Submolecular control, spectroscopy and imaging of bond-selective chemistry in single functionalized molecules
Submolecular control, spectroscopy and imaging of bond-selective chemistry in single functionalized molecules
复制标题
单功能化分子中键选择性化学的亚分子控制、光谱学和成像
DOI：
10.1038/nchem.1488
复制
发表时间：
2013-01-01
期刊：
影响因子：
21.8
通讯作者：
Ho, Wilson
中科院分区：
文献类型：
--
作者：
Jiang, Ying;Huan, Qing;Ho, Wilson
化学中的关键挑战之一是在具有一系列不同官能团的复杂有机分子中选择性地断裂和形成键。在单分子水平上做到这一点，不仅提供了创造定制纳米级设备的机会，也为深入研究分子电子结构在个别反应中的变化提供了机会。在这里，我们使用扫描隧道显微镜(STM)来诱导吸附在NiAl(110)表面上的单个硫醇基PI共轭分子中一系列靶向的键解离和形成步骤。此外，在每个反应步骤中，通过空间分辨电子光谱测量了生成的物种的电子共振。具体地说，扫描隧道显微镜被用来裂解单个乙酰基，并通过操纵单个金原子形成金-S键。详细了解Au-S键及其非局域影响对于确定硫醇分子结中的电子输运是非常重要的。
One of the key challenges in chemistry is to break and form bonds selectively in complex organic molecules that possess a range of different functional groups. To do this at the single-molecule level not only provides an opportunity to create custom nanoscale devices, but offers opportunities for the in-depth study of how the molecular electronic structure changes in individual reactions. Here we use a scanning tunnelling microscope (STM) to induce a sequence of targeted bond dissociation and formation steps in single thiol-based pi-conjugated molecules adsorbed on a NiAl(110) surface. Furthermore, the electronic resonances of the resulting species were measured by spatially resolved electronic spectroscopy at each reaction step. Specifically, the STM was used to cleave individual acetyl groups and to form Au-S bonds by manipulating single Au atoms. A detailed understanding of the Au-S bond and its non-local influence is fundamentally important for determining the electron transport in thiol-based molecular junction.