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Evidence of Amine–CO 2 Interactions in Two Pillared‐Layer MOFs Probed by X‐ray Crystallography
Author(s) -
Hu XiaoLi,
Gong QiHan,
Zhong RongLin,
Wang XinLong,
Qin Chao,
Wang Hao,
Li Jing,
Shao KuiZhan,
Su ZhongMin
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201406495
Subject(s) - chemistry , supramolecular chemistry , adsorption , crystallography , molecule , metal organic framework , amine gas treating , selectivity , terephthalic acid , single crystal , crystal structure , inorganic chemistry , organic chemistry , catalysis , polyester
Two pillared‐layer metal–organic frameworks (MOFs; PMOF‐55 and NH 2 ‐PMOF‐55) based on 1,2,4‐triazole and terephthalic acid (bdc)/NH 2 ‐bdc ligands were assembled and display framework stabilities, to a certain degree, in both acid/alkaline solutions and toward water. They exhibit high CO 2 uptakes and selective CO 2 /N 2 adsorption capacities, with CO 2 /N 2 selectivity in the range of 24–27, as calculated by the ideal adsorbed solution theory method. More remarkably, the site and interactions between the host network and the CO 2 molecules were investigated by single‐crystal X‐ray diffraction, which showed that the main interaction between the CO 2 molecules and PMOF‐55 is due to multipoint supramolecular interactions of CH⋅⋅⋅O, C⋅⋅⋅O, and O⋅⋅⋅O. Amino functional groups were shown to enhance the CO 2 adsorption and identified as strong adsorption sites for CO 2 by X‐ray crystallography.