Isomeric Scandium–Organic Frameworks with High Hydrolytic Stability and Selective Adsorption of Acetylene

Marina O. Barsukova, Konstantin A. Kovalenko, Anton S. Nizovtsev, Aleksandr A. Sapianik, Denis G. Samsonenko, Danil N. Dybtsev, Vladimir P. Fedin

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Two solvent-controlled topological isomers of scandium–organic frameworks [Sc(Hpzc)(pzc)]·DMF·2H2O (1·DMF·2H2O) and [Sc(Hpzc)(pzc)]·DMA·4H2O (2·DMA·4H2O) were synthesized using 2,5-pyrazinedicarboxylate (pzc2–) (DMF = dimethylformamide; DMA = dimethylacetamide). Despite the isomeric nature of the obtained metal–organic frameworks (MOFs), they possess different structural features and unique adsorption properties toward gases and iodine. The compound 1 has widely spread among MOF structures a dia topology with ultranarrow channels, which together with inner surface functionalization leads to enhanced CO2 adsorption and high selectivity factors in CO2/CH4 and CO2/N2 gas mixtures (25.9 and 35.6, respectively, 1/1 v/v). Moreover, a rare preferable adsorption of CO2 over C2H2 was demonstrated. The biporous isomeric framework 2 has a crb topology inherent in zeolites. A remarkable adsorption affinity to C2H2 with the ideal adsorbed solution theory selectivity factor of 127.1 for a C2H2/C2H4 mixture (1/99 v/v) was achieved for 2. Both compounds have exceptional chemical stability in a wide range of pH from acidic to basic media.
Original languageEnglish (US)
JournalInorganic Chemistry
StatePublished - Feb 14 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-02-17
Acknowledgements: The Siberian Supercomputer Center SB RAS is gratefully acknowledged for providing computational resources.


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