Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41557-020-00562-5
Title: Partitioning the Interlayer Space in Covalent Organic Frameworks by Embedding Pseudorotaxane Moieties
Authors: Xing Li 
Hai-Sen Xu 
Kai Leng 
See Wee Chee 
Xiaoxu Zhao 
Noopur Jain 
Hai Xu 
Jingsi Qiao 
Qiang Gao 
In-Hyeok Park 
Su Ying Quek 
Utkur Mirsaidov 
Kian Ping Loh 
Issue Date: 2-Nov-2020
Publisher: Nature Research
Citation: Xing Li, Hai-Sen Xu, Kai Leng, See Wee Chee, Xiaoxu Zhao, Noopur Jain, Hai Xu, Jingsi Qiao, Qiang Gao, In-Hyeok Park, Su Ying Quek, Utkur Mirsaidov, Kian Ping Loh (2020-11-02). Partitioning the Interlayer Space in Covalent Organic Frameworks by Embedding Pseudorotaxane Moieties. Nature Chemistry 12 : 1115 - 1122. ScholarBank@NUS Repository. https://doi.org/10.1038/s41557-020-00562-5
Abstract: Mono- or few-layer sheets of covalent organic frameworks (COFs) represent an attractive platform of two-dimensional materials that hold promise for tailor-made functionality and pores, through judicious design of the COF building blocks. But although a wide variety of layered COFs have been synthesized, cleaving their interlayer stacking to obtain COF sheets of uniform thickness has remained challenging. Here, we have partitioned the interlayer space in COFs by incorporating pseudorotaxane units into their backbones. Macrocyclic hosts based on crown ethers were embedded into either a ditopic or a tetratopic acylhydrazide building block. Reaction with a tritopic aldehyde linker led to the formation of acylhydrazone-based layered COFs in which one basal plane is composed of either one layer, in the case of the ditopic macrocyclic component, or two adjacent layers covalently held together by its tetratopic counterpart. When a viologen threading unit is introduced, the formation of a host–guest complex facilitates the self-exfoliation of the COFs into crystalline monolayers or bilayers, respectively.
Source Title: Nature Chemistry
URI: https://scholarbank.nus.edu.sg/handle/10635/187061
ISSN: 17554330
DOI: 10.1038/s41557-020-00562-5
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