The development of metal-organic frameworks (MOFs) with highly ef?cient adsorption and separation of acetylene is very important and challenging in chemical industry due to the explosive nature of acetylene. Porous MOFs can be constructed by inserting a second auxiliary ligand, which allows the use of large ligands to construct non-interpenetrated structures and increase pore utilization. Herein, SNNU-205 is successfully synthesized, which connects two sets of interpenetrated structures to form a double walled cage-within-cage structure by using the introduction of a second auxiliary ligand. The modi?ed pore environment enables SNNU-205 to ef?ciently selectively adsorb C2H2 over CO2. At 298 K and 1 atm, SNNU-205 can uptake much more C2H2 (76.3 cm3 g1 ) than CO2 (47.3 cm3 g1 ), resulting in a high substance ratio of C2H2-to-CO2 (1.6). More importantly, the ideal adsorbed solution theory selectivity calculations and column breakthrough tests further indicate SNNU-205 to be promising adsorbents for C2H2 adsorption and puri?cation.

中文翻译：

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用于高效 C2H2/CO2 分离的非互穿笼内笼金属有机框架的辅助配体定向组装

由于乙炔的爆炸性质，开发具有高效吸附和分离乙炔的金属有机框架（MOF）在化学工业中非常重要且具有挑战性。多孔MOF可以通过插入第二个辅助配体来构建，这允许使用大配体来构建非互穿结构并提高孔利用率。在此，成功合成了SNNU-205，通过引入第二个辅助配体，将两组互穿结构连接起来，形成双壁笼中笼结构。改进的孔隙环境使 SNNU-205 能够比 CO2 更有效地选择性吸附 C2H2。在 298 K 和 1 atm 下，SNNU-205 可以吸收比 CO2 (47.3 cm3 g1) 更多的 C2H2 (76.3 cm3 g1)，从而产生较高的 C2H2 与 CO2 物质比 (1.6)。