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Rahman MM, Zhao Q, Meng G, Szostak R, Szostak M. [Ni(Np#)(η5-Cp)Cl]: Flexible, Sterically Bulky, Well-Defined, Highly Reactive Complex for Nickel-Catalyzed Cross-Coupling. Organometallics 2022; 41:2597-2604. [PMID: 38031540 PMCID: PMC10686542 DOI: 10.1021/acs.organomet.2c00316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ni-NHCs (NHC = N-heterocyclic carbene) have become an increasingly important class of complexes in catalysis and organometallic chemistry owing to the beneficial features of nickel as an abundant 3d metal. However, the development of well-defined and air-stable Ni-NHC complexes for cross-coupling has been more challenging than with Pd-NHC catalysis because of less defined reactivity trends of NHC ancillary ligands coordinated to Ni. Herein, we report the synthesis and catalytic activity of well-defined [Ni(NHC)(η5-Cp)Cl] complexes bearing recently commercialized IPr# family of ligands (Sigma Aldrich) and versatile cyclopentadienyl throw-away ligand. The NHC ligands, IPr#, Np# and BIAN-IPr#, are prepared by robust and modular peralkylation of anilines. Most crucially, we identified [Ni(Np#)(η5-Cp)Cl] as a highly reactive [Ni(NHC)(η5-Cp)Cl] complex, with the reactivity outperforming the classical [Ni(IPr)(η5-Cp)Cl] (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene). These [Ni(NHC)(η5-Cp)Cl] precatalysts were employed in the Suzuki and Kumada cross-coupling of aryl chlorides and aryl bromides. Computational studies were conducted to determine steric effect and bond order analysis. Considering the attractive features of well-defined Ni-NHCs, we anticipate that this class of bulky and flexible Ni-NHC catalysts will find broad application in organic synthesis and catalysis.
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Affiliation(s)
- Md Mahbubur Rahman
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Qun Zhao
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Guangrong Meng
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Roman Szostak
- Department of Chemistry, Wroclaw University, F. Joliot-Curie 14, Wroclaw 50-383, Poland
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
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2
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Correia Bicho BA, Guthardt R, Bruhn C, Großhennig D, Orth T, Pfeiffer F, Siemeling U. N
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tert
‐Alkyl‐Substituted N‐Heterocyclic Carbenes with a 1,1’‐Ferrocenediyl Backbone. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202101014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Bruno A. Correia Bicho
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Robin Guthardt
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Clemens Bruhn
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - David Großhennig
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Till Orth
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Florian Pfeiffer
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
| | - Ulrich Siemeling
- Institute of Chemistry University of Kassel Heinrich-Plett-Straße 40 34132 Kassel Germany
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3
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van Vuuren E, Malan FP, Landman M. Multidentate NHC complexes of group IX metals featuring carbon-based tethers: Synthesis and applications. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213731] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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4
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Lu SJ, Yang HH, Chang WJ, Hsueh HH, Lin YC, Liu FC, Lin IJ, Lee GH. Synthesis and structures of amido-functionalized N-heterocyclic nickel(II) carbene complexes. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121543] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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5
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Ulm F, Cornaton Y, Djukic J, Chetcuti MJ, Ritleng V. Hydroboration of Alkenes Catalysed by a Nickel N‐Heterocyclic Carbene Complex: Reaction and Mechanistic Aspects. Chemistry 2020; 26:8916-8925. [DOI: 10.1002/chem.202000289] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 03/24/2020] [Indexed: 12/19/2022]
Affiliation(s)
- Franck Ulm
- Université de StrasbourgEcole européenne de Chimie, Polymères et MatériauxCNRS, LIMA UMR 7042 67000 Strasbourg France
| | - Yann Cornaton
- Université de StrasbourgCNRS, Institut de Chimie de Strasbourg UMR 7177 67000 Strasbourg France
| | - Jean‐Pierre Djukic
- Université de StrasbourgCNRS, Institut de Chimie de Strasbourg UMR 7177 67000 Strasbourg France
| | - Michael J. Chetcuti
- Université de StrasbourgEcole européenne de Chimie, Polymères et MatériauxCNRS, LIMA UMR 7042 67000 Strasbourg France
| | - Vincent Ritleng
- Université de StrasbourgEcole européenne de Chimie, Polymères et MatériauxCNRS, LIMA UMR 7042 67000 Strasbourg France
- Institut Universitaire de France 1 rue Descartes 75000 Paris France
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6
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Synthesis and catalytic application of cyclopentadienyl nickel(II) N-heterocyclic carbene complexes. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1786543] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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7
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Cervantes‐Reyes A, Rominger F, Hashmi ASK. Sterically Demanding Ag I and Cu I N-Heterocyclic Carbene Complexes: Synthesis, Structures, Steric Parameters, and Catalytic Activity. Chemistry 2020; 26:5530-5540. [PMID: 32104933 PMCID: PMC7216994 DOI: 10.1002/chem.202000600] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 02/27/2020] [Indexed: 12/13/2022]
Abstract
The synthesis and full characterization of new air-stable AgI and CuI complexes bearing structurally bulky expanded-ring N-heterocyclic carbene (erNHC) ligands is presented. The condensation of protonated NHC salts with Ag2 O afforded a collection of AgI complexes, and their first use as ligand transfer reagents led to novel isostructural CuI or AuI complexes. In situ deprotonation of the NHC salts in the presence of a copper(I) source, provides a library of new CuI complexes. The solid-state structures feature large N-CNHC -N angles (118-128°) and almost identical angles between the aryl groups on the nitrogen atoms and the plane of the N-C-N unit of the carbene (i.e. torsion angles close to 0°). Among the steric parameters, the percent buried volume (%Vbur ) values span easily in the 50-57 % range, and that one of (9-Dipp)CuBr complex (%Vbur =57.5) overcomes to other known erNHC-metal complexes reported to date. Preliminary catalytic experiments in the copper-catalyzed coupling between N-tosylhydrazone and phenylacetylene, afforded 76-93 % product at the 0.5-2.5 mol % catalyst loading, proving the stability of CuI erNHC complexes at elevated temperatures (100 °C).
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Affiliation(s)
| | - Frank Rominger
- Organisch-Chemisches InstitutHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - A. Stephen K. Hashmi
- Organisch-Chemisches InstitutHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
- Chemistry DepartmentFaculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia
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8
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Modak S, Borah S, Prakasham A, Shaikh MM, Butcher RJ, Gangwar M, Ghosh P. A comparison between (a/n-NHC)PdX2(pyridine) and (a/n-NHC)2PdX2 (X = I, Cl) type complexes of abnormal fused-bicyclic imidazo[1,2-a]pyridine based N-heterocyclic carbene (a-NHC) and of normal imidazole based N-heterocyclic carbene (n-NHC) ligands in the Suzuki-Miyaura coupling reactions. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.119090] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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9
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Banach Ł, Guńka P, Zachara J, Buchowicz W. Half-sandwich Ni(II) complexes [Ni(Cp)(X)(NHC)]: From an underestimated discovery to a new chapter in organonickel chemistry. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.03.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Heravi MM, Zadsirjan V, Hajiabbasi P, Hamidi H. Advances in Kumada–Tamao–Corriu cross-coupling reaction: an update. MONATSHEFTE FUR CHEMIE 2019. [DOI: 10.1007/s00706-019-2364-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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11
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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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12
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Bhat IA, Avinash I, Anantharaman G. Nickel(II)- and Palladium(II)-NHC Complexes from Hydroxypyridine Functionalized C,O Chelate Type Ligands: Synthesis, Structure, and Catalytic Activity toward Kumada–Tamao–Corriu Reaction. Organometallics 2019. [DOI: 10.1021/acs.organomet.8b00878] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Irshad Ahmad Bhat
- Department of Chemistry, Indian Institute of Technology, Kanpur-208016, India
- S. A. M. Degree College, Budgam, Jammu and Kashmir, 191111, India
| | - Iruthayaraj Avinash
- Department of Chemistry, Indian Institute of Technology, Kanpur-208016, India
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13
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Hall JW, Unson DML, Brunel P, Collins LR, Cybulski MK, Mahon MF, Whittlesey MK. Copper-NHC-Mediated Semihydrogenation and Hydroboration of Alkynes: Enhanced Catalytic Activity Using Ring-Expanded Carbenes. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00467] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jonathan W. Hall
- Department of Chemistry, University of Bath, Claverton
Down, Bath BA2 7AY, United Kingdom
| | - Darcy M. L. Unson
- Department of Chemistry, University of Bath, Claverton
Down, Bath BA2 7AY, United Kingdom
| | - Paul Brunel
- Department of Chemistry, University of Bath, Claverton
Down, Bath BA2 7AY, United Kingdom
| | - Lee R. Collins
- Department of Chemistry, University of Bath, Claverton
Down, Bath BA2 7AY, United Kingdom
| | - Mateusz K. Cybulski
- Department of Chemistry, University of Bath, Claverton
Down, Bath BA2 7AY, United Kingdom
| | - Mary F. Mahon
- Department of Chemistry, University of Bath, Claverton
Down, Bath BA2 7AY, United Kingdom
| | - Michael K. Whittlesey
- Department of Chemistry, University of Bath, Claverton
Down, Bath BA2 7AY, United Kingdom
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14
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Asano E, Hatayama Y, Kurisu N, Ohtani A, Hashimoto T, Kurihara Y, Ueda K, Ishihara S, Nagao H, Yamaguchi Y. Acetylacetonato-based pincer-type nickel(ii) complexes: synthesis and catalysis in cross-couplings of aryl chlorides with aryl Grignard reagents. Dalton Trans 2018; 47:8003-8012. [PMID: 29869657 DOI: 10.1039/c8dt01295d] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, three different types of acetylacetonato-based pincer-type nickel(ii) complexes (2) were prepared. Complex 2a possessed the tridentate ONN ligand, which was constructed by the condensation reaction of acetylacetone with N,N-diethylethylenediamine. Complex 2b contained the PPh2 donor group in contrast to the NEt2 group in 2a, i.e., an ONP ligand framework. Complex 2c was composed of the NNN ligand, which was prepared by the reaction of 4-((2,4,6-trimethylphenyl)amino)pent-3-en-2-one with N,N-diethylethylenediamine. In addition to X-ray diffraction analysis, these complexes were characterized spectroscopically. Their catalytic activity for a cross-coupling reaction of aryl halides with aryl Grignard reagents was also evaluated. Among these complexes, 2b acted as an effective catalyst for the cross-coupling reaction using aryl chlorides as electrophiles. The electronic properties of these Ni(ii) complexes were investigated by cyclic voltammetry and density functional theory calculations.
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Affiliation(s)
- Erika Asano
- Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
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15
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Liu QX, Zhao DX, Wu H, Zhao ZX, Lv SZ. Catalytic activities of NHC-PdCl2
species based on functionalized tetradentate imidazolium salt in three types of C-C coupling reactions. Appl Organomet Chem 2018. [DOI: 10.1002/aoc.4429] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Qing-Xiang Liu
- Key Laboratory of Inorganic-Organic Hybrid Functional Materials Chemistry (Tianjin Normal University), Ministry of Education, College of Chemistry; Tianjin Normal University; Tianjin 300387 China
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry; Tianjin Normal University; Tianjin 300387 China
| | - Dong-Xue Zhao
- Key Laboratory of Inorganic-Organic Hybrid Functional Materials Chemistry (Tianjin Normal University), Ministry of Education, College of Chemistry; Tianjin Normal University; Tianjin 300387 China
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry; Tianjin Normal University; Tianjin 300387 China
| | - Hao Wu
- Key Laboratory of Inorganic-Organic Hybrid Functional Materials Chemistry (Tianjin Normal University), Ministry of Education, College of Chemistry; Tianjin Normal University; Tianjin 300387 China
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry; Tianjin Normal University; Tianjin 300387 China
| | - Zhi-Xiang Zhao
- Key Laboratory of Inorganic-Organic Hybrid Functional Materials Chemistry (Tianjin Normal University), Ministry of Education, College of Chemistry; Tianjin Normal University; Tianjin 300387 China
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry; Tianjin Normal University; Tianjin 300387 China
| | - Shi-Zhen Lv
- Key Laboratory of Inorganic-Organic Hybrid Functional Materials Chemistry (Tianjin Normal University), Ministry of Education, College of Chemistry; Tianjin Normal University; Tianjin 300387 China
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry; Tianjin Normal University; Tianjin 300387 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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Natarajan N, Chavagnan T, Sémeril D, Brenner E, Matt D, Ramesh R, Toupet L. Cavitand Chemistry: Nickel Half‐Sandwich Complexes with Imidazolylidene Ligands Bearing One or Two Resorcinarenyl Substituents. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201701143] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Nallusamy Natarajan
- Laboratoire de Chimie Inorganique Moléculaire et Catalyse UMR 7177 CNRS Université de Strasbourg 4 rue Blaise Pascal 67008 Strasbourg France
| | - Thierry Chavagnan
- Laboratoire de Chimie Inorganique Moléculaire et Catalyse UMR 7177 CNRS Université de Strasbourg 4 rue Blaise Pascal 67008 Strasbourg France
| | - David Sémeril
- Laboratoire de Chimie Inorganique Moléculaire et Catalyse UMR 7177 CNRS Université de Strasbourg 4 rue Blaise Pascal 67008 Strasbourg France
| | - Eric Brenner
- Laboratoire de Chimie Inorganique Moléculaire et Catalyse UMR 7177 CNRS Université de Strasbourg 4 rue Blaise Pascal 67008 Strasbourg France
| | - Dominique Matt
- Laboratoire de Chimie Inorganique Moléculaire et Catalyse UMR 7177 CNRS Université de Strasbourg 4 rue Blaise Pascal 67008 Strasbourg France
| | - Rengan Ramesh
- Centre for Organometallic Chemistry School of Chemistry Bharathidasan University 620 024 Tiruchirappalli Tamil Nadu India
| | - Loïc Toupet
- Institut de Physique UMR 6251 CNRS Université de Rennes 1 Campus de Beaulieu 35042 Rennes Cedex France
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18
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Ulm F, Poblador-Bahamonde AI, Choppin S, Bellemin-Laponnaz S, Chetcuti MJ, Achard T, Ritleng V. Synthesis, characterization, and catalytic application in aldehyde hydrosilylation of half-sandwich nickel complexes bearing (κ1-C)- and hemilabile (κ2-C,S)-thioether-functionalised NHC ligands. Dalton Trans 2018; 47:17134-17145. [DOI: 10.1039/c8dt03882a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Ni complexes bearing thioether-functionalised NHCs; hemilabile ligands for catalytic aldehyde hydrosilylation.
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Affiliation(s)
- Franck Ulm
- Université de Strasbourg
- Université de Haute-Alsace
- CNRS
- LIMA
- UMR 7042
| | | | - Sabine Choppin
- Université de Strasbourg
- Université de Haute-Alsace
- CNRS
- LIMA
- UMR 7042
| | - Stéphane Bellemin-Laponnaz
- Institut de Physique et Chimie des Matériaux de Strasbourg
- CNRS
- Université de Strasbourg
- UMR 7504
- 67000 Strasbourg
| | | | - Thierry Achard
- Institut de Physique et Chimie des Matériaux de Strasbourg
- CNRS
- Université de Strasbourg
- UMR 7504
- 67000 Strasbourg
| | - Vincent Ritleng
- Université de Strasbourg
- Université de Haute-Alsace
- CNRS
- LIMA
- UMR 7042
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19
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Ellul CE, Lowe JP, Mahon MF, Raithby PR, Whittlesey MK. [Ru3(6-NHC)(CO)10]: synthesis, characterisation and reactivity of rare 46-electron tri-ruthenium clusters. Dalton Trans 2018; 47:4518-4523. [DOI: 10.1039/c8dt00189h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The room temperature reaction of 6-membered ring N-heterocyclic carbenes with [Ru3(CO)12] affords [Ru3(6-NHC)(CO)10], rare examples of coordinatively unsaturated, 46-electron tri-ruthenium clusters. Upon mild heating in the presence of C5H5N, H2 or PPh3, these compounds lose carbene.
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Affiliation(s)
| | - John P. Lowe
- Department of Chemistry
- University of Bath
- Claverton Down
- UK
| | - Mary F. Mahon
- Department of Chemistry
- University of Bath
- Claverton Down
- UK
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20
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Synthesis, characterization and catalytic activity of nickel NHC complexes. MOLECULAR CATALYSIS 2017. [DOI: 10.1016/j.mcat.2017.06.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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21
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Buchowicz W, Banach Ł, Kamiński R, Buchalski P. Axially chiral racemic half-sandwich nickel(ii) complexes by ring-closing metathesis. Dalton Trans 2017; 46:3805-3808. [PMID: 28224145 DOI: 10.1039/c6dt04811k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A remarkable nickelacycle has been synthesised via olefin metathesis of the α,ω-diene complex [Ni(η5-C5H4R)(Br)(NHC)] (R = C(CH3)2CH2CH[double bond, length as m-dash]CH2, NHC = 1-(6-hexenyl)-3-(2,4,6-trimethylphenyl)-imidazol-2-ylidene). Single-crystal X-ray analysis reveals a helical shape of the molecule and stretching of some interatomic distances in the Ni(ii) coordination sphere. The Cp-NHC tethered complex shows catalytic activity resembling that of the parent complexes.
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Affiliation(s)
- Włodzimierz Buchowicz
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland.
| | - Łukasz Banach
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland.
| | - Radosław Kamiński
- Department of Chemistry, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Piotr Buchalski
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland.
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Pelties S, Carter E, Folli A, Mahon MF, Murphy DM, Whittlesey MK, Wolf R. Influence of Ring-Expanded N-Heterocyclic Carbenes on the Structures of Half-Sandwich Ni(I) Complexes: An X-ray, Electron Paramagnetic Resonance (EPR), and Electron Nuclear Double Resonance (ENDOR) Study. Inorg Chem 2016; 55:11006-11017. [PMID: 27731984 DOI: 10.1021/acs.inorgchem.6b01540] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Potassium graphite reduction of the half-sandwich Ni(II) ring-expanded diamino/diamidocarbene complexes CpNi(RE-NHC)Br gave the Ni(I) derivatives CpNi(RE-NHC) (where RE-NHC = 6-Mes (1), 7-Mes (2), 6-MesDAC (3)) in yields of 40%-50%. The electronic structures of paramagnetic 1-3 were investigated by CW X-/Q-band electron paramagnetic resonance (EPR) and Q-band 1H electron nuclear double resonance (ENDOR) spectroscopy. While small variations in the g-values were observed between the diaminocarbene complexes 1 and 2, pronounced changes in the g-values were detected between the almost isostructural species (1) and diamidocarbene species (3). These results highlight the sensitivity of the EPR g-tensor to changes in the electronic structure of the Ni(I) centers generated by incorporation of heteroatom substituents onto the backbone ring positions. Variable-temperature EPR analysis also revealed the presence of a second Ni(I) site in 3. The experimental g-values for these two Ni(I) sites detected by EPR in frozen solutions of 3 are consistent with resolution on the EPR time scale of the disordered components evident in the X-ray crystallographically determined structure and the corresponding density functional theory (DFT)-calculated g-tensor. Q-band 1H ENDOR measurements revealed a small amount of unpaired electron spin density on the Cp rings, consistent with the calculated SOMO of complexes 1-3. The magnitude of the 1H A values for 3 were also notably larger, compared to 1 and 2, again highlighting the influence of the diamidocarbene on the electronic properties of 3.
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Affiliation(s)
- Stefan Pelties
- Institute of Inorganic Chemistry, University of Regensburg , 93040 Regensburg, Germany
| | - Emma Carter
- School of Chemistry, Cardiff University , Park Place, Cardiff CF10 3AT, United Kingdom
| | - Andrea Folli
- School of Chemistry, Cardiff University , Park Place, Cardiff CF10 3AT, United Kingdom
| | - Mary F Mahon
- Department of Chemistry, University of Bath , Claverton Down, Bath BA2 7AY, United Kingdom
| | - Damien M Murphy
- School of Chemistry, Cardiff University , Park Place, Cardiff CF10 3AT, United Kingdom
| | - Michael K Whittlesey
- Department of Chemistry, University of Bath , Claverton Down, Bath BA2 7AY, United Kingdom
| | - Robert Wolf
- Institute of Inorganic Chemistry, University of Regensburg , 93040 Regensburg, Germany
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