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.
Fernández de Luis, Roberto
Serrano Larrea, Edurne
Orive Gómez de Segura, Joseba
Fidalgo Marijuan, Arkaitz
Lezama Diago, Luis María
Arriortua Marcaida, María Isabel
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Dalton Transactions 47(3) : 958-970 (2018) // DOI: 10.1039/C7DT04081D
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.