期刊
ACS NANO
卷 11, 期 11, 页码 11694-11700出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b06871
关键词
surface covalent organic frameworks; Kagome; scanning tunneling microscopy; monomer concentration; dynamic covalent bonds
类别
资金
- National Natural Science Foundation of China [21433011, 91527303]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB12020100]
- National Basic Research Program [2017YFA024702]
Polymorphic single-layered covalent organic frameworks (sCOFs) via on-surface synthesis have been investigated by employing the tetradentate monomer 1,3,6,8-tetrakis(p-formylphenyl)pyrene with D-2h symmetry and ditopic linear diamine building blocks. Three kinds of well-ordered sCOFs, including rhombus, parallelogram, and Kagome networks, are observed on the graphite surface by scanning tunnel microscopy. The pore size and periodicity of sCOFs are tunable by employing diamine monomers with different lengths. Statistical analysis reveals that two types of quadrate networks are preferred at high concentration, whereas the occupancy of Kagome networks increases at low concentration. This trend can be understood by the differences in the network density of three kinds of networks. The reversibility and the self-sorting ability of the dynamic covalent reaction make it possible to control the polymorphic distribution similar to the principle demonstrated in supramolecular self-assembly.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据