Department of Physics, Tsinghua University, Beijing, China.
J Chem Phys. 2011 Apr 21;134(15):154703. doi: 10.1063/1.3579493.
The self-assembled structure of submonolayer manganese phthalocyanine (MnPc) on Pb(111) surface is investigated by using low-temperature scanning tunneling microscopy (STM). A "holelike" superlattice, which is superimposed on the self-assembled nearly quadratic network, is observed. High resolution STM images reveal that there are two distinct azimuthal orientations of MnPc molecules. It is found that by taking the two different orientations the self-assembly can further be optimized energetically by maximizing intermolecular orbital overlapping. It is this intralayer energy minimization process that leads to the characteristic holelike superlattice.
利用低温扫描隧道显微镜（STM）研究了亚单层锰酞菁（MnPc）在 Pb(111)表面的自组装结构。观察到一个“孔状”超晶格，叠加在自组装的近方形网络上。高分辨率 STM 图像显示，MnPc 分子有两种不同的方位。研究发现，通过采用两种不同的取向，可以通过最大化分子间轨道重叠来进一步优化自组装的能量。正是这种层内能量最小化过程导致了特征孔状超晶格的形成。
