Insertion, protonolysis and photolysis reactivity of a thorium monoalkyl amidinate complex
Abstract
The reactivity of the thorium monoalkyl complex Th(CH2SiMe3)(BIMA)3[1, BIMA = MeC(NiPr)2] with various small molecules is described. While steric congestion prohibits the insertion of N,N'-diisopropylcarbodiimide into the Th-C bond in 1, the first thorium tetrakis(amidinate) complex, Th(BIMA)4 (2), is synthesized via an alternative salt metathesis route. Insertion of p-tolyl azide leads to the triazenido complex Th[(p-tolyl)NNN(CH2SiMe3)-κ2 N1,2] (BIMA)3(3), which then undergoes thermal decomposition to the amido species Th[(p-tolyl)N(SiMe3)](BIMA)3 (4). The reaction of 1 with 2,6-dimethylphenylisocyanide results in the thorium iminoacyl complex Th[η2-(CN)-2,6-Me2-C6H3(CH2SiMe3)](BIMA)3 (5), while the reaction with isoelectronic CO leads to the products Th[OC(CH2)SiMe3](BIMA)3 (6) and Th[OC(NiPr)C(CH2SiMe3)(C(Me)N(iPr))O-κ2O,O'](BIMA)2 (7), the latter being the result of CO coupling and insertion into an amidinate ligand. Protonolysis is achieved with several substrates, producing amido (9), aryloxide (10), phosphido (11a,b), acetylide (12), and cationic (13) complexes. Ligand exchange with 9-borabicyclo[3.3.1]nonane (9-BBN) results in formation of the thorium borohydride complex (BIMA)3Th(μ-H)2[B(C8H14)] (14). Complex 1 also reacts under photolytic conditions to eliminate SiMe4 and produce Th(BIMA)2(BIMA*) [15, BIMA* = (iPr)NC(CH2)N(iPr)], featuring a rare example of a dianionic amidinate ligand. Complexes 2, 3, 5, 6, 11a, and 12-15 were characterized by 1H and 13C{1H} NMR spectroscopy, FTIR, EA, melting point and X-ray crystallography. All other complexes were identifiedmore »
- Authors:
-
[1];
[1]
- Department of Chemistry, University of California, Berkeley, USA, Chemical Sciences Division
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
- OSTI Identifier:
- 1421572
- Alternate Identifier(s):
- OSTI ID: 1465421
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Published Article
- Journal Name:
- Chemical Science
- Additional Journal Information:
- Journal Name: Chemical Science Journal Volume: 9 Journal Issue: 10; 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
Settineri, Nicholas S., and Arnold, John. Insertion, protonolysis and photolysis reactivity of a thorium monoalkyl amidinate complex. United Kingdom: N. p., 2018.
Web. doi:10.1039/C7SC05328B.
Settineri, Nicholas S., & Arnold, John. Insertion, protonolysis and photolysis reactivity of a thorium monoalkyl amidinate complex. United Kingdom. https://doi.org/10.1039/C7SC05328B
Settineri, Nicholas S., and Arnold, John. Mon .
"Insertion, protonolysis and photolysis reactivity of a thorium monoalkyl amidinate complex". United Kingdom. https://doi.org/10.1039/C7SC05328B.
@article{osti_1421572,
title = {Insertion, protonolysis and photolysis reactivity of a thorium monoalkyl amidinate complex},
author = {Settineri, Nicholas S. and Arnold, John},
abstractNote = {The reactivity of the thorium monoalkyl complex Th(CH2SiMe3)(BIMA)3[1, BIMA = MeC(NiPr)2] with various small molecules is described. While steric congestion prohibits the insertion of N,N'-diisopropylcarbodiimide into the Th-C bond in 1, the first thorium tetrakis(amidinate) complex, Th(BIMA)4 (2), is synthesized via an alternative salt metathesis route. Insertion of p-tolyl azide leads to the triazenido complex Th[(p-tolyl)NNN(CH2SiMe3)-κ2 N1,2] (BIMA)3(3), which then undergoes thermal decomposition to the amido species Th[(p-tolyl)N(SiMe3)](BIMA)3 (4). The reaction of 1 with 2,6-dimethylphenylisocyanide results in the thorium iminoacyl complex Th[η2-(CN)-2,6-Me2-C6H3(CH2SiMe3)](BIMA)3 (5), while the reaction with isoelectronic CO leads to the products Th[OC(CH2)SiMe3](BIMA)3 (6) and Th[OC(NiPr)C(CH2SiMe3)(C(Me)N(iPr))O-κ2O,O'](BIMA)2 (7), the latter being the result of CO coupling and insertion into an amidinate ligand. Protonolysis is achieved with several substrates, producing amido (9), aryloxide (10), phosphido (11a,b), acetylide (12), and cationic (13) complexes. Ligand exchange with 9-borabicyclo[3.3.1]nonane (9-BBN) results in formation of the thorium borohydride complex (BIMA)3Th(μ-H)2[B(C8H14)] (14). Complex 1 also reacts under photolytic conditions to eliminate SiMe4 and produce Th(BIMA)2(BIMA*) [15, BIMA* = (iPr)NC(CH2)N(iPr)], featuring a rare example of a dianionic amidinate ligand. Complexes 2, 3, 5, 6, 11a, and 12-15 were characterized by 1H and 13C{1H} NMR spectroscopy, FTIR, EA, melting point and X-ray crystallography. All other complexes were identified by one or more of these spectroscopic techniques.A tris-amidinate thorium monoalkyl complex facilitates new small molecule reactivity and eliminates SiMe4 under photolytic conditions to generate a mixed amidinate dimer.},
doi = {10.1039/C7SC05328B},
journal = {Chemical Science},
number = 10,
volume = 9,
place = {United Kingdom},
year = {Mon Jan 01 00:00:00 EST 2018},
month = {Mon Jan 01 00:00:00 EST 2018}
}
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Fig. 1: Molecular structure of 2 (thermal ellipsoids drawn at the 50% probability level). Hydrogen atoms omitted for clarity.
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Synthesis and Reactivity of a Silylalkyl Double Tuck-in Uranium Metallocene [(η 5 :η 1 -C 5 Me 4 SiMe 2 CH 2 ) 2 U] and its Conversion to Bis(tethered) Metallocenes
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Convenient access to the anhydrous thorium tetrachloride complexes ThCl4(DME)2, ThCl4(1,4-dioxane)2 and ThCl4(THF)3.5 using commercially available and inexpensive starting materials
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The role of 5f-orbital participation in unexpected inversion of the σ-bond metathesis reactivity trend of triamidoamine thorium( iv ) and uranium( iv ) alkyls
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Thorium(IV) and Uranium(IV) Ketimide Complexes Prepared by Nitrile Insertion into Actinide−Alkyl and −Aryl Bonds
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