Host−Guest Complexation in Self-Assembled Monolayers: Inclusion of a Monolayer-Anchored Cationic Ferrocene-Based Guest by Cyclodextrin Hosts
Host−Guest Complexation in Self-Assembled Monolayers: Inclusion of a Monolayer-Anchored Cationic Ferrocene-Based Guest by Cyclodextrin Hosts
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DOI：
10.1021/la960660a
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发表时间：
1998-06
期刊：
影响因子：
3.9
通讯作者：
R. Sabapathy;S. Bhattacharyya;W. Cleland;C. Hussey
中科院分区：
文献类型：
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作者：
R. Sabapathy;S. Bhattacharyya;W. Cleland;C. Hussey
合成了一种新型的 ω,ω'-二硫代双[烷基(二甲基)(二茂铁基甲基)溴化铵]型二茂铁基二硫化物，并与壬硫醇在气相沉积的 Au(111) 电极表面上共组装。发现共组装的基于二茂铁的阳离子客体单层组装体与β-和γ-环糊精结合形成稳定的主客体复合物。据信环糊精主体以两种方式与单层组装体相互作用：通过在环糊精空腔内包含二茂铁部分以及通过抗衡离子（例如Br-、PF6-或ClO4-）与环糊精分子的亲水平面之间的相互作用。单层和环糊精之间的相互作用主要表现为暴露于环糊精主体的稀溶液（例如，10μM）后表面结合的二茂铁基氧化还原中心的伏安氧化电流的降低。电化学活性的降低源于电荷补偿阴离子与二茂铁基氧化还原的接触受到限制......
A novel ferrocenyl disulfide of the type ω,ω‘-dithiobis[alkyl(dimethyl)(ferrocenylmethyl)ammonium bromide] was synthesized and coassembled with nonanethiol on vapor deposited Au(111) electrode surfaces. The coassembled ferrocene-based cationic guest monolayer assembly was found to bind with β- and γ-cyclodextrins to form stable host−guest complexes. The cyclodextrin hosts are believed to interact with the monolayer assembly in two ways: by inclusion of the ferrocene moiety within the cyclodextrin cavity and by interactions between the counterions (e.g., Br-, PF6-, or ClO4-) and the hydrophilic planes of the cyclodextrin molecules. Interactions between the monolayer and cyclodextrin are manifested primarily by a decrease in the voltammetric oxidation current for the surface-bound ferrocenyl redox centers after exposure to dilute solutions (e.g., 10 μM) of the cyclodextrin hosts. This decrease in electrochemical activity stems from the restricted access of charge-compensating anions to the ferrocenyl redox...