The Institute of Scientific and Industrial Research (ISIR), Osaka University, 8-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
J Am Chem Soc. 2011 Mar 9;133(9):3014-22. doi: 10.1021/ja109577f. Epub 2011 Feb 10.
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 voltammetry measurements. X-ray photoelectron spectroscopy measurements indicated that the π 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 × 10(-4)G(0). Finally, by analyzing the transport mechanism based on ab initio calculations, the participation of the π orbital of the anchor moieties was predicted. The tripodal structure is expected to form a robust junction, and pyridine is predicted to achieve π-channel electric transport.
我们设计并合成了一种基于吡啶的三脚架锚定单元，用于构建与金电极的单分子结。通过循环伏安法测量，明确证明了三脚架对金表面的锚固优势。X 射线光电子能谱测量表明，吡啶的π轨道有助于三脚架锚定单元对金表面的物理吸附。通过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，并成功确定为 5 ± 1 × 10(-4)G(0)。最后，通过基于从头算计算的传输机制分析，预测了锚定部分的π轨道的参与。预计三脚架结构将形成一个坚固的结，并且吡啶有望实现π-通道的电子输运。
