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Issue 12, 2016
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A microporous Cu2+ MOF based on a pyridyl isophthalic acid Schiff base ligand with high CO2 uptake

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Abstract

A new Cu2+ complex that was isolated from the initial use of 5-((pyridin-4-ylmethylene)amino)isophthalic acid (PEIPH2) in 3d metal–organic framework (MOF) chemistry is reported. Complex {[Cu3(PEIP)2(5-NH2-mBDC)(DMF)]·7DMF} denoted as Cu-PEIP·7DMF was isolated from the reaction of Cu(NO3)2·2.5H2O with PEIPH2 in N,N-dimethylformamide (DMF) at 100 °C and contains both the PEIP2− ligand and its 5-NH2-mBDC2− fragment. After the structure and properties of Cu-PEIP were known an analogous complex was prepared by a rational synthetic method that involved the reaction of Cu(NO3)2·2.5H2O, 5-((pyridin-4-ylmethyl)amino)isophthalic acid (PIPH2 – the reduced analogue of PEIPH2) and 5-NH2-mBDCH2 in DMF at 100 °C. Cu-PEIP comprises two paddle-wheel [Cu2(COO)4] units and exhibits a 3D-framework with a unique trinodal underlying network and point symbol (4.52)4(42·54·64·83·92)2(52·84). This network consists of pillared kgm-a layers containing a hexagonal shaped cavity with a relatively large diameter of ∼8–9 Å surrounded by six trigonal shaped ones with a smaller diameter of ∼4–5 Å and thus resembles the structure of HKUST-1. Gas sorption studies revealed that Cu-PEIP exhibits a 1785 m2 g−1 BET area as well as high CO2 sorption capacity (4.75 mmol g−1 at 273 K) and CO2/CH4 selectivity (8.5 at zero coverage and 273 K).

Graphical abstract: A microporous Cu2+ MOF based on a pyridyl isophthalic acid Schiff base ligand with high CO2 uptake

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Publication details

The article was received on 25 Jul 2016, accepted on 20 Sep 2016 and first published on 20 Sep 2016


Article type: Research Article
DOI: 10.1039/C6QI00273K
Citation: Inorg. Chem. Front., 2016,3, 1527-1535
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    A microporous Cu2+ MOF based on a pyridyl isophthalic acid Schiff base ligand with high CO2 uptake

    A. Kourtellaris, E. E. Moushi, I. Spanopoulos, C. Tampaxis, G. Charalambopoulou, T. A. Steriotis, G. S. Papaefstathiou, P. N. Trikalitis and A. J. Tasiopoulos, Inorg. Chem. Front., 2016, 3, 1527
    DOI: 10.1039/C6QI00273K

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