TY - JOUR
T1 - Intramolecular Hydrogen Bonding-Based Topology Regulation of Two-Dimensional Covalent Organic Frameworks
AU - Peng, Yongwu
AU - Zhu, Chongzhi
AU - Chen, Bo
AU - Zhang, Zhicheng
AU - Lai, Zhuangchai
AU - Zhang, Xiao
AU - Tan, Chaoliang
AU - Han, Yu
AU - Zhu, Yihan
AU - Zhang, Hua
N1 - Funding Information:
This work was supported by MOE under AcRF Tier 2 (MOE2016-T2-2-103; MOE2017-T2-1-162) in Singapore. Y.Z. acknowledges financial support from the National Natural Science Foundation of China (grant no. 21771161) and the Thousand Talents Program for Distinguished Young Scholars. We acknowledge the Facility for Analysis, Characterization, Testing and Simulation, Nanyang Technological University, Singapore, for the use of their electron microscopy (and/or X-ray) facilities. H.Z. is grateful for financial support from the ITC via the Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM) and the start-up grant (project no. 9380100) and grants (project nos. 9610478 and 1886921) from the City University of Hong Kong.
Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/7/29
Y1 - 2020/7/29
N2 - Creating molecular networks with different topologies using identical molecular linkers is fundamentally important but requires precise chemistry control. Here, we propose an effective strategy to regulate the network topologies of two-dimensional (2D) covalent organic frameworks (COFs) through the conformational switching of molecular linkages. By simply altering the substituents of an identical molecular linker, the topology-selective synthesis of two highly crystalline 2D COFs can be readily achieved. Their distinct crystal structures are observed and determined by low-dose, high-resolution transmission electron microscopy imaging, indicating that the driving force for linkage conformation switching is intramolecular hydrogen bonding. Our strategy would greatly diversify the COF topologies and enable vast postsynthetic modifications such as boron complexation, endowing these structures with a unique optical property such as fluorescence turn on and aggregation-induced emission.
AB - Creating molecular networks with different topologies using identical molecular linkers is fundamentally important but requires precise chemistry control. Here, we propose an effective strategy to regulate the network topologies of two-dimensional (2D) covalent organic frameworks (COFs) through the conformational switching of molecular linkages. By simply altering the substituents of an identical molecular linker, the topology-selective synthesis of two highly crystalline 2D COFs can be readily achieved. Their distinct crystal structures are observed and determined by low-dose, high-resolution transmission electron microscopy imaging, indicating that the driving force for linkage conformation switching is intramolecular hydrogen bonding. Our strategy would greatly diversify the COF topologies and enable vast postsynthetic modifications such as boron complexation, endowing these structures with a unique optical property such as fluorescence turn on and aggregation-induced emission.
UR - https://www.scopus.com/pages/publications/85089617490
U2 - 10.1021/jacs.0c05596
DO - 10.1021/jacs.0c05596
M3 - Journal article
C2 - 32627561
AN - SCOPUS:85089617490
SN - 0002-7863
VL - 142
SP - 13162
EP - 13169
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 30
ER -