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Single-Crystal Structure of a Covalent Organic Framework

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posted on 06.11.2013, 00:00 authored by Yue-Biao Zhang, Jie Su, Hiroyasu Furukawa, Yifeng Yun, Felipe Gándara, Adam Duong, Xiaodong Zou, Omar M. Yaghi
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.