The reaction of UO 2 (NO 3 ) 2 •6H 2 O with partly fluorinated H 3 -3F-BTB (BTB 3− : benzene-1,3,5-tribenzoate) in N,N-dimethylformamide (DMF) leads to the crystallization of the metal−organic framework (MOF) [(CH 3 ) 2 NH 2 ][UO 2 (3F-BTB)]• xDMF, named UoC-3 (UoC: University of Cologne). X-ray singlecrystal structure analysis (Pnna, Z = 4) reveals that an anionic framework is formed, in which UO 2 2+ nodes are connected by 3F-BTB 3− ligands. Because of the fluorination of the inner ring of the linker, its three benzoate groups are tilted to an "out of plane" arrangement, which leads to the formation of a three-dimensional structure with large pores. This is in contrast to a known uranyl coordination polymer with the unfluorinated BTB 3− linker, where an almost coplanar arrangement of the linker leads to graphene-like layers. The high porosity of UoC-3 was confirmed by N 2 gas sorption measurements, resulting in S BET = 4844 m 2 /g. The charge compensating [(CH 3 ) 2 NH 2 ] + cation is formed by hydrolysis of DMF. Direct addition of [(CH 3 ) 2 NH 2 ]Cl to the reaction carried out in ethanol/H 2 O (v:v, 5:1) leads to the same MOF but with lower crystallinity. When using solvents, which hydrolyze to larger cations (e.g., N,N-diethylformamide (DEF): [(C 2 H 5 ) 2 NH 2 ] + and N,N-di(n-butyl)formamide (DBF): [(C 4 H 9 ) 2 NH 2 ] + ), again the formation of UoC-3 was found, as confirmed by X-ray single-crystal analysis and X-ray powder diffraction. Thus, no templating effect was achieved with these cations. The exchange of the organic cations by K + turned out to be successful, as revealed by XPS analysis. UoC-3 was also successfully tested to remove approximately 96% radioactive 137 Cs + from aqueous solutions (93% after one regeneration cycle) while retaining its crystal structure.
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