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Title: Chemical structure and bonding in a thorium( iii )–aluminum heterobimetallic complex

Abstract

Thorium sits at a unique position on the periodic table. On one hand, there is little evidence that its 5f orbitals engage in bonding as they do in other early actinides; on the other hand, its chemistry is distinct from Lewis acidic transition metals. To gain insight into the underlying electronic structure of Th and develop trends across the actinide series, it is useful to study Th(III) and Th(II) systems with valence electrons that may engage in non-electrostatic metal–ligand interactions, although only a handful of such systems are known. To expand the range of low-valent compounds and gain deeper insight into Th electronic structure, we targeted actinide bimetallic complexes containing metal–metal bonds. Here in this paper, we report the syntheses of Th–Al bimetallics from reactions between a di-tert-butylcyclopentadienyl supported Th(IV) dihalide (Cp‡2ThCl2) and an anionic aluminum hydride salt [K(H3AlC(SiMe3)3)]. Reduction of the [Th(IV)](Cl)–[Al] product resulted in a [Th(III)]–[Al] complex [Cp‡2Th(μ-H3)AlC(SiMe3)3]. The U(III) analogue [Cp‡2U(μ-H3)AlC(SiMe3)3] could be synthesized directly from a U(III) halide starting material. Electron paramagnetic resonance studies on 4 demonstrate hyperfine interactions between the unpaired electron and the Al atom indicative of spin density delocalization from the Th metal center to the Al. Density functional theory and atom inmore » molecules calculations confirmed the presence of An→Al interactions in 4 and 5, which represents the first examples of An→M interactions where the actinide behaves as an electron donor.« less

Authors:
 [1];  [2]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [1]
  1. Department of Chemistry, University of California, Berkeley, USA, Chemical Sciences Division
  2. Department of Chemistry, University of California, Berkeley, USA
  3. Department of Chemistry, University of California, Davis, USA
  4. LPCNO, Université de Toulouse, INAS Toulouse, Toulouse, France
  5. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USA
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1434399
Alternate Identifier(s):
OSTI ID: 1461125
Grant/Contract Number:  
AC02-05CH11231; NA0003180; NA0000979
Resource Type:
Published Article
Journal Name:
Chemical Science
Additional Journal Information:
Journal Name: Chemical Science Journal Volume: 9 Journal Issue: 18; Journal ID: ISSN 2041-6520
Publisher:
Royal Society of Chemistry (RSC)
Country of Publication:
United Kingdom
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Altman, Alison B., Brown, Alexandra C., Rao, Guodong, Lohrey, Trevor D., Britt, R. David, Maron, Laurent, Minasian, Stefan G., Shuh, David K., and Arnold, John. Chemical structure and bonding in a thorium( iii )–aluminum heterobimetallic complex. United Kingdom: N. p., 2018. Web. doi:10.1039/C8SC01260A.
Altman, Alison B., Brown, Alexandra C., Rao, Guodong, Lohrey, Trevor D., Britt, R. David, Maron, Laurent, Minasian, Stefan G., Shuh, David K., & Arnold, John. Chemical structure and bonding in a thorium( iii )–aluminum heterobimetallic complex. United Kingdom. https://doi.org/10.1039/C8SC01260A
Altman, Alison B., Brown, Alexandra C., Rao, Guodong, Lohrey, Trevor D., Britt, R. David, Maron, Laurent, Minasian, Stefan G., Shuh, David K., and Arnold, John. Mon . "Chemical structure and bonding in a thorium( iii )–aluminum heterobimetallic complex". United Kingdom. https://doi.org/10.1039/C8SC01260A.
@article{osti_1434399,
title = {Chemical structure and bonding in a thorium( iii )–aluminum heterobimetallic complex},
author = {Altman, Alison B. and Brown, Alexandra C. and Rao, Guodong and Lohrey, Trevor D. and Britt, R. David and Maron, Laurent and Minasian, Stefan G. and Shuh, David K. and Arnold, John},
abstractNote = {Thorium sits at a unique position on the periodic table. On one hand, there is little evidence that its 5f orbitals engage in bonding as they do in other early actinides; on the other hand, its chemistry is distinct from Lewis acidic transition metals. To gain insight into the underlying electronic structure of Th and develop trends across the actinide series, it is useful to study Th(III) and Th(II) systems with valence electrons that may engage in non-electrostatic metal–ligand interactions, although only a handful of such systems are known. To expand the range of low-valent compounds and gain deeper insight into Th electronic structure, we targeted actinide bimetallic complexes containing metal–metal bonds. Here in this paper, we report the syntheses of Th–Al bimetallics from reactions between a di-tert-butylcyclopentadienyl supported Th(IV) dihalide (Cp‡2ThCl2) and an anionic aluminum hydride salt [K(H3AlC(SiMe3)3)]. Reduction of the [Th(IV)](Cl)–[Al] product resulted in a [Th(III)]–[Al] complex [Cp‡2Th(μ-H3)AlC(SiMe3)3]. The U(III) analogue [Cp‡2U(μ-H3)AlC(SiMe3)3] could be synthesized directly from a U(III) halide starting material. Electron paramagnetic resonance studies on 4 demonstrate hyperfine interactions between the unpaired electron and the Al atom indicative of spin density delocalization from the Th metal center to the Al. Density functional theory and atom in molecules calculations confirmed the presence of An→Al interactions in 4 and 5, which represents the first examples of An→M interactions where the actinide behaves as an electron donor.},
doi = {10.1039/C8SC01260A},
journal = {Chemical Science},
number = 18,
volume = 9,
place = {United Kingdom},
year = {Mon Jan 01 00:00:00 EST 2018},
month = {Mon Jan 01 00:00:00 EST 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1039/C8SC01260A

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Cited by: 24 works
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Figures / Tables:

Scheme 1 Scheme 1: Synthesis of 2 and 3.

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Works referencing / citing this record:

[Al t Bu] −6: EPR Spectroscopic Evidence and Ab Initio Calculations
journal, October 1993

  • Dohmeier, Carsten; Mocker, Mario; Schnöckel, Hansgeorg
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Synthesis and Properties of a Fifteen-Coordinate Complex: The Thorium Aminodiboranate [Th(H3BNMe2BH3)4]
journal, March 2010

  • Daly, Scott R.; Piccoli, Paula M. B.; Schultz, Arthur J.
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Comparison of the Reactivity of 2-Li-C 6 H 4 CH 2 NMe 2 with MCl 4 (M=Th, U): Isolation of a Thorium Aryl Complex or a Uranium Benzyne Complex
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Synthesis and Characterization of a Uranium(II) Monoarene Complex Supported by δ  Backbonding
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Molecular Single-Bond Covalent Radii for Elements 1-118
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Experimental and Computational Studies on the Formation of Thorium-Copper Heterobimetallics
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Dinitrogen Activation at Iron and Cobalt Metallalumatranes
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Synthesis, structure, and catalytic activity of an organothorium hydride complex
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Ca(BH4)2 as a simple tool for the preparation of thorium and uranium metallocene borohydride complexes: First synthesis and crystal structure of (C5Me5)2Th(η3-H3BH)2
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  • Erickson, Karla A.; Scott, Brian L.; Kiplinger, Jaqueline L.
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A comparative study of the reactivity of Zr(IV), Hf(IV) and Th(IV) metallocene complexes: Thorium is not a Group IV metal after all
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  • DOI: 10.1016/j.jallcom.2007.03.138

A New Supporting Ligand in Actinide Chemistry Leads to Reactive Bis(NHC)borate-Supported Thorium Complexes
journal, August 2016


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journal, July 1991

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Density Functional Theory Studies of the Electronic Structure of Solid State Actinide Oxides
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Importance of Energy Level Matching for Bonding in Th 3+ -Am 3+ Actinide Metallocene Amidinates, (C 5 Me 5 ) 2 [ i PrNC(Me)N i Pr]An
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Does Covalency Increase or Decrease across the Actinide Series? Implications for Minor Actinide Partitioning
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Systematic Investigation of Thorium(IV)– and Uranium(IV)–Ligand Bonding in Dithiophosphonate, Thioselenophosphinate, and Diselenophosphonate Complexes
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Preparation and Reactivity of the Versatile Uranium(IV) Imido Complexes U(NAr)Cl 2 (R 2 bpy) 2 (R = Me, t Bu) and U(NAr)Cl 2 (tppo) 3
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Bonding of tris(.eta.5-cyclopentadienyl)-actinide complexes. 3. Interaction of .pi.-neutral, .pi.-acidic, and .pi.-basic ligands with (.eta.5-C5H5)3U
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[Th(III)[.eta.5-C5H3(SiMe3)2]3], an actinide compound with a 6d1 ground state
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Synthesis and x-ray structure of (C5Me5)2Th(.mu.-PPh2)2Pt(PMe3): a complex with a thorium-platinum bond
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Metal-metal bonds involving actinides. Synthesis and characterization of a complex having an unsupported actinide to transition metal bond
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Metal–Alane Adducts with Zero-Valent Nickel, Cobalt, and Iron
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Photochemical Route to Actinide-Transition Metal Bonds: Synthesis, Characterization and Reactivity of a Series of Thorium and Uranium Heterobimetallic Complexes
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A Heterobimetallic Complex With an Unsupported Uranium(III)−Aluminum(I) Bond: (CpSiMe 3 ) 3 U−AlCp* (Cp* = C 5 Me 5 )
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Evidence for the Involvement of 5f Orbitals in the Bonding and Reactivity of Organometallic Actinide Compounds: Thorium(IV) and Uranium(IV) Bis(hydrazonato) Complexes
journal, December 2008

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Trends in Covalency for d- and f-Element Metallocene Dichlorides Identified Using Chlorine K-Edge X-ray Absorption Spectroscopy and Time-Dependent Density Functional Theory
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A Comparison of 4 f vs 5 f Metal−Metal Bonds in (CpSiMe 3 ) 3 M−ECp* (M = Nd, U; E = Al, Ga; Cp* = C 5 Me 5 ): Synthesis, Thermodynamics, Magnetism, and Electronic Structure
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Synthesis and Characterization of the First Sandwich Complex of Trivalent Thorium:  A Structural Comparison with the Uranium Analogue
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Thorium Mono- and Bis(imido) Complexes Made by Reprotonation of cyclo -Metalated Amides
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Formation of a Bridging Phosphinidene Thorium Complex
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Expanding Thorium Hydride Chemistry Through Th 2+ , Including the Synthesis of a Mixed-Valent Th 4+ /Th 3+ Hydride Complex
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Synthesis, Structure, and Reactivity of the Sterically Crowded Th 3+ Complex (C 5 Me 5 ) 3 Th Including Formation of the Thorium Carbonyl, [(C 5 Me 5 ) 3 Th(CO)][BPh 4 ]
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A Thorium Chalcogenolate Series Generated by Atom Insertion into Thorium–Carbon Bonds
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Bis(permethylindenyl) Complexes of Thorium:  Synthesis, Structure, and Reactivity
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Synthesis of the First Tris(pentamethylcyclopentadienyl) Hydride Complex, (C 5 Me 5 ) 3 ThH
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Thorium Triamidoamine Complexes: Synthesis of an Unusual Dinuclear Tuck-in–Tuck-over Thorium Metallacycle Featuring the Longest Known Thorium−σ-Alkyl Bond
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Solution Structure and Behavior of Dimeric Uranium(III) Metallocene Halides
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A delocalized arene-bridged diuranium single-molecule magnet
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Isolation and characterization of a uranium(VI)–nitride triple bond
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Elucidating bonding preferences in tetrakis(imido)uranate(VI) dianions
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Thorium–phosphorus triamidoamine complexes containing Th–P single- and multiple-bond interactions
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The vitality of uranium molecular chemistry at the dawn of the XXIst century
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Uranium-mediated activation of small molecules
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A Linear, O-Coordinated  1-CO2 Bound to Uranium
journal, September 2004


Molecular Structure of an Unusual Organoactinide Hydride Complex Determined Solely by Neutron Diffraction
journal, January 1979


Probing the Coordinative Unsaturation and Local Environment of Ti 3+  Sites in an Activated High-Yield Ziegler-Natta Catalyst
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In search of tris(trimethylsilylcyclopentadienyl) thorium
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In search of tris(trimethylsilylcyclopentadienyl) thorium
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Isolierung schwer fassbarer Komplexe mit einer Aluminium-Element-Mehrfachbindung: Am Horizont zeichnet sich eine neue Aluminiumchemie ab
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Experimental Realisation of Elusive Multiple-Bonded Aluminium Compounds: A New Horizon in Aluminium Chemistry
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Infrared Spectra of the HAnX and H 2 AnX 2 Molecules (An=Th and U, X=Cl and Br) in Argon Matrices Supported by Electronic Structure Calculations
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Synthesis and Structure of Uranium‐Silylene Complexes
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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.