Frauhammer Timo, Gerhard Lukas, Edelmann Kevin, Lindner Marcin, Valášek Michal, Mayor Marcel, Wulfhekel Wulf
Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), D-76021 Karlsruhe, Germany.
Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology (KIT), D-76021 Karlsruhe, Germany.
Phys Chem Chem Phys. 2021 Mar 4;23(8):4874-4881. doi: 10.1039/d0cp06146h.
Functional molecular groups mounted on specific foot structures are ideal model systems to study intermolecular interactions, due to the possibility to separate the functionality and the adsorption mechanism. Here, we report on the rotational switching of a thioacetate group mounted on a tripodal tetraphenylmethane (TPM) derivative adsorbed in ordered islands on a Au(111) surface. Using low temperature scanning tunnelling microscopy, individual freestanding molecular groups of the lattice can be switched between two bistable orientations. The functional dependence of this rotational switching on the sample bias and tip-sample distance allows us to model the energy landscape of this molecular group as an electric dipole in the electric field of the tunnelling junction. As expected for the interaction of two dipoles, we found states of neighbouring molecules to be correlated.
由于能够将功能与吸附机制分离，安装在特定足部结构上的功能性分子基团是研究分子间相互作用的理想模型系统。在此，我们报告了吸附在Au(111)表面有序岛中的三脚架四苯基甲烷(TPM)衍生物上的硫代乙酸酯基团的旋转切换。使用低温扫描隧道显微镜，晶格中的单个独立分子基团可以在两个双稳态取向之间切换。这种旋转切换对样品偏压和针尖-样品距离的功能依赖性使我们能够将该分子基团的能量景观建模为隧道结电场中的电偶极子。正如两个偶极子相互作用所预期的那样，我们发现相邻分子的状态是相关的。
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