Search

Your search keyword '"Pellegrini, Kristi L."' showing total 23 results
Start Over Author "Pellegrini, Kristi L."
23 results on '"Pellegrini, Kristi L."'

11. Uranyl Peroxide Cage Cluster Solubility in Water and the Role of the Electrical Double Layer

Author

Peruski, Kathryn M., primary, Bernales, Varinia, additional, Dembowski, Mateusz, additional, Lobeck, Haylie L., additional, Pellegrini, Kristi L., additional, Sigmon, Ginger E., additional, Hickam, Sarah, additional, Wallace, Christine M., additional, Szymanowski, Jennifer E. S., additional, Balboni, Enrica, additional, Gagliardi, Laura, additional, and Burns, Peter C., additional

Published
2017
Full Text
View/download PDF

12. ChemInform Abstract: Solution 31 P NMR Study of the Acid-Catalyzed Formation of a Highly Charged {U24 Pp12 } Nanocluster, [(UO2 )24 (O2 )24 (P2 O7 )12 ]48- , and Its Structural Characterization in the Solid State Using Single-Crystal Neutron Diffraction.

Author

Dembowski, Mateusz, primary, Olds, Travis A., additional, Pellegrini, Kristi L., additional, Hoffmann, Christina, additional, Wang, Xiaoping, additional, Hickam, Sarah, additional, He, Junhong, additional, Oliver, Allen G., additional, and Burns, Peter C., additional

Published
2016
Full Text
View/download PDF

14. Solution 31P NMR Study of the Acid-Catalyzed Formation of a Highly Charged {U24Pp12} Nanocluster, [(UO2)24(O2)24(P2O7)12]48–, and Its Structural Characterization in the Solid State Using Single-Crystal Neutron Diffraction

Author

Dembowski, Mateusz, primary, Olds, Travis A., additional, Pellegrini, Kristi L., additional, Hoffmann, Christina, additional, Wang, Xiaoping, additional, Hickam, Sarah, additional, He, Junhong, additional, Oliver, Allen G., additional, and Burns, Peter C., additional

Published
2016
Full Text
View/download PDF

15. Plutonium chlorido nitrato complexes: ligand competition and computational metrics for assembly and bonding.

Author

Surbella, Robert G., Ducati, Lucas C., Autschbach, Jochen, Pellegrini, Kristi L., McNamara, Bruce K., Schwantes, Jon M., and Cahill, Christopher L.

Subjects
PLUTONIUM compounds, LIGANDS (Chemistry), CHEMICAL bonds
Abstract

Four new [Pu(iv)Cln(NO3)6−n]2− (n = 0, 2, 3) and [Pu(vi)O2Cl3(NO3)]2− containing materials were crystallized from acidic, aqueous media and structurally characterized. The anions are assembled via hydrogen and halogen bonding motifs, which are rationalized computationally. The Pu–NO3 and –Cl bonds were probed using QTAIM and NLMO analyses and found to be polar and largely ionic. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

16. Single-Crystal Time-of-Flight Neutron Diffraction and Magic-Angle-Spinning NMR Spectroscopy Resolve the Structure and 1H and 7Li Dynamics of the Uranyl Peroxide Nanocluster U60

Author

Olds, Travis A., Dembowski, Mateusz, Wang, Xiaoping, Hoffman, Christina, Alam, Todd M., Hickam, Sarah, Pellegrini, Kristi L., He, Junhong, and Burns, Peter C.

Abstract

Single-crystal time-of-flight neutron diffraction has provided atomic resolution of H atoms of H2O molecules and hydroxyl groups, as well as Li cations in the uranyl peroxide nanocluster U60. Solid-state magic-angle-spinning nuclear magnetic resonance (MAS NMR) spectroscopy was used to confirm the dynamics of these constituents, revealing the transportation of Li atoms and H2O through cluster walls. H atoms of hydroxyl units that are located on the cluster surface are involved in the transfer of H2O and Li cations from inside to outside and vice versa. This exchange occurs as a concerted motion and happens rapidly even in the solid state. As a consequence of its large size and open hexagonal pores, U60exchanges Li cations more rapidly compared to other uranyl nanoclusters.

Published
2024
Full Text
View/download PDF

17. Crystallographic and Spectroscopic Characterization of Americium Complexes Containing the Bis[(phosphino)methyl]pyridine-1-oxide (NOPOPO) Ligand Platform

Author

Corbey, Jordan F., Rapko, Brian M., Wang, Zheming, McNamara, Bruce K., Surbella, Robert G., Pellegrini, Kristi L., and Schwantes, Jon M.

Abstract

The crystal structures of americium species containing a common multifunctional phosphine oxide ligand, reported for its ability to extract f elements from acidic solutions, namely, 2,6-[Ph2P(O)CH2]2C5H3–NO, L, were finally determined after over three decades of separations studies involving these species and their surrogates. The molecular compounds Am(L)(NO3)3, Am 1:1, and [Am(L)2(NO3)][2(NO3)], Am 2:1, along with their neodymium and europium analogues, were synthesized and characterized using single-crystal X-ray crystallography, attenuated total reflectance Fourier transform infrared spectroscopy, and luminescence spectroscopy to provide a comprehensive comparison with new and known analogous complexes.

Published
2024
Full Text
View/download PDF

18. A new Pu(iii) coordination geometry in (C5H5NBr)2[PuCl3(H2O)5]·2Cl·2H2O as obtained via supramolecular assembly in aqueous, high chloride media.

Author

Surbella, Robert G., Ducati, Lucas C., Pellegrini, Kristi L., McNamara, Bruce K., Autschbach, Jochen, Schwantes, Jon M., and Cahill, Christopher L.

Subjects
CRYSTALS, CHLORIDE channels, PLUTONIUM
Abstract

Crystals of a hydrated Pu(iii) chloride, (C5H5NBr)2[PuCl3(H2O)5]·2Cl·2H2O, were grown via slow evaporation from acidic aqueous, high chloride media. X-ray diffraction data reveals the neutral [PuCl3(H2O)5] tecton is assembled via charge assisted hydrogen and halogen bonds donated by 4-bromopyridinium cations and a series of inter-tecton hydrogen bonds. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

22. Chemical and Isotopic Characterization of Noble Metal Phase from Commercial UO 2 Fuel.

Author

Pellegrini KL, Soderquist CZ, Shen SD, Krogstad EJ, Palmer CJ, Gerez KR, Buck EC, Lach TG, Schwantes JM, and Clark RA

Abstract

We report elemental and isotopic analysis for the noble metal fission product phase found in irradiated nuclear fuel. The noble metal phase was isolated from three commercial irradiated UO 2 fuels by chemically dissolving the UO 2 fuel matrix, leaving the noble metal phase as the undissolved residue. Macro amounts of this residue were dissolved using a KOH + KNO 3 fusion and then chemically separated into individual elements for analysis by mass spectrometry. Though the composition of this phase has been previously reported, this work is the most comprehensive chemical analysis of the isolated noble metal phase to date. We report both elemental and isotopic abundances of the five major components of the noble metal phase (Mo, Tc, Ru, Rh, Pd). In addition, we report a sixth element present in high quantities in this phase, tellurium. Tellurium appears to be an integral component of noble metal particles.

Published
2019
Full Text
View/download PDF

23. Single-Crystal Time-of-Flight Neutron Diffraction and Magic-Angle-Spinning NMR Spectroscopy Resolve the Structure and 1 H and 7 Li Dynamics of the Uranyl Peroxide Nanocluster U 60 .

Author

Olds TA, Dembowski M, Wang X, Hoffman C, Alam TM, Hickam S, Pellegrini KL, He J, and Burns PC

Abstract

Single-crystal time-of-flight neutron diffraction has provided atomic resolution of H atoms of H 2 O molecules and hydroxyl groups, as well as Li cations in the uranyl peroxide nanocluster U 60 . Solid-state magic-angle-spinning nuclear magnetic resonance (MAS NMR) spectroscopy was used to confirm the dynamics of these constituents, revealing the transportation of Li atoms and H 2 O through cluster walls. H atoms of hydroxyl units that are located on the cluster surface are involved in the transfer of H 2 O and Li cations from inside to outside and vice versa. This exchange occurs as a concerted motion and happens rapidly even in the solid state. As a consequence of its large size and open hexagonal pores, U 60 exchanges Li cations more rapidly compared to other uranyl nanoclusters.

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results