Systematic Regulation of C2H2/CO2 Separation by 3p-Block Open Metal Sites in a Robust Metal–Organic Framework Platform

• DOI: 10.1021/acs.inorgchem.0c00115
• Publication Date: 2020-03-18T19:35:53Z
• Authors: Hong-Juan Lv; Yong-Peng Li; Ying-Ying Xue; Yu-Cheng Jiang; Shu-Ni Li; Man-Cheng Hu; Quan-Guo Zhai
• Keywords: SBus; Thermal Stability; Tetrahedron

The separation of a mixture C2H2 and CO2 is great challenge due to their similar molecular sizes shapes. Al-based metal-organic frameworks (Al-MOFs) have promise for gas applications light weight, high stability, low cost. However, the cultivation suitable Al-MOF single crystals extremely difficult has limited explorations up now. Since In, Ga, Al are all 3p-block metal elements, systematic application periodic law investigate 3p-MOFs will undoubtedly help in understanding development worthy materials. Herein, we report design robust 3p framework platform (SNNU-150) regulation C2H2/CO2 by open sites. X-ray single-crystal diffraction analysis reveals that SNNU-150 3,6-connected 3D consisting [M3O(COO)6] trinuclear secondary building units (SBUs) tritopic nitrilotribenzoate (NTB) linkers. Small {[M3O(COO)6]4(NTB)6} tetrahedral cages extra-large {[M3O(COO)6]10(NTB)14} polyhedral connect with each other generate hierarchically porous architecture. These present very water, thermal, chemical especially SNNU-150-Al, which can maintain its at 85 °C water 24 h room-temperature environment more than 30 days. IAST calculations, breakthrough experiments, GCMC simulations show MOFs top-level performance follow order > Ga-MOF In-MOF.