Bi Liya, Jamnuch Sasawat, Chen Amanda, Do Alexandria, Balto Krista P, Wang Zhe, Zhu Qingyi, Wang Yufei, Zhang Yanning, Tao Andrea R, Pascal Tod A, Figueroa Joshua S, Li Shaowei
Department of Chemistry and Biochemistry, University of California, San Diego, California 92093-0309, United States.
Program in Materials Science and Engineering, University of California, San Diego, California 92093-0418, United States.
J Am Chem Soc. 2024 May 1;146(17):11764-11772. doi: 10.1021/jacs.4c00002. Epub 2024 Apr 16.
Direct imaging of single molecules at nanostructured interfaces is a grand challenge with potential to enable new, precise material architectures and technologies. Of particular interest are the structural morphology and spectroscopic signatures of the adsorbed molecule, where modern probes are only now being developed with the necessary spatial and energetic resolution to provide detailed information at the molecule-surface interface. Here, we directly characterize the adsorption of individual -terphenyl isocyanide ligands on a reconstructed Au(111) surface through scanning tunneling microscopy and inelastic electron tunneling spectroscopy. The site-dependent steric pressure of the various surface features alters the vibrational fingerprints of the -terphenyl isocyanides, which are characterized with single-molecule precision through joint experimental and theoretical approaches. This study provides molecular-level insights into the steric-pressure-enabled surface binding selectivity as well as its effect on the chemical properties of individual surface-binding ligands.
在纳米结构界面上对单分子进行直接成像，是一项极具挑战性的重大任务，它有可能催生全新的、精确的材料架构和技术。特别令人感兴趣的是吸附分子的结构形态和光谱特征，目前现代探针才刚刚开发出来，具备必要的空间和能量分辨率，能够在分子 - 表面界面提供详细信息。在这里，我们通过扫描隧道显微镜和非弹性电子隧道光谱，直接表征了单个对三联苯异腈配体在重构的Au(111)表面上的吸附情况。各种表面特征的位点依赖性空间压力改变了对三联苯异腈的振动指纹，通过联合实验和理论方法，以单分子精度对其进行了表征。这项研究提供了分子水平上对空间压力驱动的表面结合选择性及其对单个表面结合配体化学性质影响的见解。
