Single-Crystal Structure of a Covalent Organic Framework

The crystal structure of a new covalent
organic framework, termed
COF-320, is determined by single-crystal 3D electron diffraction using
the rotation electron diffraction (RED) method for data collection.
The COF crystals are prepared by an imine condensation of tetra-(4-anilyl)­methane
and 4,4′-biphenyldialdehyde in 1,4-dioxane at 120 °C to
produce a highly porous 9-fold interwoven diamond net. COF-320 exhibits
permanent porosity with a Langmuir surface area of 2400 m2/g and a methane total uptake of 15.0 wt % (176 cm3/cm3) at 25 °C and 80 bar. The successful determination of
the structure of COF-320 directly from single-crystal samples is an
important advance in the development of COF chemistry.

一项新型共价有机框架（COF-320）的晶体结构通过单晶三维电子衍射技术得以确定，该技术采用旋转电子衍射（RED）方法进行数据采集。该COF晶体由四-(4-烷基)甲烷与4,4'-联苯二醛在1,4-二氧杂环己烷中于120°C下通过亚胺缩合反应制备而成，从而形成了一种具有高度多孔性的九重交织钻石网。COF-320表现出永久性多孔性，其Langmuir比表面积为2400 m2/g，在25°C和80 bar条件下，甲烷总吸附量为15.0 wt %（176 cm3/cm3）。直接从单晶样品成功确定COF-320的结构，在共价有机框架化学的发展中具有重要意义。