Hu Xiao-Li, Gong Qi-Han, Zhong Rong-Lin, Wang Xin-Long, Qin Chao, Wang Hao, Li Jing, Shao Kui-Zhan, Su Zhong-Min
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.
Chemistry. 2015 May 4;21(19):7238-44. doi: 10.1002/chem.201406495. Epub 2015 Mar 20.
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.
基于1,2,4-三唑和对苯二甲酸（bdc）/氨基对苯二甲酸（NH₂-bdc）配体的两种柱状层状金属有机框架材料（MOFs；PMOF-55和NH₂-PMOF-55）被合成出来，并且在一定程度上，在酸性/碱性溶液以及面对水时都表现出框架稳定性。它们展现出高的二氧化碳吸附量以及选择性的二氧化碳/氮气吸附能力，通过理想吸附溶液理论方法计算，二氧化碳/氮气选择性在24至27的范围内。更值得注意的是，通过单晶X射线衍射研究了主体网络与二氧化碳分子之间的位点和相互作用，结果表明二氧化碳分子与PMOF-55之间的主要相互作用是由于C-H⋅⋅⋅O、C⋅⋅⋅O和O⋅⋅⋅O的多点超分子相互作用。氨基官能团被证明增强了二氧化碳吸附，并且通过X射线晶体学被确定为二氧化碳的强吸附位点。
