Triptycene-Based Porous Chalcogen-Bonded Organic Frameworks
Wei Yang, Rong Jiang, Chao Liu, Baoqiu Yu, Xue Cai, Hailong Wang
Abstract
Two chalcogen-bonded organic frameworks (denoted as CBOFs), CBOF-1 and CBOF-2, have been constructed by the self-assembly of a custom-made triptycenetris(2,1,3-benzoselendiazole) (TTB) as an organic building block. As revealed by the results of single crystal X-ray diffraction analysis, the combination of chalcogen bonding and Se···π interactions was conductive to the structural porosity of the obtained two compounds. In particular, CBOF-1 exhibited a 3D 4-connected lvt topological framework with TTB simplified as the 4-connected node. The open pore channels of CBOF-1 possessed a pore size of 4.2 Å, of which the theoretical accessible pore volume occupied 35.6% of the total volume. Structural porosity of CBOF-2 was filled by tetrahydrofuran molecules, and the accessible volume percentage was calculated for 29.5%. Due to the flexible structure, degassed CBOF-1 displayed permanent porosity using carbon dioxide as an absorbate at 196 K. In the present study, a new kind of porous organic framework with permanent porosity has been revealed.