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Issue 40, 2017
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A porous copper–organic framework with intersecting channels and gas adsorption properties

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Abstract

A solvothermal reaction of CuI with a bifunctional organic ligand 3,5-pyridinedicarboxylic acid (H2pdc) afforded a novel heterovalent copper–organic framework, [(CuI2I2)CuII4(pdc)4(H2O)4]·4DMSO (1) (DMSO = dimethyl sulfoxide). Compound 1 was structurally characterized by single-crystal X-ray diffraction analyses and further characterized by infrared spectroscopy (IR), powder X-ray diffraction (PXRD), elemental analyses and thermogravimetric analyses (TGA). Structural analysis indicates that two kinds of common secondary building units (SBUs) coexist in this 3D network. The linkage of Cu+ and I generates [CuI2I2] subunits and the connection of Cu2+ with carboxyl-O atoms gives rise to binuclear paddle-wheel [CuII2(COO)4(H2O)2] moieties. In compound 1, two different SBUs are bridged with pdc2− ligands to construct a micro-sized cage with an internal spherical cavity. Through a cage-to-cage connection, the 3D porous framework is formed which features intersecting 1D channels. Gas sorption measurements were conducted on the activated 1, showing a H2 uptake of 1.46 wt% at 77 K and under 1 bar with a high initial adsorption enthalpy of 8.2 kJ mol−1. Moreover, compound 1 has excellent adsorption selectivity for CO2 over N2 and CH4.

Graphical abstract: A porous copper–organic framework with intersecting channels and gas adsorption properties

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Publication details

The article was received on 08 Sep 2017, accepted on 19 Sep 2017 and first published on 19 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT03339G
Citation: Dalton Trans., 2017,46, 13952-13956
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    A porous copper–organic framework with intersecting channels and gas adsorption properties

    Z. Xue, D. Zhang, J. Pan, S. Han, J. Li and G. Wang, Dalton Trans., 2017, 46, 13952
    DOI: 10.1039/C7DT03339G

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