Highly Robust Tetranuclear Cobalt-Based 3D Framework\nfor Efficient C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> and C<sub>2</sub>H<sub>2</sub>/C<sub>2</sub>H<sub>4</sub>Separations
Junying Zhao (1823602)Qian Li (114642)Xin-cheng Zhu (9396879)Jia Li (160557)Dapeng Wu (759510)
Abstract
A novel\nnoninterpenetrated tetranuclear cobalt(II)-based metal–organic\nframework, (NH<sub>4</sub>)<sub>2</sub>·[Co<sub>4</sub>(μ<sub>3</sub>-OH)<sub>2</sub>(ina)<sub>2</sub>(pip)<sub>3</sub>]·4EtOH·H<sub>2</sub>O (simplified as <b>NbU-10</b>·S), constructed by mix linkers was synthesized by a hydrothermal\nmethod. Interestingly, the presence of a hydrophobic benzene ring\nin the organic linker makes <b>NbU-10</b>·S exhibit high\nstability in high temperature and even in aqueous solution over a\nwide pH range of about 4–13. Magnetic studies showed that the\ntetranuclear cobalt(II) units in <b>NbU-10</b>·S show dominant\nantiferromangetic properties. However, in the absence of Lewis basic\nfunctional sites and open metal sites in the material, <b>NbU-10</b> still displays high C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> and\nC<sub>2</sub>H<sub>2</sub>/C<sub>2</sub>H<sub>4</sub> selectivity\nin ideal adsorbed solution theory calculations and dynamic breakthrough\nexperiments. Moreover, density functional theory calculations were\nperformed to identify the adsorption characteristics of different\ngas molecules.
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