Observation of Interpenetration Isomerism in Covalent Organic Frameworks
Observation of Interpenetration Isomerism in Covalent Organic Frameworks
复制标题
共价有机框架中互穿异构现象的观察
DOI：
10.1021/jacs.8b03169
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发表时间：
2018-06-06
影响因子：
15
通讯作者：
Wang, Wei
中科院分区：
文献类型：
--
作者：
Ma, Tianqiong;Li, Jian;Wang, Wei
本文报道了共价有机框架（COFs）中互穿异构的第一个例子。COF-300是一种众所周知的三维（3D） COF， 2009年由Yaghi基团合成并表征为5重互穿金刚石结构（dia-cS拓扑）。我们发现，在报道的合成过程之前添加一个老化过程可以形成一个互穿异构体，dia-c7 COF-300。通过粉末x射线衍射和旋转电子衍射分析，鉴定了该异构体的7重互穿金刚石结构。此外，我们提出了一个通用公式，仅从单元胞参数和有机连接体的长度就可以准确地确定基于介质的COFs的互穿度。这项工作不仅为穿透间异构提供了一个新的例子，而且为三维COFs的进一步发展提供了新的见解。
We report herein the first example of interpenetration isomerism in covalent organic frameworks (COFs). As a well-known three-dimensional (3D) COF, COF-300 was synthesized and characterized by the Yaghi group in 2009 as a 5-fold interpenetrated diamond structure (dia-cS topology). We found that adding an aging process prior to the reported synthetic procedure afforded the formation of an interpenetration isomer, dia-c7 COF-300. The 7-fold interpenetrated diamond structure of this new isomer was identified by powder Xray diffraction and rotation electron diffraction analyses. Furthermore, we proposed a universal formula to accurately determine the number of interpenetration degrees of dia-based COFs from only the unit cell parameters and the length of the organic linker. This work not only provides a novel example to the category of interpenetration isomerism but also provides new insights for the further development of 3D COFs.