Gas sorption properties of a new Zn-BTB metal–organic framework with permanent porosity

Abstract

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. © 2023 Korean Chemical Society, Seoul & Wiley-VCH GmbH.