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首页> 外文期刊>Nanotechnology >Structural changes in a Schiff base molecular assembly initiated by scanning tunneling microscopy tip
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Structural changes in a Schiff base molecular assembly initiated by scanning tunneling microscopy tip

机译：通过扫描隧道显微镜尖端引发的席夫碱分子组装体中的结构变化

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摘要

We report the controlled self-organization and switching of newly designed Schiff base (E)-4-((4-(phenylethynyl) benzylidene) amino) benzenethiol (EPBB) molecules on a Au (111) surface at room temperature. Scanning tunneling microscopy and spectroscopy (STM/STS) were used to image and analyze the conformational changes of the EPBB molecules. The conformational change of the molecules was induced by using the STM tip while increasing the tunneling current. The switching of a domain or island of molecules was shown to be induced by the STM tip during scanning. Unambiguous fingerprints of the switching mechanism were observed via STM/STS measurements. Surface-enhanced Raman scattering was employed, to control and identify quantitatively the switching mechanism of molecules in a monolayer. Density functional theory calculations were also performed in order to understand the microscopic details of the switching mechanism. These calculations revealed that the molecular switching behavior stemmed from the strong interaction of the EPBB molecules with the STM tip. Our approach to controlling intermolecular mechanics provides a path towards the bottom-up assembly of more sophisticated molecular machines.
机译：我们报告在室温下Au（111）表面上新设计的席夫碱（E）-4-（（4-（苯基乙炔基亚苄基）氨基）苯硫醇（EPBB）分子的受控自组织和切换。扫描隧道显微镜和光谱法（STM / STS）用于成像和分析EPBB分子的构象变化。通过使用STM尖端诱导分子的构象变化，同时增加隧穿电流。显示在扫描过程中，STM尖端诱导了分子域或岛的切换。通过STM / STS测量观察到切换机构的明确指纹。采用表面增强拉曼散射，以控制和定量确定单层分子的转换机制。为了理解开关机构的微观细节，还进行了密度泛函理论计算。这些计算表明，分子转换行为源于EPBB分子与STM尖端的强相互作用。我们控制分子间力学的方法为更复杂的分子机器的自下而上组装提供了一条途径。

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