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首页> 外文期刊>The Journal of Chemical Physics >Direct observation of the conformational transitions of single pyridine molecules on a Ag(110) surface induced by long-range repulsive intermolecular interactions
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Direct observation of the conformational transitions of single pyridine molecules on a Ag(110) surface induced by long-range repulsive intermolecular interactions

机译：直接观察由远程排斥分子相互作用诱导的Ag（110）表面上单吡啶分子的构象过渡

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摘要

The transition between two conformations of pyridine molecules adsorbed on a Ag(110) surface at 13 K was investigated by performing single-molecule manipulation at a very low coverage and the track-imaging of pyridines for various surface coverages using a variable low-temperature scanning tunneling microscope. A single tilted conformer was converted to an upright conformer when another coadsorbed tilted pyridine molecule approached to within similar to 2 nm. The conversion probability depends on the molecular separation. The tilted conformers that are prevalent at a very low coverage were converted to upright conformers with an increasing surface coverage. The minimum molecular separation before this transition is induced was determined to be 2.2 nm using molecular track-imaging and statistical analysis of the pyridine separation as a function of the molecular coverage. The conformation transition was attributed to substrate-mediated long-range repulsive interactions between the pyridine molecules, which are produced by charge redistribution that occurs upon pyridine adsorption on the silver surface. Published by AIP Publishing.
机译：通过在非常低的覆盖范围内进行单分子操纵和使用可变低温扫描的各种表面覆盖物进行单分子操作，研究了在13K上吸附在Ag（110）表面上的吡啶分子的两种吡啶分子的过渡。隧道显微镜。当接近2nm的另一个辅作吸附的倾斜的吡啶分子时，将单个倾斜的构象剂转化为直立的构象。转化概率取决于分子分离。在非常低的覆盖范围内普遍的倾斜的赋实器被转换成具有增加的表面覆盖率的直立构象。在诱导该转变之前的最小分子分离，测定使用分子跟踪成像和吡啶分离的统计分离为2.2nm。作为分子覆盖的函数。构象转变归因于吡啶分子之间的基质介导的远程排斥相互作用，其通过电荷再分布产生，所述电荷再分布在银表面上的吡啶吸附时发生。通过AIP发布发布。

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