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Open and closed forms of the interpenetrated [Cu2(Tae)(Bpa)2](NO3)2•nH2O cationic coordination polymer: magnetic properties and high pressure CO2/CH4 gas sorption.

Abstract

Two closed and one open structural forms of the interpenetrated [Cu2(Tae)(Bpa)2](NO3)2•nH2O (H2Tae= 1,1,2,2-tetraacetylethane, Bpa= 1,2-Bis(4-pyridyl)ethane) cationic coordination polymer have been synthesized. Three crystallographically related interpenetrated “ths” cationic nets encapsulate water molecules and nitrate anions giving rise to the closed structural forms of [Cu2(Tae)(Bpa)2](NO3)2•nH2O. Depending on the location of water molecules and nitrate groups, two different closed forms, with 5.5 and 3.6 crystallization water molecules have been obtained. Thermal activation of the closed structures gives rise to a 29% expansion of the unit cell. This closed to open transformation is reversible, and is triggered by the loss or uptake of solvent. The high pressure gas adsorption experiments show similar selectivity values towards CO2 for CO2/CH4 mixtures than that showed by some metal organic frameworks without unsaturated metal sites, and isosteric heats for CO2 adsorption similar to that for the HKUST-1 compound.

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Publication details

The article was received on 30 Oct 2017, accepted on 25 Nov 2017 and first published on 28 Nov 2017


Article type: Paper
DOI: 10.1039/C7DT04081D
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Open and closed forms of the interpenetrated [Cu2(Tae)(Bpa)2](NO3)2•nH2O cationic coordination polymer: magnetic properties and high pressure CO2/CH4 gas sorption.

    R. Fernández de Luis, E. S. Larrea, J. Orive, A. Fidalgo-Marijuan, L. Lezama and M. Arriortua, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT04081D

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