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Elucidating trends in synthesis and structural periodicity in a series of tetravalent actinide–oxo hexamers

Journal Article · · CrystEngComm
DOI:https://doi.org/10.1039/d4ce01042f· OSTI ID:2483775
Metal ion hydrolysis and condensation reactions are critical to describing the chemical behavior of the tetravalent actinides (An) due to their high charge density. This recognition has fueled synthetic efforts targeting polynuclear actinide–oxo clusters. Oligomers ranging from trimers to octatriacontamers have been reported, with the hexameric unit, which typically exhibits a [An6(OH)4O4]12+ core, representing the most pervasive cluster. Hexamers decorated by a range of ligands, including carboxylates, sulfates, and chlorides, have been described. Previous reports have demonstrated the formation of hexamers for Th, U, Np, and Pu both in solution and the solid state, yet little work has focused on the synthesis and properties of structurally analogous clusters across the early An series using the same complexing ligand. Here, a series of benzoate (Bz) decorated actinide–oxo/hydroxo hexamers of the same general formula [An6O4(OH)4(Bz)12(H2O)n], where An = Th, U, Np, Pu and n = 6 for Th and 4 for U–Pu is reported. The title compounds were characterized by X-ray diffraction, UV-vis–NIR absorbance, Raman, and infrared spectroscopy. Notably isolation of these phases and elucidation of the parameters that underpin their formation provides insight into the ways differences in metal ion charge density manifest across the early tetravalent actinides, both in their synthetic and structural chemistry.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
AC05-76RL01830; SC0019190
OSTI ID:
2483775
Alternate ID(s):
OSTI ID: 2560431
Report Number(s):
PNNL-SA--204320
Journal Information:
CrystEngComm, Journal Name: CrystEngComm Journal Issue: 4 Vol. 27; ISSN 1466-8033
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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