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Two Tb-metal organic frameworks with different metal cluster nodes for C2H2/CO2 separation
Lizhen Liu1, Yaozong Chen, Zizhu Yao
1Key Laboratory of Polymer Materials and Products of Universities in Fujian, Department of Materials Science and Engineering, Fujian University of Technology, Fuzhou, Fujian 350108, China. chenby@fjut.edu.cn.
Abstract:
Through regulating the reaction solvent and temperature, two Tb-based metal-organic frameworks, ((CH3)2NH2)2[Tb9(μ3-OH)8(μ2-OH)3(PTB)6]·(DMF)14·(H2O)19 (1) and ((CH3)2NH2)3{[Tb9(μ3-O)2(μ3-OH)12(H2O)6][Tb3(μ3-O)(HCO2)3 (PTB)6]}·(DMF)12·(H2O)7 (2) (H3PTB = pyridine-2,4,6-tribenzoic acid), have been synthesized. Structural analysis showed that the cluster node of 1 is a Tb9 cluster, while 2 contains two different nodes of a Tb3 cluster and a Tb9 cluster, which leads to their different pore structures and may potentially separate C2H2/CO2. Gas adsorption demonstrates that both MOFs can separate C2H2 and CO2, but 2 has a more optimized pore environment than 1 and can exhibit better selective separation of C2H2/CO2.
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