Switching of Charge Transport Pathways via Delocalization Changes in Single-Molecule Metallacycles Junctions
Switching of Charge Transport Pathways via Delocalization Changes in Single-Molecule Metallacycles Junctions
复制标题
通过单分子金属环结的离域变化来切换电荷传输路径
DOI：
10.1021/jacs.7b06400
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发表时间：
2017-10-18
影响因子：
15
通讯作者：
Xia, Haiping
中科院分区：
文献类型：
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作者：
Li, Ruihao;Lu, Zhengyu;Xia, Haiping
为了探索金属-芳香族化合物结构单元的电荷传输，合成了3种金属杂环配合物，并利用机械可控的断裂结技术表征了它们的单分子电导.发现含磷基团的金属配合物结的电导比不含磷基团的金属配合物结的电导高1个数量级以上。X射线衍射和紫外-可见吸收光谱表明，连接的鏻基团使金属杂环更加离域，这缩短了优选的电荷陷阱：端口路径，并显着增强了单分子电导。本工作揭示了金属芳香化合物的离域作用可以用来改变单分子结的电荷传输路径，从而显著地调节电荷传输能力。
To explore the charge transport through metalla-aromatics building blocks, three metallacycles complexes were synthesized, and their single-molecule conductances were characterized by using mechanically controllable break junction technique. It is found that the conductance of the metallacycles junction with phosphonium group is more than 1 order of magnitude higher than that without phosphonium group. X-ray diffraction and UV-vis absorption spectroscopy suggested that the attached phosphonium group makes metallacycles more delocalized, which shortened the preferred, charge traps: port pathway and significantly enhanced the single molecule conductance. This work revealed that the delocalization of metalla-aromatics could be used to switch the charge transport pathway of single-molecule junctions and thus tune the charge transport abilities significantly.