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Vasanthakumar A, Price JS, Emslie DJH. Rare earth dialkyl cations and monoalkyl dications supported by a rigid neutral pincer ligand: synthesis and ethylene polymerization. Chem Sci 2023; 14:8514-8523. [PMID: 37592999 PMCID: PMC10430518 DOI: 10.1039/d3sc01830j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 07/15/2023] [Indexed: 08/19/2023] Open
Abstract
A palladium-catalyzed coupling reaction between 4,5-dibromo-2,7-di-tert-butyl-9,9-dimethylxanthene and 2 equiv. of 1,3-diisopropylimidazolin-2-imine afforded the rigid neutral 2,7-di-tert-butyl-4,5-bis(1,3-diisopropylimidazolin-2-imino)-9,9-dimethylxanthene (XII2) pincer ligand. Reaction of XII2 with YCl3(THF)3.5 provided [(XII2)YCl3] (1). However, compound 1 failed to react cleanly with 3 equiv. of LiCH2SiMe3, and the reaction of XII2 with [Y(CH2SiMe3)3(THF)2] afforded a complex mixture of products. To access group 3 alkyl complexes without the intermediacy of [(XII2)M(CH2SiMe3)3], the XII2 ligand was protonated using [H(OEt2)2][B(C6F5)4] to form [H(XII2)][B(C6F5)4], and subsequent reaction with [M(CH2SiMe3)3(THF)2] (M = Y, Sc) directly afforded the cationic scandium and yttrium dialkyl complexes [(XII2)M(CH2SiMe3)2][B(C6F5)4] {M = Y (2) and Sc (3)}. Reaction of 3 with B(C6F5)3 in C6D5Br afforded dicationic [(XII2)Sc(CH2SiMe2CH2SiMe3)][MeB(C6F5)3][B(C6F5)4] (4) featuring a CH2SiMe2CH2SiMe3 ligand, formed as a result of methyl anion abstraction from silicon, with concomitant migration of the neighbouring CH2SiMe3 group from scandium to silicon. The MeB(C6F5)3 anion in 4 forms a contact ion pair. By contrast, reaction of 1 with [CPh3][B(C6F5)3] in C6D5Br/toluene or o-C6H4F2/toluene afforded dicationic [(XII2)Sc(CH2SiMe3)(ηx-toluene)n][B(C6F5)4]2 (5). Compounds 2-4 showed negligible ethylene polymerization activity, whereas 5 is highly active (up to 870 kg mol-1 h-1 atm-1 in o-C6H4F2/toluene under 1 atm of ethylene at room temperature).
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Affiliation(s)
- Aathith Vasanthakumar
- Department of Chemistry, McMaster University 1280 Main Street West Hamilton Ontario L8S 4M1 Canada
| | - Jeffrey S Price
- Department of Chemistry, McMaster University 1280 Main Street West Hamilton Ontario L8S 4M1 Canada
| | - David J H Emslie
- Department of Chemistry, McMaster University 1280 Main Street West Hamilton Ontario L8S 4M1 Canada
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Takegasa S, Lee MM, Tokuhiro K, Nakano R, Yamashita M. Rhodium‐Catalyzed Acrylate Synthesis from Carbon Dioxide and Ethylene by using a Guanidine‐Based Pincer Ligand: Perturbing Occupied d‐Orbitals by pπ‐dπ Repulsion Makes a Difference. Chemistry 2022; 28:e202201870. [DOI: 10.1002/chem.202201870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Shinnosuke Takegasa
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Tokai National Higher Education and Research System Nagoya University Furo-cho, Chikusa-ku Nagoya 464-8603 Japan
| | - Ming Min Lee
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Tokai National Higher Education and Research System Nagoya University Furo-cho, Chikusa-ku Nagoya 464-8603 Japan
| | - Kei Tokuhiro
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Tokai National Higher Education and Research System Nagoya University Furo-cho, Chikusa-ku Nagoya 464-8603 Japan
| | - Ryo Nakano
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Tokai National Higher Education and Research System Nagoya University Furo-cho, Chikusa-ku Nagoya 464-8603 Japan
| | - Makoto Yamashita
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Tokai National Higher Education and Research System Nagoya University Furo-cho, Chikusa-ku Nagoya 464-8603 Japan
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Rudolf R, Neuman NI, Walter RRM, Ringenberg MR, Sarkar B. Mesoionic Imines (MIIs): Strong Donors and Versatile Ligands for Transition Metals and Main Group Substrates. Angew Chem Int Ed Engl 2022; 61:e202200653. [PMID: 35286004 PMCID: PMC9322014 DOI: 10.1002/anie.202200653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Indexed: 11/08/2022]
Abstract
We report the synthesis and the reactivity of 1,2,3-triazolin-5-imine type mesoionic imines (MIIs). The MIIs are accessible by a base-mediated cycloaddition between a substituted acetonitrile and an aromatic azide, methylation by established routes and subsequent deprotonation. C=O-stretching frequencies in MII-CO2 and -Rh(CO)2 Cl complexes were used to determine the overall donor strength. The MIIs are stronger donors than the N-heterocyclic imines (NHIs). MIIs are excellent ligands for main group elements and transition metals in which they display substituent-induced fluorine-specific interactions and undergo C-H activation. DFT calculations gave insights into the frontier orbitals of the MIIs. The calculations predict a relatively small HOMO-LUMO gap compared to other related ligands. MIIs are potentially able to act as both π-donor and π-acceptor ligands. This report highlights the potential of MIIs to display exciting properties with a huge potential for future development.
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Affiliation(s)
- Richard Rudolf
- Lehrstuhl für Anorganische KoordinationschemieInstitut für Anorganische ChemieUniversity of StuttgartPfaffenwaldring 5570569StuttgartGermany
| | - Nicolás I. Neuman
- Lehrstuhl für Anorganische KoordinationschemieInstitut für Anorganische ChemieUniversity of StuttgartPfaffenwaldring 5570569StuttgartGermany
- Instituto de Desarrollo Tecnológico para la Industria QuímicaINTEC, UNL-CONICET Predio CONICET Santa Fe “Dr. Alberto Cassano”Colectora Ruta Nacional 168, Km 0Paraje El PozoS3000ZAA) Santa FeArgentina
| | - Robert R. M. Walter
- Lehrstuhl für Anorganische KoordinationschemieInstitut für Anorganische ChemieUniversity of StuttgartPfaffenwaldring 5570569StuttgartGermany
| | - Mark. R. Ringenberg
- Lehrstuhl für Anorganische KoordinationschemieInstitut für Anorganische ChemieUniversity of StuttgartPfaffenwaldring 5570569StuttgartGermany
| | - Biprajit Sarkar
- Lehrstuhl für Anorganische KoordinationschemieInstitut für Anorganische ChemieUniversity of StuttgartPfaffenwaldring 5570569StuttgartGermany
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Rudolf R, Neuman NI, Walter RRM, Ringenberg MR, Sarkar B. Mesoionische Imine (MIIs): Starke Donoren und vielseitige Liganden für Übergangsmetalle und Hauptgruppensubstrate. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202200653] [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)
- Richard Rudolf
- Lehrstuhl für Anorganische Koordinationschemie Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Nicolás I. Neuman
- Lehrstuhl für Anorganische Koordinationschemie Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Deutschland
- Instituto de Desarrollo Tecnológico para la Industria Química CINTEC, VUNL-CONICET VPredio CONICET Santa Fe “Dr. Alberto Cassano“ Colectora Ruta Nacional 168, Km 0 Paraje El Pozo S3000ZAA) Santa Fe Argentinien
| | - Robert R. M. Walter
- Lehrstuhl für Anorganische Koordinationschemie Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Mark. R. Ringenberg
- Lehrstuhl für Anorganische Koordinationschemie Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Biprajit Sarkar
- Lehrstuhl für Anorganische Koordinationschemie Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Deutschland
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Azzam RA, Elgemeie GH, Seif MM, Jones PG. Crystal structure of N'-[2-(benzo[ d]thia-zol-2-yl)acet-yl]benzohydrazide, an achiral compound crystallizing in space group P1 with Z = 1. Acta Crystallogr E Crystallogr Commun 2021; 77:891-894. [PMID: 34584756 PMCID: PMC8423019 DOI: 10.1107/s2056989021007672] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 07/27/2021] [Indexed: 12/01/2022]
Abstract
In the mol-ecule of the title compound, C16H13N3O2S, one hydrazinic nitro-gen atom is essentially planar, but the other is slightly pyramidalized. The torsion angle about the hydrazinic bond is 66.44 (15)°. Both hydrazinic hydrogen atoms lie anti-periplanar to the oxygen of the adjacent carbonyl group. The mol-ecular packing is a layer structure determined by two classical hydrogen bonds, N-H⋯O=C and N-H⋯Nthia-zole. The space group is P1 with Z = 1, which is unusual for an achiral organic compound.
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Affiliation(s)
- Rasha A. Azzam
- Chemistry Department, Faculty of Science, Helwan University, Cairo, Egypt
| | - Galal H. Elgemeie
- Chemistry Department, Faculty of Science, Helwan University, Cairo, Egypt
| | - Mona M. Seif
- Chemistry Department, Faculty of Science, Helwan University, Cairo, Egypt
| | - Peter G. Jones
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany
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Oheix E, Herrero C, Moutet J, Rebilly JN, Cordier M, Guillot R, Bourcier S, Banse F, Sénéchal-David K, Auffrant A. Fe III and Fe II Phosphasalen Complexes: Synthesis, Characterization, and Catalytic Application for 2-Naphthol Oxidative Coupling. Chemistry 2020; 26:13634-13643. [PMID: 32463553 DOI: 10.1002/chem.202001662] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Indexed: 01/14/2023]
Abstract
We report on the synthesis and characterization of three iron(III) phosphasalen complexes, [FeIII (Psalen)(X)] differing in the nature of the counter-anion/exogenous ligand (X- =Cl- , NO3 - , OTf- ), as well as the neutral iron(II) analogue, [FeII (Psalen)]. Phosphasalen (Psalen) differs from salen by the presence of iminophosphorane (P=N) functions in place of the imines. All the complexes were characterized by single-crystal X-ray diffraction, UV/Vis, EPR, and cyclic voltammetry. The [FeII (Psalen)] complex was shown to remain tetracoordinated even in coordinating solvent but surprisingly exhibits a magnetic moment in line with a FeII high-spin ground state. For the FeIII complexes, the higher lability of triflate anion compared to nitrate was demonstrated. As they exhibit lower reduction potentials compared to their salen analogues, these complexes were tested for the coupling of 2-naphthol using O2 from air as oxidant. In order to shed light on this reaction, the interaction between 2-naphthol and the FeIII (Psalen) complexes was studied by cyclic voltammetry as well as UV/Vis spectroscopy.
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Affiliation(s)
- Emmanuel Oheix
- Laboratoire de Chimie Moléculaire, CNRS UMR 9168, École Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France.,CNRS, UMR 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, 91405, Orsay, France
| | - Christian Herrero
- CNRS, UMR 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, 91405, Orsay, France
| | - Jules Moutet
- Laboratoire de Chimie Moléculaire, CNRS UMR 9168, École Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France
| | - Jean-Noël Rebilly
- CNRS, UMR 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, 91405, Orsay, France
| | - Marie Cordier
- Laboratoire de Chimie Moléculaire, CNRS UMR 9168, École Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France
| | - Régis Guillot
- CNRS, UMR 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, 91405, Orsay, France
| | - Sophie Bourcier
- Laboratoire de Chimie Moléculaire, CNRS UMR 9168, École Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France
| | - Frédéric Banse
- CNRS, UMR 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, 91405, Orsay, France
| | - Katell Sénéchal-David
- CNRS, UMR 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, 91405, Orsay, France
| | - Audrey Auffrant
- Laboratoire de Chimie Moléculaire, CNRS UMR 9168, École Polytechnique, Institut Polytechnique de Paris, 91128, Palaiseau, France
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Wagner C, Kreis F, Popp D, Hübner O, Kaifer E, Himmel H. 1,2,4,5-Tetrakis(tetramethylguanidino)-3,6-diethynyl-benzenes: Fluorescent Probes, Redox-Active Ligands and Strong Organic Electron Donors. Chemistry 2020; 26:10336-10347. [PMID: 32368816 PMCID: PMC7497081 DOI: 10.1002/chem.202001557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 04/30/2020] [Indexed: 11/25/2022]
Abstract
In this work, the change of reactivity induced by the introduction of two para-ethynyl substituents (CCSi(iPr)3 or CCH) to the organic electron-donor 1,2,4,5-tetrakis(tetramethylguanidino)-benzene is evaluated. The redox-properties and redox-state dependent fluorescence are evaluated, and dinuclear CuI and CuII complexes synthesized. The Lewis-acidic B(C6 F5 )3 substitutes the proton of the ethynyl -CCH groups to give new anionic -CCB(C6 F5 )3 - substituents, leading eventually to a novel dianionic strong electron donor in its diprotonated form. Its two-electron oxidation with dioxygen in the presence of a copper catalyst yields the first redox-active guanidine that is neutral (instead of cationic) in its oxidized form.
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Affiliation(s)
- Conrad Wagner
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Franka Kreis
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Dennis Popp
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Olaf Hübner
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Elisabeth Kaifer
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Hans‐Jörg Himmel
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
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8
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Recent advances in the chemistry of group 9—Pincer organometallics. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2020. [DOI: 10.1016/bs.adomc.2019.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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9
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Doddi A, Peters M, Tamm M. N-Heterocyclic Carbene Adducts of Main Group Elements and Their Use as Ligands in Transition Metal Chemistry. Chem Rev 2019; 119:6994-7112. [PMID: 30983327 DOI: 10.1021/acs.chemrev.8b00791] [Citation(s) in RCA: 302] [Impact Index Per Article: 60.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
N-Heterocyclic carbenes (NHC) are nowadays ubiquitous and indispensable in many research fields, and it is not possible to imagine modern transition metal and main group element chemistry without the plethora of available NHCs with tailor-made electronic and steric properties. While their suitability to act as strong ligands toward transition metals has led to numerous applications of NHC complexes in homogeneous catalysis, their strong σ-donating and adaptable π-accepting abilities have also contributed to an impressive vitalization of main group chemistry with the isolation and characterization of NHC adducts of almost any element. Formally, NHC coordination to Lewis acids affords a transfer of nucleophilicity from the carbene carbon atom to the attached exocyclic moiety, and low-valent and low-coordinate adducts of the p-block elements with available lone pairs and/or polarized carbon-element π-bonds are able to act themselves as Lewis basic donor ligands toward transition metals. Accordingly, the availability of a large number of novel NHC adducts has not only produced new varieties of already existing ligand classes but has also allowed establishment of numerous complexes with unusual and often unprecedented element-metal bonds. This review aims at summarizing this development comprehensively and covers the usage of N-heterocyclic carbene adducts of the p-block elements as ligands in transition metal chemistry.
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Affiliation(s)
- Adinarayana Doddi
- Technische Universität Braunschweig, Institut für Anorganische und Analytische Chemie, Hagenring 30, 38106 Braunschweig, Germany
| | - Marius Peters
- Technische Universität Braunschweig, Institut für Anorganische und Analytische Chemie, Hagenring 30, 38106 Braunschweig, Germany
| | - Matthias Tamm
- Technische Universität Braunschweig, Institut für Anorganische und Analytische Chemie, Hagenring 30, 38106 Braunschweig, Germany
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Hakey BM, Darmon JM, Zhang Y, Petersen JL, Milsmann C. Synthesis and Electronic Structure of Neutral Square-Planar High-Spin Iron(II) Complexes Supported by a Dianionic Pincer Ligand. Inorg Chem 2019; 58:1252-1266. [PMID: 30608668 DOI: 10.1021/acs.inorgchem.8b02730] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Two square-planar high-spin FeII complexes bearing a dianionic pyridine dipyrrolate pincer ligand and a diethyl ether or tetrahydrofuran ligand were synthesized and structurally characterized, and their electronic structures were elucidated by a combined spectroscopic and computational approach. In contrast to previous examples, the S = 2 ground states of these square-planar FeII complexes do not require an overall anionic charge of the compounds or incorporation of alkali metal cations. The tetrahydrofuran complex exhibits an equilibrium between four- and five-coordinate species in solution, which was supported by 1H NMR and 57Fe Mössbauer spectroscopy and comparison to a structurally characterized five-coordinate pyridine dipyrrolate iron bis-pyridine adduct. A detailed computational analysis of the electronic structures of the four- and five-coordinate species via density functional theory provides insight into the origins of the unusual ground state configurations for FeII in a square-planar ligand field and explains the associated characteristic spectroscopic parameters.
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Affiliation(s)
- Brett M Hakey
- C. Eugene Bennett Department of Chemistry , West Virginia University , 100 Prospect Street , Morgantown , West Virginia 26506 , United States
| | - Jonathan M Darmon
- Department of Chemistry , Princeton University , Princeton , New Jersey 08544 , United States
| | - Yu Zhang
- C. Eugene Bennett Department of Chemistry , West Virginia University , 100 Prospect Street , Morgantown , West Virginia 26506 , United States
| | - Jeffrey L Petersen
- C. Eugene Bennett Department of Chemistry , West Virginia University , 100 Prospect Street , Morgantown , West Virginia 26506 , United States
| | - Carsten Milsmann
- C. Eugene Bennett Department of Chemistry , West Virginia University , 100 Prospect Street , Morgantown , West Virginia 26506 , United States
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Kaur-Ghumaan S, Hasche P, Spannenberg A, Beweries T. Nickel(ii) PE1CE2P pincer complexes (E = O, S) for electrocatalytic proton reduction. Dalton Trans 2019; 48:16322-16329. [DOI: 10.1039/c9dt03626a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The catalytic activity of a series of nickel complexes with different phosphinite/thiophosphinite ligands for electrocatalytic proton reduction strongly depends on the nature of the pincer ligands.
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Affiliation(s)
- Sandeep Kaur-Ghumaan
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
- Department of Chemistry
- University of Delhi (North Campus)
| | - Patrick Hasche
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
| | - Anke Spannenberg
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
| | - Torsten Beweries
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- 18059 Rostock
- Germany
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Naktode K, Das S, Nayek HP, Panda TK. Reactivity of titanium imidazolin-2-iminato complexes with 2,6-diisopropylaniline and 2-{(2,6-diisopropylphenyl)-iminomethyl}pyrrole. J COORD CHEM 2018. [DOI: 10.1080/00958972.2018.1544705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Kishor Naktode
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, India
- Department of Chemistry, Nevjabai Hitkarini College Bramhapuri, Chandrapur, India
| | - Suman Das
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, India
| | - Hari Pada Nayek
- Department of Applied Chemistry, Indian Institute of Technology (ISM), Dhanbad, India
| | - Tarun K. Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, India
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Li M, Cai Z, Eisen MS. Neutral Nickel(II) Complexes Bearing Aryloxide Imidazolin-2-imine Ligands for Efficient Copolymerization of Norbornene and Polar Monomers. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00752] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mingyuan Li
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People’s Republic of China
| | - Zhengguo Cai
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People’s Republic of China
| | - Moris S. Eisen
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
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McSkimming A, Suess DLM. Selective Synthesis of Site-Differentiated Fe 4S 4 and Fe 6S 6 Clusters. Inorg Chem 2018; 57:14904-14912. [PMID: 30418746 DOI: 10.1021/acs.inorgchem.8b02684] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Obtaining rational control over the structure and nuclearity of metalloclusters is an ongoing challenge in synthetic Fe-S cluster chemistry. We report a new family of tridentate imidazolin-2-imine ligands L(NImR)3 that can bind [Fe4S4]2+ or [Fe6S6]3+ clusters, depending on the steric profile of the ligand and the reaction stoichiometry. A high-yielding synthetic route to L(NImR)3 ligands (where R is the imidazolyl N substituents) from trianiline and 2-chloroimidazolium precursors is described. For L(NImMe)3 (tris(1,3,5-(3-( N, N-dimethyl-4,5-diphenylimidazolin-2-imino)phenylmethyl))benzene), metalation with 1 equiv of [Ph4P]2[Fe4S4Cl4] and 3 equiv of NaBPh4 furnishes a mixture of products, but adjusting the stoichiometry to 1.5 equiv of [Ph4P]2[Fe4S4Cl4] provides (L(NImMe)3)Fe6S6Cl6 in high yield. Formation of an [Fe6S6]3+ cluster using L(NImTol)3 (tris(1,3,5-(3-( N, N-bis(4-methylphenyl)-4,5-diphenylimidazolin-2-imino)phenylmethyl))benzene) is not observed; instead, the [Fe4S4]2+ cluster [(L(NImTol)3)(Fe4S4Cl)][BPh4] is cleanly generated when 1 equiv of [Ph4P]2[Fe4S4Cl4] is employed. The selectivity for cluster nuclearity is rationalized by the orientation of the imidazolyl rings whereby long N-imidazolyl substituents preclude formation of [Fe6S6]3+ clusters but not [Fe4S4]2+ clusters. Thus, the structure and nuclearity of L(NImR)3-bound Fe-S clusters may be selectively controlled through rational modification the ligand's substituents.
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Affiliation(s)
- Alex McSkimming
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Daniel L M Suess
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
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Allen JE, Kassel WS, Piro NA. Synthesis, structures and characterization of complexes containing a 2,6-bis(guanidinyl)pyridine ligand on iron(II), cobalt(II), nickel(II), copper(I), copper(II) and zinc(II). Polyhedron 2018. [DOI: 10.1016/j.poly.2018.08.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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16
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Jungen S, Chen P. Alkyl Radical Generation by an Intramolecular Homolytic Substitution Reaction between Iron(II) and Trialkylsulfonium Groups. Chemistry 2018; 24:11008-11020. [PMID: 29768681 DOI: 10.1002/chem.201801952] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 05/15/2018] [Indexed: 11/08/2022]
Abstract
Intramolecular, homolytic substitution reactions between iron(II) species and various trialkylsulfonium groups were directly observed in the gas phase upon collision-induced dissociation. In spite of the notoriously low reduction potential of trialkylsulfonium species and the mismatched oxidation potential of iron(II), the reactions proceed at moderate collision energies, forming an alkyl radical as well as a thioether coordinated to the iron. In contrast to classical homolytic substitutions, the attacking radical is a "metalloradical", namely iron(II) that is oxidized to iron(III) during the reaction. With this process we demonstrate that the conceptually analogous, putative radical generation step in radical S-adenosyl methionine (SAM) enzymes is possible and plausible. Further, we show that this kind of reaction only occurs in constrained systems with a defined geometry. Combining experimental measurements with DFT studies and NBO analyses allowed us to gain insights into the reactivity and transition states of these systems. Based on our findings, we challenge the notion of a collinear transition state in the radical generation step of radical SAM enzymes and propose it to be bent instead.
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Affiliation(s)
- Stefan Jungen
- Laboratorium für Organische Chemie, Eidgenössische Technische Hochschule (ETH), Zürich, Switzerland
| | - Peter Chen
- Laboratorium für Organische Chemie, Eidgenössische Technische Hochschule (ETH), Zürich, Switzerland
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17
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Lawrence MAW, Mulder WH. SNS versus SNN Pincer Ligands: Electrochemical Studies and Their Palladium(II) Complexes as Electro-Catalyst for Proton Reduction. ChemistrySelect 2018. [DOI: 10.1002/slct.201802065] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Mark A. W. Lawrence
- Department of Chemistry; University of the West Indies, Mona Kingston 7; Jamaica W.I
- School of Natural and Applied Sciences; University of Technology; 237 Old Hope Road Kingston 6 Jamaica W.I
| | - Willem H. Mulder
- Department of Chemistry; University of the West Indies, Mona Kingston 7; Jamaica W.I
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18
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Ghannam J, Al Assil T, Pankratz TC, Lord RL, Zeller M, Lee WT. A Series of 4- and 5-Coordinate Ni(II) Complexes: Synthesis, Characterization, Spectroscopic, and DFT Studies. Inorg Chem 2018; 57:8307-8316. [DOI: 10.1021/acs.inorgchem.8b00958] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jack Ghannam
- Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, Illinois 60660, United States
| | - Talal Al Assil
- Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, Illinois 60660, United States
| | - Trey C. Pankratz
- Department of Chemistry, Grand Valley State University, Allendale, Michigan 49401, United States
| | - Richard L. Lord
- Department of Chemistry, Grand Valley State University, Allendale, Michigan 49401, United States
| | - Matthias Zeller
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Wei-Tsung Lee
- Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, Illinois 60660, United States
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19
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Li M, Shu X, Cai Z, Eisen MS. Synthesis, Structures, and Norbornene Polymerization Behavior of Neutral Nickel(II) and Palladium(II) Complexes Bearing Aryloxide Imidazolidin-2-imine Ligands. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00059] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Mingyuan Li
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People’s Republic of China
| | - Xin Shu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People’s Republic of China
| | - Zhengguo Cai
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People’s Republic of China
| | - Moris S. Eisen
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 32000, Israel
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20
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Pandiri H, Gonnade RG, Punji B. Synthesis of quinolinyl-based pincer copper(ii) complexes: an efficient catalyst system for Kumada coupling of alkyl chlorides and bromides with alkyl Grignard reagents. Dalton Trans 2018; 47:16747-16754. [DOI: 10.1039/c8dt03210f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Well-defined quinolinamide-based pincer copper complexes have been developed and demonstrated in the Kumada coupling reaction of nonactivated alkyl chlorides and bromides with alkyl magnesium chloride.
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Affiliation(s)
- Hanumanprasad Pandiri
- Organometallic Synthesis and Catalysis Group
- Chemical Engineering Division
- India
- Academy of Scientific and Innovative Research (AcSIR)
- New Delhi 110 020
| | - Rajesh G. Gonnade
- Centre for Material Characterization. CSIR–National Chemical Laboratory (CSIR–NCL)
- Pune – 411 008
- India
| | - Benudhar Punji
- Organometallic Synthesis and Catalysis Group
- Chemical Engineering Division
- India
- Academy of Scientific and Innovative Research (AcSIR)
- New Delhi 110 020
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21
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Tondreau AM, Michalczyk R, Boncella JM. Reversible 1,2-Addition of Water To Form a Nucleophilic Mn(I) Hydroxide Complex: A Thermodynamic and Reactivity Study. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00618] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aaron M. Tondreau
- Chemistry
Division and ‡Bioscience Division, Los Alamos National Laboratory, MS J514, Los Alamos, New Mexico 87545, United States
| | - Ryszard Michalczyk
- Chemistry
Division and ‡Bioscience Division, Los Alamos National Laboratory, MS J514, Los Alamos, New Mexico 87545, United States
| | - James M. Boncella
- Chemistry
Division and ‡Bioscience Division, Los Alamos National Laboratory, MS J514, Los Alamos, New Mexico 87545, United States
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22
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Garbe M, Junge K, Beller M. Homogeneous Catalysis by Manganese-Based Pincer Complexes. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700376] [Citation(s) in RCA: 241] [Impact Index Per Article: 34.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Marcel Garbe
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock; Albert-Einstein-Straße 29a 18055 Rostock Germany
| | - Kathrin Junge
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock; Albert-Einstein-Straße 29a 18055 Rostock Germany
| | - Matthias Beller
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock; Albert-Einstein-Straße 29a 18055 Rostock Germany
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23
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Jess K, Derdau V, Weck R, Atzrodt J, Freytag M, Jones PG, Tamm M. Hydrogen Isotope Exchange with Iridium(I) Complexes Supported by Phosphine-Imidazolin-2-imine P,N Ligands. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201601291] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Kristof Jess
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Volker Derdau
- Sanofi; R&D, Integrated Drug Discovery, Med. Chem., Isotope Chemistry & Metabolite Synthesis; Industriepark Höchst 65926 Frankfurt am Main Germany
| | - Remo Weck
- Sanofi; R&D, Integrated Drug Discovery, Med. Chem., Isotope Chemistry & Metabolite Synthesis; Industriepark Höchst 65926 Frankfurt am Main Germany
| | - Jens Atzrodt
- Sanofi; R&D, Integrated Drug Discovery, Med. Chem., Isotope Chemistry & Metabolite Synthesis; Industriepark Höchst 65926 Frankfurt am Main Germany
| | - Matthias Freytag
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Peter G. Jones
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
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24
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Jess K, Baabe D, Freytag M, Jones PG, Tamm M. Transition-Metal Complexes with Ferrocene-Bridged Bis(imidazolin-2-imine) and Bis(diaminocyclopropenimine) Ligands. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600841] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kristof Jess
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Dirk Baabe
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Matthias Freytag
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Peter G. Jones
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
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25
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Yoshimura A, Yusubov MS, Zhdankin VV. Synthetic applications of pseudocyclic hypervalent iodine compounds. Org Biomol Chem 2016; 14:4771-81. [DOI: 10.1039/c6ob00773b] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
In this review the preparation and structural features of pseudocyclic iodine(iii) and iodine(v) derivatives are discussed, and recent developments in their synthetic applications are summarized.
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Affiliation(s)
- Akira Yoshimura
- Department of Chemistry and Biochemistry
- University of Minnesota Duluth
- Duluth
- USA
| | | | - Viktor V. Zhdankin
- Department of Chemistry and Biochemistry
- University of Minnesota Duluth
- Duluth
- USA
- The Tomsk Polytechnic University
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26
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Jess K, Baabe D, Bannenberg T, Brandhorst K, Freytag M, Jones PG, Tamm M. Ni–Fe and Pd–Fe Interactions in Nickel(II) and Palladium(II) Complexes of a Ferrocene-Bridged Bis(imidazolin-2-imine) Ligand. Inorg Chem 2015; 54:12032-45. [DOI: 10.1021/acs.inorgchem.5b02457] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Kristof Jess
- Institut für Anorganische
und Analytische Chemie Technische, Universität Braunschweig, Hagenring
30, 38106 Braunschweig, Germany
| | - Dirk Baabe
- Institut für Anorganische
und Analytische Chemie Technische, Universität Braunschweig, Hagenring
30, 38106 Braunschweig, Germany
| | - Thomas Bannenberg
- Institut für Anorganische
und Analytische Chemie Technische, Universität Braunschweig, Hagenring
30, 38106 Braunschweig, Germany
| | - Kai Brandhorst
- Institut für Anorganische
und Analytische Chemie Technische, Universität Braunschweig, Hagenring
30, 38106 Braunschweig, Germany
| | - Matthias Freytag
- Institut für Anorganische
und Analytische Chemie Technische, Universität Braunschweig, Hagenring
30, 38106 Braunschweig, Germany
| | - Peter G. Jones
- Institut für Anorganische
und Analytische Chemie Technische, Universität Braunschweig, Hagenring
30, 38106 Braunschweig, Germany
| | - Matthias Tamm
- Institut für Anorganische
und Analytische Chemie Technische, Universität Braunschweig, Hagenring
30, 38106 Braunschweig, Germany
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27
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Glöge T, Aal F, Filimon SA, Jones PG, Michaelis de Vasconcellos J, Herres-Pawlis S, Tamm M. Transition Metal Complexes ContainingC2-Symmetric Bis(imidazolin-2-imine) Ligands Derived from a 1-Alkyl-3-arylimidazolin-2-ylidene. Z Anorg Allg Chem 2015. [DOI: 10.1002/zaac.201500569] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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