Abstract
An anionic cage-type metal–organic framework, {(Me2NH2)5[Mn4Cl(BTB)4(H2O)4](DMF)2(EtOH)7}n (1, DMF=N,N-Dimethylformamide), has been successfully prepared by the reaction of MnCl2 with trigonal planar 4,4′,4″-benzene-1,3,5-triyl-tri-benzoic acid (H3BTB) ligand under solvothermal conditions. Its structure was characterized by single-crystal X-ray diffraction techniques, which reveal that it is constructed by cross-linking BTB3− ligands with the in situ-generated square-planar [Mn4Cl]7+ secondary building units. The free space of 1 is formed by packing of octahedral and cuboctahedral cages, and the overall framework exhibits a 2-fold interpenetrated the-type topology. N2 adsorption isotherm at 77K confirmed the permanent porosities of the activated 1 and the variable-temperature adsorption measurements of CO2 and CH4 revealed its high adsorption abilities of CO2 over CH4 at room temperature.
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