Gas adsorption and structural diversity in a family of Cu(II) pyridyl-isophthalate metal–organic framework materials
Tóm tắt
A family of Cu(II)-based metal–organic frameworks (MOFs) has been synthesized using three pyridyl-isophthalate ligands, H 2 L 1 (4′-(pyridin-4-yl)biphenyl-3,5-dicarboxylic acid), H 2 L 2 (4′′-(pyridin-4-yl)-1,1′:4′,1′′-terphenyl-3,5-dicarboxylic acid) and H 2 L 3 (5-[4-(pyridin-4-yl)naphthalen-1-yl]benzene-1,3-dicarboxylic acid). Although in each case the pyridyl-isophthalate ligands adopt the same pseudo-octahedral [Cu 2 (O 2 CR) 4 N 2 ] paddlewheel coordination modes, the resulting frameworks are structurally diverse, particularly in the case of the complex of Cu(II) with H 2 L 3 , which leads to three distinct supramolecular isomers, each derived from Kagomé and square nets. In contrast to [Cu(L 2 )] and the isomers of [Cu(L 3 )], [Cu(L 1 )] exhibits permanent porosity. Thus, the gas adsorption properties of [Cu(L 1 )] were investigated with N 2 , CO 2 and H 2 , and the material exhibits an isosteric heat of adsorption competitive with leading MOF sorbents for CO 2 . [Cu(L 1 )] displays high H 2 adsorption, with the density in the pores approaching that of liquid H 2 .
This article is part of the themed issue ‘Coordination polymers and metal–organic frameworks: materials by design’.
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Tài liệu tham khảo
Yang S, 2013, Irreversible network transformation in a dynamic porous host catalyzed by sulfur dioxide., J. Am. Chem. Soc., 135, 8