A5029217876- Radioactive element chemistry and processing
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Nuclear Materials and Properties
- Chemical Synthesis and Characterization
- Nuclear reactor physics and engineering
- Crystal Structures and Properties
- Radioactive contamination and transfer
- Extraction and Separation Processes
- Lanthanide and Transition Metal Complexes
- Chemical and Physical Properties in Aqueous Solutions
- Nuclear materials and radiation effects
University of Notre Dame
2022-2025
Six lanthanide-containing (Pr-Tb, excluding Pm) uranyl peroxide cage clusters (UPCs) formed following the dissolution of studtite, [(UO2)(O2)(H2O)2](H2O)2, and lanthanide nitrates in ionic liquid 1-ethyl-3-methylimidazolium diethyl phosphate (EMIm-DEP). Crystals compounds were isolated characterized using single crystal X-ray diffraction, Raman infrared spectroscopy, scanning electron microscopy with energy-dispersive spectroscopy. The six structures are composed U24,...
Four unique actinide sulfates were synthesized using solvothermal techniques with strong acids. The first plutonium(III) sulfate structure, Pu(HSO4)3, was and is isostructural analogous lanthanide-based frameworks. A similar synthesis approach yielded crystals of NpNa0.5(HSO4)15(SO4)1.5, which has a comparable framework to the Pu(III) compound, but neptunium metal tetravalent sodium incorporated into as confirmed by chemical analysis. Anhydrous sulfate, Np(SO4)2, reported isotypic U(SO4)2....
Four uranyl peroxide compounds with novel structures were formed following the dissolution of studtite, [(UO
Plutonium(IV) oxalate hexahydrate (Pu(C2 O4 )2 ⋅ 6 H2 O; PuOx) is an important intermediate in the recovery of plutonium from used nuclear fuel. Its formation by precipitation well studied, yet its crystal structure remains unknown. Instead, PuOx assumed to be isostructural with neptunium(IV) (Np(C2 NpOx) and uranium(IV) (U(C2 UOx) despite high degree unresolved disorder that exists when determining water positions structures latter two compounds. Such assumptions regarding behavior actinide...
Abstract Invited for the cover of this issue is group Amy Hixon at University Notre Dame. The image depicts newly identified structure a Pu IV oxalate sheet compared to historically assumed structure. Read full text article 10.1002/chem.202301164 .
Plutonium(IV) oxalate hexahydrate (Pu(C2O4)2∙6H2O; PuOx) is an important intermediate in the recovery of plutonium from used nuclear fuel. Its formation via precipitation well studied, yet its crystal structure remains unknown. Instead, PuOx assumed to be isostructural with neptunium(IV) (Np(C2O4)¬2∙6H2O; NpOx) and uranium(IV) (U(C2O4)¬2∙6H2O; UOx) despite high degree unresolved disorder that exists when determining water positions structures latter two compounds. Such assumptions regarding...
We report the first crystal structure of a Pu(VI)-oxalate compound. This compound, [PuO
The first actinide borosulfates, (UO2)[B(SO4)2(SO3OH)] (TSUBOS-1) and (UO2)2[B2O(SO4)3(SO3OH)2] (TSUBOB-1), were synthesized solvothermally in oleum using UO3. classical borosulfate crystal structure of TSUBOS-1 is partially consistent with an established conventional hierarchy. Uranyl pentagonal bipyramids limit the anionic network linkages isolate sulfate tetrahedra within network. Therefore, one-dimensional chain hierarchy does not fully describe structure. TSUBOB-1 that contains...