Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 144, Issue 41, Pages 18784-18789Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c08468
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Funding
- Natural Science Foundation of China [22071078, 92156012]
- Program for JLU Science and Technology Innovative Research Team (JLUSTIRT) [2019TD-36]
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In this study, a soft imine-based 2D covalent organic framework (S-COF) with a compacted honeycomb topology was synthesized. The compacted topological structure was characterized using various techniques. This research opens up new possibilities for the development of covalent organic frameworks.
In this contribution, we report the synthesis of an imine-based soft 2D covalent organic framework (S-COF) with compacted honeycomb topology via inveterately selecting a helically folded ditopic flexible linker and a trigonal building block. In contrast to various topological structures of rigid monomer-based COFs (R-COFs) reported so far, owing to the presence of flexible skeleton S-COF can spontaneously form a compacted and nonporous topological structure via intramolecular pi stacking of presupposed honeycomb-like topology. Such S-COFs with a compacted honeycomb topology have neither been proposed theoretically nor been achieved experimentally. The compacted topological structure of 2D S-COF was clearly characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM), powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR), and circular dichroism (CD) measurements. This study opens a new window to the development of S-COFs and will significantly expand the scope of COF materials.
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