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An anionic metal–organic framework: metathesis of Zinc(II) with Copper(II) for efficient C3/C2 hydrocarbon and organic dyes separation

Abstract

A novel anionic metal–organic framework (NEM-7-Zn) with constricted pores, which was formed by narrow channels and blocks of functional groups, was constructed under solvothermal conditions. Due to the low stability of Zn-paddlewheel upon removal of the solvation, NEM-7-Zn possesses a very low surface area. For reinforcing the framework stability, metal-ion metathesis in a single-crystal-to-single-crystal fashion on NEM-7-Zn was performed, and then a new CuII MOF (termed NEM-7-Cu) with an identical framework was produced. Notably, the modified NEM-7-Cu possesses constrict pore and is decorated with Lewis basic pyridyl sites and uncoordinated –COO- groups, resulting in high selectivities for C3H6/C2H4 (8.61), C3H6/C2H2 (6.75), C3H8/C2H2 (7.1), and C3H8/C2H4 (8.82) under ambient conditions. Moreover, NEM-7-Cu shows highly selective adsorption of organic dye molecules (MB+ over CV+, RB+, MO-, and SD0) and the adsorbed MB+ can be released in NaCl-containing CH3OH solution. Such a post metal-ion metathesis method can be used to synthesize new and desired frameworks that could not be obtained by direct synthesis.

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Publication details

The article was received on 26 Jul 2018, accepted on 14 Sep 2018 and first published on 14 Sep 2018


Article type: Research Article
DOI: 10.1039/C8QI00773J
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    An anionic metal–organic framework: metathesis of Zinc(II) with Copper(II) for efficient C3/C2 hydrocarbon and organic dyes separation

    X. Liu, C. Hao, J. Li, Y. Wang, Y. Hou, X. Li, L. Zhao, H. Zhu and W. Guo, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QI00773J

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