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Near-infrared C-term MCD spectroscopy of octahedral uranium (V) complexes

Journal Article · · Dalton Transactions
DOI:https://doi.org/10.1039/d1dt00513h· OSTI ID:1874921
C-term magnetic circular dichroism (MCD) spectroscopy is a powerful method for probing d–d and f–f transitions in paramagnetic metal complexes. However, this technique remains underdeveloped both experimentally and theoretically for studies of U(V) complexes of Oh symmetry, which have been of longstanding interest for probing electronic structure, bonding, and covalency in 5f systems. In this study, C-term NIR MCD of the Laporte forbidden f–f transitions of [UCl6]- and [UF6]- are reported, demonstrating the significant fine structure resolution possible with this technique including for the low energy Γ7 → Γ8 transitions in [UF6]-. The experimental NIR MCD studies were further extended to [U(OC6F5)6]-, [U(CH2SiMe3)6]-, and [U(NC(tBu)(Ph))6]- to evaluate the effects of ligand-type on the f–f MCD fine structure features. Theoretical calculations were conducted to determine the Laporte forbidden f–f transitions and their MCD intensity experimentally observed in the NIR spectra of the U(V) hexahalide complexes, via the inclusion of vibronic coupling, to better understand the underlying spectral fine structure features for these complexes. These spectra and simulations provide an important platform for the application of MCD spectroscopy to this widely studied class of U(V) complexes and identify areas for continued theoretical development.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC). Basic Energy Sciences (BES)
Grant/Contract Number:
89233218CNA000001; AC02-05CH11231; SC0001136; SC0016002
OSTI ID:
1874921
Alternate ID(s):
OSTI ID: 1773551
Report Number(s):
LA-UR-21-21245
Journal Information:
Dalton Transactions, Journal Name: Dalton Transactions Journal Issue: 16 Vol. 50; ISSN 1477-9226
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

References (65)

Multiple-Bond Metathesis Mediated by Sterically Pressured Uranium Complexes journal April 2006
Siloxides as Supporting Ligands in Uranium(III)-Mediated Small-Molecule Activation journal November 2012
Synthesis and Characterization of a Uranium(II) Monoarene Complex Supported by δ  Backbonding journal May 2014
Homoleptic Aryl Complexes of Uranium (IV) journal July 2019
Spectroscopic Determination of the Electronic Structure of a Uranium Single-Ion Magnet journal January 2019
Ab Initio Analysis of Metal–Ligand Bonding in An(COT) 2 with An=Th, U in Their Ground‐ and Core‐Excited States journal November 2019
Theoretical insight into the magnetic circular dichroism of uranium N 6,7 ‐edge X‐ray absorption journal October 2019
The electronic structure of organometallic complexes of the f elements.XXI. The crystal field splitting pattern of perdeuterated tris(η5-cyclopentadienyl)-uranium(IV)chloride in the low energy range journal December 1987
Structures of chloro-uranium species in molten LiCl–BeCl2 eutectic: A combined X-ray and electronic absorption spectroscopy study journal September 2005
Comparative XRPD and XAS study of the impact of the synthesis process on the electronic and structural environments of uranium–americium mixed oxides journal October 2015
Bonding in Uranium(V) Hexafluoride Based on the Experimental Electron Density Distribution Measured at 20 K journal February 2017
Tailoring the Electronic Structure of Uranium Mono(imido) Species through Ligand Variation journal February 2018
Ab Initio Study of Vibronic and Magnetic 5f-to-5f and Dipole-Allowed 5f-to-6d and Charge-Transfer Transitions in [UX 6 ] n (X = Cl, Br; n = 1, 2) journal June 2020
OpenMolcas: From Source Code to Insight journal September 2019
f-Orbital Mixing in the Octahedral f 2 Compounds UX 6 2– [X = F, Br, Cl, I] and PrCl 6 3– journal April 2020
Mapping the Electronic Structure of the Uranium(VI) Dinitride Molecule, UN 2 journal July 2020
Calculation of Dipole-Forbidden 5f Absorption Spectra of Uranium(V) Hexa-Halide Complexes journal February 2018
Ab Initio Study of Covalency in the Ground versus Core-Excited States and X-ray Absorption Spectra of Actinide Complexes journal September 2018
Experimental and Computational Studies of a Uranium Metallacyclocumulene journal February 2017
Characterization of SiaA, a Streptococcal Heme-Binding Protein Associated with a Heme ABC Transport System journal February 2008
Synthesis and Characterization of N-Heterocyclic Carbene Complexes of Uranium(III) journal February 2004
Analysis of the Absorption Spectrum of Cesium Uranium (V) Hexafluoride journal January 1965
Electron paramagnetic resonance and optical studies of pentavalent uranium journal July 1973
Covalency effects on the ligand field splittings of octahedral 5f7 compounds journal March 1974
Probing the Chemistry, Electronic Structure and Redox Energetics in Organometallic Pentavalent Uranium Complexes journal December 2008
Synthesis and Redox Chemistry of High-Valent Uranium Aryloxides journal April 2009
Bonding in tris(.eta.5-cyclopentadienyl) actinide complexes. 2. The ground electronic configurations of "base-free" Cp3An complexes (An = thorium, protactinium, uranium, neptunium, plutonium) journal April 1989
Small Molecule Activation by Uranium Tris(aryloxides): Experimental and Computational Studies of Binding of N 2 , Coupling of CO, and Deoxygenation Insertion of CO 2 under Ambient Conditions journal June 2011
High-Valent Uranium Alkyls: Evidence for the Formation of U VI (CH 2 SiMe 3 ) 6 journal August 2011
Determining Relative f and d Orbital Contributions to M–Cl Covalency in MCl 6 2– (M = Ti, Zr, Hf, U) and UOCl 5 Using Cl K-Edge X-ray Absorption Spectroscopy and Time-Dependent Density Functional Theory journal March 2012
Probing the 5f Orbital Contribution to the Bonding in a U(V) Ketimide Complex journal February 2012
Quantifying the σ and π Interactions between U(V) f Orbitals and Halide, Alkyl, Alkoxide, Amide and Ketimide Ligands journal July 2013
A Combined Mössbauer, Magnetic Circular Dichroism, and Density Functional Theory Approach for Iron Cross-Coupling Catalysis: Electronic Structure, In Situ Formation, and Reactivity of Iron-Mesityl-Bisphosphines journal June 2014
Molecular and Electronic Structure of Dinuclear Uranium Bis-μ-Oxo Complexes with Diamond Core Structural Motifs journal July 2014
Investigation of the Electronic Ground States for a Reduced Pyridine(diimine) Uranium Series: Evidence for a Ligand Tetraanion Stabilized by a Uranium Dimer journal April 2015
Organometallic Uranium(V)−Imido Halide Complexes: From Synthesis to Electronic Structure and Bonding journal April 2008
Use of 77 Se and 125 Te NMR Spectroscopy to Probe Covalency of the Actinide-Chalcogen Bonding in [Th(E n ){N(SiMe 3 ) 2 } 3 ] (E = Se, Te; n = 1, 2) and Their Oxo-Uranium(VI) Congeners journal January 2016
Examining the Effects of Ligand Variation on the Electronic Structure of Uranium Bis(imido) Species journal October 2016
Energy-Degeneracy-Driven Covalency in Actinide Bonding journal December 2018
Investigation of the Electronic Structure of Mono(1,1′-Diamidoferrocene) Uranium(IV) Complexes journal August 2013
Actinide covalency measured by pulsed electron paramagnetic resonance spectroscopy journal December 2016
Molecular and electronic structure of terminal and alkali metal-capped uranium(V) nitride complexes journal December 2016
Crystallographic and spectroscopic characterization and reactivities of a mononuclear non-haem iron(III)-superoxo complex journal December 2014
Bio-inspired nano-traps for uranium extraction from seawater and recovery from nuclear waste journal April 2018
Relativistic quantum chemical calculations show that the uranium molecule U2 has a quadruple bond journal October 2018
New evidence for 5f covalency in actinocenes determined from carbon K-edge XAS and electronic structure theory journal January 2014
Synchrotron applications to f-element research in the nuclear fuel cycle journal January 2015
Characteristics of chemical bonding of pentavalent uranium in La-doped UO 2 journal January 2017
Synthesis and electronic structure determination of uranium( vi ) ligand radical complexes journal January 2016
Magnetic circular dichroism of UCl 6 in the ligand-to-metal charge-transfer spectral region journal January 2017
Similar ligand–metal bonding for transition metals and actinides? 5f 1 U(C 7 H 7 ) 2 versus 3d n metallocenes journal January 2018
Ligand effects on electronic structure and bonding in U( iii ) coordination complexes: a combined MCD, EPR and computational study journal January 2020
On the site symmetry of uranyl crown compounds in solution journal February 2003
Pentavalent uranium trans-dihalides and -pseudohalides journal January 2012
Theory of vibronic intensity borrowing. Comparison of Herzberg‐Teller and Born‐Oppenheimer coupling journal May 1973
EPR studies of some f n and d n electronic impurities in KTaO 3 single crystals journal September 1984
Analysis of the absorption spectra of complex pentavalent actinide halides: LiUF 6 , α‐NaUF 6 , and CsUF 6 journal April 1986
Photoelectron spectroscopy and theoretical studies of gaseous uranium hexachlorides in different oxidation states: UCl6q− (q = 0–2) journal April 2015
Modern quantum chemistry with [Open]Molcas journal June 2020
High-resolution X-ray absorption spectroscopy as a probe of crystal-field and covalency effects in actinide compounds journal July 2016
High energy resolution x-ray absorption spectroscopy study of uranium in varying valence states journal December 2010
f - f origin of the insulating state in uranium dioxide: X-ray absorption experiments and first-principles calculations journal April 2011
Superhyperfine structure in the EPR spectra and optical spectra of impurity f ions in dielectric crystals: A review journal July 2013
Optically Active Vibrations of Cesium Actinide(V) Hexafluorides (CsUF 6 , CsNpF 6 , and CsPuF 6 ) journal June 1990
Assessing Covalency in Cerium and Uranium Hexachlorides: A Correlated Wavefunction and Density Functional Theory Study journal November 2015

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