Two Tb-metal organic frameworks with different metal cluster nodes for C2H2/CO2 separation

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 sy...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2021-04, Vol.50 (14), p.4932-4935
Main Authors: Liu, Lizhen, Chen, Yaozong, Yao, Zizhu, Chen, Dinggui, Lin, Quanjie, Fan, Zhiwen, Zhang, Zhangjing, Chen, Binyi, Shengchang Xiang
Format: Article
Language:English
Subjects:
Carbon dioxide
Crystal structure
Crystallography
Metal clusters
Metal-organic frameworks
Nodes
Separation
Single crystals
Structural analysis
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Summary: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.
ISSN:1477-9226
1477-9234
DOI:10.1039/d1dt00413a