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共价有机框架的主干中注入假轮烷来划分其内层间空间
作者:小柯机器人 发布时间:2020/11/5 16:16:37

新加坡国立大学Kian Ping Loh研究团队在共价有机框架中的主干中注入假轮烷来划分其内层间空间。相关论文发表在2020年11月2日的《自然-化学》。

单层或多层共价有机框架(COFs)是一种具有吸引力的二维材料平台,通过对COF的合理设计能够实现其功能和孔隙的定制。但是,尽管人们已经合成了各种各样的层状COFs,切割它们的层间堆积以获得均匀厚度的COF仍然面临挑战。

在该工作中,研究人员将假轮烷注入到COFs的主干中来划分其层间空间。以冠醚为基元的大环主体被嵌入到二元或四元酰基肼基块中。与三羟甲基醛连接剂的反应形成了基于酰肼的层状COFs,其中一个基面由一层组成,或者是由其四元体对应物共价键连接在一起的两个相邻层组成。当引入紫精穿线装置时,主客体复合物的形成促进了COFs分别自动剥离成单层或双层。

附:英文原文

Title: Partitioning the interlayer space of covalent organic frameworks by embedding pseudorotaxanes in their backbones

Author: 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&Volume: 2020-11-02

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.

DOI: 10.1038/s41557-020-00562-5

Source: https://www.nature.com/articles/s41557-020-00562-5

期刊信息

Nature Chemistry:《自然—化学》,创刊于2009年。隶属于施普林格·自然出版集团,最新IF:21.687
官方网址:https://www.nature.com/nchem/
投稿链接:https://mts-nchem.nature.com/cgi-bin/main.plex