Gas sorption properties of a new Zn-BTB metal–organic framework with permanent porosity
2023
Choi, I.H. | Gu, J.M. | Kim, H.C. | Kim, Y.M. | Huh, S.
A new three-dimensional (3D) Zn-based metal–organic framework (Zn-MOF) with 1,3,5-benzenetribenzoate (BTB³⁻), [Zn₄O(BTB)₂(0.5H₂O)₄]·H₂O·8DEF (1), has been prepared using the reaction between Zn(NO₃)₂·6H₂O and a tritopic bridging ligand 1,3,5-benzenetribenzoic acid (H₃BTB) in the presence of a potentially ditopic bridging ligand 3,3′-terphenyldicarboxylic acid (H₂TPDC). Interestingly, TPDC²⁻ ligand did not incorporate into the resulting Zn-MOF, and the title compound was not formed in the absence of TPDC²⁻ ligand during the synthesis. After the solvate molecules were removed, Zn-MOF 1 exhibited a doubly interpenetrated 3D ant net with a large solvent accessible void. The powder x-ray diffraction pattern of the evacuated 1 did not change significantly compared to that of the as-prepared 1, thus indicating that 1 has permanent porosity. Gas sorption analyses were performed to investigate the sorption abilities of the evacuated 1 by using several different gases at suitable temperatures: N₂, CO₂, H₂, and CH₄.
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