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Song, Bai-Qiao; Yang, Qing-Yuan; Wang, Shi-Qiang; Vandichel, Matthias; Kumar, Amrit; Crowley, Clare; Kumar, Naveen; Deng, Cheng-Hua; GasconPerez, Victoria; Lusi, Matteo; Wu, Hui; Zhou, Wei; Zaworotko, Michael J
Journal of the American Chemical Society, 04/2020, Letnik: 142, Številka: 15Journal Article
Closed-to-open structural transformations in flexible coordination networks are of potential utility in gas storage and separation. Herein, we report the first example of a flexible SiF6 2–-pillared square grid material, Cu(SiF6)(L)2 n (L = 1,4-bis(1-imidazolyl)benzene), SIFSIX-23-Cu. SIFSIX-23-Cu exhibits reversible switching between nonporous (β1) and several porous (α, γ1, γ2, and γ3) phases triggered by exposure to N2, CO2, or H2O. In addition, heating β1 to 433 K resulted in irreversible transformation to a closed polymorph, β2. Single-crystal X-ray diffraction studies revealed that the phase transformations are enabled by rotation and geometrical contortion of L. Density functional theory calculations indicated that L exhibits a low barrier to rotation (as low as 8 kJmol–1) and a rather flat energy surface. In situ neutron powder diffraction studies provided further insight into these sorbate-induced phase changes. SIFSIX-23-Cu combines stability in water for over a year, high CO2 uptake (ca. 216 cm3/g at 195 K), and good thermal stability.
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in: SICRIS
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