Structure and Properties of Redox Active Self-Assembled Monolayers Formed from Norbornylogous Bridges
Structure and Properties of Redox Active Self-Assembled Monolayers Formed from Norbornylogous Bridges
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DOI：
10.1021/la9012558
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发表时间：
2009-09-15
期刊：
影响因子：
3.9
通讯作者：
Gooding, J. Justin
中科院分区：
文献类型：
--
作者：
Eggers, Paul K.;Zareie, Hadi M.;Gooding, J. Justin
合成了三种不同长度的具有末端二茂铁部分的刚性降冰片桥。对于每个长度的降冰片桥，形成降冰片桥的纯自组装单层(SAM)以及使用羟基封端或甲基封端稀释剂稀释的桥的SAM。使用扫描隧道显微镜 (STM) 对 SAM 进行成像，并研究其电化学特性。研究发现，仅由降冰片烯桥组成的 SAM 是晶体状的，而在降冰片烯桥被稀释的混合 SAM 中，由于降冰片烯桥的刚性，二茂铁位于稀释剂的表面上方，并且均匀分布在表面上。更远。据观察，降冰片桥的电子转移速率与链烷硫醇衍生的二茂铁类似，其结构被设计为尽可能接近降冰片桥的结构。最后，稀释的 SAM 中降冰片桥的电子转移速率因羟基封端的稀释剂而变慢。与甲基封端的稀释剂相比。
Three different length rigid norbornylogous bridges with terminal ferrocene moieties were synthesized. Pure self-assembled monolayers (SAMs) of the norbornylogous bridges and SAMs with the bridges diluted using either hydroxyl-terminated or methyl-terminated diluents were formed for each length of norbornylogous bridge. The SAMs were imaged with scanning tunneling micrsocopy (STM) and the electrochemical properties were Investigated. It was found that SAMs composed of only norbornylogous bridges were crystalline-like, while in mixed SAMs, where the norbornylogous bridge was diluted, the ferrocene stood above the surface of the diluent because of the rigidity of the norbornylogous bridges and were homogeneously distributed across the surface. Further. the rate of electron transfer of the norbornylogous bridges was observed to be similar to an alkanethiol-derived ferrocene whose construct was designed to be as close as possible to that of the norbornylogous bridge. Finally, the rate of electron transfer for the norbornylogous bridges in a diluted SAM was slower With it hydroxyl-terminated diluent. than with a methyl-terminated diluent.