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A 2D flexible cobalt-MOF: reversible solid-state structural transformation, two-step and gate-opening adsorption
Shan-Shan Wang1, Yu-Jie Liang1, Wei Guo1
1Faculty of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650500, China. zaxchem@126.com.
Abstract:
A new 2D flexible cobalt(II) framework (Co-MOF) exhibits a reversible solid-state structural transformation upon guest molecule removal/uptake. After activation, Co-MOF-α with 1D porous channels transformed into Co-MOF-β (0D voids) accompanied by a shift in metal and carboxylate coordination modes, the rotation of organic linkers and the contraction of interstitial spaces. Gas adsorption experiments reveal that Co-MOF-β exhibits a two-step CO2 adsorption isotherm and close-to-open (type F-IV) isotherms for C2H2, C2H4 and C2H6 at 195 K. Moreover, it shows typical type I adsorption isotherms for the above gases and the selective uptake of C2H2 over CH4 and CO2 at room temperature.
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