Yin Qi, Li Yu-Lin, Li Lan, Lü Jian, Liu Tian-Fu, Cao Rong
Department of Chemistry , University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China.
State Key Laboratory of Structural Chemistry , Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou , Fujian 350002 , P. R. China.
ACS Appl Mater Interfaces. 2019 May 15;11(19):17823-17827. doi: 10.1021/acsami.9b03696. Epub 2019 May 1.
Herein we construct a novel three-dimension (3D) hydrogen-bonded organic framework (PFC-2) with a hierarchical meso-microporous structure, which possesses the largest open channels relative to all known HOFs and exhibits highly selective separation of acetylene and ethylene versus methane at ambient atmosphere. Comparison on the adsorption behaviors of PFC-2 and an analogue structure PFC-1 clearly shows that the extensively existed unpaired hydrogen bond acceptor C═O groups in PFC-2 dramatically increase the affinity between gas molecules and frameworks, resulting in high isosteric heats of adsorption ( Q) and better selectivity toward C hydrocarbons to methane. The study presented here demonstrated an effective strategy to optimize gas adsorption/separation performance of HOF materials.
在此，我们构建了一种具有分级介观-微孔结构的新型三维（3D）氢键有机框架（PFC-2），相对于所有已知的氢键有机框架，它拥有最大的开放通道，并且在环境大气中对乙炔和乙烯相对于甲烷表现出高度选择性分离。PFC-2与类似结构PFC-1吸附行为的比较清楚地表明，PFC-2中广泛存在的未配对氢键受体C═O基团显著增加了气体分子与框架之间的亲和力，导致高吸附等量热（Q）以及对碳氢化合物相对于甲烷的更好选择性。此处提出的研究展示了一种优化氢键有机框架材料气体吸附/分离性能的有效策略。
