Preparation and General Properties of Chemically Modified Electrodes Based on Electrosynthesized Thin Polymeric Films Derived from Eugenol
Preparation and General Properties of Chemically Modified Electrodes Based on Electrosynthesized Thin Polymeric Films Derived from Eugenol
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DOI：
10.1002/1521-4109(200106)13:10
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发表时间：
2001-06
期刊：
影响因子：
3
通讯作者：
A. Ciszewski;G. Milczarek
中科院分区：
文献类型：
--
作者：
A. Ciszewski;G. Milczarek
丁子香酚（4-烯丙基-2-甲氧基苯酚）在铂电极和玻碳电极上用循环伏安法氧化聚合。结果发现，在铂的聚合产生一个均匀的，紧凑的膜，可以作为一个选择性渗透膜的小分子大小的分析物。提出了这种薄膜在过氧化氢和一氧化氮选择性检测中的应用。在玻璃碳中的金属氧化导致不太致密的膜。有趣的是，在较高的电位下，产生了含有大量未氧化的邻甲氧基苯基的多孔结构。这种结构经历电化学脱甲氧基导致氧化还原活性邻醌功能的产生时，在酸性溶液中的修饰电极循环。还产生了少量的对苯醌官能团。可以预期的是，氧化还原电对能够介导抗坏血酸和NADH的电化学氧化。此外，聚合丁香酚涂层的GC表现出对溶解的金属阳离子的预浓缩能力。这种效果被证明对预浓缩的Ce（III）和还原的Cu（II）的电化学氧化。
Eugenol (4-allyl-2-methoxyphenol) was polymerized oxidatively by cyclic voltammetry at platinum and glassy carbon electrodes. It was found that at platinum the polymerization gives rise to a uniform, compact film which could serve as a permselective membrane for analytes of small molecular size. Applications of such films in selective detection of hydrogen peroxide and nitric monoxide were proposed. Monomer oxidation at glassy carbon resulted in less compact films. Interestingly, at higher potentials a porous structure containing large amount of unoxidized o-methoxyphenyl groups was created. This structure underwent electrochemical demethoxylation leading to the generation of redox active o-quinone functionalities when the modified electrode was cycled in acidic solution. A small amount of p- quinone functionalities was also generated. As could be anticipated the redox couples were capable of mediating electrochemical oxidation of ascorbic acid and NADH. Additionally polymeric eugenol-coated GC exhibited preconcentration capabilities towards dissolved metal cations. This effect was demonstrated on the electrochemical oxidation of preconcentrated Ce(III) and reduction of Cu(II).