Self-assembly of 6-thioguanine and 6-thioguanosine monolayers on the mercury electrode: effects of oxygen and applied potential

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• 作者：Zoraida Gonz&aacute ; lez Arias ; Jesú ; s Luis Muñ ; iz &Aacute ; lvarez ; Juan Miguel Ló ; pez Fonseca ; ^{fonseca@fluor.quimica.uniovi.es}
• 关键词：Self-assembled monolayers (SAMs) ; 6-thioguanine ; 6-thioguanosine ; Mercury electrode ; Chronoamperometry ; Cyclic voltammetry ; Open circuit potential measurements
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：2005
• 出版时间：1 February 2005
• 年：2005
• 卷：575
• 期：2
• 页码：243-248
• 全文大小：295 K

文摘

The formation of self-assembled monolayers (SAMs) of 6-thioguanine and 6-thioguanosine on mercury from deaerated and air-saturated aqueous solutions has been studied. The self-assembly process was investigated using chronoamperometry, cyclic voltammetry and open circuit potential (ocp) measurements. The presence of dissolved oxygen is a necessary condition for the formation of full SAMs on a hanging mercury drop electrode (HMDE) at ocp. In the absence of oxygen, the formation of such SAMs requires application of an appropriate potential to the HMDE during a certain period of time. The effects of oxygen and applied potential are explained on the basis of the charge-transfer reaction involved in the self-assembly process.