Uranium dioxide in Fe(III)-containing ionic liquids with DMSO: Dissolution, separation, and structural characterization

Yao, Aining; Chu, Taiwei

doi:10.1016/j.jnucmat.2016.08.035

Cited by 6 publications

(1 citation statement)

References 69 publications

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“…In these isostructural compounds, the iron is surrounded by three bidendate N-donor ligands, forming the well-known octahedral tris bipy/phen Fe(II) complexes. The uranium is present as the uranyl(VI) entity (UO 2 2+ ), which is coordinated by four chloride ions on the equatorial plane to form a square bipyramidal [UO 2 Cl 4 ] 2– complex, which is a common form of U(VI) in concentrated chloride systems. − …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Heterometallic Iron–Uranium Complexes with a Bidentate N-Donor Ligand (2,2′-Bipyridine or 1,10-Phenanthroline)

et al. 2018

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The coordination chemistry of the diimine ligands, 2,2′-bipyridine (bipy) and 1,10-phenanthroline (phen), with d- and f-block metals has been extensively explored during the last century to yield many technological and industrial applications. Despite this long history, the chemistry of these diimine ligands in heterometallic systems containing multiple metals is poorly understood even to date. This study reports, for the first time, a systematic investigation into the coordination behavior bipy/phen in the heterometallic iron-uranium system covering all the combinations of the possible redox couples (i.e., Fe2+/Fe3+ and U4+/U6+) that are potentially relevant to the actual engineered or environmental systems. In total, 11 new compounds of pure uranium and heterometallic Fe–U complexes were successfully synthesized and structurally characterized. The synthesized compounds show an intriguing structural variety in terms of the nuclearity of the metal center (mono- and dinuclear arrangements for both Fe and U) and the manner of crystal packing based on different intra- and intermolecular interactions (e.g., π···π interactions, hydrogen bonding, etc.). The results also highlight the similarity of the fundamental coordination properties of bipy and phen toward Fe and U, regardless of the oxidation states of the metals, as well as the striking dissimilarity in their chemical behavior upon crystal packing.

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