Multiple molecular interactions between alkyl groups and dissociated bromine atoms on Ag(111)
Multiple molecular interactions between alkyl groups and dissociated bromine atoms on Ag(111)
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Ag(111) 上烷基和解离溴原子之间的多重分子相互作用
DOI：
10.1039/d2cp03198a
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发表时间：
2022
影响因子：
3.3
通讯作者：
Suzuki Takanori
中科院分区：
文献类型：
--
作者：
Kawai Shigeki;Sugawara Kazuma;Ma Yujing;Sun Kewei;Custance Oscar;Ishigaki Yusuke;Suzuki Takanori
多重分子间相互作用为表面分子组装提供了高度的可控性。在此，我们在超真空条件下，通过在Ag（111）表面沉积两种不同长度的烷基（C4和C8）的11，11，12，12-四溴-1，4，5，8-四氮杂-9，10-蒽醌二甲烷衍生物，形成了两种分子网络。在低温下，用高分辨率扫描隧道显微镜研究了C-Br键断裂前后每个网络的详细结构。我们发现，高温退火的溴原子的扩散在形成溴介导的自组装中发挥了作用。在两种体系中，游离Br原子与烷基通过C-H-Br接触形成氢键，但烷基之间的货车范德华力强度不同，导致形成不同的结构.
Multiple intermolecular interactions offer a high degree of controllability of on-surface molecular assemblies. Here, two kinds of molecular networks were formed by depositing 11,11,12,12-tetrabromo-1,4,5,8-tetraaza-9,10-anthraquinodimethane derivatives with two different alkyl groups in length (C4 and C8) on clean Ag(111) surfaces under ultrahigh vacuum. The detailed structures of each network before and after the cleavage of the C–Br bonds were investigated with high-resolution scanning tunneling microscopy at low temperature. We found that the diffusion of the Br atoms by high-temperature annealing plays a role in the formation of Br-mediated self-assembly. While dissociated Br atoms interacted with alkyl groups by hydrogen bonding through C–H⋯Br contacts in both systems, the different strengths of the van der Waals interactions between the alkyl groups resulted in the formation of different structures.