Synthesis, structure and gas adsorption properties of a microporous metal–organic framework assembled from a semi-rigid tripodal carboxylic acid ligand

Abstract The design, synthesis, and structural characterization of a new cubic three-dimensional microporous metal–organic framework featuring a semi-rigid tripodal carboxylic acid ligand, 4,4′-((5-carboxy-1,3-phenylene)bis(oxy))dibenzoic acid (H 3 cpbda), is reported. Single-crystal X-ray diffraction analysis indicates that compound 1 possesses a novel (3,4,4)-connected network with the point symbol of {8 3 } 4 {8 4 ·10 2 } 2 {8 6 }. In the framework of 1 , there co-exist two types of 1D channels with different pore size (15 A and 4.5 A). The pore characteristics and gas sorption properties of this compound were investigated both at cryogenic temperatures and room temperature by experimentally measuring N 2 and CO 2 sorption isotherms. These studies show that compound 1 is highly porous with a pore volume of 0.98 cm 3 /g and BET surface of 1926 cm 3 /g. In addition, the activated 1 also shows excellent CO 2 storage capacity around room temperature.