Ionothermal synthesis of a new cobalt metal-organic framework based on tetranuclear cobalt clusters |
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Authors: | Jian-Wei Ji Wei Zhang Guo-Xin Zhang Zheng-Bo Han |
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Affiliation: | aCollege of Chemistry, Liaoning University, Shenyang 110036, PR China |
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Abstract: | A new metal-organic network (EMIM)Co2(hip)2(μ3-OH)]·H2O (1), (H2hip = 5-hydroxyisophthalic acid and EMIM = 1-ethly-3-methylimidazolium), has been synthesized by the ionothermal reaction of cobalt nitrate, H2hip and EMIM]Br ionic liquid. Single-crystal X-ray diffraction analysis reveals that 1 exhibits a two-dimensional (2D) bilayer constructed from tetranuclear Co4(μ3-OH)2] building units and hip2− linkers. There are square cavities with the dimension of 10.161 × 10.868 Å. The EMIM]+ cations are located in the cavities, which have the hydrogen bonding interactions with the bilayer. Further more, the strong hydrogen bonds between the carboxylate and hydroxyl oxygen atoms of hip2− ligands and lattice water molecules extend the 2D layer into a 3D supramolecular network. The magnetic properties of 1 have been investigated by variable-temperature magnetic susceptibility and magnetization measurements, and the results reveal that there exist antiferromagnetic interactions. |
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Keywords: | Ionothermal synthesis Ionic liquid Metal-organic framework Tetra nuclear cobalt clusters |
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