Electrochemistry of redox-active self-assembled monolayers.

Electrochemistry of redox-active self-assembled monolayers.
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DOI:
10.1016/j.ccr.2009.12.023
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发表时间:
2010-08-01
影响因子:
20.6
通讯作者:
Meade TJ
Meade TJ
中科院分区:
化学1区
文献类型:
--
作者:
Eckermann AL;Feld DJ;Shaw JA;Meade TJ

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氧化还原活性的自组装单分子膜(SAMs)为研究电子转移动力学提供了一个很好的平台。使用定义明确的桥,氧化还原中心可以位于距电极固定距离的位置,并使用各种电化学技术探测电子转移动力学。循环伏安法、交流伏安法、电化学阻抗谱和计时电流法是最常用于测定氧化还原活化的自组装膜的电子转移速率的方法。各种氧化还原物质已经附着到SAM上,并且包括过渡金属络合物(例如,二茂铁,五氨合钌,锇联吡啶,金属簇)和有机分子(例如,galvinol,C60)。自组装膜为研究氧化还原物种的外层相互作用提供了理想的环境。单层和电极材料的组成和完整性影响电子转移动力学,并且可以使用电化学方法进行研究。理论模型已经被开发用于调查SAM结构。本文综述了氧化还原活性自组装膜的电化学测量方法和单层组成。
Redox-active self-assembled monolayers (SAMs) provide an excellent platform for investigating electron transfer kinetics. Using a well-defined bridge, a redox center can be positioned at a fixed distance from the electrode and electron transfer kinetics probed using a variety of electrochemical techniques. Cyclic voltammetry, AC voltammetry, electrochemical impedance spectroscopy, and chronoamperometry are most commonly used to determine the rate of electron transfer of redox-activated SAMs. A variety of redox species have been attached to SAMs, and include transition metal complexes (e.g., ferrocene, ruthenium pentaammine, osmium bisbipyridine, metal clusters) and organic molecules (e.g., galvinol, C60). SAMs offer an ideal environment to study the outer-sphere interactions of redox species. The composition and integrity of the monolayer and the electrode material influence the electron transfer kinetics and can be investigated using electrochemical methods. Theoretical models have been developed for investigating SAM structure. This review discusses methods and monolayer compositions for electrochemical measurements of redox-active SAMs.
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