Wang Yi, Miao Xinrui, Deng Wenli, Brisse Romain, Jousselme Bruno, Silly Fabien
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
Université Paris-Saclay, CEA, CNRS, NIMBE, LICSEN, F-91191 Gif sur Yvette, France.
Nanomaterials (Basel). 2022 Feb 25;12(5):775. doi: 10.3390/nano12050775.
The trapping of coronene and zinc phthalocyanine (ZnPc) molecules at low concentration by a two-dimensional self-assembled nanoarchitecture of a push-pull dye is investigated using scanning tunneling microscopy (STM) at the liquid-solid interface. The push-pull molecules adopt an L-shaped conformation and self-assemble on a graphite surface into a hydrogen-bonded Kagomé network with porous hexagonal cavities. This porous host-structure is used to trap coronene and ZnPc guest molecules. STM images reveal that only 11% of the Kagomé network cavities are filled with coronene molecules. In addition, these guest molecules are not locked in the host-network and are desorbing from the surface. In contrast, STM results reveal that the occupancy of the Kagomé cavities by ZnPc evolves linearly with time until 95% are occupied and that the host structure cavities are all occupied after few hours.
利用扫描隧道显微镜（STM）在液-固界面研究了推拉染料的二维自组装纳米结构对低浓度的蔻和锌酞菁（ZnPc）分子的捕获情况。推拉分子呈L形构象，并在石墨表面自组装成具有多孔六边形空洞的氢键连接的 Kagomé 网络。这种多孔主体结构用于捕获蔻和 ZnPc 客体分子。STM 图像显示，只有 11% 的 Kagomé 网络空洞被蔻分子填充。此外，这些客体分子并未锁定在主体网络中，而是从表面解吸。相比之下，STM 结果显示，ZnPc 对 Kagomé 空洞的占有率随时间呈线性变化，直至 95% 被占据，并且在几小时后主体结构空洞全部被占据。
