Different two-dimensional metal-organic frameworks through ligand modification |
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| Authors: | Jian Zhang Bin Wang Ming Li Min-Jian Zhao Jian-Rong Li |
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| Institution: | 1. State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, PR China;2. Department of Chemistry and Chemical Engineering, and Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, PR China;3. Department of Chemistry and Chemical Engineering, and Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, PR China |
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| Abstract: | Through ligand modification, we have replaced the central benzene ring of H2TDBA (1,1′:3′,1″-terphenyl]-4,4″-dicarboxylic acid) with the pyridine structurally related ligand H2PDDA (4,4′-(pyridine-2,6-diyl)dibenzoic acid), which makes the central pyridine ring of H2PDDA more coplanar with two benzene rings on both sides of the ligand. The modification results in a dramatically different linkage configuration, thereby allowing structural changes to the metal-organic frameworks (MOFs). Two 2-D MOFs, Cu(TDBA)(DMA)2]·H2O (BUT-221, DMA = N,N-dimethylacetamide), and Cu3(PDDA)3(DMA)2(H2O)]·5H2O (BUT-223) have been synthesized through reactions of two ditopic carboxylate ligands with Cu(NO3)2·3H2O under solvothermal conditions, and characterized by single-crystal X-ray diffraction, powder X-ray diffraction, thermogravimetric analysis and infrared spectroscopy. Topological analysis shows that BUT-221 is a twofold parallel interpenetrating 44 2-D network with a skl topology, while BUT-223 is a 2-D network with a kgm topology. |
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| Keywords: | Metal-organic frameworks ligand modification crystal structure topology |
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