摘要
Three zinc(Ⅱ) metal-organic frameworks (x F-MAC-3) have been synthesized by using Zn(Ⅱ) salts,3,5-dimethyl-1H-1,2,4-triazole (Hdmtrz) and different fluorination degree carboxylate ligands,which are analogic structures and can be described as (6,6)-connected pcu-b net.We find that the fluorine atoms have structural regulation effect on x F-MAC-3,which can not only enlarge the torsion angle φ of carboxylate ligands but also elevate the space group of structures.Besides,the CO_(2)-273 K uptake increased from 23.21 cm^(3)·g^(-1) (MAC-3) to36.13 cm^(3)·g^(-1) (4F-MAC-3) and H_(2)-77 K uptake increased from 24.33 cm^(3)·g^(-1) (MAC-3) to 59.79 cm^(3)·g^(-1)(4F-MAC-3),which means fluorination can enhance the gas adsorption uptake of x F-MAC-3 analogues.Furthermore,the results of fluorination in x F-MAC-3 analogues offer a potential way to study the ligand pre-functionalization effect on the structures and properties of MOFs analogues.
基金
supported by the NSFC (No. 21971045)
Natural Science Foundation of Shanghai (No. 18ZR1402900)
the National Key Technologies R&D Program of China (2017YFA0205103)
Shanghai Leading Academic Discipline Project (B108)。
