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Analysis of high and selective uptake of CO2 in an oxamide-containing {Cu-2(OOCR)(4)}-based metal-organic framework

Alsmail, Nada H., Suyetin, Mikhail, Yan, Yong, Cabot, Rafel, Krap, Cristina P., Lu, Jian, Easun, Timothy ORCID: https://orcid.org/0000-0002-0713-2642, Bichoutskaia, Elena, Lewis, William, Blake, Alexander J. and Schroeder, Martin 2014. Analysis of high and selective uptake of CO2 in an oxamide-containing {Cu-2(OOCR)(4)}-based metal-organic framework. Chemistry - a European Journal 20 (24) , pp. 7317-7324. 10.1002/chem.201304005

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Abstract

The porous framework [Cu2(H2O)2L]⋅4 H2O⋅2 DMA (H4L=oxalylbis(azanediyl)diisophthalic acid; DMA=N,N-dimethylacetamide), denoted NOTT-125, is formed by connection of {Cu2(RCOO)4} paddlewheels with the isophthalate linkers in L4−. A single crystal structure determination reveals that NOTT-125 crystallises in monoclinic unit cell with a=27.9161(6), b=18.6627(4) and c=32.3643(8) Å, β=112.655(3)°, space group P21/c. The structure of this material shows fof topology, which can be viewed as the packing of two types of cages (cage A and cage B) in three-dimensional space. Cage A is constructed from twelve {Cu2(OOCR)4} paddlewheels and six linkers to form an ellipsoid-shaped cavity approximately 24.0 Å along its long axis and 9.6 Å across its central diameter. Cage B consists of six {Cu2(OOCR)4} units and twelve linkers and has a spherical diameter of 12.7 Å taking into account the van der Waals radii of the atoms. NOTT-125 incorporates oxamide functionality within the pore walls, and this, combined with high porosity in desolvated NOTT-125a, is responsible for excellent CO2 uptake (40.1 wt % at 273 K and 1 bar) and selectivity for CO2 over CH4 or N2. Grand canonical Monte Carlo (GCMC) simulations show excellent agreement with the experimental gas isotherm data, and a computational study of the specific interactions and binding energies of both CO2 and CH4 with the linkers in NOTT-125 reveals a set of strong interactions between CO2 and the oxamide motif that are not possible with a single amide.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: carboxylic acid; CO2; copper; isophthalate; metal–organic frameworks
Publisher: WileyBlackwell
ISSN: 0947-6539
Date of First Compliant Deposit: 27 October 2016
Last Modified: 30 Oct 2022 20:31
URI: https://orca.cardiff.ac.uk/id/eprint/71011

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