A porous the -type metal-organic framework based on [Mn 4 Cl] 7 + clusters for selective gas sorption

Abstract An anionic cage-type metal–organic framework, {(Me 2 NH 2 ) 5 [Mn 4 Cl(BTB) 4 (H 2 O) 4 ](DMF) 2 (EtOH) 7 } n ( 1 , DMF =  N , N -Dimethylformamide), has been successfully prepared by the reaction of MnCl 2 with trigonal planar 4,4′,4″-benzene-1,3,5-triyl-tri-benzoic acid (H 3 BTB) ligand under solvothermal conditions. Its structure was characterized by single-crystal X-ray diffraction techniques, which reveal that it is constructed by cross-linking BTB 3 − ligands with the in situ -generated square-planar [Mn 4 Cl] 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. N 2 adsorption isotherm at 77 K confirmed the permanent porosities of the activated 1 and the variable-temperature adsorption measurements of CO 2 and CH 4 revealed its high adsorption abilities of CO 2 over CH 4 at room temperature.