A Series of Uranium-Organic Frameworks : Crucial Role of the Protonation Ability of Auxiliary Ligands

Publication date: Available online 31 October 2019Source: Inorganic Chemistry CommunicationsAuthor(s): Yong Dai, Hui-Min Chai, Rui-Xin Zhang, Jun-An Min, Zhao Wang, Meng Zhang, Yu Zhang, Jing Feng, Chi Zhang, Juan WangAbstractThree new Uranium-organic compounds have been synthesized under the strong acid condition. Both of the compound 1 [(UO2)(TMA)](H2BPY)0.5·4H2O (TMA = trimesic acid, BPY= 4,4′-bipyridine, CCDC 1841538) and 2 [(UO2)(PMA)0.5](H2BPY)0.5 (PMA= pyromellitic acid, CCDC 1870479) show a “sandwich” 2D-structure. The double-protonated 4,4′-dipyridines stabilize the supramolecular structure without obvious interlayer interactions in 1, while there is weak N-H · · · O hydrogen bonding in 2. Compound 3 [(UO2)2(PTA)(BPDO)] (PTA = terephthalic acid, CCDC 1841602) was obtained by employing 4,4′-bipyridine-N-dioxide (BPDO) as auxiliary ligand. Owing to the much weaker protonation ability, the BPDO molecules can pillar the screwy uranyl layers via U-O covalent bonds to form a 3D framework. All the title compounds are well-characterized. The results indicate the intensity of the interaction between uranyl layer and the auxiliary ligand not only affect the assembly of the architecture, but also the fluorescent and adsorption behavior.Graphical abstract

Source: Inorganic Chemistry Communications - October 31, 2019 Category: Chemistry Source Type: research