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Metal‐Carboxyl Helical Chain Secondary Units Supported Ion‐Exchangeable Anionic Uranyl–Organic Framework
Author(s) -
Mei Lei,
Liu Kang,
Wu Si,
Kong XiangHe,
Hu KongQiu,
Yu JiPan,
Nie ChangMing,
Chai ZhiFang,
Shi WeiQun
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201902180
Subject(s) - uranyl , chemistry , actinide , metal organic framework , ligand (biochemistry) , azobenzene , ion exchange , ion , metal , metal ions in aqueous solution , crystallography , inorganic chemistry , template , materials science , molecule , nanotechnology , organic chemistry , biochemistry , receptor , adsorption
As a less explored avenue, actinide‐based metal‐organic frameworks (MOFs) are worth studying for the particularity of actinide nodes in coordination behaviour and assembly modes. In this work, an azobenzenetetracarboxylate‐based anionic MOF supported by uranyl–carboxyl helical chain units was synthesized, incorporating linear uranyl as the metal centre. This kind of helical chain‐type building unit is reported for the first time in uranyl‐based MOFs. Structural analysis reveals that the formation of helical chain secondary units can be attributed to restricted equatorial coordination of rigid flat azobenzene ligand to uranyl centres. Meanwhile, this newly‐synthesized anionic material has been used to remove Eu 3+ ions, as a non‐radioactive surrogate of Am 3+ ion, through an ion‐exchange process with [(CH 3 ) 2 NH 2 ] + ions in its open channels, as evidenced by a combination of 1 H NMR spectroscopy, EDS and PXRD.