electrode Processes in a Thin Layer of Organic Solvent Covering a Hanging Mercury Drop Electrode. Effects on Metal Ion and Fullerene (C60) Reduction

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• 作者：Krzysztof Winkler ; Robert Mojsa ; David A. Costa ; and Alan L. Balch
• 刊名：Analytical Chemistry
• 出版年：1998
• 出版时间：December 15, 1998
• 年：1998
• 卷：70
• 期：24
• 页码：5244 - 5251
• 全文大小：113K
• 年卷期：v.70,no.24(December 15, 1998)
• ISSN：1520-6882

文摘

A novel approach to electrochemistry in thin layers oforganic solvents is presented. These layers are formed insitu from benzene, o-dichlorobenzene, or dichloromethaneon a hanging mercury drop electrode (HMDE). Very thinorganic layers are formed by the expansion of a mercurydrop and an organic layer into an aqueous bulk phase.The process of expansion and formation of the thin organiclayer on mercury was studied by optical microscopy.Modification of the HMDE by these thin layers of organicsolvents significantly limits the reduction of metal ionsfrom the aqueous bulk solution. The redox behavior ofC₆₀ in these thin films is shown to be highly solventdependent. This dependence is demonstrated by comparison of the cyclic voltammetry of C₆₀ in a benzene layerwith that in an o-dichlorobenzene layer. In the potentialrange from 0 to -1200 mV, two reversible reductionprocesses are observed for C₆₀. In benzene, with its verylow dielectric constant, the electrode processes are complicated by the precipitation of fulleride salts.