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Divergent Stabilities of Tetravalent Cerium, Uranium, and Neptunium Imidophosphorane Complexes**
Abstract
Abstract The study of the redox chemistry of mid‐actinides (U−Pu) has historically relied on cerium as a model, due to the accessibility of trivalent and tetravalent oxidation states for these ions. Recently, dramatic shifts of lanthanide 4+/3+ non‐aqueous redox couples have been established within a homoleptic imidophosphorane ligand framework. Herein we extend the chemistry of the imidophosphorane ligand (NPC=[N=P t Bu(pyrr) 2 ] − ; pyrr=pyrrolidinyl) to tetrahomoleptic NPC complexes of neptunium and cerium ( 1‐M , 2‐M , M=Np, Ce) and present comparative structural, electrochemical, and theoretical studies of these complexes. Large cathodic shifts in the M 4+/3+ (M=Ce, U, Np) couples underpin the stabilization of higher metal oxidation states owing to the strongly donating nature of the NPC ligands, providing access to the U 5+/4+ , U 6+/5+ , and to an unprecedented, well‐behaved Np 5+/4+ redox couple. The differences in the chemical redox properties of the U vs . Ce and Np complexes are rationalized based on their redox potentials, degree of structural rearrangement upon reduction/oxidation, relative molecular orbital energies, and orbital composition analyses employing density functional theory.
- Authors:
-
- School of Chemistry and Biochemistry Georgia Institute of Technology Atlanta GA 30332-0400 USA
- Department of Chemistry The University of Akron Akron OH 44325-3601 USA
- School of Chemistry and Biochemistry Georgia Institute of Technology Atlanta GA 30332-0400 USA, Nuclear and Radiological Engineering Program Georgia Institute of Technology Atlanta GA 30332-0400 USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1994887
- Grant/Contract Number:
- SC0019385
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Angewandte Chemie
- Additional Journal Information:
- Journal Name: Angewandte Chemie Journal Volume: 135 Journal Issue: 34; Journal ID: ISSN 0044-8249
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- Germany
- Language:
- English
Citation Formats
Otte, Kaitlyn S., Niklas, Julie E., Studvick, Chad M., Boggiano, Andrew C., Bacsa, John, Popov, Ivan A., and La Pierre, Henry S. Divergent Stabilities of Tetravalent Cerium, Uranium, and Neptunium Imidophosphorane Complexes**. Germany: N. p., 2023.
Web. doi:10.1002/ange.202306580.
Otte, Kaitlyn S., Niklas, Julie E., Studvick, Chad M., Boggiano, Andrew C., Bacsa, John, Popov, Ivan A., & La Pierre, Henry S. Divergent Stabilities of Tetravalent Cerium, Uranium, and Neptunium Imidophosphorane Complexes**. Germany. https://doi.org/10.1002/ange.202306580
Otte, Kaitlyn S., Niklas, Julie E., Studvick, Chad M., Boggiano, Andrew C., Bacsa, John, Popov, Ivan A., and La Pierre, Henry S. Thu .
"Divergent Stabilities of Tetravalent Cerium, Uranium, and Neptunium Imidophosphorane Complexes**". Germany. https://doi.org/10.1002/ange.202306580.
@article{osti_1994887,
title = {Divergent Stabilities of Tetravalent Cerium, Uranium, and Neptunium Imidophosphorane Complexes**},
author = {Otte, Kaitlyn S. and Niklas, Julie E. and Studvick, Chad M. and Boggiano, Andrew C. and Bacsa, John and Popov, Ivan A. and La Pierre, Henry S.},
abstractNote = {Abstract The study of the redox chemistry of mid‐actinides (U−Pu) has historically relied on cerium as a model, due to the accessibility of trivalent and tetravalent oxidation states for these ions. Recently, dramatic shifts of lanthanide 4+/3+ non‐aqueous redox couples have been established within a homoleptic imidophosphorane ligand framework. Herein we extend the chemistry of the imidophosphorane ligand (NPC=[N=P t Bu(pyrr) 2 ] − ; pyrr=pyrrolidinyl) to tetrahomoleptic NPC complexes of neptunium and cerium ( 1‐M , 2‐M , M=Np, Ce) and present comparative structural, electrochemical, and theoretical studies of these complexes. Large cathodic shifts in the M 4+/3+ (M=Ce, U, Np) couples underpin the stabilization of higher metal oxidation states owing to the strongly donating nature of the NPC ligands, providing access to the U 5+/4+ , U 6+/5+ , and to an unprecedented, well‐behaved Np 5+/4+ redox couple. The differences in the chemical redox properties of the U vs . Ce and Np complexes are rationalized based on their redox potentials, degree of structural rearrangement upon reduction/oxidation, relative molecular orbital energies, and orbital composition analyses employing density functional theory.},
doi = {10.1002/ange.202306580},
journal = {Angewandte Chemie},
number = 34,
volume = 135,
place = {Germany},
year = {Thu Jul 13 00:00:00 EDT 2023},
month = {Thu Jul 13 00:00:00 EDT 2023}
}
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