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

A new three-dimensional (3D) Zn-based metal-organic framework (Zn-MOF) with 1,3,5-benzenetribenzoate (BTB3-), [Zn4O(BTB)(2)(0.5H(2)O)(4)].H2O.8DEF (1), has been prepared using the reaction between Zn(NO3) .6H(2)O and a tritopic bridging ligand 1,3,5-benzenetribenzoic acid (H3BTB) in the presence of a potentially ditopic bridging ligand 3,30-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: N-2, CO2, H-2, and CH4.

Automated summary

A new three-dimensional Zn-MOF material with excellent gas sorption abilities has been synthesized.