51
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Hohloch S, Garner ME, Parker BF, Arnold J. New supporting ligands in actinide chemistry: tetramethyltetraazaannulene complexes with thorium and uranium. Dalton Trans 2018; 46:13768-13782. [PMID: 28959804 DOI: 10.1039/c7dt02682j] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We report the synthesis, characterization, and preliminary reactivity of new heteroleptic thorium and uranium complexes supported by the macrocyclic TMTAA ligand (TMTAA = Tetramethyl-tetra-aza-annulene). The dihalide complexes Th(TMTAA)Cl2(THF)2 (1), [UCl2(TMTAA)]2 (2) and U(TMTAA)I2 (3) are further functionalized to the Cp* derivatives ThCp*(TMTAA)Cl (4), UCp*(TMTAA)Cl (5) and UCp*(TMTAA)I (6) (Cp* = pentamethylcyclopentadienide). Compounds 4-6 are also obtained through a one-pot reaction from standard thorium(iv) and uranium(iv) starting materials, Li2TMTAA and KCp*. Complexes 1-6 function as valuable starting materials for salt metathesis chemistry. Treatment of precursors 4 or 5 with trimethylsilylmethyllithium (LiCH2TMS) results in the new actinide TMTAA alkyl complexes ThCp*(TMTAA)(CH2TMS) (7) and UCp*(TMTAA)(CH2TMTS) (8), respectively. The TMTAA-derived alkyl complexes (7 and 8) show unexpected stability and are stable for several weeks at room temperature in solution and in the solid-state. Additionally, double substitution of the halide ligands in 1-3 shows a strong dependence on the nucleophile used. While weaker nucleophiles, such as amides, and more sterically demanding nucleophiles, such as Cp (Cp = cyclopenadienide), favour the formation of bis-TMTAA "sandwich" complexes [An(TMTAA)2] (An = Th (9) and An = U (10)), the use of oxygen-functionalized ligands like the ODipp anion (Dipp = diisopropylphenyl) results in the formation of the doubly substituted species Th(ODipp)2TMTAA (11) and U(ODipp)2TMTAA (12). We also describe the divergent reactivity of the TMTAA ligand towards uranium(iii). Unlike the syntheses of actinide(iv) TMTAA complexes, the synthesis of a uranium(iii) TMTAA was not successful and only uranium(iv) species could be obtained.
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Affiliation(s)
- Stephan Hohloch
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
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52
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NMR spectroscopic study of the adduct formation and reactivity of homoleptic rare earth amides with alkali metal benzyl compounds, and the crystal structures of [Li(TMEDA)2][Nd{N(SiMe3)2}3(CH2Ph)] and [{Li(TMP)}2{Li(Ph)}]2. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2017.10.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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53
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Rookes TM, Wildman EP, Balázs G, Gardner BM, Wooles AJ, Gregson M, Tuna F, Scheer M, Liddle ST. Actinide-Pnictide (An-Pn) Bonds Spanning Non-Metal, Metalloid, and Metal Combinations (An=U, Th; Pn=P, As, Sb, Bi). Angew Chem Int Ed Engl 2018; 57:1332-1336. [PMID: 29232498 PMCID: PMC5814731 DOI: 10.1002/anie.201711824] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Indexed: 12/03/2022]
Abstract
The synthesis and characterisation is presented of the compounds [An(TrenDMBS ){Pn(SiMe3 )2 }] and [An(TrenTIPS ){Pn(SiMe3 )2 }] [TrenDMBS =N(CH2 CH2 NSiMe2 But )3 , An=U, Pn=P, As, Sb, Bi; An=Th, Pn=P, As; TrenTIPS =N(CH2 CH2 NSiPri3 )3 , An=U, Pn=P, As, Sb; An=Th, Pn=P, As, Sb]. The U-Sb and Th-Sb moieties are unprecedented examples of any kind of An-Sb molecular bond, and the U-Bi bond is the first two-centre-two-electron (2c-2e) one. The Th-Bi combination was too unstable to isolate, underscoring the fragility of these linkages. However, the U-Bi complex is the heaviest 2c-2e pairing of two elements involving an actinide on a macroscopic scale under ambient conditions, and this is exceeded only by An-An pairings prepared under cryogenic matrix isolation conditions. Thermolysis and photolysis experiments suggest that the U-Pn bonds degrade by homolytic bond cleavage, whereas the more redox-robust thorium compounds engage in an acid-base/dehydrocoupling route.
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Affiliation(s)
- Thomas M. Rookes
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | | | - Gábor Balázs
- Institute of Inorganic ChemistryUniversity of RegensburgUniversitätsstr.3193053RegensburgGermany
| | - Benedict M. Gardner
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Ashley J. Wooles
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Matthew Gregson
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Floriana Tuna
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Manfred Scheer
- Institute of Inorganic ChemistryUniversity of RegensburgUniversitätsstr.3193053RegensburgGermany
| | - Stephen T. Liddle
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
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54
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Rookes TM, Wildman EP, Balázs G, Gardner BM, Wooles AJ, Gregson M, Tuna F, Scheer M, Liddle ST. Actinide-Pnictide (An−Pn) Bonds Spanning Non-Metal, Metalloid, and Metal Combinations (An=U, Th; Pn=P, As, Sb, Bi). Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201711824] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Thomas M. Rookes
- School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Elizabeth P. Wildman
- School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Gábor Balázs
- Institute of Inorganic Chemistry; University of Regensburg; Universitätsstr.31 93053 Regensburg Germany
| | - Benedict M. Gardner
- 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
| | - Matthew Gregson
- 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
| | - Manfred Scheer
- Institute of Inorganic Chemistry; University of Regensburg; Universitätsstr.31 93053 Regensburg Germany
| | - Stephen T. Liddle
- School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
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55
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Lan W, Wang X, He L, Meng Y, Li J, Qiu B, Nie C. Computational insight into asymmetric uranyl‐salophen coordinated with α, β‐unsaturated aldehydes and ketones. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.4137] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Wen‐Bo Lan
- School of Public HealthXiangnan University Chenzhou Hunan 423000 China
- School of Chemistry and Chemical EngineeringUniversity of South China Hengyang China
| | - Xiao‐Feng Wang
- School of Public HealthXiangnan University Chenzhou Hunan 423000 China
| | - Li‐Ping He
- School of Public HealthXiangnan University Chenzhou Hunan 423000 China
| | - Yan‐Bin Meng
- School of Public HealthXiangnan University Chenzhou Hunan 423000 China
| | - Jun Li
- School of Public HealthXiangnan University Chenzhou Hunan 423000 China
| | - Bin Qiu
- Chenzhou City Center for Disease Control and Prevention Chenzhou Hunan 423000 China
| | - Chang‐Ming Nie
- School of Chemistry and Chemical EngineeringUniversity of South China Hengyang China
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56
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Rookes TM, Gardner BM, Balázs G, Gregson M, Tuna F, Wooles AJ, Scheer M, Liddle ST. Crystalline Diuranium Phosphinidiide and μ-Phosphido Complexes with Symmetric and Asymmetric UPU Cores. Angew Chem Int Ed Engl 2017; 56:10495-10500. [PMID: 28677144 PMCID: PMC5577518 DOI: 10.1002/anie.201706002] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Indexed: 11/11/2022]
Abstract
Reaction of [U(TrenTIPS )(PH2 )] (1, TrenTIPS =N(CH2 CH2 NSiPri3 )3 ) with C6 H5 CH2 K and [U(TrenTIPS )(THF)][BPh4 ] (2) afforded a rare diuranium parent phosphinidiide complex [{U(TrenTIPS )}2 (μ-PH)] (3). Treatment of 3 with C6 H5 CH2 K and two equivalents of benzo-15-crown-5 ether (B15C5) gave the diuranium μ-phosphido complex [{U(TrenTIPS )}2 (μ-P)][K(B15C5)2 ] (4). Alternatively, reaction of [U(TrenTIPS )(PH)][Na(12C4)2 ] (5, 12C4=12-crown-4 ether) with [U{N(CH2 CH2 NSiMe2 But )2 CH2 CH2 NSi(Me)(CH2 )(But )}] (6) produced the diuranium μ-phosphido complex [{U(TrenTIPS )}(μ-P){U(TrenDMBS )}][Na(12C4)2 ] [7, TrenDMBS =N(CH2 CH2 NSiMe2 But )3 ]. Compounds 4 and 7 are unprecedented examples of uranium phosphido complexes outside of matrix isolation studies, and they rapidly decompose in solution underscoring the paucity of uranium phosphido complexes. Interestingly, 4 and 7 feature symmetric and asymmetric UPU cores, respectively, reflecting their differing steric profiles.
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Affiliation(s)
- Thomas M. Rookes
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Benedict M. Gardner
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Gábor Balázs
- Institute of Inorganic ChemistryUniversity of RegensburgUniversitätsstrasse 3193053RegensburgGermany
| | - Matthew Gregson
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Floriana Tuna
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Ashley J. Wooles
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Manfred Scheer
- Institute of Inorganic ChemistryUniversity of RegensburgUniversitätsstrasse 3193053RegensburgGermany
| | - Stephen T. Liddle
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
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57
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Ortu F, Gregson M, Wooles AJ, Mills DP, Liddle ST. Yttrium Methanide and Methanediide Bis(silyl)amide Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00394] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Fabrizio Ortu
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Matthew Gregson
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Ashley J. Wooles
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - David P. Mills
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Stephen T. Liddle
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
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58
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Rookes TM, Gardner BM, Balázs G, Gregson M, Tuna F, Wooles AJ, Scheer M, Liddle ST. Crystalline Diuranium Phosphinidiide and μ-Phosphido Complexes with Symmetric and Asymmetric UPU Cores. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201706002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Thomas M. Rookes
- School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Benedict M. Gardner
- School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Gábor Balázs
- Institute of Inorganic Chemistry; University of Regensburg; Universitätsstrasse 31 93053 Regensburg Germany
| | - Matthew Gregson
- 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
| | - Manfred Scheer
- Institute of Inorganic Chemistry; University of Regensburg; Universitätsstrasse 31 93053 Regensburg Germany
| | - Stephen T. Liddle
- School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
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59
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Zhang C, Yang P, Zhou E, Deng X, Zi G, Walter MD. Reactivity of a Lewis Base Supported Thorium Terminal Imido Metallocene toward Small Organic Molecules. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00212] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Congcong Zhang
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Pikun Yang
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Enwei Zhou
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Xuebin Deng
- 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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60
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Triamidoamine thorium-arsenic complexes with parent arsenide, arsinidiide and arsenido structural motifs. Nat Commun 2017; 8:14769. [PMID: 28276437 PMCID: PMC5347141 DOI: 10.1038/ncomms14769] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 01/30/2017] [Indexed: 11/08/2022] Open
Abstract
Despite a major expansion of uranium-ligand multiple bond chemistry in recent years, analogous complexes involving other actinides (An) remain scarce. For thorium, under ambient conditions only a few multiple bonds to carbon, nitrogen, phosphorus and chalcogenides are reported, and none to arsenic are known; indeed only two complexes with thorium-arsenic single bonds have been structurally authenticated, reflecting the challenges of stabilizing polar linkages at the large thorium ion. Here, we report thorium parent-arsenide (ThAsH2), -arsinidiides (ThAs(H)K and ThAs(H)Th) and arsenido (ThAsTh) linkages stabilized by a bulky triamidoamine ligand. The ThAs(H)K and ThAsTh linkages exhibit polarized-covalent thorium-arsenic multiple bonding interactions, hitherto restricted to cryogenic matrix isolation experiments, and the AnAs(H)An and AnAsAn linkages reported here have no precedent in f-block chemistry. 7s, 6d and 5f orbital contributions to the Th-As bonds are suggested by quantum chemical calculations, and their compositions unexpectedly appear to be tensioned differently compared to phosphorus congeners.
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61
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Wildman EP, Ostrowski JP, King DM, Lewis W, Liddle ST. Uranium–halide and –azide derivatives of the sterically demanding triamidoamine ligand TrenTPS [TrenTPS= {N(CH2CH2NSiPh3)3}3−]. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.07.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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62
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Zhang L, Fang B, Hou G, Zi G, Ding W, Walter MD. Experimental and Computational Studies of a Uranium Metallacyclocumulene. Organometallics 2017. [DOI: 10.1021/acs.organomet.6b00936] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Lei Zhang
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Bo Fang
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Guohua Hou
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Guofu Zi
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Wanjian Ding
- 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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63
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Cleaves PA, Kefalidis CE, Gardner BM, Tuna F, McInnes EJL, Lewis W, Maron L, Liddle ST. Terminal Uranium(V/VI) Nitride Activation of Carbon Dioxide and Carbon Disulfide: Factors Governing Diverse and Well-Defined Cleavage and Redox Reactions. Chemistry 2017; 23:2950-2959. [PMID: 28075505 DOI: 10.1002/chem.201605620] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Indexed: 01/22/2023]
Abstract
The reactivity of terminal uranium(V/VI) nitrides with CE2 (E=O, S) is presented. Well-defined C=E cleavage followed by zero-, one-, and two-electron redox events is observed. The uranium(V) nitride [U(TrenTIPS )(N)][K(B15C5)2 ] (1, TrenTIPS =N(CH2 CH2 NSiiPr3 )3 ; B15C5=benzo-15-crown-5) reacts with CO2 to give [U(TrenTIPS )(O)(NCO)][K(B15C5)2 ] (3), whereas the uranium(VI) nitride [U(TrenTIPS )(N)] (2) reacts with CO2 to give isolable [U(TrenTIPS )(O)(NCO)] (4); complex 4 rapidly decomposes to known [U(TrenTIPS )(O)] (5) with concomitant formation of N2 and CO proposed, with the latter trapped as a vanadocene adduct. In contrast, 1 reacts with CS2 to give [U(TrenTIPS )(κ2 -CS3 )][K(B15C5)2 ] (6), 2, and [K(B15C5)2 ][NCS] (7), whereas 2 reacts with CS2 to give [U(TrenTIPS )(NCS)] (8) and "S", with the latter trapped as Ph3 PS. Calculated reaction profiles reveal outer-sphere reactivity for uranium(V) but inner-sphere mechanisms for uranium(VI); despite the wide divergence of products the initial activation of CE2 follows mechanistically related pathways, providing insight into the factors of uranium oxidation state, chalcogen, and NCE groups that govern the subsequent divergent redox reactions that include common one-electron reactions and a less-common two-electron redox event. Caution, we suggest, is warranted when utilising CS2 as a reactivity surrogate for CO2 .
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Affiliation(s)
- Peter A Cleaves
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Christos E Kefalidis
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse, 31077, France
| | - Benedict M Gardner
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Eric J L McInnes
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - William Lewis
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Laurent Maron
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse, 31077, France
| | - Stephen T Liddle
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
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64
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Jin GB, Malliakas CD, Lin J. Thorium copper phosphides: more diverse metal–phosphorus and phosphorus–phosphorus interactions than U analogues. Dalton Trans 2017; 46:12041-12052. [DOI: 10.1039/c7dt02145c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three new thorium phosphides synthesized through CuI-mediated solid-state reactions exhibit more diverse ion–ion interactions than those in U pnictides.
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Affiliation(s)
- Geng Bang Jin
- Chemical Sciences and Engineering Division
- Argonne National Laboratory
- Argonne
- USA
| | - Christos D. Malliakas
- Chemical Sciences and Engineering Division
- Argonne National Laboratory
- Argonne
- USA
- Department of Chemistry
| | - Jian Lin
- Chemical Sciences and Engineering Division
- Argonne National Laboratory
- Argonne
- USA
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65
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Zhang L, Hou G, Zi G, Ding W, Walter MD. Preparation of a uranium metallacyclocumulene and its reactivity towards unsaturated organic molecules. Dalton Trans 2017; 46:3716-3728. [DOI: 10.1039/c7dt00396j] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Steric and electronic properties of the coordinated ligands exert a pronounced influence on the reactivity of the uranium metallacyclocumulene complexes.
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Affiliation(s)
- Lei Zhang
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Guohua Hou
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Guofu Zi
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Wanjian Ding
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Marc D. Walter
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
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66
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Hohloch S, Pankhurst JR, Jaekel EE, Parker BF, Lussier DJ, Garner ME, Booth CH, Love JB, Arnold J. Benzoquinonoid-bridged dinuclear actinide complexes. Dalton Trans 2017; 46:11615-11625. [PMID: 28831470 DOI: 10.1039/c7dt02728a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the coordination chemistry of benzoquinonoid-bridged dinluclear thorium(iv) and uranium(iv) complexes with the tripodal ligand tris[2-amido(2-pyridyl)ethyl]amine ligand,L.
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Affiliation(s)
- Stephan Hohloch
- Department of Chemistry
- University of California
- Berkeley
- USA
- Chemical Sciences Division
| | - James R. Pankhurst
- Department of Chemistry
- University of California
- Berkeley
- USA
- Chemical Sciences Division
| | | | - Bernard F. Parker
- Department of Chemistry
- University of California
- Berkeley
- USA
- Chemical Sciences Division
| | - Daniel J. Lussier
- Department of Chemistry
- University of California
- Berkeley
- USA
- Chemical Sciences Division
| | - Mary E. Garner
- Department of Chemistry
- University of California
- Berkeley
- USA
- Chemical Sciences Division
| | - Corwin H. Booth
- Chemical Sciences Division
- Lawrence Berkeley National Laboratory
- Berkeley
- USA
| | - Jason B. Love
- EaStCHEM School of Chemistry
- The University of Edinburgh
- Edinburgh
- UK
| | - John Arnold
- Department of Chemistry
- University of California
- Berkeley
- USA
- Chemical Sciences Division
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67
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Thorium-phosphorus triamidoamine complexes containing Th-P single- and multiple-bond interactions. Nat Commun 2016; 7:12884. [PMID: 27682617 PMCID: PMC5056418 DOI: 10.1038/ncomms12884] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 08/09/2016] [Indexed: 11/09/2022] Open
Abstract
Despite the burgeoning field of uranium-ligand multiple bonds, analogous complexes involving other actinides remain scarce. For thorium, under ambient conditions only a few multiple bonds to carbon, nitrogen, oxygen, sulfur, selenium and tellurium are reported, and no multiple bonds to phosphorus are known, reflecting a general paucity of synthetic methodologies and also problems associated with stabilising these linkages at the large thorium ion. Here we report structurally authenticated examples of a parent thorium(IV)-phosphanide (Th-PH2), a terminal thorium(IV)-phosphinidene (Th=PH), a parent dithorium(IV)-phosphinidiide (Th-P(H)-Th) and a discrete actinide-phosphido complex under ambient conditions (Th=P=Th). Although thorium is traditionally considered to have dominant 6d-orbital contributions to its bonding, contrasting to majority 5f-orbital character for uranium, computational analyses suggests that the bonding of thorium can be more nuanced, in terms of 5f- versus 6d-orbital composition and also significant involvement of the 7s-orbital and how this affects the balance of 5f- versus 6d-orbital bonding character.
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68
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Brown JL, Gaunt AJ, King DM, Liddle ST, Reilly SD, Scott BL, Wooles AJ. Neptunium and plutonium complexes with a sterically encumbered triamidoamine (TREN) scaffold. Chem Commun (Camb) 2016; 52:5428-31. [PMID: 27009799 DOI: 10.1039/c6cc01656a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The syntheses and characterisation of isostructural neptunium(iv) and plutonium(iv) complexes [An(IV)(TREN(TIPS))(Cl)] [An = Np, Pu; TREN(TIPS) = {N(CH2CH2NSiPr(i)3)3}(3-)] are reported, along with the demonstration that they are likely reduced to the corresponding neptunium(iii) and plutonium(iii) products [An(III)(TREN(TIPS))]; this chemistry provides new platforms from which to target a plethora of unprecedented molecular functionalities in transuranic chemistry and the neptunium(iv) molecule is the first structurally characterised neptunium(iv)-amide complex.
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Affiliation(s)
- Jessie L Brown
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
| | - Andrew J Gaunt
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
| | - David M King
- 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.
| | - Sean D Reilly
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
| | - Brian L Scott
- Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Ashley J Wooles
- School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
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69
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Yang P, Zhou E, Hou G, Zi G, Ding W, Walter MD. Experimental and Computational Studies on the Formation of Thorium-Copper Heterobimetallics. Chemistry 2016; 22:13845-13849. [DOI: 10.1002/chem.201603519] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Pikun Yang
- Department of Chemistry; Beijing Normal University; Beijing 100875 P.R. China
| | - Enwei Zhou
- Department of Chemistry; Beijing Normal University; Beijing 100875 P.R. China
| | - Guohua Hou
- Department of Chemistry; Beijing Normal University; Beijing 100875 P.R. China
| | - Guofu Zi
- Department of Chemistry; Beijing Normal University; Beijing 100875 P.R. China
| | - Wanjian Ding
- Department of Chemistry; Beijing Normal University; Beijing 100875 P.R. China
| | - Marc D. Walter
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
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70
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Extending Stannyl Anion Chemistry to the Actinides: Synthesis and Characterization of a Uranium-Tin Bond. Inorg Chem 2016; 55:5534-9. [PMID: 27219499 DOI: 10.1021/acs.inorgchem.6b00543] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have synthesized a rare example of a uranium(IV) stannyl (κ(4)-N(CH2CH2NSi((i)Pr)3)3U(SnMe3), 1) via transmetalation with LiSnMe3. This complex has been characterized crystallographically and shown to have a U-Sn bond length of 3.3130(3) Å, substantially longer than the only other crystallographically observed U-Sn bond (3.166 Å). Computational studies suggest that the U-Sn bond in 1 is highly polarized, with significant charge transfer to the stannylate ligand. We briefly discuss plausible mechanistic scenarios for the formation of 1, which may be relevant to other transmetalation processes involving heavy main group atoms. Furthermore, we demonstrate the reducing ability of [SnMe3](-) in the absence of strongly donating ligands on U(IV).
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71
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Zhang L, Hou G, Zi G, Ding W, Walter MD. Influence of the 5f Orbitals on the Bonding and Reactivity in Organoactinides: Experimental and Computational Studies on a Uranium Metallacyclopropene. J Am Chem Soc 2016; 138:5130-42. [PMID: 27070508 DOI: 10.1021/jacs.6b01391] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis, structure, and reactivity of a uranium metallacyclopropene were comprehensively studied. Reduction of (η(5)-C5Me5)2UCl2 (1) with potassium graphite (KC8) in the presence of bis(trimethylsilyl)acetylene (Me3SiC≡CSiMe3) allows the first stable uranium metallacyclopropene (η(5)-C5Me5)2U[η(2)-C2(SiMe3)2] (2) to be isolated. Magnetic susceptibility data confirm that 2 is a U(IV) complex, and density functional theory (DFT) studies indicate substantial 5f orbital contributions to the bonding of the metallacyclopropene U-(η(2)-C═C) moiety, leading to more covalent bonds between the (η(5)-C5Me5)2U(2+) and [η(2)-C2(SiMe3)2](2-) fragments than those in the related Th(IV) compound. Consequently, very different reactivity patterns emerge, e.g., 2 can act as a source for the (η(5)-C5Me5)2U(II) fragment when reacted with alkynes and a variety of heterounsaturated molecules such as imines, bipy, carbodiimide, organic azides, hydrazine, and azo derivatives.
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Affiliation(s)
- Lei Zhang
- Department of Chemistry, Beijing Normal University , Beijing 100875, China
| | - Guohua Hou
- Department of Chemistry, Beijing Normal University , Beijing 100875, China
| | - Guofu Zi
- Department of Chemistry, Beijing Normal University , Beijing 100875, China
| | - Wanjian Ding
- 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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72
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Fang B, Hou G, Zi G, Ding W, Walter MD. Steric and Electronic Influences of Internal Alkynes on the Formation of Thorium Metallacycles: A Combined Experimental and Computational Study. Organometallics 2016. [DOI: 10.1021/acs.organomet.5b00945] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bo Fang
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Guohua Hou
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Guofu Zi
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Wanjian Ding
- 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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73
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Zhang L, Fang B, Hou G, Ai L, Ding W, Walter MD, Zi G. Intrinsic reactivity of a uranium metallacyclopropene toward unsaturated organic molecules. Dalton Trans 2016; 45:16441-16452. [DOI: 10.1039/c6dt03005j] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A uranium metallacyclopropene shows a rich chemistry in the activation of small molecules by two electron transfer processes.
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Affiliation(s)
- Lei Zhang
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Bo Fang
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Guohua Hou
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Lin Ai
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Wanjian Ding
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Marc D. Walter
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Guofu Zi
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
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74
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Edelmann FT. Lanthanides and actinides: Annual survey of their organometallic chemistry covering the year 2014. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.07.017] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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75
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Latouche C, Barone V. Computational Chemistry Meets Experiments for Explaining the Behavior of Bibenzyl: A Thermochemical and Spectroscopic (Infrared, Raman, and NMR) Investigation. J Chem Theory Comput 2015; 10:5586-92. [PMID: 26583241 DOI: 10.1021/ct500930b] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The structure, conformational behavior, and spectroscopic parameters of bibenzyl have been investigated by a computational protocol including proper treatment of anharmonic and hindered rotor contributions. Conventional hybrid functionals overstabilize the anti conformer while low-order post-Hartree-Fock (MP2) approaches strongly favor the gauche conformer. However, inclusion of semiempirical dispersion effects in density functionals or coupled cluster post-Hartree-Fock models agree in forecasting the simultaneous presence of both conformers in the gas phase with a slightly larger stability (0.7 kcal·mol(-1)) of the gauche conformer. Addition of thermal and entropic effects finally leads to very close Gibbs free energies for both conformers and, thus, to a slight preference for the gauche form due to statistical factors (2 vs 1). The situation remains essentially the same in solution. On these grounds, perturbative vibrational computations including both electrical and mechanical anharmonicities lead to IR and Raman spectra in remarkable agreement with experiment. Full assignment of the IR spectra explains the presence of peaks from gauche or anti conformers. Comparison between computed and experimental Raman spectra confirms that both conformers are present in liquid phase, whereas the anti conformer seems to be preponderant in the solid state. Also computed NMR parameters are in good agreement with experiment.
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Affiliation(s)
- Camille Latouche
- Chemistry, Faculty of Science, Scuola normale Superiore di Pisa , Piazza dei Cavalieri 7, 56126 Pisa PI, Italy
| | - Vincenzo Barone
- Chemistry, Faculty of Science, Scuola normale Superiore di Pisa , Piazza dei Cavalieri 7, 56126 Pisa PI, Italy
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76
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Fang B, Zhang L, Hou G, Zi G, Fang DC, Walter MD. Experimental and Computational Studies on an Actinide Metallacyclocumulene Complex. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00923] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bo Fang
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Lei Zhang
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Guohua Hou
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Guofu Zi
- Department
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - De-Cai Fang
- 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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77
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Fang B, Zhang L, Hou G, Zi G, Fang DC, Walter MD. C-H bond activation induced by thorium metallacyclopropene complexes: a combined experimental and computational study. Chem Sci 2015; 6:4897-4906. [PMID: 29142721 PMCID: PMC5664364 DOI: 10.1039/c5sc01684c] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Accepted: 06/10/2015] [Indexed: 01/13/2023] Open
Abstract
Inter- and intramolecular C-H bond activations by thorium metallacyclopropene complexes were comprehensively studied. The reduction of [η5-1,2,4-(Me3C)3C5H2]2ThCl2 (1) with potassium graphite (KC8) in the presence of internal alkynes (PhC[triple bond, length as m-dash]CR) yields the corresponding thorium metallacyclopropenes [η5-1,2,4-(Me3C)3C5H2]2Th(η2-C2Ph(R)) (R = Ph (2), Me (3), iPr (4), C6H11 (5)). Complexes 3-5 derived from phenyl(alkyl)acetylenes are very reactive resulting in an intramolecular C-H bond activation of the 1,2,4-(Me3C)3C5H2 ligand. In contrast, no intramolecular C-H bond activation is observed for the diphenylacetylene derived complex 2, but it does activate α-C-H bonds in pyridine or carbonyl derivatives upon coordination. Density functional theory (DFT) studies complement the experimental studies and provide additional insights into the observed reactivity.
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Affiliation(s)
- Bo Fang
- Department of Chemistry , Beijing Normal University , Beijing 100875 , China . ; ; ; Tel: +86-10-58806051
| | - Lei Zhang
- Department of Chemistry , Beijing Normal University , Beijing 100875 , China . ; ; ; Tel: +86-10-58806051
| | - Guohua Hou
- Department of Chemistry , Beijing Normal University , Beijing 100875 , China . ; ; ; Tel: +86-10-58806051
| | - Guofu Zi
- Department of Chemistry , Beijing Normal University , Beijing 100875 , China . ; ; ; Tel: +86-10-58806051
| | - De-Cai Fang
- Department of Chemistry , Beijing Normal University , Beijing 100875 , China . ; ; ; Tel: +86-10-58806051
| | - Marc D Walter
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany . ; ; Tel: +49-531-3915312
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78
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Zhou E, Ren W, Hou G, Zi G, Fang DC, Walter MD. Small Molecule Activation Mediated by a Thorium Terminal Imido Metallocene. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00454] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Enwei Zhou
- Department of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Wenshan Ren
- Department of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Guohua Hou
- Department of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Guofu Zi
- Department of Chemistry, Beijing Normal University, Beijing 100875, China
| | - De-Cai Fang
- 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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79
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Liddle ST. The Renaissance of Non-Aqueous Uranium Chemistry. Angew Chem Int Ed Engl 2015; 54:8604-41. [PMID: 26079536 DOI: 10.1002/anie.201412168] [Citation(s) in RCA: 347] [Impact Index Per Article: 38.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 01/29/2015] [Indexed: 12/11/2022]
Abstract
Prior to the year 2000, non-aqueous uranium chemistry mainly involved metallocene and classical alkyl, amide, or alkoxide compounds as well as established carbene, imido, and oxo derivatives. Since then, there has been a resurgence of the area, and dramatic developments of supporting ligands and multiply bonded ligand types, small-molecule activation, and magnetism have been reported. This Review 1) introduces the reader to some of the specialist theories of the area, 2) covers all-important starting materials, 3) surveys contemporary ligand classes installed at uranium, including alkyl, aryl, arene, carbene, amide, imide, nitride, alkoxide, aryloxide, and oxo compounds, 4) describes advances in the area of single-molecule magnetism, and 5) summarizes the coordination and activation of small molecules, including carbon monoxide, carbon dioxide, nitric oxide, dinitrogen, white phosphorus, and alkanes.
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Affiliation(s)
- Stephen T Liddle
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD (UK).
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80
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81
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Gardner BM, Balázs G, Scheer M, Tuna F, McInnes EJL, McMaster J, Lewis W, Blake AJ, Liddle ST. Triamidoamine uranium(IV)-arsenic complexes containing one-, two- and threefold U-As bonding interactions. Nat Chem 2015; 7:582-90. [PMID: 26100807 DOI: 10.1038/nchem.2279] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Accepted: 05/11/2015] [Indexed: 11/09/2022]
Abstract
To further our fundamental understanding of the nature and extent of covalency in uranium-ligand bonding, and the benefits that this may have for the design of new ligands for nuclear waste separation, there is burgeoning interest in the nature of uranium complexes with soft- and multiple-bond-donor ligands. Despite this, there have so far been no examples of structurally authenticated molecular uranium-arsenic bonds under ambient conditions. Here, we report molecular uranium(IV)-arsenic complexes featuring formal single, double and triple U-As bonding interactions. Compound formulations are supported by a range of characterization techniques, and theoretical calculations suggest the presence of polarized covalent one-, two- and threefold bonding interactions between uranium and arsenic in parent arsenide [U-AsH2], terminal arsinidene [U=AsH] and arsenido [U≡AsK2] complexes, respectively. These studies inform our understanding of the bonding of actinides with soft donor ligands and may be of use in future ligand design in this area.
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Affiliation(s)
- Benedict M Gardner
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Gábor Balázs
- Institut of Inorganic Chemistry, University of Regensburg, Universitaets Strasse 31, Regensburg 93053, Germany
| | - Manfred Scheer
- Institut of Inorganic Chemistry, University of Regensburg, Universitaets Strasse 31, Regensburg 93053, Germany
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Eric J L McInnes
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Jonathan McMaster
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - William Lewis
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Alexander J Blake
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Stephen T Liddle
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK
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82
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Gardner BM, Tuna F, McInnes EJL, McMaster J, Lewis W, Blake AJ, Liddle ST. An Inverted-Sandwich Diuranium μ-η 5:η 5-Cyclo-P 5 Complex Supported by U-P 5 δ-Bonding. ANGEWANDTE CHEMIE (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 127:7174-7178. [PMID: 27478265 PMCID: PMC4955234 DOI: 10.1002/ange.201501728] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 03/13/2015] [Indexed: 11/24/2022]
Abstract
Reaction of [U(TrenTIPS)] [1, TrenTIPS=N(CH2CH2NSiiPr3)3] with 0.25 equivalents of P4 reproducibly affords the unprecedented actinide inverted sandwich cyclo-P5 complex [{U(TrenTIPS)}2(μ-η5:η5-cyclo-P5)] (2). All prior examples of cyclo-P5 are stabilized by d-block metals, so 2 shows that cyclo-P5 does not require d-block ions to be prepared. Although cyclo-P5 is isolobal to cyclopentadienyl, which usually bonds to metals via σ- and π-interactions with minimal δ-bonding, theoretical calculations suggest the principal bonding in the U(P5)U unit is polarized δ-bonding. Surprisingly, the characterization data are overall consistent with charge transfer from uranium to the cyclo-P5 unit to give a cyclo-P5 charge state that approximates to a dianionic formulation. This is ascribed to the larger size and superior acceptor character of cyclo-P5 compared to cyclopentadienyl, the strongly reducing nature of uranium(III), and the availability of uranium δ-symmetry 5f orbitals.
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Affiliation(s)
- Benedict M. Gardner
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD (UK)
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester, M13 9PL (UK)
| | - Eric J. L. McInnes
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester, M13 9PL (UK)
| | - Jonathan McMaster
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD (UK)
| | - William Lewis
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD (UK)
| | - Alexander J. Blake
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD (UK)
| | - Stephen T. Liddle
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD (UK)
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83
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Abstract
Triamidoamine (Tren) complexes of the p- and d-block elements have been well-studied, and they display a diverse array of chemistry of academic, industrial and biological significance. Such in-depth investigations are not as widespread for Tren complexes of uranium, despite the general drive to better understand the chemical behaviour of uranium by virtue of its fundamental position within the nuclear sector. However, the chemistry of Tren-uranium complexes is characterised by the ability to stabilise otherwise reactive, multiply bonded main group donor atom ligands, construct uranium-metal bonds, promote small molecule activation, and support single molecule magnetism, all of which exploit the steric, electronic, thermodynamic and kinetic features of the Tren ligand system. This Feature Article presents a current account of the chemistry of Tren-uranium complexes.
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Affiliation(s)
- Benedict M Gardner
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
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84
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Gardner BM, Tuna F, McInnes EJL, McMaster J, Lewis W, Blake AJ, Liddle ST. An Inverted-Sandwich Diuranium μ-η(5):η(5)-Cyclo-P5 Complex Supported by U-P5 δ-Bonding. Angew Chem Int Ed Engl 2015; 54:7068-72. [PMID: 25914060 PMCID: PMC4517156 DOI: 10.1002/anie.201501728] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 03/13/2015] [Indexed: 11/19/2022]
Abstract
Reaction of [U(TrenTIPS)] [1, TrenTIPS=N(CH2CH2NSiiPr3)3] with 0.25 equivalents of P4 reproducibly affords the unprecedented actinide inverted sandwich cyclo-P5 complex [{U(TrenTIPS)}2(μ-η5:η5-cyclo-P5)] (2). All prior examples of cyclo-P5 are stabilized by d-block metals, so 2 shows that cyclo-P5 does not require d-block ions to be prepared. Although cyclo-P5 is isolobal to cyclopentadienyl, which usually bonds to metals via σ- and π-interactions with minimal δ-bonding, theoretical calculations suggest the principal bonding in the U(P5)U unit is polarized δ-bonding. Surprisingly, the characterization data are overall consistent with charge transfer from uranium to the cyclo-P5 unit to give a cyclo-P5 charge state that approximates to a dianionic formulation. This is ascribed to the larger size and superior acceptor character of cyclo-P5 compared to cyclopentadienyl, the strongly reducing nature of uranium(III), and the availability of uranium δ-symmetry 5f orbitals.
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Affiliation(s)
- Benedict M Gardner
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD (UK)
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester, M13 9PL (UK)
| | - Eric J L McInnes
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester, M13 9PL (UK)
| | - Jonathan McMaster
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD (UK)
| | - William Lewis
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD (UK)
| | - Alexander J Blake
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD (UK)
| | - Stephen T Liddle
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD (UK).
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85
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Gardner BM, Lewis W, Blake AJ, Liddle ST. Thorium Triamidoamine Complexes: Synthesis of an Unusual Dinuclear Tuck-in–Tuck-over Thorium Metallacycle Featuring the Longest Known Thorium−σ-Alkyl Bond. Organometallics 2015. [DOI: 10.1021/om501177s] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Benedict M. Gardner
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - William Lewis
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Alexander J. Blake
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
| | - Stephen T. Liddle
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K
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86
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Fang B, Hou G, Zi G, Fang DC, Walter MD. A thorium metallacyclopentadiene complex: a combined experimental and computational study. Dalton Trans 2015; 44:7927-34. [DOI: 10.1039/c5dt00838g] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The first thorium metallacyclopentadiene complex was prepared and its reactivity was investigated.
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Affiliation(s)
- Bo Fang
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Guohua Hou
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Guofu Zi
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - De-Cai Fang
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- China
| | - Marc D. Walter
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
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87
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Johnson SA, Bart SC. Achievements in uranium alkyl chemistry: celebrating sixty years of synthetic pursuits. Dalton Trans 2015; 44:7710-26. [PMID: 25283733 DOI: 10.1039/c4dt01621a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This Perspective highlights the synthesis, characterization, and reactivity of significant organouranium complexes with σ-bonded alkyl ligands.
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Affiliation(s)
- Sara A. Johnson
- 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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88
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Affiliation(s)
- Douglas R Kindra
- Department of Chemistry, University of California , Irvine, California 92697-2025, United States
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Batke S, Sietzen M, Wadepohl H, Ballmann J. A tripodal benzylene-linked trisamidophosphine ligand scaffold: synthesis and coordination chemistry with group(IV) metals. Inorg Chem 2014; 53:4144-53. [PMID: 24712705 DOI: 10.1021/ic500163c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A new tripodal trisamidophosphine ligand (1) based on the trisbenzylphosphine backbone has been synthesized in three steps starting from NaPH2 and phthaloyl-protected 2-aminobenzyl bromide. At elevated temperatures, 1 reacts directly with M(NMe2)4 (M = Zr, Hf) to afford the dimethylamido complexes [PN3]M(NMe2) (M = Zr, Hf) (2), which are easily converted into the corresponding triflates [PN3]MOTf (M = Zr, Hf) (3) via reaction with triethylsilyl trifluoromethanesulfonate. The related titanium chloro complex [PN3]TiCl (4-Ti) is obtained from 1 and Bn3TiCl via protonolysis. Triple deprotonation of 1 with n-butyllithium affords the tris-lithium salt Li3[PN3] (1-Li), which serves as a common starting material for the preparation of all the group(IV) chlorides [PN3]MCl (M = Ti, Zr, Hf) (4). Upon treatment of 4-Ti with Bn2Mg(thf)2, formation of a benzyltitanium species is observed, which is converted cleanly into a ligand-CH-activated species (5-Ti).
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Affiliation(s)
- Sonja Batke
- Anorganisch-Chemisches Institut, Universität Heidelberg , Im Neuenheimer Feld 276, 69120 Heidelberg, Germany
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