title: Evidence of Amine-CO2 Interactions in Two Pillared-Layer MOFs Probed by X-ray Crystallography.
abstract: Two pillared-layer metal-organic frameworks (MOFs; PMOF-55 and NH2 -PMOF-55) based on 1,2,4-triazole and terephthalic acid (bdc)/NH2 -bdc ligands were assembled and display framework stabilities, to a certain degree, in both acid/alkaline solutions and toward water. They exhibit high CO2 uptakes and selective CO2 /N2 adsorption capacities, with CO2 /N2 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 CO2 molecules were investigated by single-crystal X-ray diffraction, which showed that the main interaction between the CO2 molecules and PMOF-55 is due to multipoint supramolecular interactions of C-H⋅⋅⋅O, C⋅⋅⋅O, and O⋅⋅⋅O. Amino functional groups were shown to enhance the CO2 adsorption and identified as strong adsorption sites for CO2 by X-ray crystallography.
authors: Department of Chemistry, Northeast Normal University, Institute of Functional Material Chemistry, Key Lab of Polyoxometalate Science of Ministry of Education, Northeast Normal University, Changchun 130024, Jilin (P.R. China), Fax: (+86) 431-85684009.
authors: Xiao-Li
authors: XL
authors: Hu
authors: Qi-Han
authors: QH
authors: Gong
authors: Rong-Lin
authors: RL
authors: Zhong
authors: Xin-Long
authors: XL
authors: Wang
authors: Chao
authors: C
authors: Qin
authors: Hao
authors: H
authors: Wang
authors: Jing
authors: J
authors: Li
authors: Kui-Zhan
authors: KZ
authors: Shao
authors: Zhong-Min
authors: ZM
authors: Su
keywords: X-ray diffraction; adsorption; carbon dioxide; metal-organic frameworks; pillared-layer