Charge Control in Two Isostructural Anionic/Cationic CoII Coordination Frameworks for Enhanced Acetylene Capture |
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Authors: | Dr Di‐Ming Chen Jia‐Yue Tian Prof Chun‐Sen Liu Dr Min Chen Prof Miao Du |
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Institution: | Henan Provincial Key Laboratory of Surface & Interface Science, Zhengzhou University of Light Industry, Zhengzhou, China |
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Abstract: | Two isostructural CoII‐based metal–organic frameworks (MOFs) with the opposite framework charges have been constructed, which can be simply controlled by changing the tetrazolyl or triazolyl terminal in two bifunctional ligands. Notably, the cationic MOF 2 can adsorb much more C2H2 than the anionic MOF 1 with an increase of 88 % for C2H2 uptake at 298 K in spite of more active nitrogen sites in 1 . Theoretical calculations indicate that both nitrate and triazolyl play vital roles in C2H2 binding and the C2H2 adsorption isotherm confirms that the enhanced C2H2 uptake for 2 (225 and 163 cm3g?1 at 273 and 298 K) is exceptionally high for MOF materials without open metal sites or uncoordinated polar atom groups on the frameworks. |
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Keywords: | acetylene storage bifunctional ligand charge control metal– organic frameworks sorption mechanism |
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