51
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Matson EM, Kiernicki JJ, Anderson NH, Fanwick PE, Bart SC. Isolation of a uranium(iii) benzophenone ketyl radical that displays redox-active ligand behaviour. Dalton Trans 2014; 43:17885-8. [PMID: 25058749 DOI: 10.1039/c4dt01636j] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The first uranium(iii) charge separated ketyl radical complex, Tp*2U(OC·Ph2), has been isolated and acts as a potent two-electron reductant with reducing equivalents derived from both uranium and the redox-active benzophenone.
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Affiliation(s)
- Ellen M. Matson
- H.C. Brown Laboratory
- Department of Chemistry
- Purdue University
- West Lafayette, USA
| | - John J. Kiernicki
- H.C. Brown Laboratory
- Department of Chemistry
- Purdue University
- West Lafayette, USA
| | - Nickolas H. Anderson
- H.C. Brown Laboratory
- Department of Chemistry
- Purdue University
- West Lafayette, USA
| | - Phillip E. Fanwick
- H.C. Brown Laboratory
- Department of Chemistry
- Purdue University
- West Lafayette, USA
| | - Suzanne C. Bart
- H.C. Brown Laboratory
- Department of Chemistry
- Purdue University
- West Lafayette, USA
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52
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MacDonald MR, Fieser ME, Bates JE, Ziller JW, Furche F, Evans WJ. Identification of the +2 oxidation state for uranium in a crystalline molecular complex, [K(2.2.2-cryptand)][(C5H4SiMe3)3U]. J Am Chem Soc 2013; 135:13310-3. [PMID: 23984753 DOI: 10.1021/ja406791t] [Citation(s) in RCA: 174] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Flash reduction of Cp'3U (Cp' = C5H4SiMe3) in a column of potassium graphite in the presence of 2.2.2-cryptand generates crystalline [K(2.2.2-cryptand)][Cp'3U], the first isolable molecular U(2+) complex. To ensure that this was not the U(3+) hydride, [K(2.2.2-cryptand)][Cp'3UH], which could be crystallographically similar, the hydride complex was synthesized by addition of KH to Cp'3U and by reduction of H2 by the U(2+) complex and was confirmed to be a different compound. Density functional theory calculations indicate a 5f(3)6d(1) quintet ground state for the [Cp'3U](-) anion and match the observed strong transitions in its optical spectrum.
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Affiliation(s)
- Matthew R MacDonald
- Department of Chemistry, University of California , Irvine, California 92697-2025, United States
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53
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54
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Ephritikhine M. Recent Advances in Organoactinide Chemistry As Exemplified by Cyclopentadienyl Compounds. Organometallics 2013. [DOI: 10.1021/om400145p] [Citation(s) in RCA: 131] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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55
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Mora E, Maria L, Biswas B, Camp C, Santos IC, Pécaut J, Cruz A, Carretas JM, Marçalo J, Mazzanti M. Diamine Bis(phenolate) as Supporting Ligands in Organoactinide(IV) Chemistry. Synthesis, Structural Characterization, and Reactivity of Stable Dialkyl Derivatives. Organometallics 2012. [DOI: 10.1021/om3010806] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Elsa Mora
- Unidade de Ciências Químicas e Radiofarmacêuticas, IST/ITN, Instituto Superior Técnico, Universidade Técnica de Lisboa, 2686-953 Sacavém, Portugal
| | - Leonor Maria
- Unidade de Ciências Químicas e Radiofarmacêuticas, IST/ITN, Instituto Superior Técnico, Universidade Técnica de Lisboa, 2686-953 Sacavém, Portugal
| | - Biplab Biswas
- Laboratoire de Reconnaissance
Ionique et Chimie de Coordination, SCIB, UMR-E CEA/UJF-Grenoble 1,
INAC, CEA-Grenoble, 38054 Grenoble Cedex
09, France
| | - Clément Camp
- Laboratoire de Reconnaissance
Ionique et Chimie de Coordination, SCIB, UMR-E CEA/UJF-Grenoble 1,
INAC, CEA-Grenoble, 38054 Grenoble Cedex
09, France
| | - Isabel C. Santos
- Unidade de Ciências Químicas e Radiofarmacêuticas, IST/ITN, Instituto Superior Técnico, Universidade Técnica de Lisboa, 2686-953 Sacavém, Portugal
| | - Jacques Pécaut
- Laboratoire de Reconnaissance
Ionique et Chimie de Coordination, SCIB, UMR-E CEA/UJF-Grenoble 1,
INAC, CEA-Grenoble, 38054 Grenoble Cedex
09, France
| | - Adelaide Cruz
- Unidade de Ciências Químicas e Radiofarmacêuticas, IST/ITN, Instituto Superior Técnico, Universidade Técnica de Lisboa, 2686-953 Sacavém, Portugal
| | - José M. Carretas
- Unidade de Ciências Químicas e Radiofarmacêuticas, IST/ITN, Instituto Superior Técnico, Universidade Técnica de Lisboa, 2686-953 Sacavém, Portugal
| | - Joaquim Marçalo
- Unidade de Ciências Químicas e Radiofarmacêuticas, IST/ITN, Instituto Superior Técnico, Universidade Técnica de Lisboa, 2686-953 Sacavém, Portugal
| | - Marinella Mazzanti
- Laboratoire de Reconnaissance
Ionique et Chimie de Coordination, SCIB, UMR-E CEA/UJF-Grenoble 1,
INAC, CEA-Grenoble, 38054 Grenoble Cedex
09, France
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56
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Berthet JC, Onno JM, Gupta F, Rivière C, Thuéry P, Nierlich M, Madic C, Ephritikhine M. Coordination of 1,10-phenanthroline, 3,4,7,8-tetramethyl-1,10-phenanthroline and 2,4,6-tris(2-pyridyl)-1,3,5-triazine to MX3 (M=Ce, U; X=I, OSO2CF3) in pyridine and acetonitrile. Polyhedron 2012. [DOI: 10.1016/j.poly.2012.07.040] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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57
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Tondreau AM, Atienza CCH, Darmon JM, Milsmann C, Hoyt HM, Weller KJ, Nye SA, Lewis KM, Boyer J, Delis JGP, Lobkovsky E, Chirik PJ. Synthesis, Electronic Structure, and Alkene Hydrosilylation Activity of Terpyridine and Bis(imino)pyridine Iron Dialkyl Complexes. Organometallics 2012. [DOI: 10.1021/om3004527] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Aaron M. Tondreau
- Department
of Chemistry, Princeton University, Princeton,
New Jersey 08544,
United States
| | | | - Jonathan M. Darmon
- Department
of Chemistry, Princeton University, Princeton,
New Jersey 08544,
United States
| | - Carsten Milsmann
- Department
of Chemistry, Princeton University, Princeton,
New Jersey 08544,
United States
| | - Helen M. Hoyt
- Department
of Chemistry and
Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Keith J. Weller
- Momentive Performance Materials Inc., 260 Hudson River Road, Waterford, New
York 12188, United States
| | - Susan A. Nye
- Momentive Performance Materials Inc., 260 Hudson River Road, Waterford, New
York 12188, United States
| | - Kenrick M. Lewis
- Momentive Performance Materials Inc., 769 Old Saw Mill River Road, Tarrytown,
New York 10591, United States
| | - Julie Boyer
- Momentive Performance Materials Inc., 260 Hudson River Road, Waterford, New
York 12188, United States
| | - Johannes G. P. Delis
- Momentive Performance Materials bv., Plasticslaan 1, 4612PX Bergen op Zoom,
The Netherlands
| | - Emil Lobkovsky
- Department
of Chemistry and
Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
| | - Paul J. Chirik
- Department
of Chemistry, Princeton University, Princeton,
New Jersey 08544,
United States
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58
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Ren W, Zi G, Walter MD. Synthesis, Structure, and Reactivity of a Thorium Metallocene Containing a 2,2′-Bipyridyl Ligand. Organometallics 2012. [DOI: 10.1021/om201015f] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Wenshan Ren
- Department of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Guofu Zi
- Department of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Marc D. Walter
- Institut für Anorganische und Analytische
Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig,Germany
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59
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Mohammad A, Cladis DP, Forrest WP, Fanwick PE, Bart SC. Reductive heterocoupling mediated by Cp*2U(2,2′-bpy). Chem Commun (Camb) 2012; 48:1671-3. [DOI: 10.1039/c2cc16200h] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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60
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Ren W, Song H, Zi G, Walter MD. A bipyridyl thorium metallocene: synthesis, structure and reactivity. Dalton Trans 2012; 41:5965-73. [DOI: 10.1039/c2dt00051b] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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61
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Ransom P, Arnold TAQ, Thompson AL, Buffet JC, O'Hare D. Synthesis and characterisation of the ethylene bridged permethylindenyl cerium complex [(EBI*)CeI(THF)]. Dalton Trans 2012; 41:11267-9. [DOI: 10.1039/c2dt31439h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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62
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Antunes MA, Pereira LCJ, Santos IC, Mazzanti M, Marçalo J, Almeida M. [U(TpMe2)2(bipy)]+: A Cationic Uranium(III) Complex with Single-Molecule-Magnet Behavior. Inorg Chem 2011; 50:9915-7. [DOI: 10.1021/ic200705p] [Citation(s) in RCA: 111] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Maria A. Antunes
- Unidade de Ciências Químicas e Radiofarmacêuticas, Instituto Tecnológico e Nuclear/CFMCUL, P-2686-953 Sacavém, Portugal
| | - Laura C. J. Pereira
- Unidade de Ciências Químicas e Radiofarmacêuticas, Instituto Tecnológico e Nuclear/CFMCUL, P-2686-953 Sacavém, Portugal
| | - Isabel C. Santos
- Unidade de Ciências Químicas e Radiofarmacêuticas, Instituto Tecnológico e Nuclear/CFMCUL, P-2686-953 Sacavém, Portugal
| | - Marinella Mazzanti
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination, Service de Chimie Inorganique et Biologique, UMR-E 3 CEA/UJF, FRE3200 CNRS, INAC, CEA-Grenoble, F-38054 Grenoble Cedex 09, France
| | - Joaquim Marçalo
- Unidade de Ciências Químicas e Radiofarmacêuticas, Instituto Tecnológico e Nuclear/CFMCUL, P-2686-953 Sacavém, Portugal
| | - Manuel Almeida
- Unidade de Ciências Químicas e Radiofarmacêuticas, Instituto Tecnológico e Nuclear/CFMCUL, P-2686-953 Sacavém, Portugal
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63
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Takase MK, Fang M, Ziller JW, Furche F, Evans WJ. Reduction chemistry of the mixed ligand metallocene [(C5Me5)(C8H8)U]2(μ-C8H8) with bipyridines. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.07.074] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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64
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Camp C, Mougel V, Horeglad P, Pécaut J, Mazzanti M. Multielectron Redox Reactions Involving C−C Coupling and Cleavage in Uranium Schiff Base Complexes. J Am Chem Soc 2010; 132:17374-7. [DOI: 10.1021/ja1089364] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Clément Camp
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination, Service de Chimie Inorganique et Biologique, UMR E-3 CEA/UJF, FRE3200 CNRS, CEA-Grenoble, INAC, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
| | - Victor Mougel
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination, Service de Chimie Inorganique et Biologique, UMR E-3 CEA/UJF, FRE3200 CNRS, CEA-Grenoble, INAC, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
| | - Pawel Horeglad
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination, Service de Chimie Inorganique et Biologique, UMR E-3 CEA/UJF, FRE3200 CNRS, CEA-Grenoble, INAC, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
| | - Jacques Pécaut
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination, Service de Chimie Inorganique et Biologique, UMR E-3 CEA/UJF, FRE3200 CNRS, CEA-Grenoble, INAC, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
| | - Marinella Mazzanti
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination, Service de Chimie Inorganique et Biologique, UMR E-3 CEA/UJF, FRE3200 CNRS, CEA-Grenoble, INAC, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
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65
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Berthet JC, Maynadié J, Thuéry P, Ephritikhine M. Linear uranium metallocenes with polydentate aromatic nitrogen ligands. Dalton Trans 2010; 39:6801-7. [PMID: 20520885 DOI: 10.1039/c002279a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Treatment of [Cp*(2)U(NCMe)(5)]X(2) [Cp* = C(5)Me(5), X = BPh(4) (1) or I (1')] or Cp*(2)UI(2) in acetonitrile with the polydentate aromatic nitrogen bases phen, terpy and R(4)btbp led to the formation of the linear uranium metallocenes [Cp*(2)U(NCMe)(3)(phen)]X(2) [X = BPh(4) (2), I (2')], [Cp*(2)U(NCMe)(2)(terpy)][BPh(4)](2) (4), [Cp*(2)U(NCMe)(Me(4)btbp)][BPh(4)](2) (5) and [Cp*(2)U(NCMe)(CyMe(4)btbp)][X](2), [X = BPh(4) (6), I (6')], [phen = 1,10-phenanthroline, terpy = 2,2':6,2''-terpyridine, Me(4)btbp = 6,6'-bis-(3,3,6,6-tetramethyl-1,2,4-triazin-3-yl)-2,2'-bipyridine, CyMe(4)btbp = 6,6'-bis-(3,3,6,6-tetramethyl-cyclohexane-1,2,4-triazin-3-yl)-2,2'-bipyridine]. The bent metallocene [Cp*(2)U(phen)(2)][BPh(4)](2) (3) was isolated from the reaction of 1 and two molar equivalents of phen in THF. The X-ray crystal structures of 2.2MeCN, 3.2THF, and 6'.2MeCN were determined.
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Schelter EJ, Wu R, Veauthier JM, Bauer ED, Booth CH, Thomson RK, Graves CR, John KD, Scott BL, Thompson JD, Morris DE, Kiplinger JL. Comparative study of f-element electronic structure across a series of multimetallic actinide and lanthanoid-actinide complexes possessing redox-active bridging ligands. Inorg Chem 2010; 49:1995-2007. [PMID: 20088535 DOI: 10.1021/ic9024475] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A comparative examination of the electronic interactions across a series of trimetallic actinide and mixed lanthanide-actinide and lanthanum-actinide complexes is presented. Using reduced, radical terpyridyl ligands as conduits in a bridging framework to promote intramolecular metal-metal communication, studies containing structural, electrochemical, and X-ray absorption spectroscopy are reported for (C(5)Me(5))(2)An[-N horizontal lineC(Bn)(tpy-M{C(5)Me(4)R}(2))](2) (where An = Th(IV), U(IV); Bn = CH(2)C(6)H(5); M = La(III), Sm(III), Yb(III), U(III); R = H, Me, Et) to reveal effects dependent on the identities of the metal ions and R-groups. The electrochemical results show differences in redox energetics at the peripheral "M" site between complexes and significant wave splitting of the metal- and ligand-based processes indicating substantial electronic interactions between multiple redox sites across the actinide-containing bridge. Most striking is the appearance of strong electronic coupling for the trimetallic Yb(III)-U(IV)-Yb(III), Sm(III)-U(IV)-Sm(III), and La(III)-U(IV)-La(III) complexes, [8](-), [9b](-), and [10b](-), respectively, whose calculated comproportionation constant K(c) is slightly larger than that reported for the benchmark Creutz-Taube ion. X-ray absorption studies for monometallic metallocene complexes of U(III), U(IV), and U(V) reveal small but detectable energy differences in the "white-line" feature of the uranium L(III)-edges consistent with these variations in nominal oxidation state. The sum of these data provides evidence of 5f/6d-orbital participation in bonding and electronic delocalization in these multimetallic f-element complexes. An improved, high-yielding synthesis of 4'-cyano-2,2':6',2''-terpyridine is also reported.
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Affiliation(s)
- Eric J Schelter
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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68
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Montalvo E, Ziller JW, DiPasquale AG, Rheingold AL, Evans WJ. Utility of the 1,3,4,6,7,8-Hexahydro-2H-pyrimido[1,2-a]pyrimidinato Ligand, (hpp)−, in Stabilizing Uranium Metallocene Mono-Alkyl and “Tuck-in” Complexes. Organometallics 2010. [DOI: 10.1021/om100076s] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Elizabeth Montalvo
- Department of Chemistry, University of California, Irvine, California 92697-2025
| | - Joseph W. Ziller
- Department of Chemistry, University of California, Irvine, California 92697-2025
| | - Antonio G. DiPasquale
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358
| | - Arnold L. Rheingold
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358
| | - William J. Evans
- Department of Chemistry, University of California, Irvine, California 92697-2025
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69
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Kraft SJ, Fanwick PE, Bart SC. Synthesis and characterization of a uranium(III) complex containing a redox-active 2,2'-bipyridine ligand. Inorg Chem 2010; 49:1103-10. [PMID: 20050605 DOI: 10.1021/ic902008w] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hydrotris(3,5-dimethylpyrazolyl)borate uranium(III) diiodide derivatives have been prepared as an entry into low-valent uranium chemistry with these ligands. The bis(tetrahydrofuran) adduct, Tp*UI(2)(THF)(2) (1) (Tp* = hydrotris(3,5-dimethylpyrazolyl)borate), was synthesized by addition of sodium hydrotris(3,5-dimethylpyrazolyl)borate (NaTp*) to an equivalent of UI(3)(THF)(4). Addition of 2,2'-bipyridine (2,2'-bpy) to 1 displaced the THF molecules producing Tp*UI(2)(2,2'-bpy) (2). Both derivatives were characterized by (1)H NMR and IR spectroscopies, magnetic measurements, and X-ray crystallography. Reduction of both species was attempted with two equivalents of potassium graphite. The reduction of 1 did not result in a clean product, but rather decomposition and ligand redistribution. However, compound 2 was reduced to form Tp*(2)U(2,2'-bpy), 3, which is composed of a uranium(III) ion with a radical monoanionic bipyridine ligand. This was confirmed by X-ray crystallography, which revealed distortions in the bond lengths of the bipyridine consistent with reduction. Further support was obtained by (1)H NMR spectroscopy, which showed resonances shifted far upfield, consistent with radical character on the 2,2'-bipyridine ligand. Future studies will explore the reactivity of this compound as well as the consequences for redox-activity in the bipyridine ligand.
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Affiliation(s)
- Steven J Kraft
- Department of Chemistry, Brown Laboratory, Purdue University, West Lafayette, Indiana 47907, USA
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70
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Evans WJ, Mueller TJ, Ziller JW. Lanthanide versus actinide reactivity in the formation of sterically crowded [(C(5)Me(5))(3)ML(n)] nitrile and isocyanide complexes. Chemistry 2010; 16:964-75. [PMID: 19946904 DOI: 10.1002/chem.200901990] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The limits of steric crowding in organometallic metallocene complexes have been examined by studying the synthesis of [(C(5)Me(5))(3)ML(n)] complexes as a function of metal in which L=Me(3)CCN, Me(3)CNC, and Me(3)SiCN. The bis(tert-butyl nitrile) complexes [(C(5)Me(5))(3)Ln(NCCMe(3))(2)] (Ln=La, 1; Ce, 2; Pr, 3) can be isolated with the largest lanthanide metal ions, La(3+), Ce(3+), and Pr(3+). The Pr(3+) ion also forms an isolable mono-nitrile complex, [(C(5)Me(5))(3)Pr(NCCMe(3))] (4), whereas for Nd(3+) only the mono-adduct [(C(5)Me(5))(3)Nd(NCCMe(3))] (5) was observed. With smaller metal ions, Sm(3+) and Y(3+), insertion of Me(3)CCN into the M--C(C(5)Me(5)) bond was observed to form the cyclopentadiene-substituted ketimide complexes [(C(5)Me(5))(2)Ln{NC(C(5)Me(5))(CMe(3))}(NCCMe(3))] (Ln=Sm, 6; Y, 7). With tert-butyl isocyanide ligands, a bis-isocyanide product can be isolated with lanthanum, [(C(5)Me(5))(3)La(CNCMe(3))(2)] (8), and a mono-isocyanide product with neodymium, [(C(5)Me(5))(3)Nd(CNCMe(3))] (9). Silicon-carbon bond cleavage was observed in reactions between [(C(5)Me(5))(3)Ln] complexes and trimethylsilyl cyanide, Me(3)SiCN, to produce the trimeric cyanide complexes [{(C(5)Me(5))(2)Ln(mu-CN)(NCSiMe(3))}(3)] (Ln=La, 10; Pr, 11). With uranium, a mono-nitrile reaction product, [(C(5)Me(5))(3)U(NCCMe(3))] (12), which is analogous to 5, was obtained from the reaction between [(C(5)Me(5))(3)U] and Me(3)CCN, but [(C(5)Me(5))(3)U] reacts with Me(3)CNC through C--N bond cleavage to form a trimeric cyanide complex, [{(C(5)Me(5))(2)U(mu-CN)(CNCMe(3))}(3)] (13).
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Affiliation(s)
- William J Evans
- Department of Chemistry, University of California, Irvine, California 92697-2025, USA.
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71
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Bart SC, Heinemann FW, Anthon C, Hauser C, Meyer K. A new tripodal ligand system with steric and electronic modularity for uranium coordination chemistry. Inorg Chem 2010; 48:9419-26. [PMID: 19739633 DOI: 10.1021/ic9012697] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis of a potentially redox active tripodal ligand containing a tris(aryloxide) functionalized mesitylene anchor, (((tBu)ArOH)(3)mes) (1), and its metalation with low-valent uranium to form [(((tBu)ArO)(3)mes)U] (1-U) is reported. The results from characterization by X-ray crystallography, spectroscopic studies, and computational analysis, as well as initial reactivity studies, support a +3 uranium oxidation state. Comparison to the previously synthesized complex, [(((tBu)ArO)(3)tacn)U] (2-U), featuring the redox-innocent triazacyclononane anchor reveals that changing the anchor from the flexible triazacyclononane to a rigid mesityl fragment increases the structural flexibility of the aryloxide substituents in complexes of 1. The synthesis and crystal structures of uranium(IV) amide complexes of 1-U and 2-U are discussed.
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Affiliation(s)
- Suzanne C Bart
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University of Erlangen-Nuremberg, Egerlandstrasse 1, 91058 Erlangen, Germany
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Rinehart JD, Harris TD, Kozimor SA, Bartlett BM, Long JR. Magnetic exchange coupling in actinide-containing molecules. Inorg Chem 2009; 48:3382-95. [PMID: 19361240 DOI: 10.1021/ic801303w] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Recent progress in the assembly of actinide-containing coordination clusters has generated systems in which the first glimpses of magnetic exchange coupling can be recognized. Such systems are of interest owing to the prospects for involving 5f electrons in stronger magnetic exchange than has been observed for electrons in the more contracted 4f orbitals of the lanthanide elements. Here, we survey the actinide-containing molecules thought to exhibit magnetic exchange interactions, including multiuranium, uranium-lanthanide, uranium-transition metal, and uranium-radical species. Interpretation of the magnetic susceptibility data for compounds of this type is complicated by the combination of spin-orbit coupling and ligand-field effects arising for actinide ions. Nevertheless, for systems where analogues featuring diamagnetic replacement components for the non-actinide spin centers can be synthesized, a data subtraction approach can be utilized to probe the presence of exchange coupling. In addition, methods have been developed for employing the resulting data to estimate lower and upper bounds for the exchange constant. Emphasis is placed on evaluation of the linear clusters (cyclam)M[(mu-Cl)U(Me(2)Pz)(4)](2) (M = Co, Ni, Cu, Zn; cyclam = 1,4,8,11-tetraazacyclotetradecane; Me(2)Pz(-) = 3,5-dimethylpyrazolate), for which strong ferromagnetic exchange with 15 cm(-1) < or = J < or = 48 cm(-1) is observed for the Co(II)-containing species. Owing to the modular synthetic approach employed, this system in particular offers numerous opportunities for adjusting the strength of the magnetic exchange coupling and the total number of unpaired electrons. To this end, the prospects of such modularity are discussed through the lens of several new related clusters. Ultimately, it is hoped that this research will be of utility in the development of electronic structure models that successfully describe the magnetic behavior of actinide compounds and will perhaps even lead to new actinide-based single-molecule magnets.
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Affiliation(s)
- Jeffrey D Rinehart
- Department of Chemistry, University of California, Berkeley, California 94720-1460, USA
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73
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Arliguie T, Belkhiri L, Bouaoud SE, Thuéry P, Villiers C, Boucekkine A, Ephritikhine M. Lanthanide(III) and actinide(III) complexes [M(BH4)2 (THF)5][BPh4] and [M(BH4)2(18-crown-6)][BPh4] (M = Nd, Ce, U): synthesis, crystal structure, and density functional theory investigation of the covalent contribution to metal-borohydride bonding. Inorg Chem 2009; 48:221-30. [PMID: 19053334 DOI: 10.1021/ic801685v] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Treatment of [M(BH4)3(THF)3] with NEt3HBPh4 in THF afforded the cationic complexes [M(BH4)2(THF)5][BPh4] [M = U (1), Nd (2), Ce (3)] which were transformed into [M(BH4)2(18-crown-6)][BPh4] [M = U (4), Nd (5), Ce (6)] in the presence of 18-crown-6; [U(BH4)2(18-thiacrown-6)][BPh4] (7) was obtained from 1 and 18-thiacrown-6 in tetrahydro-thiophene. Compounds 1, 3.C4H8S, 4.THF, 5, and 6.THF exhibit a penta- or hexagonal bipyramidal crystal structure with the two terdentate borohydride ligands in apical positions; the BH4 groups in the crystals of 7.C4H8S are in relative cis positions, and the thiacrown-ether presents a saddle shape, with two diametrically opposite sulfur atoms bound to uranium in trans positions. The crystal structures of these complexes, as well as those of previously reported [M(BH4)2(THF)5]+ cations, do not reveal any clear-cut lanthanide(III)/actinide(III) differentiation. The structural data obtained for [M(BH4)2(18-crown-6)]+ (M = U, Ce) by relativistic density functional theory (DFT) calculations are indicative of a small shortening of the U...B with respect to the Ce...B distance, which is accompanied by a lengthening of the U-Hb bonds and an opening of the Hb-B-Hb angle (Hb = bridging hydrogen atom of the eta3-BH4 ligand). The Mulliken population analysis and the natural bond orbital analysis indicate that the BH4 -->M(III) donation is greater for M = U than for M = Ce, as well as the overlap population of the M-Hb bond, thus showing a better interaction between the uranium 5f orbitals and the Hb atoms. The more covalent character of the B-H-U three-center two-electron bond was confirmed by the molecular orbital (MO) analysis. Three MOs represent the pi bonding interactions between U(III) and the three Hb atoms with significant 6d and 5f orbital contributions. These MOs in the cerium(III) complex exhibit a much lesser metallic weight with practically no participation of the 4f orbitals.
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Affiliation(s)
- Thérèse Arliguie
- CEA, IRAMIS, Service de Chimie Moléculaire, CNRS URA 331, CEA/Saclay, 91191 Gif-sur-Yvette, France
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74
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Berthet JC, Thuéry P, Baudin C, Boizot B, Ephritikhine M. First reductive dimerization of a polycyclic azine. Dalton Trans 2009:7613-6. [DOI: 10.1039/b909547k] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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75
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Elkechai A, Boucekkine A, Belkhiri L, Amarouche MH, Clappe C, Hauchard D, Ephritikhine M. A DFT and experimental investigation of the electron affinity of the triscyclopentadienyl uranium complexes Cp3UX. Dalton Trans 2009:2843-9. [DOI: 10.1039/b820873e] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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76
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Berthet JC, Thuéry P, Ephritikhine M. Polyimido Clusters of Neodymium and Uranium, Including a Cluster with an M6(μ3-N)8Core. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800947] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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77
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Kolarik Z. Complexation and Separation of Lanthanides(III) and Actinides(III) by Heterocyclic N-Donors in Solutions. Chem Rev 2008; 108:4208-52. [DOI: 10.1021/cr078003i] [Citation(s) in RCA: 372] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zdenek Kolarik
- Consultant, Kolberger Strasse 9, D-76139 Karlsruhe, Germany
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78
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Graves CR, Schelter EJ, Cantat T, Scott BL, Kiplinger JL. A Mild Protocol To Generate Uranium(IV) Mixed-Ligand Metallocene Complexes using Copper(I) Iodide. Organometallics 2008. [DOI: 10.1021/om800622g] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Thibault Cantat
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545
| | - Brian L. Scott
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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79
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Gaunt AJ, Reilly SD, Enriquez AE, Hayton TW, Boncella JM, Scott BL, Neu MP. Low-valent molecular plutonium halide complexes. Inorg Chem 2008; 47:8412-9. [PMID: 18714989 DOI: 10.1021/ic8009139] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Treatment of plutonium metal with 1.5 equiv of bromine in tetrahydrofuran (thf) led to isolation of PuBr3(thf)4 (1), which is a new versatile synthon for exploration of non-aqueous Pu(III) chemistry. Adventitious water in the system resulted in structural characterization of the eight-coordinate complex [PuBr2(H2O)6][Br] (2). The crystal structure of PuI3(thf)4 (3) has been determined for the first time and is isostructural with UI3(thf)4. Attempts to form a bis(imido) plutonyl(VI) moiety ([Pu(NR)2](2+)) by oxidation of PuI3(py)4 with iodine and (t)BuNH2 resulted in crystallization of the Pu(III) complex [PuI2(thf)4(py)][I3] (4). Dissolution of a Pu(IV) carbonate with a HCl/Et2O solution in thf gave the mixed valent (III/IV) complex salt [PuCl2(thf)5][PuCl5(thf)] (5) as the only tractable product. Oxidation of Pu[N(SiMe3)2]3 with TeCl4 afforded the Pu(IV) complex Pu[N(SiMe3)2]3Cl (6), which may prove to be a useful entry route for investigation of organometallic/non-aqueous tetravalent plutonium chemistry.
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Affiliation(s)
- Andrew J Gaunt
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
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80
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Schelter EJ, Wu R, Scott BL, Thompson JD, Morris DE, Kiplinger JL. Mixed valency in a uranium multimetallic complex. Angew Chem Int Ed Engl 2008; 47:2993-6. [PMID: 18338348 DOI: 10.1002/anie.200705781] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Eric J Schelter
- Los Alamos National Laboratory, MS J514, Los Alamos, NM 87545, USA
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81
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Schelter E, Wu R, Scott B, Thompson J, Morris D, Kiplinger J. Mixed Valency in a Uranium Multimetallic Complex. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200705781] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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83
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Roger M, Belkhiri L, Arliguie T, Thuéry P, Boucekkine A, Ephritikhine M. Uranium and Lanthanide Complexes with the 2-Mercapto Benzothiazolate Ligand: Evidence for a Specific Covalent Binding Site in the Differentiation of Isostructural Lanthanide(III) and Actinide(III) Compounds. Organometallics 2007. [DOI: 10.1021/om7007315] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mathieu Roger
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, CEA/Saclay 91191 Gif-sur-Yvette, France, Laboratoire de Chimie Moléculaire (LACMOM), Département de Chimie, Faculté des Sciences, Université Mentouri de Constantine, BP 325, Route de l’Aéroport Ain El Bey, 25017 Constantine, Algeria, and UMR CNRS 6226 Sciences Chimiques de Rennes, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes, France
| | - Lotfi Belkhiri
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, CEA/Saclay 91191 Gif-sur-Yvette, France, Laboratoire de Chimie Moléculaire (LACMOM), Département de Chimie, Faculté des Sciences, Université Mentouri de Constantine, BP 325, Route de l’Aéroport Ain El Bey, 25017 Constantine, Algeria, and UMR CNRS 6226 Sciences Chimiques de Rennes, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes, France
| | - Thérèse Arliguie
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, CEA/Saclay 91191 Gif-sur-Yvette, France, Laboratoire de Chimie Moléculaire (LACMOM), Département de Chimie, Faculté des Sciences, Université Mentouri de Constantine, BP 325, Route de l’Aéroport Ain El Bey, 25017 Constantine, Algeria, and UMR CNRS 6226 Sciences Chimiques de Rennes, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes, France
| | - Pierre Thuéry
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, CEA/Saclay 91191 Gif-sur-Yvette, France, Laboratoire de Chimie Moléculaire (LACMOM), Département de Chimie, Faculté des Sciences, Université Mentouri de Constantine, BP 325, Route de l’Aéroport Ain El Bey, 25017 Constantine, Algeria, and UMR CNRS 6226 Sciences Chimiques de Rennes, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes, France
| | - Abdou Boucekkine
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, CEA/Saclay 91191 Gif-sur-Yvette, France, Laboratoire de Chimie Moléculaire (LACMOM), Département de Chimie, Faculté des Sciences, Université Mentouri de Constantine, BP 325, Route de l’Aéroport Ain El Bey, 25017 Constantine, Algeria, and UMR CNRS 6226 Sciences Chimiques de Rennes, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes, France
| | - Michel Ephritikhine
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, CEA/Saclay 91191 Gif-sur-Yvette, France, Laboratoire de Chimie Moléculaire (LACMOM), Département de Chimie, Faculté des Sciences, Université Mentouri de Constantine, BP 325, Route de l’Aéroport Ain El Bey, 25017 Constantine, Algeria, and UMR CNRS 6226 Sciences Chimiques de Rennes, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes, France
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84
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Gaunt AJ, Reilly SD, Enriquez AE, Scott BL, Ibers JA, Sekar P, Ingram KIM, Kaltsoyannis N, Neu MP. Experimental and Theoretical Comparison of Actinide and Lanthanide Bonding in M[N(EPR2)2]3 Complexes (M = U, Pu, La, Ce; E = S, Se, Te; R = Ph, iPr, H). Inorg Chem 2007; 47:29-41. [DOI: 10.1021/ic701618a] [Citation(s) in RCA: 159] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrew J. Gaunt
- Chemistry Division, Plutonium Manufacturing and Technology Division, Materials Physics and Applications Division, and Associate Directorate for Chemistry, Life, and Earth Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, and Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Sean D. Reilly
- Chemistry Division, Plutonium Manufacturing and Technology Division, Materials Physics and Applications Division, and Associate Directorate for Chemistry, Life, and Earth Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, and Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Alejandro E. Enriquez
- Chemistry Division, Plutonium Manufacturing and Technology Division, Materials Physics and Applications Division, and Associate Directorate for Chemistry, Life, and Earth Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, and Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Brian L. Scott
- Chemistry Division, Plutonium Manufacturing and Technology Division, Materials Physics and Applications Division, and Associate Directorate for Chemistry, Life, and Earth Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, and Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - James A. Ibers
- Chemistry Division, Plutonium Manufacturing and Technology Division, Materials Physics and Applications Division, and Associate Directorate for Chemistry, Life, and Earth Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, and Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Perumal Sekar
- Chemistry Division, Plutonium Manufacturing and Technology Division, Materials Physics and Applications Division, and Associate Directorate for Chemistry, Life, and Earth Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, and Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Kieran I. M. Ingram
- Chemistry Division, Plutonium Manufacturing and Technology Division, Materials Physics and Applications Division, and Associate Directorate for Chemistry, Life, and Earth Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, and Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Nikolas Kaltsoyannis
- Chemistry Division, Plutonium Manufacturing and Technology Division, Materials Physics and Applications Division, and Associate Directorate for Chemistry, Life, and Earth Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, and Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Mary P. Neu
- Chemistry Division, Plutonium Manufacturing and Technology Division, Materials Physics and Applications Division, and Associate Directorate for Chemistry, Life, and Earth Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, and Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
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85
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Maynadié, J, Berthet JC, Thuéry P, Ephritikhine M. Cyanide Metallocenes of Trivalent f-Elements. Organometallics 2007. [DOI: 10.1021/om061131x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jérôme Maynadié,
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, Laboratoire Claude Fréjacques, CEA/Saclay, 91191 Gif-sur-Yvette, France
| | - Jean-Claude Berthet
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, Laboratoire Claude Fréjacques, CEA/Saclay, 91191 Gif-sur-Yvette, France
| | - Pierre Thuéry
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, Laboratoire Claude Fréjacques, CEA/Saclay, 91191 Gif-sur-Yvette, France
| | - Michel Ephritikhine
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, Laboratoire Claude Fréjacques, CEA/Saclay, 91191 Gif-sur-Yvette, France
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86
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Maynadié, J, Berthet JC, Thuéry P, Ephritikhine M. From Bent to Linear Uranium Metallocenes: Influence of Counterion, Solvent, and Metal Ion Oxidation State. Organometallics 2006. [DOI: 10.1021/om060642g] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jérôme Maynadié,
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, Laboratoire Claude Fréjacques, CEA/Saclay, 91191 Gif-sur-Yvette, France
| | - Jean-Claude Berthet
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, Laboratoire Claude Fréjacques, CEA/Saclay, 91191 Gif-sur-Yvette, France
| | - Pierre Thuéry
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, Laboratoire Claude Fréjacques, CEA/Saclay, 91191 Gif-sur-Yvette, France
| | - Michel Ephritikhine
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, Laboratoire Claude Fréjacques, CEA/Saclay, 91191 Gif-sur-Yvette, France
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87
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Roger M, Barros N, Arliguie T, Thuéry P, Maron L, Ephritikhine M. U(SMes*)n, (n = 3, 4) and Ln(SMes*)3 (Ln = La, Ce, Pr, Nd): Lanthanide(III)/Actinide(III) Differentiation in Agostic Interactions and an Unprecedented η3 Ligation Mode of the Arylthiolate Ligand, from X-ray Diffraction and DFT Analysis. J Am Chem Soc 2006; 128:8790-802. [PMID: 16819872 DOI: 10.1021/ja0584830] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reaction of U(NEt(2))(4) with HS-2,4,6-(t)Bu(3)C(6)H(2) (HSMes) gave U(SMes)(3)(NEt(2))(py) (1), whereas similar treatment of U[N(SiMe(3))SiMe(2)CH(2)][N(SiMe(3))(2)](2) afforded U(SMes)[N(SiMe(3))(2)](3) (2) and U(SMes)(3)[N(SiMe(3))(2)]. The first neutral homoleptic uranium(IV) thiolate to have been crystallographically characterized, U(SMes)(4) (4), was isolated from the reaction of U(BH(4))(4) and KSMes. The first homoleptic thiolate complex of uranium(III), U(SMes)(3) (5), was synthesized by protonolysis of U[N(SiMe(3))(2)](3) with HSMes in cyclohexane. The crystal structure of 5 exhibits the novel eta(3) ligation mode for the arylthiolate ligand. Comparison of the crystal structure of 5 with those of the isomorphous lanthanide congeners Ln(SMes)(3) (Ln = La, Ce, Pr, and Nd) indicates that the U-S, U-C(ipso)(), and U-C(ortho)() bond lengths are shorter than the corresponding ones in the 4f-element analogues, when taking into account the variation in the ionic radii of the metals. The distance between the uranium and the carbon atoms involved in the U...H-C epsilon agostic interaction of each thiolate ligand is shorter, by approximately 0.05 A, than that expected from a purely ionic bonding model. The lanthanide(III)/actinide(III) differentiation was analyzed by density functional theory (DFT). The nature of the M-S bond is shown to be ionic strongly polarized at the sulfur for M = U and iono-covalent (i.e. strongly ionic with low orbital interaction), for M = Ln. The strength of the U...H-C epsilon agostic interaction is proposed to be controlled by the maximization of the interaction between U(+) and S(-) under steric constraints. The eta(3) ligation mode of the arylthiolate ligand is also obtained from DFT.
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Affiliation(s)
- Mathieu Roger
- Service de Chimie Moléculaire, DSM, DRECAM, CNRS URA 331, CEA/Saclay, 91191 Gif-sur-Yvette, France
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88
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Ephritikhine M. The vitality of uranium molecular chemistry at the dawn of the XXIst century. Dalton Trans 2006:2501-16. [PMID: 16718334 DOI: 10.1039/b603463b] [Citation(s) in RCA: 264] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The intent of this Dalton Perspective is to highlight the recent advances in uranium molecular chemistry, with the results reported during the 2000-2006 period. This discipline is currently witnessing an impressive development, together with the theoretical chemistry and solid-state chemistry of the f-elements, and its face has profoundly changed, revealing unsuspected structural and reactivity features. This progress required and was facilitated by the use of new precursors. Studies of low-valent compounds gave a better insight into lanthanide(III)/actinide(III) differentiation and led to the discovery of unusual reactions, including activation of small molecules. A number of tetravalent uranium complexes, in particular polynuclear compounds, have been synthesized, which exhibit exciting structures and physicochemical properties. The potential of uranium(III) and uranium(IV) complexes in catalysis has been confirmed. The uranyl complexes, from mononuclear species to supramolecular assemblies, reveal a variety of novel structures, changing the generally accepted ideas on the coordination geometry and the stability of the UO2(2+) ion.
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Affiliation(s)
- Michel Ephritikhine
- Service de Chimie Moléculaire, DSM, DRECAM, Laboratoire Claude Fréjacques (CNRS URA 331), CEA/Saclay, 91191, Gif-sur-Yvette, France.
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