1
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Van Stipdonk MJ, Perez EH, Metzler LJ, Bubas AR, Corcovilos T, Somogyi A. Destruction and reconstruction of UO 22+ using gas-phase reactions. Phys Chem Chem Phys 2021; 23:11844-11851. [PMID: 33988189 DOI: 10.1039/d1cp01520f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
While the strong axial U[double bond, length as m-dash]O bonds confer high stability and inertness to UO22+, it has been shown that the axial oxo ligands can be eliminated or replaced in the gas-phase using collision-induced dissociation (CID) reactions. We report here tandem mass spectrometry experiments initiated with a gas-phase complex that includes UO22+ coordinated by a 2,6-difluorobenzoate ligand. After decarboxylation to form a difluorophenide coordinated uranyl ion, [UO2(C6F2H3)]+, CID causes elimination of CO, and then CO and C2H2 in sequential dissociation steps, to leave a reactive uranium fluoride ion, [UF2(C2H)]+. Reaction of [UF2(C2H)]+ with CH3OH creates [UF2(OCH3)]+, [UF(OCH3)2]+ and [UF(OCH3)2(CH3OH)]+. Cleavage of C-O bonds within these species results in the elimination of methyl cation (CH3+). Subsequent CID steps convert [UF(OCH3)2]+ to [UO2(F)]+ and similarly, [U(OCH3)3]+ to [UO2(OCH3)]+. Our experiments show removal of both uranyl oxo ligands in "top-down" CID reactions and replacement in "bottom-up" ion-molecule and dissociation steps.
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Affiliation(s)
- Michael J Van Stipdonk
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Ave., 308 Mellon Hall, Pittsburgh, PA 15282, USA.
| | - Evan H Perez
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Ave., 308 Mellon Hall, Pittsburgh, PA 15282, USA.
| | - Luke J Metzler
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Ave., 308 Mellon Hall, Pittsburgh, PA 15282, USA.
| | - Amanda R Bubas
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Ave., 308 Mellon Hall, Pittsburgh, PA 15282, USA.
| | | | - Arpad Somogyi
- Campus Chemical Instrument Center, The Ohio State University, Columbus, OH 43210, USA
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2
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Metzler LJ, Farmen CT, Corcovilos TA, Van Stipdonk MJ. Intrinsic chemistry of [OUCH] +: reactions with H 2O, CH 3C[triple bond, length as m-dash]N and O 2. Phys Chem Chem Phys 2021; 23:4475-4479. [PMID: 33598672 DOI: 10.1039/d1cp00177a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the first experimental study of the intrinsic chemistry of a U-methylidyne species, focusing on reaction of [OUCH]+ with H2O, O2 and CH3C[triple bond, length as m-dash]N in the gas phase. DFT was also used to determine reaction pathways, and establish the mechanism by which [OUCH]+ is formed through collision-induced dissociation of [UO2(C[triple bond, length as m-dash]CH)]+.
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Affiliation(s)
- Luke J Metzler
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Ave., Pittsburgh, PA 15282, USA.
| | - Christopher T Farmen
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Ave., Pittsburgh, PA 15282, USA.
| | - Theodore A Corcovilos
- Department of Physics, Duquesne University, 600 Forbes Ave., Pittsburgh, PA 15282, USA
| | - Michael J Van Stipdonk
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Ave., Pittsburgh, PA 15282, USA.
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3
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Carter KP, Smith KF, Tratnjek T, Deblonde GJP, Moreau LM, Rees JA, Booth CH, Abergel RJ. Controlling the Reduction of Chelated Uranyl to Stable Tetravalent Uranium Coordination Complexes in Aqueous Solution. Inorg Chem 2021; 60:973-981. [PMID: 33356197 DOI: 10.1021/acs.inorgchem.0c03088] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The solution-state interactions between octadentate hydroxypyridinone (HOPO) and catecholamide (CAM) chelating ligands and uranium were investigated and characterized by UV-visible spectrophotometry and X-ray absorption spectroscopy (XAS), as well as electrochemically via spectroelectrochemistry (SEC) and cyclic voltammetry (CV) measurements. Depending on the selected chelator, we demonstrate the controlled ability to bind and stabilize UIV, generating with 3,4,3-LI(1,2-HOPO), a tetravalent uranium complex that is practically inert toward oxidation or hydrolysis in acidic, aqueous solution. At physiological pH values, we are also able to bind and stabilize UIV to a lesser extent, as evidenced by the mix of UIV and UVI complexes observed via XAS. CV and SEC measurements confirmed that the UIV complex formed with 3,4,3-LI(1,2-HOPO) is redox inert in acidic media, and UVI ions can be reduced, likely proceeding via a two-electron reduction process.
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Affiliation(s)
- Korey P Carter
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Kurt F Smith
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Toni Tratnjek
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Gauthier J-P Deblonde
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.,Glenn T. Seaborg Institute, Physical & Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Liane M Moreau
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Julian A Rees
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Corwin H Booth
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Rebecca J Abergel
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.,Department of Nuclear Engineering, University of California, Berkeley, California 94709, United States
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4
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Bhunia P, Ghosh S, Gomila RM, Frontera A, Ghosh A. Reaction of Cu(II) Chelates with Uranyl Nitrate to Form a Coordination Complex or H-Bonded Adduct: Experimental Observations and Rationalization by Theoretical Calculations. Inorg Chem 2020; 59:15848-15861. [PMID: 33078932 DOI: 10.1021/acs.inorgchem.0c02338] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Four new heterometallic Cu(II)-U(VI) species, [{(CuL1)(CH3CN)}UO2(NO3)2] (1), [{(CuL2)(CH3CN)}UO2(NO3)2] (2), [{(CuL3)(H2O)}UO2(NO3)2] (3), and [UO2(NO3)2(H2O)2]·2[CuL4]·H2O (4), were synthesized using four different metalloligands ([CuL1], [CuL2], [CuL3], and [CuL4], respectively) derived from four unsymmetrically dicondensed N,O-donor Schiff bases. Single-crystal structural analyses revealed that complexes 1, 2, and 3 have a discrete dinuclear [Cu-UO2] core in which one metalloligand, [CuL], is connected to the uranyl moiety via a double phenoxido bridge. Two chelating nitrate ions complete the octa-coordination around uranium. Species 4 is a cocrystal, where a uranyl nitrate dihydrate is sandwiched between two metalloligands [CuL4] by the formation of strong hydrogen bonds between the H atoms of the coordinated water molecules to U(VI) and the O atoms of [CuL4]. Spectrophotometric titrations of these four metalloligands with uranyl nitrate dihydrate in acetonitrile showed a well-anchored isosbestic point between 300 and 500 nm in all cases, conforming with the coordination of [CuL1], [CuL2], [CuL3], and the H-bonding interaction of [CuL4] with UO2(NO3)2. This behavior of [CuL4] was utilized to selectively bind metal ions (e.g., Mg2+, Ca2+, Sr2+, Ba2+, and La3+) in the presence of UO2(NO3)2·2H2O in acetonitrile. The formation of these Cu(II)-U(VI) species in solution was also evaluated by steady-state fluorescence quenching experiments. The difference in the coordination behavior of these metalloligands toward [UO2(NO3)2(H2O)2] was studied by density functional theory calculations. The lower flexibility of the ethylenediamine ring and a large negative binding energy obtained from the evaluation of H bonds and supramolecular interactions between [CuL4] and [UO2(NO3)2(H2O)2] corroborate the formation of cocrystal 4. A very good linear correlation (r2 = 0.9949) was observed between the experimental U═O stretching frequencies and the strength of the equatorial bonds that connect the U atom to the metalloligand.
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Affiliation(s)
- Pradip Bhunia
- Department of Chemistry, University College of Science, University of Calcutta, 92, A.P.C. Road, Kolkata 700 009, West Bengal, India
| | - Soumavo Ghosh
- Department of Chemistry, University College of Science, University of Calcutta, 92, A.P.C. Road, Kolkata 700 009, West Bengal, India
| | - Rosa M Gomila
- Departament de Química, Universitat de les Illes Balears, Carretera de Valldemossa km 7.5, 07122 Palma de Mallorca, Baleares, Spain
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears, Carretera de Valldemossa km 7.5, 07122 Palma de Mallorca, Baleares, Spain
| | - Ashutosh Ghosh
- Department of Chemistry, University College of Science, University of Calcutta, 92, A.P.C. Road, Kolkata 700 009, West Bengal, India.,Rani Rashmoni Green University, Hooghly 712410, West Bengal, India
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5
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Miyamoto N, Ikeda Y, Tsukahara T. Multinuclear NMR Studies on Lewis Acid-Lewis Base Interactions between Bis(pentafluorophenyl)borinic Acid and Uranyl β-Diketonato Complexes in Toluene. Inorg Chem 2020; 59:11347-11356. [PMID: 32799480 DOI: 10.1021/acs.inorgchem.0c00979] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In order to examine the possibility of Lewis acid-Lewis base (LA-LB) interactions between the boron atom of B(C6F5)2OH and the oxo groups ("yl" oxygen atoms) of uranyl β-diketonato complexes, we have measured the 1H, 11B, 17O, 19F NMR and IR spectra of toluene solutions containing β-diketonato complexes [UO2(acac)2DMSO or UO2(dfh)2DMSO, where acac = 2,4-pentanedionate, dfh = 1,1,1,2,2,6,6,7,7,7-decafluoroheptane-3,5-dionate, and DMSO = dimethyl sulfoxide] and B(C6F5)2OH. 11B and 17O NMR spectra of solutions containing UO2(dfh)2DMSO and B(C6F5)2OH showed no change in their chemical shifts regardless of the [B(C6F5)2OH]/[UO2(dfh)2DMSO] ratio. This indicates that there were no apparent interactions between B(C6F5)2OH and UO2(dfh)2DMSO. On the other hand, in the corresponding NMR spectra of solutions containing UO2(acac)2DMSO and B(C6F5)2OH, new signals were observed at a higher field than signals observed in the solutions containing only B(C6F5)2OH or UO2(acac)2DMSO, and their intensity changed with the [B(C6F5)2OH]/[UO2(acac)2DMSO] ratio. These results reveal that a complex with LA-LB interaction (B···O═U) between the boron atom of B(C6F5)2OH and the "yl" oxygen atom of UO2(acac)2DMSO was formed. IR spectra also supported such complex formation; i.e., the asymmetric O═U═O stretching band of UO2(acac)2DMSO was observed to shift from 897 to 810 cm-1 with the addition of B(C6F5)2OH. Moreover, 19F NMR spectra indicated that 1:1 and 2:1 LA-LB complexes exist in equilibrium, UO{OB(C6F5)2OH}(acac)2DMSO + B(C6F5)2OH = U{OB(C6F5)2OH}2(acac)2DMSO. The thermodynamic parameters for this equilibrium were obtained as K = (2.5 ± 0.6) × 102 M-1 (at 25 °C), ΔH = -42.4 ± 5.2 kJ mol-1, and ΔS = -96.7 ± 19.4 J K-1 mol-1. In 1H NMR spectra, the signal due to -CH groups of UO2(acac)2DMSO disappeared, and three signals due to the corresponding -CH groups newly appeared with an increase in the [B(C6F5)2OH]/[UO2(acac)2DMSO] ratio. From these phenomena, it is proposed that 1:1 and 2:1 LA-LB complexes having interactions between the -CH groups of acac and the -OH group of coordinated B(C6F5)2OH are formed depending on the [B(C6F5)2OH]/[UO2(acac)2DMSO] ratio.
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Affiliation(s)
- Naomi Miyamoto
- Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1-N1-6 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Yasuhisa Ikeda
- Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1-N1-6 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Takehiko Tsukahara
- Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1-N1-6 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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6
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Kent GT, Murillo J, Wu G, Fortier S, Hayton TW. Coordination of Uranyl to the Redox-Active Calix[4]pyrrole Ligand. Inorg Chem 2020; 59:8629-8634. [PMID: 32492338 DOI: 10.1021/acs.inorgchem.0c01224] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Reaction of [Li(THF)]4[L] (L = Me8-calix[4]pyrrole]) with 0.5 equiv of [UVIO2Cl2(THF)2]2 results in formation of the oxidized calix[4]pyrrole product, [Li(THF)]2[LΔ] (1), concomitant with formation of reduced uranium oxide byproducts. Complex 1 can also be generated by reaction of [Li(THF)]4[L] with 1 equiv of I2. We hypothesize that formation of 1 proceeds via formation of a highly oxidizing cis-uranyl intermediate, [Li]2[cis-UVIO2(calix[4]pyrrole)]. To test this hypothesis, we explored the reaction of 1 with either 0.5 equiv of [UVIO2Cl2(THF)2]2 or 1 equiv of [UVIO2(OTf)2(THF)3], which affords the isostructural uranyl complexes, [Li(THF)][UVIO2(LΔ)Cl(THF)] (2) and [Li(THF)][UVIO2(LΔ)(OTf)(THF)] (3), respectively. In the solid state, 2 and 3 feature unprecedented uranyl-η5-pyrrole interactions, making them rare examples of uranyl organometallic complexes. In addition, 2 and 3 exhibit some of the smallest O-U-O angles reported to date (2: 162.0(7) and 162.7(7)°; 3: 164.5(5)°). Importantly, the O-U-O bending observed in these complexes suggests that the oxidation of [Li(THF)]4[L] does indeed occur via an unobserved cis-uranyl intermediate.
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Affiliation(s)
- Greggory T Kent
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Jesse Murillo
- Department of Chemistry and Biochemistry, University of Texas at El Paso, El Paso, Texas 79968, United States
| | - Guang Wu
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Skye Fortier
- Department of Chemistry and Biochemistry, University of Texas at El Paso, El Paso, Texas 79968, United States
| | - Trevor W Hayton
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
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7
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Rice NT, McCabe K, Bacsa J, Maron L, La Pierre HS. Two-Electron Oxidative Atom Transfer at a Homoleptic, Tetravalent Uranium Complex. J Am Chem Soc 2020; 142:7368-7373. [PMID: 32248676 DOI: 10.1021/jacs.0c02693] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A tetrahomoleptic, pseudotetrahedral U4+ imidophosphorane complex, [U(NP(pip)3)4], 1-U(PN), is reported. This complex can be oxidized by two electrons with either mesityl azide or nitrous oxide. This two-electron atom/group transfer oxidation is the first example observed at a homoleptic, tetravalent uranium complex. The mesityl imido compound [U(NMes)(NP(pip)3)4], 2-U(PN)NMes, exhibits a unique square pyramidal geometry in contrast to the expected trigonal bipyramidal geometry of the oxo complex [U(O)(NP(pip)3)4], 2-U(PN)O. The bonding driving the structural dichotomy of these structures and the absence of a structurally observable inverse trans-influence in 2-U(PN)NMes were examined by DFT and natural bonding orbital analysis.
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Affiliation(s)
- Natalie T Rice
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Karl McCabe
- Laboratoire de Physique et Chimie des Nano-objets, Institut National des Sciences Appliquees, 31077 Toulouse, Cedex 4 France
| | - John Bacsa
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Laurent Maron
- Laboratoire de Physique et Chimie des Nano-objets, Institut National des Sciences Appliquees, 31077 Toulouse, Cedex 4 France
| | - Henry S La Pierre
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States.,Nuclear and Radiological Engineering and Medical Physics Program, School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
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8
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Assefa MK, Wu G, Hayton TW. Uranyl Oxo Silylation Promoted by Silsesquioxane Coordination. J Am Chem Soc 2020; 142:8738-8747. [PMID: 32292028 DOI: 10.1021/jacs.0c00990] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Mikiyas K. Assefa
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Guang Wu
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Trevor W. Hayton
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
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9
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Niklas JE, Hunter KM, Gorden AEV. Bonding Interactions in Uranyl α-Diimine Complexes: A Spectroscopic and Electrochemical Study of the Impacts of Ligand Electronics and Extended Conjugation. Inorg Chem 2019; 58:15088-15100. [PMID: 31689099 DOI: 10.1021/acs.inorgchem.9b01695] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Uranyl complexes of aryl-substituted α-diimine ligands gbha (UO2-1a-f) and phen-BIAN (UO2-2a-f) [gbha (1) = glyoxal bis(2-hydroxyanil); phen-BIAN (2) = N,N'-bis(iminophenol)acenaphthene; R = OMe (a), t-bu (b), H (c), Me (d), F (e), and naphthyl (f)] were designed, prepared, and characterized by X-ray diffraction, FT-IR, NMR, UV-vis, and electrochemical methods. These ligand frameworks contain a salen-type O-N-N-O binding pocket but are redox-noninnocent, leading to unusual metal complex behaviors. Here, we describe three solid-state structures of uranyl complexes UO2-1b, UO2-1c, and UO2-1f and observe manifestations of ligand noninnocence for the U(VI) complexes UO2-1b and UO2-1c. The impacts of accessible π-systems and ligand substitution on the axial uranium-oxo interactions were evaluated spectroscopically via the intraligand charge-transfer (ILCT) processes that dominate the absorption spectra of these complexes and through changes to the asymmetric (ν3) O═U═O stretching frequency. This, in combination with electrochemical data, reveals the effects of the inclusion of the conjugated acenaphthene backbone and the importance of ligand electronic structure on uranyl's bonding interactions.
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Affiliation(s)
- Julie E Niklas
- Department of Chemistry and Biochemistry , Auburn University , 179 Chemistry Building , Auburn , Alabama 36849 , United States
| | - Katherine M Hunter
- Department of Chemistry and Biochemistry , Auburn University , 179 Chemistry Building , Auburn , Alabama 36849 , United States
| | - Anne E V Gorden
- Department of Chemistry and Biochemistry , Auburn University , 179 Chemistry Building , Auburn , Alabama 36849 , United States
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10
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11
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Cowie BE, Purkis JM, Austin J, Love JB, Arnold PL. Thermal and Photochemical Reduction and Functionalization Chemistry of the Uranyl Dication, [UVIO2]2+. Chem Rev 2019; 119:10595-10637. [DOI: 10.1021/acs.chemrev.9b00048] [Citation(s) in RCA: 70] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Bradley E. Cowie
- EaStCHEM School of Chemistry, The University of Edinburgh, Joseph Black Building, The King’s Buildings, Edinburgh EH9 3FJ, U.K
| | - Jamie M. Purkis
- EaStCHEM School of Chemistry, The University of Edinburgh, Joseph Black Building, The King’s Buildings, Edinburgh EH9 3FJ, U.K
| | - Jonathan Austin
- National Nuclear Laboratory, Chadwick House,
Warrington Road, Birchwood Park, Warrington WA3 6AE, U.K
| | - Jason B. Love
- EaStCHEM School of Chemistry, The University of Edinburgh, Joseph Black Building, The King’s Buildings, Edinburgh EH9 3FJ, U.K
| | - Polly L. Arnold
- EaStCHEM School of Chemistry, The University of Edinburgh, Joseph Black Building, The King’s Buildings, Edinburgh EH9 3FJ, U.K
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12
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van Stipdonk MJ, Tatosian IJ, Iacovino AC, Bubas AR, Metzler LJ, Sherman MC, Somogyi A. Gas-Phase Deconstruction of UO 22+: Mass Spectrometry Evidence for Generation of [OU VICH] + by Collision-Induced Dissociation of [U VIO 2(C≡CH)] . JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:796-805. [PMID: 30911904 DOI: 10.1007/s13361-019-02179-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 03/04/2019] [Accepted: 03/05/2019] [Indexed: 06/09/2023]
Abstract
Because of the high stability and inertness of the U=O bonds, activation and/or functionalization of UO22+ and UO2+ remain challenging tasks. We show here that collision-induced dissociation (CID) of the uranyl-propiolate cation, [UVIO2(O2C-C≡CH)]+, can be used to prepare [UVIO2(C≡CH)]+ in the gas phase by decarboxylation. Remarkably, CID of [UVIO2(C≡CH)]+ caused elimination of CO to create [OUVICH]+, thus providing a new example of a well-defined substitution of an "yl" oxo ligand of UVIO22+ in a unimolecular reaction. Relative energies for candidate structures based on density functional theory calculations suggest that the [OUVICH]+ ion is a uranium-methylidyne product, with a U≡C triple bond composed of one σ-bond with contributions from the U df and C sp hybrid orbitals, and two π-bonds with contributions from the U df and C p orbitals. Upon isolation, without imposed collisional activation, [OUVICH]+ appears to react spontaneously with O2 to produce [UVO2]+. Graphical Abstract .
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Affiliation(s)
- Michael J van Stipdonk
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Avenue, Pittsburgh, PA, 15282, USA.
| | - Irena J Tatosian
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Avenue, Pittsburgh, PA, 15282, USA
| | - Anna C Iacovino
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Avenue, Pittsburgh, PA, 15282, USA
| | - Amanda R Bubas
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Avenue, Pittsburgh, PA, 15282, USA
- Department of Chemistry, University of Utah, 315 1400 E, Salt Lake City, UT, 84112, USA
| | - Luke J Metzler
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Avenue, Pittsburgh, PA, 15282, USA
| | - Mary C Sherman
- Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Avenue, Pittsburgh, PA, 15282, USA
| | - Arpad Somogyi
- Mass Spectrometry and Proteomics Facility, Campus Chemical Instrument Center, The Ohio State University, Columbus, OH, 43210, USA
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13
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Cowie BE, Nichol GS, Love JB, Arnold PL. Double uranium oxo cations derived from uranyl by borane or silane reduction. Chem Commun (Camb) 2018; 54:3839-3842. [PMID: 29589007 PMCID: PMC5932998 DOI: 10.1039/c8cc00341f] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new type of double uranium oxo cation [O-U-O-U-O]4+ is prepared by selective oxygen-atom abstraction from macrocyclic uranyl complexes using either boranes or silanes. A significant degree of multiple U[double bond, length as m-dash]O bonding is evident throughout the U2O3 core, but either trans-,cis- or trans-,trans-OUOUO motifs can be isolated as boron- or silicon-capped oxo complexes. Further controlled deoxygenation of the borylated system is also possible.
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Affiliation(s)
- Bradley E Cowie
- EaStCHEM School of Chemistry, The University of Edinburgh, Joseph Black Building, The King's Buildings, Edinburgh, EH9 3FJ, UK.
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14
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Schöne S, Radoske T, März J, Stumpf T, Patzschke M, Ikeda-Ohno A. [UO2
Cl2
(phen)2
], a Simple Uranium(VI) Compound with a Significantly Bent Uranyl Unit (phen=1,10-phenanthroline). Chemistry 2017; 23:13574-13578. [DOI: 10.1002/chem.201703009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Sebastian Schöne
- Helmholtz-Zentrum Dresden-Rossendorf (HZDR); Institute of Resource Ecology; Bautzner Landstraße 400 01328 Dresden Germany
| | - Thomas Radoske
- Helmholtz-Zentrum Dresden-Rossendorf (HZDR); Institute of Resource Ecology; Bautzner Landstraße 400 01328 Dresden Germany
| | - Juliane März
- Helmholtz-Zentrum Dresden-Rossendorf (HZDR); Institute of Resource Ecology; Bautzner Landstraße 400 01328 Dresden Germany
| | - Thorsten Stumpf
- Helmholtz-Zentrum Dresden-Rossendorf (HZDR); Institute of Resource Ecology; Bautzner Landstraße 400 01328 Dresden Germany
| | - Michael Patzschke
- Helmholtz-Zentrum Dresden-Rossendorf (HZDR); Institute of Resource Ecology; Bautzner Landstraße 400 01328 Dresden Germany
| | - Atsushi Ikeda-Ohno
- Helmholtz-Zentrum Dresden-Rossendorf (HZDR); Institute of Resource Ecology; Bautzner Landstraße 400 01328 Dresden Germany
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15
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Niklas JE, Farnum BH, Gorden JD, Gorden AEV. Structural Characterization and Redox Activity of a Uranyl Dimer and Transition-Metal Complexes of a Tetradentate BIAN Ligand. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00454] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Julie E. Niklas
- Department of Chemistry and Biochemistry, Auburn University, 179 Chemistry Building, Auburn, Alabama 36849, United States
| | - Byron H. Farnum
- Department of Chemistry and Biochemistry, Auburn University, 179 Chemistry Building, Auburn, Alabama 36849, United States
| | - John D. Gorden
- Department of Chemistry and Biochemistry, Auburn University, 179 Chemistry Building, Auburn, Alabama 36849, United States
| | - Anne E. V. Gorden
- Department of Chemistry and Biochemistry, Auburn University, 179 Chemistry Building, Auburn, Alabama 36849, United States
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16
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Arnold PL, Cowie BE, Suvova M, Zegke M, Magnani N, Colineau E, Griveau JC, Caciuffo R, Love JB. Axially Symmetric U−O−Ln- and U−O−U-Containing Molecules from the Control of Uranyl Reduction with Simple f-Block Halides. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705197] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Polly L. Arnold
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
| | - Bradley E. Cowie
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
| | - Markéta Suvova
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
| | - Markus Zegke
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
| | - Nicola Magnani
- European Commission; Directorate for Nuclear Safety and Security, Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Eric Colineau
- European Commission; Directorate for Nuclear Safety and Security, Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Jean-Christophe Griveau
- European Commission; Directorate for Nuclear Safety and Security, Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Roberto Caciuffo
- European Commission; Directorate for Nuclear Safety and Security, Joint Research Centre; Postfach 2340 76125 Karlsruhe Germany
| | - Jason B. Love
- EaStCHEM School of Chemistry; University of Edinburgh; The King's Buildings Edinburgh EH9 3FJ UK
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17
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Arnold PL, Cowie BE, Suvova M, Zegke M, Magnani N, Colineau E, Griveau JC, Caciuffo R, Love JB. Axially Symmetric U-O-Ln- and U-O-U-Containing Molecules from the Control of Uranyl Reduction with Simple f-Block Halides. Angew Chem Int Ed Engl 2017; 56:10775-10779. [PMID: 28686336 PMCID: PMC5697649 DOI: 10.1002/anie.201705197] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 06/23/2017] [Indexed: 11/08/2022]
Abstract
The reduction of UVI uranyl halides or amides with simple LnII or UIII salts forms highly symmetric, linear, oxo-bridged trinuclear UV /LnIII /UV , LnIII /UIV /LnIII , and UIV /UIV /UIV complexes or linear LnIII /UV polymers depending on the stoichiometry and solvent. The reactions can be tuned to give the products of one- or two-electron uranyl reduction. The reactivity and magnetism of these compounds are discussed in the context of using a series of strongly oxo-coupled homo- and heterometallic poly(f-block) chains to better understand fundamental electronic structure in the f-block.
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Affiliation(s)
- Polly L Arnold
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK
| | - Bradley E Cowie
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK
| | - Markéta Suvova
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK
| | - Markus Zegke
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK
| | - Nicola Magnani
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Eric Colineau
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Jean-Christophe Griveau
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Roberto Caciuffo
- European Commission, Directorate for Nuclear Safety and Security, Joint Research Centre, Postfach 2340, 76125, Karlsruhe, Germany
| | - Jason B Love
- EaStCHEM School of Chemistry, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3FJ, UK
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18
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Mullane KC, Carroll PJ, Schelter EJ. Synthesis and Reduction of Uranium(V) Imido Complexes with Redox‐Active Substituents. Chemistry 2017; 23:5748-5757. [DOI: 10.1002/chem.201605758] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Indexed: 11/12/2022]
Affiliation(s)
- Kimberly C. Mullane
- P. Roy and Diana T. Vagelos Laboratories Department of Chemistry University of Pennsylvania 231 S. 34th St. Philadelphia PA 19104 USA
| | - Patrick J. Carroll
- P. Roy and Diana T. Vagelos Laboratories Department of Chemistry University of Pennsylvania 231 S. 34th St. Philadelphia PA 19104 USA
| | - Eric J. Schelter
- P. Roy and Diana T. Vagelos Laboratories Department of Chemistry University of Pennsylvania 231 S. 34th St. Philadelphia PA 19104 USA
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19
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Kannan S, Kumar M, Sadhu B, Jaccob M, Sundararajan M. Unusual intramolecular CH⋯O hydrogen bonding interaction between a sterically bulky amide and uranyl oxygen. Dalton Trans 2017; 46:16939-16946. [DOI: 10.1039/c7dt02760e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An unusual intramolecular CH⋯O hydrogen bonding interaction between a sterically bulky amide and uranyl oxygen is found to selectively extract uranyl.
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Affiliation(s)
| | - Mukesh Kumar
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - Biswajit Sadhu
- Radiation Safety and Systems Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | | | - Mahesh Sundararajan
- Theoretical Chemistry Section
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
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20
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Kiernicki JJ, Zeller M, Bart SC. Facile Reductive Silylation of UO 22+ to Uranium(IV) Chloride. Angew Chem Int Ed Engl 2016; 56:1097-1100. [PMID: 27990733 DOI: 10.1002/anie.201609838] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Revised: 11/19/2016] [Indexed: 11/08/2022]
Abstract
General reductive silylation of the UO22+ cation occurs readily in a one-pot, two-step stoichiometric reaction at room temperature to form uranium(IV) siloxides. Addition of two equivalents of an alkylating reagent to UO2 X2 (L)2 (X=Cl, Br, I, OTf; L=triphenylphosphine oxide, 2,2'-bipyridyl) followed by two equivalents of a silyl (pseudo)halide, R3 Si-X (R=aryl, alkyl, H; X=Cl, Br, I, OTf, SPh), cleanly affords (R3 SiO)2 UX2 (L)2 in high yields. Support is included for the key step in the process, reduction of UVI to UV . This procedure is applicable to a wide range of commercially available uranyl salts, silyl halides, and alkylating reagents. Under this protocol, one equivalent of SiCl4 or two equivalents of Me2 SiCl2 results in direct conversion of the uranyl to uranium(IV) tetrachloride. Full spectroscopic and structural characterization of the siloxide products is reported.
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Affiliation(s)
- John J Kiernicki
- H. C. Brown Laboratory, Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA
| | - Matthias Zeller
- H. C. Brown Laboratory, Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA.,Department of Chemistry, Youngstown State University, Youngstown, OH, 44555, USA
| | - Suzanne C Bart
- H. C. Brown Laboratory, Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA
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21
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Kiernicki JJ, Zeller M, Bart SC. Facile Reductive Silylation of UO2
2+
to Uranium(IV) Chloride. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201609838] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- John J. Kiernicki
- H. C. Brown Laboratory, Department of Chemistry; Purdue University; West Lafayette IN 47907 USA
| | - Matthias Zeller
- H. C. Brown Laboratory, Department of Chemistry; Purdue University; West Lafayette IN 47907 USA
- Department of Chemistry; Youngstown State University; Youngstown OH 44555 USA
| | - Suzanne C. Bart
- H. C. Brown Laboratory, Department of Chemistry; Purdue University; West Lafayette IN 47907 USA
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22
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Pankhurst JR, Bell NL, Zegke M, Platts LN, Lamfsus CA, Maron L, Natrajan LS, Sproules S, Arnold PL, Love JB. Inner-sphere vs. outer-sphere reduction of uranyl supported by a redox-active, donor-expanded dipyrrin. Chem Sci 2016; 8:108-116. [PMID: 28451154 PMCID: PMC5304617 DOI: 10.1039/c6sc02912d] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 10/11/2016] [Indexed: 11/21/2022] Open
Abstract
The uranyl(vi) complex UO2Cl(L) of the redox-active, acyclic diimino-dipyrrin anion, L- is reported and its reaction with inner- and outer-sphere reductants studied. Voltammetric, EPR-spectroscopic and X-ray crystallographic studies show that chemical reduction by the outer-sphere reagent CoCp2 initially reduces the ligand to a dipyrrin radical, and imply that a second equivalent of CoCp2 reduces the U(vi) centre to form U(v). Cyclic voltammetry indicates that further outer-sphere reduction to form the putative U(iv) trianion only occurs at strongly cathodic potentials. The initial reduction of the dipyrrin ligand is supported by emission spectra, X-ray crystallography, and DFT; the latter also shows that these outer-sphere reactions are exergonic and proceed through sequential, one-electron steps. Reduction by the inner-sphere reductant [TiCp2Cl]2 is also likely to result in ligand reduction in the first instance but, in contrast to the outer-sphere case, reduction of the uranium centre becomes much more favoured, allowing the formation of a crystallographically characterised, doubly-titanated U(iv) complex. In the case of inner-sphere reduction only, ligand-to-metal electron-transfer is thermodynamically driven by coordination of Lewis-acidic Ti(iv) to the uranyl oxo, and is energetically preferable over the disproportionation of U(v). Overall, the involvement of the redox-active dipyrrin ligand in the reduction chemistry of UO2Cl(L) is inherent to both inner- and outer-sphere reduction mechanisms, providing a new route to accessing a variety of U(vi), U(v), and U(iv) complexes.
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Affiliation(s)
- James R Pankhurst
- EaStCHEM School of Chemistry , The University of Edinburgh , Joseph Black Building, David Brewster Road , Edinburgh , EH9 3FJ , UK . ;
| | - Nicola L Bell
- EaStCHEM School of Chemistry , The University of Edinburgh , Joseph Black Building, David Brewster Road , Edinburgh , EH9 3FJ , UK . ;
| | - Markus Zegke
- EaStCHEM School of Chemistry , The University of Edinburgh , Joseph Black Building, David Brewster Road , Edinburgh , EH9 3FJ , UK . ;
| | - Lucy N Platts
- EaStCHEM School of Chemistry , The University of Edinburgh , Joseph Black Building, David Brewster Road , Edinburgh , EH9 3FJ , UK . ;
| | - Carlos Alvarez Lamfsus
- LPCNO , INSA , Université de Toulouse , 135, avenue de Rangueil , 31077 Toulouse cedex 4 , France
| | - Laurent Maron
- LPCNO , INSA , Université de Toulouse , 135, avenue de Rangueil , 31077 Toulouse cedex 4 , France
| | - Louise S Natrajan
- Centre for Radiochemisty Research , School of Chemistry , The University of Manchester , Oxford Road , Manchester , M13 9PL , UK
| | - Stephen Sproules
- WestCHEM School of Chemistry , University of Glasgow , Glasgow , G12 8QQ , UK
| | - Polly L Arnold
- EaStCHEM School of Chemistry , The University of Edinburgh , Joseph Black Building, David Brewster Road , Edinburgh , EH9 3FJ , UK . ;
| | - Jason B Love
- EaStCHEM School of Chemistry , The University of Edinburgh , Joseph Black Building, David Brewster Road , Edinburgh , EH9 3FJ , UK . ;
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23
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Lu E, Cooper OJ, Tuna F, Wooles AJ, Kaltsoyannis N, Liddle ST. Uranium-Carbene-Imido Metalla-Allenes: Ancillary-Ligand-Controlled cis
-/trans
-Isomerisation and Assessment of trans
Influence in the R2
C=UIV
=NR′ Unit (R=Ph2
PNSiMe3
; R′=CPh3
). Chemistry 2016; 22:11559-63. [DOI: 10.1002/chem.201602690] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Erli Lu
- School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Oliver J. Cooper
- School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Floriana Tuna
- School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Ashley J. Wooles
- School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Nikolas Kaltsoyannis
- School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Stephen T. Liddle
- School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
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24
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Pedrick EA, Schultz JW, Wu G, Mirica LM, Hayton TW. Perturbation of the O–U–O Angle in Uranyl by Coordination to a 12-Membered Macrocycle. Inorg Chem 2016; 55:5693-701. [DOI: 10.1021/acs.inorgchem.6b00799] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elizabeth A. Pedrick
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Jason W. Schultz
- Department of Chemistry, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Guang Wu
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Liviu M. Mirica
- Department of Chemistry, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Trevor W. Hayton
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
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25
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Pedrick EA, Seaman LA, Scott JC, Griego L, Wu G, Hayton TW. Synthesis and Reactivity of a U(IV) Dibenzyne Complex. Organometallics 2016. [DOI: 10.1021/acs.organomet.5b00929] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Elizabeth A. Pedrick
- Department
of Chemistry and
Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Lani A. Seaman
- Department
of Chemistry and
Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Joshua C. Scott
- Department
of Chemistry and
Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Leonel Griego
- Department
of Chemistry and
Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Guang Wu
- Department
of Chemistry and
Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Trevor W. Hayton
- Department
of Chemistry and
Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
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26
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Kiernicki JJ, Harwood JS, Fanwick PE, Bart SC. Reductive silylation of Cp*UO2((Mes)PDI(Me)) promoted by Lewis bases. Dalton Trans 2016; 45:3111-9. [PMID: 26778243 DOI: 10.1039/c5dt04776e] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Functionalization of the uranyl moiety (UO2(2+)) in Cp*UO2((Mes)PDI(Me)) (1-PDI) ((Mes)PDI(Me) = 2,6-((Mes)N=CMe)2C5H3N; Mes = 2,4,6-triphenylmethyl), which bears a reduced, monoanionic pyridine(diimine) ligand, is reported. Silylating reagents, R3Si-X (R = Me, X = Cl, I, OTf, SPh; R = Ph, X = Cl), effectively add across the strong O=U=O bonds in the presence of the Lewis base, OPPh3, generating products of the form (R3SiO)2UX2(OPPh3)2 (R = Me, X = I (2-OPPh3), Cl (3-OPPh3), SPh (5-OPPh3), OTf (6-OPPh3); R = Ph, X = Cl (4-OPPh3)). During this transformation, reduction to uranium(iv) occurs with loss of (Cp*)2 and (Mes)PDI(Me), each of which acts as a one-electron source. In the reaction, the Lewis base serves to activate the silyl halide, generating a more electrophilic silyl group, as determined by (29)Si NMR spectroscopy, that undergoes facile transfer to the oxo groups. Complete U-O bond scission was accomplished by treating the uranium(iv) disiloxide compounds with additional silylating reagent, forming the family (Ph3PO)2UX4. All compounds were characterized by (1)H NMR, infrared, and electronic absorption spectroscopies. X-ray crystallographic characterization was used to elucidate the structures of 2-OPPh3, 4-OPPh3, 5-OPPh3, and 6-OPPh3.
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Affiliation(s)
- J J Kiernicki
- H.C. Brown Laboratory, Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.
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