Nature of Electron Transport by Pyridine-Based Tripodal Anchors: Potential for Robust and Conductive Single-Molecule Junctions with Gold Electrodes
Nature of Electron Transport by Pyridine-Based Tripodal Anchors: Potential for Robust and Conductive Single-Molecule Junctions with Gold Electrodes
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DOI：
10.1021/ja109577f
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发表时间：
2011-03-09
影响因子：
15
通讯作者：
Aso, Yoshio
中科院分区：
文献类型：
--
作者：
Ie, Yutaka;Hirose, Tomoya;Aso, Yoshio
我们设计并合成了一种基于吡啶的三脚架锚单元，用于与金电极构建单分子结。三脚架锚定到金表面的优点是明确地证明了循环伏安测量。X射线光电子能谱（XPS）测量表明吡啶的A轨道参与了三脚架锚单元在金表面的物理吸附。用改进的扫描隧道显微镜技术测量了由三脚架锚和二苯乙炔组成的单分子结的电导，并成功地确定了电导为5 +/- 1 × 10（-4）G（0.最后，通过从头计算分析了体系的输运机制，预测了锚分子π轨道的参与.三脚架结构预计将形成一个强大的连接，并预测吡啶实现π通道电传输。
We have designed and synthesized a pyridine-based tripodal anchor unit to construct a single-molecule junction with a gold electrode. The advantage of tripodal anchoring to a gold surface was unambiguously demonstrated by cyclic voltanunetry measurements. X-ray photoelectron spectroscopy measurements indicated that the A orbital of pyridine contributes to the physical adsorption of the tripodal anchor unit to the gold surface, The conductance of a single-molecule junction that consists of the tripodal anchor and diphenyl acetylene was measured by modified scanning tunneling microscope techniques and successfully determined to be 5 +/- 1 x 10(-4) G(0.) Finally, by analyzing the transport mechanism based on ab initio calculations, the participation of the pi orbital of the anchor moieties was predicted. The tripodal structure is expected to form a robust junction, and pyridine is predicted to achieve pi-channel electric transport.