1
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Najera D, Espinosa Martinez G, Fout AR. Synthesis and Characterization of Palladium Pincer Bis(carbene) CCC Complexes. Organometallics 2023; 42:832-837. [PMID: 38357387 PMCID: PMC10863395 DOI: 10.1021/acs.organomet.3c00114] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Indexed: 02/16/2024]
Abstract
The metalation of the DIPPCCC (DIPPCCC = bis(diisopropylphenyl-imidazol-2-ylidene)phenyl) ligand platform with Pd was achieved under mild conditions by reacting [H3(DIPPCCC)]Cl2 with Pd(OAc)2 at room temperature in the presence of 3.1 equiv of LiN(SiMe3)2. The resulting complexes (DIPPCCC)PdX (X = Cl or Br) were oxidized by two-electron oxidants PhICl2, Br2, and BTMABr3. All the complexes were crystallographically characterized, and analysis of structural parameters around the ligand scaffold show no evidence of a ligand-centered radical, rendering the metal center in the oxidized species, (DIPPCCC)PdX3 (X = Cl or Br), a formal PdIV oxidation state. Unlike their NiIV analogues, these PdIV complexes are stable to air and moisture. The addition of styrene to (DIPPCCC)PdBr3 resulted in the clean reduction of PdIV to PdII, along with the formation of the halogenated alkane. The oxidation to PdIV and subsequent return to PdII upon reduction, as opposed to formation of PdIII species, showcases the accessibility of high-valent palladium DIPPCCC complexes.
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Affiliation(s)
- Daniel
C. Najera
- School
of Chemical Sciences, University of Illinois
at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Gabriel Espinosa Martinez
- School
of Chemical Sciences, University of Illinois
at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Alison R. Fout
- Department
of Chemistry, Texas A&M University, College Station, Texas 77843, United States
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2
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Najera DC, Peñas-Defrutos MN, García-Melchor M, Fout AR. γ-Agostic interactions in ( MesCCC)Fe-Mes(L) complexes. Chem Commun (Camb) 2022; 58:9626-9629. [PMID: 35959650 DOI: 10.1039/d2cc03260k] [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
Agostic interactions were observed in the bound mesityl group in a series of iron compounds bearing a bis(NHC) pincer CCC ligand. The L-type ligand on [(CCC)FeIIMes(L)] complexes influences the strength of the agostic interaction and is manifested in the upfield shift of the 1H NMR resonance for the mesityl methyl resonances. The nature of the interaction was further investigated by density functional theory calculations, allowing rationalization of some unexpected trends and proving to be a powerful predictive tool.
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Affiliation(s)
- Daniel C Najera
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave., Urbana, Illinois 61801, USA.
| | - Marconi N Peñas-Defrutos
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin, College Green, Dublin 2, Ireland. .,Universidad de Valladolid, Valladolid, Spain
| | - Max García-Melchor
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin, College Green, Dublin 2, Ireland.
| | - Alison R Fout
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave., Urbana, Illinois 61801, USA.
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3
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He F, Gourlaouen C, Pang H, Braunstein P. Influence of the Flexibility of Nickel PCP‐Pincer Complexes on C−H and P−C Bond Activation and Ethylene Reactivity: A Combined Experimental and Theoretical Investigation. Chemistry 2022; 28:e202104234. [DOI: 10.1002/chem.202104234] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Indexed: 11/10/2022]
Affiliation(s)
- Fengkai He
- School of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225009 Jiangsu P. R. China
- Laboratoire de Chimie de Coordination Institut de Chimie (UMR 7177 CNRS) Université de Strasbourg 4 rue Blaise Pascal 67081 Strasbourg France
| | - Christophe Gourlaouen
- Laboratoire de Chimie Quantique Institut de Chimie (UMR 7177 CNRS) Université de Strasbourg 4 rue Blaise Pascal 67081 Strasbourg France
| | - Huan Pang
- School of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225009 Jiangsu P. R. China
| | - Pierre Braunstein
- Laboratoire de Chimie de Coordination Institut de Chimie (UMR 7177 CNRS) Université de Strasbourg 4 rue Blaise Pascal 67081 Strasbourg France
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4
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Zhang S, Li H, Appel AM, Hall MB, Bullock RM. Controlling P–C/C–H Bond Cleavage in Nickel Bis(diphosphine) Complexes: Reactivity Scope, Mechanism, and Computations. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00388] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shaoguang Zhang
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999,
K2-12, Richland, Washington 99352, United States
| | - Haixia Li
- Department of Chemistry, Texas A&M University, College Station, Texas 77845, United States
| | - Aaron M. Appel
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999,
K2-12, Richland, Washington 99352, United States
| | - Michael B. Hall
- Department of Chemistry, Texas A&M University, College Station, Texas 77845, United States
| | - R. Morris Bullock
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999,
K2-12, Richland, Washington 99352, United States
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5
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Aloui L, Abidi R, Chetcuti MJ. Synthesis and characterization of nickel-N-heterocyclic carbenes linked to a calix[6]arene platform and their applications in Suzuki-Miyaura cross-coupling catalysis. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119494] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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6
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Dubey P, Singh AK. Sonogashira Coupling (Cu/Amine‐Free) of ArBr/Cl in Aerobic Condition and N
‐
Benzylation of Aniline with Benzyl Alcohol Catalyzed by Complexes of Pd(II) with Sulfated/Selenated NHCs. ChemistrySelect 2020. [DOI: 10.1002/slct.201904819] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Pooja Dubey
- Department of Chemistry, Indian Institute of Technology, Delhi New Delhi 110016 India
| | - Ajai K. Singh
- Department of Chemistry, Indian Institute of Technology, Delhi New Delhi 110016 India
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7
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Berkefeld A, Fröhlich M, Kordan M, Hörner G, Schubert H. Selective metalation of phenol-type proligands for preparative organometallic chemistry. Chem Commun (Camb) 2020; 56:3987-3990. [DOI: 10.1039/d0cc01254h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The selective C-metalation of phenol ester derived proligands is a readily applicable addition to state-of-the-art protocols toward cyclometalated structures, in particular of the base metals.
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Affiliation(s)
- Andreas Berkefeld
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- 72076 Tübingen
- Germany
| | - Markus Fröhlich
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- 72076 Tübingen
- Germany
| | - Mike Kordan
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- 72076 Tübingen
- Germany
| | - Gerald Hörner
- Anorganische Chemie IV
- Universität Bayreuth
- 95440 Bayreuth
- Germany
| | - Hartmut Schubert
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- 72076 Tübingen
- Germany
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8
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Roy P, Bour JR, Kampf JW, Sanford MS. Catalytically Relevant Intermediates in the Ni-Catalyzed C(sp 2)-H and C(sp 3)-H Functionalization of Aminoquinoline Substrates. J Am Chem Soc 2019; 141:17382-17387. [PMID: 31618019 DOI: 10.1021/jacs.9b09109] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This Article describes the synthesis and characterization of cyclometalated aminoquinoline NiII σ-aryl and σ-alkyl complexes that have been proposed as key intermediates in Ni-catalyzed C-H functionalization reactions. These NiII complexes serve as competent catalysts for the C-H functionalization of aminoquinoline derivatives with I2. They also react stoichiometrically with I2 to form either aryl iodides or β-lactams within minutes at room temperature. Furthermore, they react with AgI salts at -30 °C to afford isolable five-coordinate NiIII species. The NiIII σ-aryl complexes proved inert toward C(sp2)-I bond-forming reductive elimination under all conditions examined (up to 140 °C in DMF). In contrast, a NiIII σ-alkyl analogue underwent C(sp3)-N bond-forming reductive elimination at 140 °C in DMF to afford a β-lactam product. However, despite the ability of this latter NiIII species to participate in stoichiometric product formation, the complex was not a competent catalyst for β-lactam formation. Overall, these results suggest against the intermediacy of NiIII species in these C-H functionalization reactions.
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Affiliation(s)
- Pronay Roy
- Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109 , United States
| | - James R Bour
- Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109 , United States
| | - Jeff W Kampf
- Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109 , United States
| | - Melanie S Sanford
- Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109 , United States
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9
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Jackson BJ, Najera DC, Matson EM, Woods TJ, Bertke JA, Fout AR. Synthesis and Characterization of (DIPPCCC)Fe Complexes: A Zwitterionic Metalation Method and CO2 Reactivity. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00271] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Bailey J. Jackson
- School of Chemical Sciences, University of Illinois at Urbana—Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Daniel C. Najera
- School of Chemical Sciences, University of Illinois at Urbana—Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Ellen M. Matson
- School of Chemical Sciences, University of Illinois at Urbana—Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Toby J. Woods
- School of Chemical Sciences, University of Illinois at Urbana—Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Jeffery A. Bertke
- School of Chemical Sciences, University of Illinois at Urbana—Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Alison R. Fout
- School of Chemical Sciences, University of Illinois at Urbana—Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
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10
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Berthel JHJ, Tendera L, Kuntze-Fechner MW, Kuehn L, Radius U. NHC-Stabilized Nickel Olefin, Dialkyl, and Dicyanido Complexes. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900484] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Johannes H. J. Berthel
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Lukas Tendera
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | | | - Laura Kuehn
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Udo Radius
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
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11
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Omer H, Liu P. Computational Study of the Ni-Catalyzed C-H Oxidative Cycloaddition of Aromatic Amides with Alkynes. ACS OMEGA 2019; 4:5209-5220. [PMID: 31459693 PMCID: PMC6648058 DOI: 10.1021/acsomega.9b00030] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Accepted: 02/01/2019] [Indexed: 06/10/2023]
Abstract
The mechanism of Ni-catalyzed ortho C(sp2)-H oxidative cycloaddition of aromatic amides with internal alkynes containing 2-pyridinylmethylamine directing group was investigated using density functional theory (DFT) calculations. The C-H cleavage step proceeds via σ-complex-assisted metathesis (σ-CAM) with an alkenyl-Ni(II) complex. This is in contrast to the more common carboxylate/carbonate-assisted concerted metalation-deprotonation mechanism in related Ni-catalyzed C-H bond functionalization reactions with N,N-bidentate directing groups. In this reaction, the alkyne not only serves as the coupling partner, but also facilitates the σ-CAM C-H metalation both kinetically and thermodynamically. The subsequent functionalization of the five-membered nickelacycle proceeds via alkyne insertion into the Ni-C bond to form a seven-membered nickelacycle. This process proceeds with high levels of regioselectivity to form a C-C bond with sterically more encumbered alkyne terminus. This unusual regioselectivity is due to steric repulsions with the directing group that is coplanar with the alkyne in the migratory insertion transition state. The C-N bond reductive elimination to form the isoquinolone cycloadduct is promoted by PPh3 complexation to the Ni center and the use of flexible 2-pyridinylmethylamine directing group. The origin of the cis-trans isomerism of alkene byproduct was also explained by computations.
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Affiliation(s)
- Humair
M. Omer
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Peng Liu
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Chemical and Petroleum Engineering, University
of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
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12
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Danopoulos AA, Simler T, Braunstein P. N-Heterocyclic Carbene Complexes of Copper, Nickel, and Cobalt. Chem Rev 2019; 119:3730-3961. [PMID: 30843688 DOI: 10.1021/acs.chemrev.8b00505] [Citation(s) in RCA: 263] [Impact Index Per Article: 52.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The emergence of N-heterocyclic carbenes as ligands across the Periodic Table had an impact on various aspects of the coordination, organometallic, and catalytic chemistry of the 3d metals, including Cu, Ni, and Co, both from the fundamental viewpoint but also in applications, including catalysis, photophysics, bioorganometallic chemistry, materials, etc. In this review, the emergence, development, and state of the art in these three areas are described in detail.
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Affiliation(s)
- Andreas A Danopoulos
- Laboratory of Inorganic Chemistry , National and Kapodistrian University of Athens , Panepistimiopolis Zografou , Athens GR 15771 , Greece.,Université de Strasbourg, CNRS, Institut de Chimie UMR 7177 , Laboratoire de Chimie de Coordination , Strasbourg 67081 Cedex , France
| | - Thomas Simler
- Université de Strasbourg, CNRS, Institut de Chimie UMR 7177 , Laboratoire de Chimie de Coordination , Strasbourg 67081 Cedex , France
| | - Pierre Braunstein
- Université de Strasbourg, CNRS, Institut de Chimie UMR 7177 , Laboratoire de Chimie de Coordination , Strasbourg 67081 Cedex , France
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13
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Zhang A, Wang C, Lai X, Zhai X, Pang M, Tung CH, Wang W. Reactivity of the diphosphinodithio ligated nickel(0) complex toward alkyl halides and resultant nickel(i) and nickel(ii)-alkyl complexes. Dalton Trans 2018; 47:15757-15764. [PMID: 30351329 DOI: 10.1039/c8dt03188f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Diphosphinodithio ligated complexes of nickel(0), nickel(i) and nickel(ii)-alkyl with a reactivity relevant to the C-C bond formation were described. Stoichiometric reactions of the nickel(0) complex, [(P2S2)Ni] ([1]0, P2S2 = (Ph2PC6H4CH2S)2(C2H4)), with alkyl halides (RX) such as C6H5CH2Br, C2H3CH2Br, C2H5I and (CH3)2CHI were investigated, from which the products were found to be highly dependent on the nature of RX used. Oxidative addition of C2H3CH2Br to [1]0 provides the stable Ni(ii)-alkyl complexes [1-allyl]+. The reaction of [1]0 with C6H5CH2Br proceeds through a radical pathway resulting in the formation of the nickel(i) complex [1]+ and an organic homo-coupled product 1,2-diphenylethane. Oxidative addition of C2H5I or (CH3)2CHI to [1]0 can be achieved but it competes with the halogen atom abstraction reaction as found for C6H5CH2Br. [1]0 was shown to be an active catalyst for the coupling reactions of primary halides and alkyl Grignard reagents.
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Affiliation(s)
- Ailing Zhang
- Key Lab for Colloid and Interface Chemistry of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China.
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14
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Denny JA, Lamb RW, Reilly SW, Donnadieu B, Webster CE, Hollis TK. Investigation of metallation/transmetallation reactions to synthesize a series of CCC–NHC Co pincer complexes and their X-ray structures. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.05.040] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Yan J, Wang YB, Zhu ZH, Li Y, Zhu X, Hao XQ, Song MP. Synthesis, Characterization, and Catalytic Studies of Unsymmetrical Chiral NCC Pincer Pd(II) and Ni(II) Complexes Bearing (Imidazolinyl)aryl NHC Ligands. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00300] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Jing Yan
- College of Chemistry and Molecular Engineering, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, People’s Republic of China
| | - Yan-Bing Wang
- College of Chemistry and Molecular Engineering, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, People’s Republic of China
| | - Zhi-Hui Zhu
- College of Chemistry and Molecular Engineering, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, People’s Republic of China
| | - Yigao Li
- College of Chemistry and Molecular Engineering, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, People’s Republic of China
| | - Xinju Zhu
- College of Chemistry and Molecular Engineering, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, People’s Republic of China
| | - Xin-Qi Hao
- College of Chemistry and Molecular Engineering, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, People’s Republic of China
| | - Mao-Ping Song
- College of Chemistry and Molecular Engineering, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, People’s Republic of China
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16
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Gu S, Du J, Huang J, Guo Y, Yang L, Xu W, Chen W. Unsymmetrical NCN-pincer mononuclear and dinuclear nickel(ii) complexes of N-heterocyclic carbene (NHC): synthesis, structure and catalysis for Suzuki-Miyaura cross-coupling. Dalton Trans 2018; 46:586-594. [PMID: 27990545 DOI: 10.1039/c6dt03944h] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This report describes the synthesis and characterization of a family of unsymmetrical NCN pincer Ni(ii) complexes 2-8 with NHC-triazole arms. All of these complexes have been fully characterized by X-ray single crystal analysis, NMR spectroscopy, and elemental analysis. Complexes 2 and 4-6 were square planar with a chloride trans to the carbene carbon atoms. Complex 3 was a paramagnetic octahedral complex with its central metal surrounded by two NCN pincer ligands. Complexes 7 and 8 contain [(NHC)2Ni2-OH] moieties bearing a OH bridge. Both the [(NHC)2Ni2-OH] complexes 7 and 8 and [(NCNHCN)Ni-Cl] complexes 2 and 4-6 were synthesized similarly via the reactions of the in situ formed Ag-NHCs from the corresponding imidazolium salts with [NiCl2(PPh3)2]. The catalytic activities of all complexes for Suzuki-Miyaura cross-coupling were examined. Under the optimized conditions, complex 4 was active in the Suzuki-Miyaura cross-coupling reactions of aryl iodides and aryl bromides at 110 °C. Aryl chlorides were successfully coupled in the presence of triphenylphosphine as an additive.
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Affiliation(s)
- Shaojin Gu
- School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, People's Republic of China.
| | - Jiehao Du
- School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, People's Republic of China.
| | - Jingjing Huang
- School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, People's Republic of China.
| | - Yun Guo
- School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, People's Republic of China.
| | - Ling Yang
- School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, People's Republic of China.
| | - Weilin Xu
- School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, People's Republic of China.
| | - Wanzhi Chen
- Department of Chemistry, Zhejiang University, Hangzhou, 310028, People's Republic of China.
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17
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Free methylidyne? CCC-NHC tantalum bis(imido) reactivity: protonation, rearrangement to a mixed unsymmetrical CCC-N-heterocyclic carbene/N-heterocyclic dicarbene (CCC-NHC/NHDC) pincer tantalum bis(imido) complex. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.08.050] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Quezada-Miriel M, Ochoa-Sanfelice JR, Mendoza-Tellez S, Martinez-Otero D, Asay M. Metalation behavior of a bis-saturated NHC ligand with a flexible m-xylyl linker. Dalton Trans 2018; 47:17382-17391. [DOI: 10.1039/c8dt04181d] [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
The final bis saturated N-heterocyclic carbene pincer proligand has been synthesized but refuses attempts at C–H activation.
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Affiliation(s)
- Magdalena Quezada-Miriel
- Instituto de Quimica
- Universidad Nacional Autonoma de Mexico
- Circuito Exterior S/N
- Cuidad Universitaria
- Coyoacan
| | - J. Rubén Ochoa-Sanfelice
- Instituto de Quimica
- Universidad Nacional Autonoma de Mexico
- Circuito Exterior S/N
- Cuidad Universitaria
- Coyoacan
| | - Sebastian Mendoza-Tellez
- Instituto de Quimica
- Universidad Nacional Autonoma de Mexico
- Circuito Exterior S/N
- Cuidad Universitaria
- Coyoacan
| | - Diego Martinez-Otero
- Laboratorio de Rayos X
- Centro Conjunto de Investigación en Química Sustentable
- UAEM-UNAM
- Toluca
- Mexico
| | - Matthew Asay
- Instituto de Quimica
- Universidad Nacional Autonoma de Mexico
- Circuito Exterior S/N
- Cuidad Universitaria
- Coyoacan
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19
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Brazeau A, Yuan K, Ko SB, Wyman I, Wang S. Anion Sensing with a Blue Fluorescent Triarylboron-Functionalized Bisbenzimidazole and Its Bisbenzimidazolium Salt. ACS OMEGA 2017; 2:8625-8632. [PMID: 31457395 PMCID: PMC6645667 DOI: 10.1021/acsomega.7b01631] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Accepted: 11/22/2017] [Indexed: 05/04/2023]
Abstract
A blue fluorescent p-dimesitylboryl-phenyl-functionalized 1,3-bisbenzimidazolyl benzene molecule (1) has been synthesized in high yield by Stille coupling of bisbenzimidazolyl bromobenzene with p-BMes2-SnBu3-benzene. Methylation of 1 led to the formation of the bisbenzimidazolium salt (2). The utility of both 1 and 2 in sensing CN- and halide (F-, Cl-, Br-, and I-) was examined, and it was found that only the small fluoride and cyanide anions were able to bind to the boron atom with binding constants in the range of 2.9 × 104 to 5 × 105 M-1. Computational studies provided insight into the photophysical properties of the molecules and verified that a charge-transfer process is quenched in these "turn-off" molecular sensors.
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20
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Luo S, Siegler MA, Bouwman E. Dinuclear Nickel Complexes of Thiolate-Functionalized Carbene Ligands and Their Electrochemical Properties. Organometallics 2017; 37:740-747. [PMID: 29551851 PMCID: PMC5850092 DOI: 10.1021/acs.organomet.7b00576] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Indexed: 02/04/2023]
Abstract
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Four
dimeric nickel(II) complexes [Ni2Cl2(BnC2S)2] [1], [Ni2Cl2(BnC3S)2] [2], [Ni2(PyC2S)2]Br2 [3]Br2, and [Ni2(PyC3S)2]Br2 [4]Br2 of four different
thiolate-functionalized N-heterocyclic carbene (NHC) ligands were
synthesized, and their structures have been determined by single-crystal
X-ray crystallography. The four ligands differ by the alkyl chain
length between the thiolate group and the benzimidazole nitrogen (two
−C2– or three −C3–
carbon atoms) and the second functionality at the NHC being a benzyl
(Bn) or a pyridylmethyl (Py) group. The nickel(II) ions are coordinated
to the NHC carbon atom and the pendent thiolate group, which bridges
to the second nickel(II) ion creating the dinuclear structure. Additionally,
in compounds [1] and [2], the fourth coordination
position of the square-planar Ni(II) centers is occupied by the halide
ions, whereas in [3]2+ and [4]2+, the additional pendant pyridylmethyl groups complete
the coordination spheres of the nickel ions. The electrochemical properties
of the four complexes were studied using cyclic voltammetry and controlled-potential
coulometry methods. The thiolate-functionalized carbene complexes
[1] and [2] appear to be poor electrocatalysts
for the hydrogen evolution reaction; the complexes [3]Br2 and [4]Br2, bearing an extra
pyridylmethyl group, show higher catalytic activity in proton reduction,
indicating that the pyridine group plays an important role in the
catalytic cycle.
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Affiliation(s)
- Siyuan Luo
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Maxime A Siegler
- Department of Chemistry, Johns Hopkins University, 3400 N. Charles Street, Baltimore, Maryland 21218, United States
| | - Elisabeth Bouwman
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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21
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Cope JD, Denny JA, Lamb RW, McNamara LE, Hammer NI, Webster CE, Hollis TK. Synthesis, characterization, photophysics, and a ligand rearrangement of CCC-NHC pincer nickel complexes: Colors, polymorphs, emission, and Raman spectra. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.05.046] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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22
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Obata A, Ano Y, Chatani N. Nickel-catalyzed C-H/N-H annulation of aromatic amides with alkynes in the absence of a specific chelation system. Chem Sci 2017; 8:6650-6655. [PMID: 28989692 PMCID: PMC5625264 DOI: 10.1039/c7sc01750b] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 07/24/2017] [Indexed: 11/21/2022] Open
Abstract
The Ni-catalyzed reaction of aromatic amides with alkynes in the presence of KOBu t involves C-H/N-H oxidative annulation to give 1(2H)-isoquinolinones. A key to the success of the reaction is the use of a catalytic amount of strong base, such as KOBu t . The reaction shows a high functional group compatibility. The reaction with unsymmetrical alkynes, such as 1-arylalkynes, gives the corresponding 1(2H)-isoquinolinones with a high level of regioselectivity. This discovery would lead to the development of Ni-catalyzed chelation-assisted C-H functionalization reactions without the need for a specific chelation system.
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Affiliation(s)
- Atsushi Obata
- Department of Applied Chemistry , Faculty of Engineering , Osaka University , Suita , Osaka 565-0871 , Japan
| | - Yusuke Ano
- Department of Applied Chemistry , Faculty of Engineering , Osaka University , Suita , Osaka 565-0871 , Japan
| | - Naoto Chatani
- Department of Applied Chemistry , Faculty of Engineering , Osaka University , Suita , Osaka 565-0871 , Japan
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23
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Charra V, de Frémont P, Braunstein P. Multidentate N-heterocyclic carbene complexes of the 3d metals: Synthesis, structure, reactivity and catalysis. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.03.007] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Chong E, Kampf JW, Ariafard A, Canty AJ, Sanford MS. Oxidatively Induced C-H Activation at High Valent Nickel. J Am Chem Soc 2017; 139:6058-6061. [PMID: 28425702 DOI: 10.1021/jacs.7b02387] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This communication describes a series of oxidatively induced intramolecular arene C-H activation reactions of NiII model complexes to yield NiIV σ-aryl products. These reactions proceed within 10 min at room temperature, which represents among the mildest conditions reported for C-H cleavage at a Ni center. A combination of density functional theory and preliminary experimental mechanistic studies implicate a pathway involving initial 2e- oxidation of the NiII starting materials by the F+ transfer reagent N-fluoro-2,4,6-trimethylpyridinium triflate followed by triflate-assisted C-H cleavage at NiIV to yield the products.
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Affiliation(s)
- Eugene Chong
- Department of Chemistry, University of Michigan , 930 N. University Avenue, Ann Arbor, Michigan 48109, United States
| | - Jeff W Kampf
- Department of Chemistry, University of Michigan , 930 N. University Avenue, Ann Arbor, Michigan 48109, United States
| | - Alireza Ariafard
- School of Physical Sciences, University of Tasmania , Hobart, Tasmania 7001, Australia
| | - Allan J Canty
- School of Physical Sciences, University of Tasmania , Hobart, Tasmania 7001, Australia
| | - Melanie S Sanford
- Department of Chemistry, University of Michigan , 930 N. University Avenue, Ann Arbor, Michigan 48109, United States
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25
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Esteruelas MA, López AM, Oñate E, San-Torcuato A, Tsai JY, Xia C. Formation of Dinuclear Iridium Complexes by NHC-Supported C–H Bond Activation. Organometallics 2017. [DOI: 10.1021/acs.organomet.6b00891] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Miguel A. Esteruelas
- Departamento
de Química Inorgánica, Instituto de Síntesis
Química y Catálisis Homogénea (ISQCH), Centro
de Innovación en Química Avanzada (ORFEO−CINQA), Universidad de Zaragoza - CSIC, 50009 Zaragoza, Spain
| | - Ana M. López
- Departamento
de Química Inorgánica, Instituto de Síntesis
Química y Catálisis Homogénea (ISQCH), Centro
de Innovación en Química Avanzada (ORFEO−CINQA), Universidad de Zaragoza - CSIC, 50009 Zaragoza, Spain
| | - Enrique Oñate
- Departamento
de Química Inorgánica, Instituto de Síntesis
Química y Catálisis Homogénea (ISQCH), Centro
de Innovación en Química Avanzada (ORFEO−CINQA), Universidad de Zaragoza - CSIC, 50009 Zaragoza, Spain
| | - Ainhoa San-Torcuato
- Departamento
de Química Inorgánica, Instituto de Síntesis
Química y Catálisis Homogénea (ISQCH), Centro
de Innovación en Química Avanzada (ORFEO−CINQA), Universidad de Zaragoza - CSIC, 50009 Zaragoza, Spain
| | - Jui-Yi Tsai
- Universal Display Corporation, 375 Phillips Boulevard, Ewing, New Jersey 08618, United States
| | - Chuanjun Xia
- Universal Display Corporation, 375 Phillips Boulevard, Ewing, New Jersey 08618, United States
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26
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Cope JD, Liyanage NP, Kelley PJ, Denny JA, Valente EJ, Webster CE, Delcamp JH, Hollis TK. Electrocatalytic reduction of CO2 with CCC-NHC pincer nickel complexes. Chem Commun (Camb) 2017; 53:9442-9445. [DOI: 10.1039/c6cc06537f] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
CCC-NHC pincer Ni complexes electrocatalytically reduce CO2 to CO and formate at the first reduction potential without producing or requiring molecular H2.
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Affiliation(s)
- James D. Cope
- Department of Chemistry and the Center for Computational Sciences
- Mississippi State University
- Mississippi State
- USA
| | - Nalaka P. Liyanage
- Department of Chemistry and Biochemistry
- The University of Mississippi
- University
- USA
| | - Paul J. Kelley
- Department of Chemistry and Biochemistry
- The University of Mississippi
- University
- USA
| | - Jason A. Denny
- Department of Chemistry and the Center for Computational Sciences
- Mississippi State University
- Mississippi State
- USA
| | - Edward J. Valente
- University of Portland Diffraction Facility
- 112A Swindells Hall
- Department of Chemistry
- University of Portland
- Portland
| | - Charles Edwin Webster
- Department of Chemistry and the Center for Computational Sciences
- Mississippi State University
- Mississippi State
- USA
| | - Jared H. Delcamp
- Department of Chemistry and Biochemistry
- The University of Mississippi
- University
- USA
| | - T. Keith Hollis
- Department of Chemistry and the Center for Computational Sciences
- Mississippi State University
- Mississippi State
- USA
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27
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Liu M, Namyslo JC, Nieger M, Polamo M, Schmidt A. From betaines to anionic N-heterocyclic carbenes. Borane, gold, rhodium, and nickel complexes starting from an imidazoliumphenolate and its carbene tautomer. Beilstein J Org Chem 2016; 12:2673-2681. [PMID: 28144338 PMCID: PMC5238575 DOI: 10.3762/bjoc.12.264] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Accepted: 11/23/2016] [Indexed: 11/23/2022] Open
Abstract
The mesomeric betaine imidazolium-1-ylphenolate forms a borane adduct with tris(pentafluorophenyl)borane by coordination with the phenolate oxygen, whereas its NHC tautomer 1-(2-phenol)imidazol-2-ylidene reacts with (triphenylphosphine)gold(I) chloride to give the cationic NHC complex [Au(NHC)2][Cl] by coordination with the carbene carbon atom. The anionic N-heterocyclic carbene 1-(2-phenolate)imidazol-2-ylidene gives the complexes [K][Au(NHC-)2], [Rh(NHC-)3] and [Ni(NHC-)2], respectively. Results of four single crystal analyses are presented.
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Affiliation(s)
- Ming Liu
- Clausthal University of Technology, Institute of Organic Chemistry, Leibnizstrasse 6, D-38678 Clausthal-Zellerfeld, Germany
| | - Jan C Namyslo
- Clausthal University of Technology, Institute of Organic Chemistry, Leibnizstrasse 6, D-38678 Clausthal-Zellerfeld, Germany
| | - Martin Nieger
- University of Helsinki, Department of Chemistry, P.O. Box 55, FIN-00014 Helsinki, Finland
| | - Mika Polamo
- University of Helsinki, Department of Chemistry, P.O. Box 55, FIN-00014 Helsinki, Finland
| | - Andreas Schmidt
- Clausthal University of Technology, Institute of Organic Chemistry, Leibnizstrasse 6, D-38678 Clausthal-Zellerfeld, Germany
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28
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New platinum(II) complexes of CCC-pincer N-heterocyclic carbene ligand: Synthesis, characterization, cytotoxicity and antileishmanial activity. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.06.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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29
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Affiliation(s)
- Nathan A. Eberhardt
- Department
of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, United States
| | - Hairong Guan
- Department
of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, United States
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30
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Brazzolotto D, Gennari M, Queyriaux N, Simmons TR, Pécaut J, Demeshko S, Meyer F, Orio M, Artero V, Duboc C. Nickel-centred proton reduction catalysis in a model of [NiFe] hydrogenase. Nat Chem 2016; 8:1054-1060. [PMID: 27768098 DOI: 10.1038/nchem.2575] [Citation(s) in RCA: 156] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 06/13/2016] [Indexed: 02/07/2023]
Abstract
Hydrogen production through water splitting is one of the most promising solutions for the storage of renewable energy. [NiFe] hydrogenases are organometallic enzymes containing nickel and iron centres that catalyse hydrogen evolution with performances that rival those of platinum. These enzymes provide inspiration for the design of new molecular catalysts that do not require precious metals. However, all heterodinuclear NiFe models reported so far do not reproduce the Ni-centred reactivity found at the active site of [NiFe] hydrogenases. Here, we report a structural and functional NiFe mimic that displays reactivity at the Ni site. This is shown by the detection of two catalytic intermediates that reproduce structural and electronic features of the Ni-L and Ni-R states of the enzyme during catalytic turnover. Under electrocatalytic conditions, this mimic displays high rates for H2 evolution (second-order rate constant of 2.5 × 104 M-1 s-1; turnover frequency of 250 s-1 at 10 mM H+ concentration) from mildly acidic solutions.
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Affiliation(s)
- Deborah Brazzolotto
- Univ. Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France.,Univ. Grenoble Alpes, CNRS UMR 5249, CEA, Laboratoire de Chimie et Biologie des Métaux, F-38000 Grenoble, France
| | - Marcello Gennari
- Univ. Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France
| | - Nicolas Queyriaux
- Univ. Grenoble Alpes, CNRS UMR 5249, CEA, Laboratoire de Chimie et Biologie des Métaux, F-38000 Grenoble, France
| | - Trevor R Simmons
- Univ. Grenoble Alpes, CNRS UMR 5249, CEA, Laboratoire de Chimie et Biologie des Métaux, F-38000 Grenoble, France
| | - Jacques Pécaut
- Univ. Grenoble Alpes, INAC-LCIB, F-38000 Grenoble, France.,CEA, DRF-INAC-SyMMES, Reconnaissance Ionique et Chimie de Coordination, F-38000 Grenoble, France
| | - Serhiy Demeshko
- Institute of Inorganic Chemistry, Georg-August-University Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Franc Meyer
- Institute of Inorganic Chemistry, Georg-August-University Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany.,International Center for Advanced Studies of Energy Conversion (ICASEC), Georg-August-University, D-37077 Göttingen, Germany
| | - Maylis Orio
- Institut des Sciences Moléculaires de Marseille, Aix Marseille Université, CNRS, Centrale Marseille, ISM2 UMR 7313, 13397, Marseille, France
| | - Vincent Artero
- Univ. Grenoble Alpes, CNRS UMR 5249, CEA, Laboratoire de Chimie et Biologie des Métaux, F-38000 Grenoble, France
| | - Carole Duboc
- Univ. Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France
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31
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Zhang S, Li H, Appel AM, Hall MB, Bullock RM. Facile P−C/C−H Bond‐Cleavage Reactivity of Nickel Bis(diphosphine) Complexes. Chemistry 2016; 22:9493-7. [DOI: 10.1002/chem.201601469] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Shaoguang Zhang
- Pacific Northwest National Laboratory P.O. Box 999, K2-12 Richland WA 99352 USA
| | - Haixia Li
- Department of Chemistry Texas A&M University College Station TX 77845 USA
| | - Aaron M. Appel
- Pacific Northwest National Laboratory P.O. Box 999, K2-12 Richland WA 99352 USA
| | - Michael B. Hall
- Department of Chemistry Texas A&M University College Station TX 77845 USA
| | - R. Morris Bullock
- Pacific Northwest National Laboratory P.O. Box 999, K2-12 Richland WA 99352 USA
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32
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Andrew RE, González-Sebastián L, Chaplin AB. NHC-based pincer ligands: carbenes with a bite. Dalton Trans 2016; 45:1299-305. [PMID: 26673868 DOI: 10.1039/c5dt04429d] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In this frontier article we overview the emergence and scope of NHC-based CCC and CNC pincer systems, i.e. complexes containing mer-tridentate ligands bearing two NHC donor groups, comment on their effectiveness in applications, and highlight areas for future development and exploitation.
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Affiliation(s)
- Rhiann E Andrew
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK.
| | | | - Adrian B Chaplin
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK.
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33
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Ito JI, Sugino K, Matsushima S, Sakaguchi H, Iwata H, Ishihara T, Nishiyama H. Synthesis of NHC-Oxazoline Pincer Complexes of Rh and Ru and Their Catalytic Activity for Hydrogenation and Conjugate Reduction. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00239] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jun-ichi Ito
- Department of Applied Chemistry,
Graduate School of Engineering, Nagoya University, Chikusaku, Nagoya 464-8603, Japan
| | - Kanae Sugino
- Department of Applied Chemistry,
Graduate School of Engineering, Nagoya University, Chikusaku, Nagoya 464-8603, Japan
| | - Satoru Matsushima
- Department of Applied Chemistry,
Graduate School of Engineering, Nagoya University, Chikusaku, Nagoya 464-8603, Japan
| | - Hiroki Sakaguchi
- Department of Applied Chemistry,
Graduate School of Engineering, Nagoya University, Chikusaku, Nagoya 464-8603, Japan
| | - Hiroshi Iwata
- Department of Applied Chemistry,
Graduate School of Engineering, Nagoya University, Chikusaku, Nagoya 464-8603, Japan
| | - Takahiro Ishihara
- Department of Applied Chemistry,
Graduate School of Engineering, Nagoya University, Chikusaku, Nagoya 464-8603, Japan
| | - Hisao Nishiyama
- Department of Applied Chemistry,
Graduate School of Engineering, Nagoya University, Chikusaku, Nagoya 464-8603, Japan
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34
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Martinez GE, Ocampo C, Park YJ, Fout AR. Accessing Pincer Bis(carbene) Ni(IV) Complexes from Ni(II) via Halogen and Halogen Surrogates. J Am Chem Soc 2016; 138:4290-3. [PMID: 27014933 DOI: 10.1021/jacs.5b12827] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This communication describes the two-electron oxidation of ((DIPP)CCC)NiX ((DIPP)CCC = bis(diisopropylphenyl-benzimidazol-2-ylidene)phenyl); X = Cl or Br) with halogen and halogen surrogates to form ((DIPP)CCC)NiX3. These complexes represent a rare oxidation state of nickel, as well as an unprecedented reaction pathway to access these species through Br2 and halogen surrogate (benzyltrimethylammonium tribromide). The Ni(IV) complexes have been characterized by a suite of spectroscopic techniques and can readily reduce to the Ni(II) counterpart, allowing for cycling between the Ni(II)/Ni(IV) oxidation states.
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Affiliation(s)
- Gabriel Espinosa Martinez
- School of Chemical Sciences, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Cristian Ocampo
- School of Chemical Sciences, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Yun Ji Park
- School of Chemical Sciences, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Alison R Fout
- School of Chemical Sciences, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States
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35
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Campos J, López-Serrano J, Peloso R, Carmona E. Methyl Complexes of the Transition Metals. Chemistry 2016; 22:6432-57. [PMID: 26991740 DOI: 10.1002/chem.201504483] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Indexed: 01/11/2023]
Abstract
Organometallic chemistry can be considered as a wide area of knowledge that combines concepts of classic organic chemistry, that is, based essentially on carbon, with molecular inorganic chemistry, especially with coordination compounds. Transition-metal methyl complexes probably represent the simplest and most fundamental way to view how these two major areas of chemistry combine and merge into novel species with intriguing features in terms of reactivity, structure, and bonding. Citing more than 500 bibliographic references, this review aims to offer a concise view of recent advances in the field of transition-metal complexes containing M-CH3 fragments. Taking into account the impressive amount of data that are continuously provided by organometallic chemists in this area, this review is mainly focused on results of the last five years. After a panoramic overview on M-CH3 compounds of Groups 3 to 11, which includes the most recent landmark findings in this area, two further sections are dedicated to methyl-bridged complexes and reactivity.
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Affiliation(s)
- Jesús Campos
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK
| | - Joaquín López-Serrano
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química, Avanzada (ORFEO-CINQA), Universidad de Sevilla and Consejo Superior de Investigaciones Cientificas (CSIC), Avenida Américo Vespucio 49, 41092, Sevilla, Spain
| | - Riccardo Peloso
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química, Avanzada (ORFEO-CINQA), Universidad de Sevilla and Consejo Superior de Investigaciones Cientificas (CSIC), Avenida Américo Vespucio 49, 41092, Sevilla, Spain
| | - Ernesto Carmona
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química, Avanzada (ORFEO-CINQA), Universidad de Sevilla and Consejo Superior de Investigaciones Cientificas (CSIC), Avenida Américo Vespucio 49, 41092, Sevilla, Spain.
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36
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Reilly SW, Webster CE, Hollis TK, Valle HU. Transmetallation from CCC-NHC pincer Zr complexes in the synthesis of air-stable CCC-NHC pincer Co(iii) complexes and initial hydroboration trials. Dalton Trans 2016; 45:2823-8. [PMID: 26814468 DOI: 10.1039/c5dt04752h] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Development of CCC-NHC pincer Co complexes via transmetalation from Zr is reported. Formation of these air-stable Co(iii) complexes was achieved through use of a CoCl2 or Co(acac)3in situ or with a discrete CCC-NHC pincer Zr transmetallating agent. Preliminary activity in the hydroboration of styrene is reported. This facile methodology will further the development of CCC-NHC pincer first-row transition metal complexes.
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Affiliation(s)
- Sean W Reilly
- Department of Chemistry, Mississippi State University, Mississippi State, MS 39762-9573, USA.
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37
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Ibrahim AD, Tokmic K, Brennan MR, Kim D, Matson EM, Nilges MJ, Bertke JA, Fout AR. Monoanionic bis(carbene) pincer complexes featuring cobalt(I–III) oxidation states. Dalton Trans 2016; 45:9805-11. [DOI: 10.1039/c5dt04723d] [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
The synthesis and characterization of a series of cobalt complexes featuring a pincer bis(carbene) ligand of the meta-phenylene-bridged bis-N-heterocyclic carbene (ArCCC, Ar = 2,6-diispropylphenyl or mesityl) are reported.
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Affiliation(s)
| | - Kenan Tokmic
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
| | - Marshall R. Brennan
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
| | - Dongyoung Kim
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
| | - Ellen M. Matson
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
| | - Mark J. Nilges
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
| | - Jeffery A. Bertke
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
| | - Alison R. Fout
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana
- USA
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38
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Yang C, Wu WD, Zhao L, Wang MX. Macrocyclic Aryl–Nickel(II) Complexes: Synthesis, Structure, and Reactivity Studies. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00733] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chi Yang
- The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People’s Republic of China
| | - Wen-Di Wu
- The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People’s Republic of China
| | - Liang Zhao
- The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People’s Republic of China
| | - Mei-Xiang Wang
- The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People’s Republic of China
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