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Ordoñez O, Yu X, Wu G, Autschbach J, Hayton TW. Quantifying Actinide-Carbon Bond Covalency in a Uranyl-Aryl Complex Utilizing Solution 13C NMR Spectroscopy. Inorg Chem 2024; 63:9427-9433. [PMID: 37788299 DOI: 10.1021/acs.inorgchem.3c02440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
Reaction of [UO2Cl2(THF)2]2 with in situ generated LiFmes (FmesH = 1,3,5-(CF3)3C6H3) in Et2O resulted in the formation of the uranyl aryl complexes [Li(THF)3][UO2(Fmes)3] ([Li(THF)3][1]) and [Li(Et2O)3(THF)][UO2(Fmes)3] ([Li(Et2O)3(THF)][1]) in good to moderate yields after crystallization from hexanes and Et2O, respectively. Both complexes were characterized by X-ray crystallography and NMR spectroscopy. DFT calculations reveal that the Cispo resonance in [1]- exhibits a deshielding of 51 ppm from spin-orbit coupling effects originating at uranium, which indicates an appreciable covalency in the U-C bonding interaction.
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Affiliation(s)
- Osvaldo Ordoñez
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Xiaojuan Yu
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States
| | - Guang Wu
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Jochen Autschbach
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, 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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2
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Jörges M, Gremillion AJ, Knyszek D, Kelley SP, Walensky JR, Gessner VH. From a mercury(II) bis(yldiide) complex to actinide yldiides. Chem Commun (Camb) 2024; 60:3190-3193. [PMID: 38415283 DOI: 10.1039/d3cc05553a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/29/2024]
Abstract
The bis(yldiide) mercury complex, (L-Hg-L) [L = C(PPh3)P(S)Ph2], is prepared from the corresponding potassium yldiide and used to access the first substituted yldiide actinide complexes [(C5Me5)2An(L)(Cl)] (An = U, Th) via salt metathesis. Compared to previously reported phosphinocarbene complexes, the complexes exhibit long actinide-carbon distances, which can be explained by the strong polarization of the π-electron density toward carbon.
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Affiliation(s)
- Mike Jörges
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA.
- Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Bochum 44801, Germany.
| | - Alexander J Gremillion
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA.
- Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Bochum 44801, Germany.
| | - Daniel Knyszek
- Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Bochum 44801, Germany.
| | - Steven P Kelley
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA.
| | - Justin R Walensky
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA.
| | - Viktoria H Gessner
- Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Bochum 44801, Germany.
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3
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Dolai R, Kumar R, Elvers BJ, Pal PK, Joseph B, Sikari R, Nayak MK, Maiti A, Singh T, Chrysochos N, Jayaraman A, Krummenacher I, Mondal J, Priyakumar UD, Braunschweig H, Yildiz CB, Schulzke C, Jana A. Carbodicarbenes and Striking Redox Transitions of their Conjugate Acids: Influence of NHC versus CAAC as Donor Substituents. Chemistry 2023; 29:e202202888. [PMID: 36129127 PMCID: PMC10100033 DOI: 10.1002/chem.202202888] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Indexed: 01/11/2023]
Abstract
Herein, a new type of carbodicarbene (CDC) comprising two different classes of carbenes is reported; NHC and CAAC as donor substituents and compare the molecular structure and coordination to Au(I)Cl to those of NHC-only and CAAC-only analogues. The conjugate acids of these three CDCs exhibit notable redox properties. Their reactions with [NO][SbF6 ] were investigated. The reduction of the conjugate acid of CAAC-only based CDC with KC8 results in the formation of hydrogen abstracted/eliminated products, which proceed through a neutral radical intermediate, detected by EPR spectroscopy. In contrast, the reduction of conjugate acids of NHC-only and NHC/CAAC based CDCs led to intermolecular reductive (reversible) carbon-carbon sigma bond formation. The resulting relatively elongated carbon-carbon sigma bonds were found to be readily oxidized. They were, thus, demonstrated to be potent reducing agents, underlining their potential utility as organic electron donors and n-dopants in organic semiconductor molecules.
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Affiliation(s)
- Ramapada Dolai
- Tata Institute of Fundamental Research Hyderabad GopanpallyHyderabad500046TelanganaIndia
| | - Rahul Kumar
- Tata Institute of Fundamental Research Hyderabad GopanpallyHyderabad500046TelanganaIndia
| | - Benedict J. Elvers
- Institut für BiochemieUniversität GreifswaldFelix-Hausdorff-Strasse 417489GreifswaldGermany
| | - Pradeep Kumar Pal
- International Institute of Information Technology GachibowliHyderabad500032India
| | - Benson Joseph
- Tata Institute of Fundamental Research Hyderabad GopanpallyHyderabad500046TelanganaIndia
| | - Rina Sikari
- Tata Institute of Fundamental Research Hyderabad GopanpallyHyderabad500046TelanganaIndia
| | - Mithilesh Kumar Nayak
- Tata Institute of Fundamental Research Hyderabad GopanpallyHyderabad500046TelanganaIndia
| | - Avijit Maiti
- Tata Institute of Fundamental Research Hyderabad GopanpallyHyderabad500046TelanganaIndia
| | - Tejender Singh
- Tata Institute of Fundamental Research Hyderabad GopanpallyHyderabad500046TelanganaIndia
| | - Nicolas Chrysochos
- Tata Institute of Fundamental Research Hyderabad GopanpallyHyderabad500046TelanganaIndia
| | - Arumugam Jayaraman
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB)Julius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Ivo Krummenacher
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB)Julius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Jagannath Mondal
- Tata Institute of Fundamental Research Hyderabad GopanpallyHyderabad500046TelanganaIndia
| | - U. Deva Priyakumar
- International Institute of Information Technology GachibowliHyderabad500032India
| | - Holger Braunschweig
- Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB)Julius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Cem B. Yildiz
- Department of Aromatic and Medicinal PlantsAksaray UniversityAksaray68100Turkey
| | - Carola Schulzke
- Institut für BiochemieUniversität GreifswaldFelix-Hausdorff-Strasse 417489GreifswaldGermany
| | - Anukul Jana
- Tata Institute of Fundamental Research Hyderabad GopanpallyHyderabad500046TelanganaIndia
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Seed JA, Vondung L, Adams RW, Wooles AJ, Lu E, Liddle ST. Mesoionic Carbene Complexes of Uranium(IV) and Thorium(IV). Organometallics 2022; 41:1353-1363. [PMID: 36157256 PMCID: PMC9490841 DOI: 10.1021/acs.organomet.2c00120] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Indexed: 11/30/2022]
Abstract
We report the synthesis and characterization of uranium(IV) and thorium(IV) mesoionic carbene complexes [An{N(SiMe3)2}2(CH2SiMe2NSiMe3){MIC}] (An = U, 4U and Th, 4Th; MIC = {CN(Me)C(Me)N(Me)CH}), which represent rare examples of actinide mesoionic carbene linkages and the first example of a thorium mesoionic carbene complex. Complexes 4U and 4Th were prepared via a C-H activation intramolecular cyclometallation reaction of actinide halides, with concomitant formal 1,4-proton migration of an N-heterocyclic olefin (NHO). Quantum chemical calculations suggest that the An-carbene bond comprises only a σ-component, in contrast to the uranium(III) analogue [U{N(SiMe3)2}3(MIC)] (1) where computational studies suggested that the 5f3 uranium(III) ion engages in a weak one-electron π-backbond to the MIC. This highlights the varying nature of actinide-MIC bonding as a function of actinide oxidation state. In solution, 4Th exists in equilibrium with the Th(IV) metallacycle [Th{N(SiMe3)2}2(CH2SiMe2NSiMe3)] (6Th) and free NHO (3). The thermodynamic parameters of this equilibrium were probed using variable-temperature NMR spectroscopy yielding an entropically favored but enthalpically endothermic process with an overall reaction free energy of ΔG 298.15K = 0.89 kcal mol-1. Energy decomposition analysis (EDA-NOCV) of the actinide-carbon bonds in 4U and 4Th reveals that the former is enthalpically stronger and more covalent than the latter, which accounts for the respective stabilities of these two complexes.
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Affiliation(s)
- John A. Seed
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Lisa Vondung
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Ralph W. Adams
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Ashley J. Wooles
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Erli Lu
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
| | - Stephen T. Liddle
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
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Tsushima S, Takao K. Hydrophobic core formation and secondary structure elements in uranyl(VI)-binding peptides. Phys Chem Chem Phys 2022; 24:4455-4461. [PMID: 35113097 DOI: 10.1039/d1cp05401e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Cyclic peptides as well as a modified EF-hand motif of calmodulin have been newly designed to achieve high affinity towards uranyl(VI). Cyclic peptides may be engineered to bind uranyl(VI) to its backbone under acidic conditions, which may enhance its selectivity. For the modified EF-hand motif of calmodulin, strong electrostatic interactions between uranyl(VI) and negatively charged side chains play an important role in achieving high affinity; however, it is also essential to have a secondary structure element and formation of hydrophobic cores in the metal-bound state of the peptide.
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Affiliation(s)
- Satoru Tsushima
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), 01328, Dresden, Germany. .,World Research Hub Initiative (WRHI), Institute of Innovative Research, Tokyo Institute of Technology, 152-8550 Tokyo, Japan
| | - Koichiro Takao
- Laboratory for Zero-Carbon Energy, Institute of Innovative Research, Tokyo Institute of Technology, 152-8550 Tokyo, Japan
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Deka H, Fridman N, Eisen MS. A Sacrificial Iminato Ligand in the Catalytic Cyanosilylation of Ketones Promoted by Organoactinide Complexes. Inorg Chem 2022; 61:3598-3606. [PMID: 35170954 DOI: 10.1021/acs.inorgchem.1c03646] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Four new complexes containing the bis(pentamethylcyclopentadienyl)thorium(IV) moiety, Cp*2Th(L1)(Me) (Th2), Cp*2Th(L2)(Me) (Th3), Cp*2Th(L1)Cl (Th5), and Cp*2Th(L2)Cl (Th6), were synthesized in quantitative yields via the protonolysis reaction of the metallocene precursor complexes Cp*2Th(Me)2 (Th1) and Cp*2Th(Me)Cl (Th4) and the respective six- and seven-membered N-heterocyclic neutral imine ligands L1H and L2H. The molecular structures of all the complexes were established by single-crystal X-ray structure analyses. The synthesized complexes along with the precursor complexes were employed as catalysts for the cyanosilylation reaction of ketones with trimethylsilyl cyanide (Me3SiCN). The removal of the iminato ligand is necessary to trigger the reaction, allowing the formation of the active catalyst.
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Affiliation(s)
- Hemanta Deka
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa City 3200003, Israel
| | - Natalia Fridman
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa City 3200003, Israel
| | - Moris S Eisen
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa City 3200003, Israel
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Brown WK, Klausmeyer KK, Lindley BM. Unlocking metal coordination of diborylamides through ring constraints. Chem Commun (Camb) 2021; 58:867-870. [PMID: 34935791 DOI: 10.1039/d1cc06458d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A cyclic lithium diborylamide compound was synthesized and crystallographically characterized, revealing strong Li-N bonding in sharp contrast to previous linear diborylamides. Two iron(II) diborylamide complexes were also synthesized, including a 2-coordinate Fe bis(diborylamide) complex. The present cyclic diborylamide represents a new addition to the growing scope of amide ligands.
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Affiliation(s)
- W Kice Brown
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, USA.
| | - Kevin K Klausmeyer
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, USA.
| | - Brian M Lindley
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, USA.
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8
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Ordoñez O, Yu X, Wu G, Autschbach J, Hayton TW. Synthesis and Characterization of Two Uranyl-Aryl "Ate" Complexes. Chemistry 2021; 27:5885-5889. [PMID: 33270947 DOI: 10.1002/chem.202005078] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Indexed: 11/10/2022]
Abstract
Reaction of [UO2 Cl2 (THF)3 ] with 3 equivalents of LiC6 Cl5 in Et2 O resulted in the formation of first uranyl aryl complex [Li(Et2 O)2 (THF)][UO2 (C6 Cl5 )3 ] ([Li][1]) in good yields. Subsequent dissolution of [Li][1] in THF resulted in conversion into [Li(THF)4 ][UO2 (C6 Cl5 )3 (THF)] ([Li][2]), also in good yields. DFT calculations reveal that the U-C bonds in [Li][1] and [Li][2] exhibit appreciable covalency. Additionally, the 13 C NMR chemical shifts for their Cipso environments are strongly affected by spin-orbit coupling-a consequence of 5f orbital participation in the U-C bonds.
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Affiliation(s)
- Osvaldo Ordoñez
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Xiaojuan Yu
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, NY, 14260, USA
| | - Guang Wu
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Jochen Autschbach
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, NY, 14260, USA
| | - Trevor W Hayton
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, 93106, USA
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9
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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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