| Affiliation: | 1. State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, 710072 P. R. China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, International Joint Research Laboratory of Nano-Micro Architecture Chemistry (NMAC), College of Chemistry, Jilin University, Changchun, 130012 P. R. China;2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, International Joint Research Laboratory of Nano-Micro Architecture Chemistry (NMAC), College of Chemistry, Jilin University, Changchun, 130012 P. R. China;3. Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado, 80309 USA |
| Abstract: | A new low-density pillar[6]arene-based SOF (P6-SOF-2) with unusual topology of 3D uninodal 6-connected pcu alpha-Po primitive cubic topology for P6 was successfully constructed. In P6-SOF-2, each P6 ring adopts unprecedented C2 symmetric chair-like conformation. More importantly, P6-SOF-2 owned 3D interconnected channels and large void volume, which would facilitate gas molecule transportation and adsorption. Binding sites, binding energies and interactions of C2H2, CO2 and C2H4 were investigated via SCC-DFTB calculations. These gases preferred to trap in unguiculate intrinsic cavity of P6, like a molecular trap. Governed by size-exclusive effect and van der Waals interactions, the order of the binding of the adsorbed gases by P6-SOF-2 is CO2>C2H2>C2H4, which facilitates the possible selective adsorption properties. Our study opens new perspectives in the development of SOFs. |
