Han Bo, Li Zhihai, Li Chen, Pobelov Ilya, Su Guijin, Aguilar-Sanchez Rocio, Wandlowski Thomas
Institute of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, 3012, Berne, Switzerland.
Top Curr Chem. 2009;287:181-255. doi: 10.1007/128_2008_152.
Structure formation and self-assembly of physisorbed and chemisorbed organic monolayers will be describedon electrified solid-liquid interfaces employing in-situ scanning tunneling microscopy (STM) and surface-enhancedinfrared spectroscopy (SEIRAS) in combination with electrochemical techniques. We present first a casestudy on self-assembly by directional hydrogen bonding and its interplay with the electrode potential choosingaromatic carboxylic acids, with an emphasis on 1,3,5-benzene-tricarboxylic acid (TMA). Structure and electricalcharacteristics of chemisorbed organic monolayers involving the formation of covalent bonds with the substratesurface will be discussed for a series of 4-methyl-4'-(n-mercaptoalkyl)biphenylson Au(111) electrodes. In an attempt to explore single molecule properties, such as charge transport andredox-mediated tunneling, we subsequently introduce an STM-based technique to construct symmetric and asymmetricmetal/(single) molecule/metal junctions. Employing α,ω-alkanedithiols and redox-active derivatives of viologens we demonstratenovel transport and single molecule electrochemical studies, which bear unique novel perspectives for fundamentalas well as applied investigations.
利用原位扫描隧道显微镜（STM）和表面增强红外光谱（SEIRAS）并结合电化学技术，将描述物理吸附和化学吸附有机单层在带电固液界面上的结构形成和自组装。我们首先通过定向氢键作用及其与电极电位的相互作用，以芳香族羧酸为研究对象，重点研究1,3,5-苯三甲酸（TMA），进行自组装的案例研究。对于一系列在Au(111)电极上的4-甲基-4'-(n-巯基烷基)联苯，将讨论涉及与基底表面形成共价键的化学吸附有机单层的结构和电学特性。为了探索单分子性质，如电荷传输和氧化还原介导的隧穿，我们随后引入一种基于STM的技术来构建对称和不对称的金属/（单）分子/金属结。利用α,ω-链烷二硫醇和紫精的氧化还原活性衍生物，我们展示了新颖的传输和单分子电化学研究，这为基础研究和应用研究带来了独特的新视角。
