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- Title
Tetrahydrosalen Uranyl(VI) Complexes: Crystal Structures and Solution Binding Study.
- Authors
Zhao, Xiao; Zhang, Di; Yu, Ren; Chen, Shusen; Zhao, Dahui
- Abstract
A pair of uranyl complexes incorporating tetrahydrosalen and N,N-dimethyltetrahydrosalen ligands are synthesized and studied. These new ligands, with saturated secondary and tertiary amines, exhibit higher chemostability than the prototype Schiff base (salen) structure, especially under acidic conditions. As shown by X-ray diffraction crystallography, the coordination geometry of uranium in these new complexes is a distorted pentagonal bipyramid. Interestingly, UO2([H4]-salen), comprising the tetrahydrosalen ligand, forms a dimeric structure in the crystals, with two subunits held together by sharing one of the two phenoxy oxygen atoms from each subunit, whereas UO2([H2Me2]-salen) with the N,N-dimethyltetrahydrosalen ligand is in the monomer state, with a solvent molecule coordinated to uranium to complete the penta-coordination configuration. Moreover, as revealed by UV/Vis spectroscopy using the colorimetry method, these hydrogenated salen ligands exhibit comparable, or even higher, binding affinities toward uranyl than the prototype Schiff base salen ligand in weakly basic solution.
- Subjects
METAL complexes; URANYL compounds; SOLUTION (Chemistry); CRYSTAL structure; LIGANDS (Chemistry); AMINES
- Publication
European Journal of Inorganic Chemistry, 2018, Vol 2018, Issue 10, p1185
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201701401