Two novel metal-organic frameworks based on linear dicarboxylic acid and 5-(4-pyridyl)tetrazole

• Two novel MOFs have been synthesized by the strategy of mixed ligand.
• Two isomorphic complexes featured a topology of bcu-6 compared with bcu net.
• Compound 2 with NH2-function ligand showed improved CO2 adsorption.

Two isomorphic metal-organic frameworks, [Co2(4-Ptz)2(BDC)(DMA)]n (1) and [Co2(4-Ptz)2(2-NH2-BDC)(DMA)]n (2) (4-Ptz=5-(4-Pyridyl)tetrazole, H2BDC=Terephthalic Acid, 2-NH2-H2BDC=2-Aminoterephthalic Acid, DMA=N,N-dimethylacetamide), have been successfully constructed through solvothermal reactions. Crystallographic data analysis reveals a binuclear Co(II) cluster-based structure for 1 and 2, which were constructed by bridging two neighboring Co(II) ions with teterazole rings of 4-Ptz ligand together with one DMA oxygen atom. Simplifying Co2 cluster as a 6-connecting node, complexes 1 and 2 reveal bcu-6 net. The CO2 adsorption isotherms measurement at 273 K manifests higher adsorption quantities for 2 (33.8 cm3/g) than 1 (26.2 cm3/g), which was attributed to the introduction of NH2-group in 2.

Two mix-ligand based metal-organic frameworks were successfully constructed through solvothermal reaction. The two isomorphic complexes featured a topology of bcu-6 compared with 8-connected bcu net. Compound 2 with NH2-function ligand showed improved CO2 adsorption.Figure optionsDownload as PowerPoint slide