1
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Porte V, Milunovic MNM, Knof U, Leischner T, Danzl T, Kaiser D, Gruene T, Zalibera M, Jelemenska I, Bucinsky L, Jannuzzi SAV, DeBeer S, Novitchi G, Maulide N, Arion VB. Chemical and Redox Noninnocence of Pentane-2,4-dione Bis( S-methylisothiosemicarbazone) in Cobalt Complexes and Their Application in Wacker-Type Oxidation. JACS AU 2024; 4:1166-1183. [PMID: 38559722 PMCID: PMC10976605 DOI: 10.1021/jacsau.4c00005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 02/09/2024] [Accepted: 02/15/2024] [Indexed: 04/04/2024]
Abstract
Cobalt complexes with multiproton- and multielectron-responsive ligands are of interest for challenging catalytic transformations. The chemical and redox noninnocence of pentane-2,4-dione bis(S-methylisothiosemicarbazone) (PBIT) in a series of cobalt complexes has been studied by a range of methods, including spectroscopy [UV-vis, NMR, electron paramagnetic resonance (EPR), X-ray absorption spectroscopy (XAS)], cyclic voltammetry, X-ray diffraction, and density functional theory (DFT) calculations. Two complexes [CoIII(H2LSMe)I]I and [CoIII(LSMe)I2] were found to act as precatalysts in a Wacker-type oxidation of olefins using phenylsilane, the role of which was elucidated through isotopic labeling. Insights into the mechanism of the catalytic transformation as well as the substrate scope of this selective reaction are described, and the essential role of phenylsilane and the noninnocence of PBIT are disclosed. Among the several relevant species characterized was an unprecedented Co(III) complex with a dianionic diradical PBIT ligand ([CoIII(LSMe••)I]).
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Affiliation(s)
- Vincent Porte
- University
of Vienna, Institute of Organic Chemistry, Währinger Strasse 38, A-1090 Vienna, Austria
| | - Miljan N. M. Milunovic
- University
of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42, A-1090 Vienna, Austria
| | - Ulrich Knof
- Novartis
Pharma AG, CH-4056 Basel, Switzerland
| | - Thomas Leischner
- University
of Vienna, Institute of Organic Chemistry, Währinger Strasse 38, A-1090 Vienna, Austria
| | - Tobias Danzl
- University
of Vienna, Institute of Organic Chemistry, Währinger Strasse 38, A-1090 Vienna, Austria
| | - Daniel Kaiser
- University
of Vienna, Institute of Organic Chemistry, Währinger Strasse 38, A-1090 Vienna, Austria
| | - Tim Gruene
- University
of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42, A-1090 Vienna, Austria
| | - Michal Zalibera
- Institute
of Physical Chemistry and Chemical Physics, Faculty of Chemical and
Food Technology, Slovak University of Technology
in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Ingrid Jelemenska
- Institute
of Physical Chemistry and Chemical Physics, Faculty of Chemical and
Food Technology, Slovak University of Technology
in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Lukas Bucinsky
- Institute
of Physical Chemistry and Chemical Physics, Faculty of Chemical and
Food Technology, Slovak University of Technology
in Bratislava, Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Sergio A. V. Jannuzzi
- Max
Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Serena DeBeer
- Max
Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | | | - Nuno Maulide
- University
of Vienna, Institute of Organic Chemistry, Währinger Strasse 38, A-1090 Vienna, Austria
| | - Vladimir B. Arion
- University
of Vienna, Institute of Inorganic Chemistry, Währinger Strasse 42, A-1090 Vienna, Austria
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2
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Czaikowski ME, Anferov SW, Tascher AP, Anderson JS. Electrocatalytic Semihydrogenation of Terminal Alkynes Using Ligand-Based Transfer of Protons and Electrons. J Am Chem Soc 2024; 146:476-486. [PMID: 38163759 DOI: 10.1021/jacs.3c09885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Alkyne semihydrogenation is a broadly important transformation in chemical synthesis. Here, we introduce an electrochemical method for the selective semihydrogenation of terminal alkynes using a dihydrazonopyrrole Ni complex capable of storing an H2 equivalent (2H+ + 2e-) on the ligand backbone. This method is chemoselective for the semihydrogenation of terminal alkynes over internal alkynes or alkenes. Mechanistic studies reveal that the transformation is concerted and Z-selective. Calculations support a ligand-based hydrogen-atom transfer pathway instead of a hydride mechanism, which is commonly invoked for transition metal hydrogenation catalysts. The synthesis of the proposed intermediates demonstrates that the catalytic mechanism proceeds through a reduced formal Ni(I) species. The high yields for terminal alkene products without over-reduction or oligomerization are among the best reported for any homogeneous catalyst. Furthermore, the metal-ligand cooperative hydrogen transfer enabled with this system directs the efficient flow of H atom equivalents toward alkyne reduction rather than hydrogen evolution, providing a blueprint for applying similar strategies toward a wide range of electroreductive transformations.
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Affiliation(s)
- Maia E Czaikowski
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Sophie W Anferov
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Alex P Tascher
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - John S Anderson
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
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3
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Wicker SA, Hutchison P, Musicante RG, Kiker MT, Suffern NC, Graham DK, Rhodes LM, Binu AP, Jean-Francois SA, Graves AS, Brennessel WW, Eckenhoff WT. Hydrogen Production Using a Nickel Catalyst Combining Redox Activity and Pendent Base Effects. Inorg Chem 2024; 63:451-461. [PMID: 38113512 DOI: 10.1021/acs.inorgchem.3c03308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
With the mounting need for clean and renewable energy, catalysts for hydrogen production based on earth abundant elements are of great interest. Herein, we describe the synthesis, characterization, and catalytic activity of two nickel complexes based on the pyridinediimine ligand that possess basic nitrogen moieties of pyridine and imidazole that could potentially serve as pendent bases to enhance catalysis. Although these ligands have previously been reported to be complexed to some metal ions, they have not been applied to nickel. The nickel complex with the pendent pyridines was found to be the most active of the two, catalyzing proton reduction electrochemically with an overpotential of 490 mV. The appearance of a wave that preceded the Ni(I/0) redox couple in the presence of protons suggests that protonation of a dissociated pyridine was likely. Further evidence of this was provided with density functional theory calculations, and a mechanism of hydrogen production is proposed. Furthermore, in a light-driven system containing Ru(bpy)32+ and ascorbic acid, TON of 1400 were obtained.
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Affiliation(s)
- Scott A Wicker
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Phillips Hutchison
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Robert G Musicante
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Meghan T Kiker
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Nicholas C Suffern
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Daniel K Graham
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Liam M Rhodes
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Aby P Binu
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Stephan A Jean-Francois
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - Alex S Graves
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
| | - William W Brennessel
- Department of Chemistry, University of Rochester, 120 Trustee Road, Rochester, New York 14627, United States
| | - William T Eckenhoff
- Department of Chemistry, Rhodes College, 2000 N. Parkway, Memphis, Tennessee 38112, United States
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4
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Krämer F, Paradies J, Fernández I, Breher F. A crystalline aluminium-carbon-based ambiphile capable of activation and catalytic transfer of ammonia in non-aqueous media. Nat Chem 2024; 16:63-69. [PMID: 37770550 DOI: 10.1038/s41557-023-01340-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 08/31/2023] [Indexed: 09/30/2023]
Abstract
Despite recent achievements in the field of frustrated Lewis pairs (FLPs) for small molecule activations, the reversible activation and catalytic transformations of N-H-activated ammonia remain a challenge. Here we report on a rare combination of an aluminium Lewis acid and a carbon Lewis base. A so-called hidden FLP consisting of a phosphorus ylide featuring an aluminium fragment in the ortho position of a phenyl ring scaffold is introduced. Although the formation of the Lewis acid/base adduct is observed in the solid state, which at first glance leads to formally quenched FLP reactivity, we show that the title compound readily reacts with non-aqueous ammonia thermoneutrally and splits the N-H bond reversibly at ambient temperature. In addition, NH3 transfer reactions mediated by a main-group catalyst are presented. This proof-of-principle study is expected to initiate further activities in utilizing N-H-activated ammonia as a readily available, atom-economical nitrogen source.
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Affiliation(s)
- Felix Krämer
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Jan Paradies
- Chemistry Department, Paderborn University, Paderborn, Germany
| | - Israel Fernández
- Departamento de Química Orgánica I, Facultad de Ciencias Químicas and Centro de Innovación en Química Avanzada, Universidad Complutense de Madrid, Madrid, Spain
| | - Frank Breher
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany.
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5
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Auer M, Bolten J, Eichele K, Schubert H, Sindlinger CP, Wesemann L. Heavy metalla vinyl-cations show metal-Lewis acid cooperativity in reaction with small molecules (NH 3, N 2H 4, H 2O, H 2). Chem Sci 2023; 14:514-524. [PMID: 36741530 PMCID: PMC9847682 DOI: 10.1039/d2sc05620h] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 11/24/2022] [Indexed: 11/25/2022] Open
Abstract
Halide abstraction from tetrylidene complexes [TbbE(Br)IrH(PMe3)3] [E = Ge (1), Sn (2)] and [Ar*E(Cl)IrH(PMe3)3] gives the salts [TbbEIrH(PMe3)3][BArF 4] [E = Ge (3), Sn (4)] and [Ar*EIrH(PMe3)3][BArF 4] [E = Ge (3'), E = Sn (4')] (Tbb = 2,6-[CH(SiMe3)2]2-4-(t-Bu)C6H2, Ar* = 2,6-Trip2C6H3, Trip = 2,4,6-triisopropylphenyl). Bonding analysis suggests their most suitable description as metalla-tetrela vinyl cations with an Ir[double bond, length as m-dash]E double bond and a near linear coordination at the Ge/Sn atoms. Cationic complexes 3 and 4 oxidatively add NH3, N2H4, H2O, HCl, and H2 selectively to give: [TbbGe(NH2)IrH2(PMe3)3][BArF 4] (5), [TbbE(NHNH2)IrH2(PMe3)3][BArF 4] [E = Ge (7), Sn (8)], [TbbE(OH)IrH2(PMe3)3][BArF 4] [E = Ge (9), Sn (10)], [TbbE(Cl)IrH2(PMe3)3][BArF 4] [E = Ge (11a), Sn (12a)], [TbbGe(H)IrH2(PMe3)3][BArF 4] (13), [TbbSn(μ-H3)Ir(PMe3)3][BArF 4] (14), and [TbbSn(H)IrH2(PMe3)3][BArF 4] (15). 14 isomerizes to give 15via an 1,2-H shift reaction. Hydride addition to cation 3 gives a mixture of products [TbbGeHIrH(PMe3)3] (16) and [TbbGeIrH2(PMe3)3] (17) and a reversible 1,2-H shift between 16 and 17 was studied. In the tin case 4 the dihydride [TbbSnIrH2(PMe3)3] (18) was isolated exclusively. The PMe3 and PEt3 derivatives, 18 and [TbbSnIrH2(PEt3)3] (19), respectively, could also be synthesized in reaction of [TbbSnH2]- with the respective chloride [(R3P) n IrCl] (R = Me, n = 4; R = Et, n = 3). Reaction of complex 19 with CO gives the substitution product [TbbSnIrH2(CO)(PEt3)2] (20). Further reaction with CO results in hydrogen transfer from the iridium to the tin atom to give [TbbSnH2Ir(CO)2(PEt3)2] (21). The reversibility of this ligand induced reductive elimination transferring 20 to 21 is shown.
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Affiliation(s)
- Maximilian Auer
- Institut für Anorganische ChemieAuf der Morgenstelle 1872076 TübingenGermany
| | - Janina Bolten
- Institut für Anorganische ChemieAuf der Morgenstelle 1872076 TübingenGermany
| | - Klaus Eichele
- Institut für Anorganische ChemieAuf der Morgenstelle 1872076 TübingenGermany
| | - Hartmut Schubert
- Institut für Anorganische ChemieAuf der Morgenstelle 1872076 TübingenGermany
| | - Christian P. Sindlinger
- Institut für Anorganische Chemie, Universität StuttgartPfaffenwaldring 5570569 StuttgartGermany
| | - Lars Wesemann
- Institut für Anorganische ChemieAuf der Morgenstelle 1872076 TübingenGermany
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6
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Bora D, Gayen FR, Saha B. Ammonia from dinitrogen at ambient conditions by organometallic catalysts. RSC Adv 2022; 12:33567-33583. [PMID: 36505716 PMCID: PMC9682445 DOI: 10.1039/d2ra06156b] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 11/15/2022] [Indexed: 11/24/2022] Open
Abstract
Fixation of atmospheric dinitrogen in plants by [Mo-Fe] cofactor of nitrogenase enzyme takes place efficiently under atmospheric pressure and normal temperature. In search for an alternative methodology for the highly energy intensive Haber-Bosch process, design and synthesis of highly efficient inorganic and organometallic complexes by mimicking the structure and function of [Mo-Fe] cofactor system is highly desirable for ammonia synthesis from dinitrogen. An ideal catalyst for ammonia synthesis should effectively catalyse the reduction of dinitrogen in the presence of a proton source under mild to moderate conditions, and thereby, significantly reducing the cost of ammonia production and increasing the energy efficacy of the process. In the light of current research, it is evident that there is a plenty of scope for the development and enhanced performance of the inorganic and organometallic catalysts for ammonia synthesis under ambient temperature and pressure. The review furnishes a comprehensive outlook of numerous organometallic catalysts used in the synthesis of ammonia from dinitrogen in the past few decades.
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Affiliation(s)
- Debashree Bora
- Advanced Materials Group, Materials Sciences and Technology Division, CSIR-North East Institute of Science and TechnologyJorhatAssam-785006India,Academy of Scientific and Innovative Research (AcSIR)Ghaziabad-201002India
| | - Firdaus Rahaman Gayen
- Advanced Materials Group, Materials Sciences and Technology Division, CSIR-North East Institute of Science and TechnologyJorhatAssam-785006India,Academy of Scientific and Innovative Research (AcSIR)Ghaziabad-201002India
| | - Biswajit Saha
- Advanced Materials Group, Materials Sciences and Technology Division, CSIR-North East Institute of Science and TechnologyJorhatAssam-785006India,Academy of Scientific and Innovative Research (AcSIR)Ghaziabad-201002India
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7
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Yang X, Reijerse EJ, Bhattacharyya K, Leutzsch M, Kochius M, Nöthling N, Busch J, Schnegg A, Auer AA, Cornella J. Radical Activation of N-H and O-H Bonds at Bismuth(II). J Am Chem Soc 2022; 144:16535-16544. [PMID: 36053726 PMCID: PMC9479083 DOI: 10.1021/jacs.2c05882] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The development of unconventional strategies for the activation of ammonia (NH3) and water (H2O) is of capital importance for the advancement of sustainable chemical strategies. Herein we provide the synthesis and characterization of a radical equilibrium complex based on bismuth featuring an extremely weak Bi-O bond, which permits the in situ generation of reactive Bi(II) species. The ensuing organobismuth(II) engages with various amines and alcohols and exerts an unprecedented effect onto the X-H bond, leading to low BDFEX-H. As a result, radical activation of various N-H and O-H bonds─including ammonia and water─occurs in seconds at room temperature, delivering well-defined Bi(III)-amido and -alkoxy complexes. Moreover, we demonstrate that the resulting Bi(III)-N complexes engage in a unique reactivity pattern with the triad of H+, H-, and H• sources, thus providing alternative pathways for main group chemistry.
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Affiliation(s)
- Xiuxiu Yang
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Edward J Reijerse
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | | | - Markus Leutzsch
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Markus Kochius
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Nils Nöthling
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Julia Busch
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Alexander Schnegg
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Alexander A Auer
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Josep Cornella
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
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8
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Wang Y, Tran PM, Lahm ME, Xie Y, Wei P, Adams ER, Glushka JN, Ren Z, Popik VV, Schaefer HF, Robinson GH. Activation of Ammonia by a Carbene-Stabilized Dithiolene Zwitterion. J Am Chem Soc 2022; 144:16325-16331. [PMID: 36037279 DOI: 10.1021/jacs.2c07920] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A carbene-stabilized dithiolene zwitterion (3) activates ammonia, affording 4• and 5, through both single-electron transfer (SET) and hydrogen atom transfer (HAT). Reaction products were characterized spectroscopically and by single-crystal X-ray diffraction. The mechanism of the formation of 4• and 5 was probed by experimental and computational methods. This discovery is the first example of metal-free ammonia activation via HAT.
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Affiliation(s)
- Yuzhong Wang
- Department of Chemistry, Center for Computational Chemistry, and Complex Carbohydrate Research Center, The University of Georgia, Athens, Georgia 30602-2556, United States
| | - Phuong M Tran
- Department of Chemistry, Center for Computational Chemistry, and Complex Carbohydrate Research Center, The University of Georgia, Athens, Georgia 30602-2556, United States
| | - Mitchell E Lahm
- Department of Chemistry, Center for Computational Chemistry, and Complex Carbohydrate Research Center, The University of Georgia, Athens, Georgia 30602-2556, United States
| | - Yaoming Xie
- Department of Chemistry, Center for Computational Chemistry, and Complex Carbohydrate Research Center, The University of Georgia, Athens, Georgia 30602-2556, United States
| | - Pingrong Wei
- Department of Chemistry, Center for Computational Chemistry, and Complex Carbohydrate Research Center, The University of Georgia, Athens, Georgia 30602-2556, United States
| | - Earle R Adams
- Department of Chemistry, Center for Computational Chemistry, and Complex Carbohydrate Research Center, The University of Georgia, Athens, Georgia 30602-2556, United States
| | - John N Glushka
- Department of Chemistry, Center for Computational Chemistry, and Complex Carbohydrate Research Center, The University of Georgia, Athens, Georgia 30602-2556, United States
| | - Zichun Ren
- Department of Chemistry, Center for Computational Chemistry, and Complex Carbohydrate Research Center, The University of Georgia, Athens, Georgia 30602-2556, United States
| | - Vladimir V Popik
- Department of Chemistry, Center for Computational Chemistry, and Complex Carbohydrate Research Center, The University of Georgia, Athens, Georgia 30602-2556, United States
| | - Henry F Schaefer
- Department of Chemistry, Center for Computational Chemistry, and Complex Carbohydrate Research Center, The University of Georgia, Athens, Georgia 30602-2556, United States
| | - Gregory H Robinson
- Department of Chemistry, Center for Computational Chemistry, and Complex Carbohydrate Research Center, The University of Georgia, Athens, Georgia 30602-2556, United States
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9
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Anferov SW, Filatov AS, Anderson JS. Cobalt-Catalyzed Hydrogenation Reactions Enabled by Ligand-Based Storage of Dihydrogen. ACS Catal 2022; 12:9933-9943. [PMID: 36033368 PMCID: PMC9396622 DOI: 10.1021/acscatal.2c02467] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 07/18/2022] [Indexed: 12/18/2022]
Abstract
The use of supporting ligands that can store either protons or electrons has emerged as a powerful strategy in catalysis. While these strategies are potent individually, natural systems mediate remarkable transformations by combining the storage of both protons and electrons in the secondary coordination sphere. As such, there has been recent interest in using this strategy to enable fundamentally different transformations. Furthermore, outsourcing H-atom or hydrogen storage to ancillary ligands can also enable alternative mechanistic pathways and thereby selectivity. Here, we describe the application of this strategy to facilitate radical reactivity in Co-based hydrogenation catalysis. Metalation of previously reported dihydrazonopyrrole ligands with Co results in paramagnetic complexes, which are best described as having Co(II) oxidation states. These complexes catalytically hydrogenate olefins with low catalyst loadings under mild conditions (1 atm H2, 23 °C). Mechanistic, spectroscopic, and computational investigations indicate that this system goes through a radical hydrogen-atom transfer (HAT) type pathway that is distinct from classic organometallic mechanisms and is supported by the ability of the ligand to store H2. These results show how ancillary ligands can facilitate efficient catalysis, and furthermore how classic organometallic mechanisms for catalysis can be altered by the secondary coordination sphere.
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Affiliation(s)
- Sophie W Anferov
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60627, United States
| | - Alexander S Filatov
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60627, United States
| | - John S Anderson
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60627, United States
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10
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Abstract
Coordination-induced bond weakening is a phenomenon wherein ligand X-H bond homolysis occurs in concert with the energetically favorable oxidation of a coordinating metal complex. The coupling of these two processes enables thermodynamically favorable proton-coupled electron transfer reductions to form weak bonds upon formal hydrogen atom transfer to substrates. Moreover, systems utilizing coordination-induced bond weakening have been shown to facilitate the dehydrogenation of feedstock molecules including water, ammonia, and primary alcohols under mild conditions. The formation of exceptionally weak substrate X-H bonds via small molecule homolysis is a powerful strategy in synthesis and has been shown to enable nitrogen fixation under mild conditions. Coordination-induced bond weakening has also been identified as an integral process in biophotosynthesis and has promising applications in renewable chemical fuel storage systems. This review presents a discussion of the advances made in the study of coordination-induced bond weakening to date. Because of the broad range of metal and ligand species implicated in coordination-induced bond weakening, each literature report is discussed individually and ordered by the identity of the low-valent metal. We then offer mechanistic insights into the basis of coordination-induced bond weakening and conclude with a discussion of opportunities for further research into the development and applications of coordination-induced bond weakening systems.
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Affiliation(s)
- Nicholas G Boekell
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - Robert A Flowers
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States
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11
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Su L, Yang D, Jiang Y, Li Y, Di K, Wang B, Ye S, Qu J. A Bioinspired Iron‐Molybdenum μ‐Nitrido Complex and Its Reactivity toward Ammonia Formation. Angew Chem Int Ed Engl 2022; 61:e202203121. [DOI: 10.1002/anie.202203121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Linan Su
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Dawei Yang
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Yang Jiang
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116024 China
| | - Yahui Li
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Kai Di
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Baomin Wang
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Shengfa Ye
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116024 China
| | - Jingping Qu
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
- State Key Laboratory of Bioreactor Engineering Shanghai Collaborative Innovation Centre for Biomanufacturing Frontiers Science Center for Materiobiology and Dynamic Chemistry East China University of Science and Technology 130 Meilong Road Shanghai 200237 China
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12
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Riffel MN, Siegel L, Oliver AG, Tsui EY. Cluster self-assembly and anion binding by metal complexes of non-innocent thiazolidinyl-thiolate ligands. Dalton Trans 2022; 51:9611-9615. [PMID: 35695261 DOI: 10.1039/d2dt01339h] [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
ZnII and FeII chloride complexes of a di(methylthiazolidinyl)pyridine ligand were deprotonated to form the corresponding thiolate complexes supported by redox-active iminopyridine moieties. The thiolate donor groups are nucleophilic and reactive toward oxidants, electrophiles, and protons, while the pendant thiazolidine rings are available for hydrogen bonding. Anion exchange with the weakly-coordinating triflate anion resulted in self-assembly of the iminopyridine complexes to form a trimeric [M3S3] cluster. Hydrogen bonding closely associates anions with this trimetallic core.
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Affiliation(s)
- Madeline N Riffel
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA.
| | - Lukas Siegel
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA. .,Department of Chemistry, Heidelberg University, Heidelberg, Germany
| | - Allen G Oliver
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA.
| | - Emily Y Tsui
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN, USA.
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13
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Su L, Yang D, Jiang Y, Li Y, Di K, Wang B, Ye S, Qu J. A Bioinspired Iron‐Molybdenum μ‐Nitrido Complex and Its Reactivity toward Ammonia Formation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Linan Su
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Dawei Yang
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Yang Jiang
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116024 China
| | - Yahui Li
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Kai Di
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Baomin Wang
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
| | - Shengfa Ye
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116024 China
| | - Jingping Qu
- State Key Laboratory of Fine Chemicals Dalian University of Technology 2 Linggong Road Dalian 116024 China
- State Key Laboratory of Bioreactor Engineering Shanghai Collaborative Innovation Centre for Biomanufacturing Frontiers Science Center for Materiobiology and Dynamic Chemistry East China University of Science and Technology 130 Meilong Road Shanghai 200237 China
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14
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Mou LH, Li ZY, He SG. Recent Progress in Dinitrogen Activation by Gas-Phase Metal Species. J Phys Chem Lett 2022; 13:4159-4169. [PMID: 35507918 DOI: 10.1021/acs.jpclett.2c00850] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Understanding the mechanisms to activate and functionalize dinitrogen (N2) is of great importance for the rational design of nitrogen-fixation catalysts. Reactions of gas-phase species with N2 are being actively studied to understand the bond activation and formation processes at a strictly molecular level. This Perspective provides an overview of the recent progress in combined experimental and theoretical studies on the activation and functionalization of N2 by gas-phase metal species. New mechanistic insights into N2 molecular adsorption, N≡N cleavage, and N-X (X = C, B, and H) formation have been introduced, in which the new reaction channels of ejecting neutral metal fragments and the coupling reactions of N2 with other molecules are highlighted. Finally, the current challenges and outlooks of N2 activation in the gas phase are discussed as well.
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Affiliation(s)
- Li-Hui Mou
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P.R. China
- University of Chinese Academy of Sciences, Beijing 100049, P.R. China
- Beijing National Laboratory for Molecular Sciences and CAS Research/Education Center of Excellence in Molecular Sciences, Beijing 100190, P.R. China
| | - Zi-Yu Li
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P.R. China
- Beijing National Laboratory for Molecular Sciences and CAS Research/Education Center of Excellence in Molecular Sciences, Beijing 100190, P.R. China
| | - Sheng-Gui He
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P.R. China
- University of Chinese Academy of Sciences, Beijing 100049, P.R. China
- Beijing National Laboratory for Molecular Sciences and CAS Research/Education Center of Excellence in Molecular Sciences, Beijing 100190, P.R. China
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15
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Connor GP, Delony D, Weber JE, Mercado BQ, Curley JB, Schneider S, Mayer JM, Holland PL. Facile conversion of ammonia to a nitride in a rhenium system that cleaves dinitrogen. Chem Sci 2022; 13:4010-4018. [PMID: 35440977 PMCID: PMC8985503 DOI: 10.1039/d1sc04503b] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Accepted: 02/22/2022] [Indexed: 11/21/2022] Open
Abstract
Rhenium complexes with aliphatic PNP pincer ligands have been shown to be capable of reductive N2 splitting to nitride complexes. However, the conversion of the resulting nitride to ammonia has not been observed. Here, the thermodynamics and mechanism of the hypothetical N–H bond forming steps are evaluated through the reverse reaction, conversion of ammonia to the nitride complex. Depending on the conditions, treatment of a rhenium(iii) precursor with ammonia gives either a bis(amine) complex [(PNP)Re(NH2)2Cl]+, or results in dehydrohalogenation to the rhenium(iii) amido complex, (PNP)Re(NH2)Cl. The N–H hydrogen atoms in this amido complex can be abstracted by PCET reagents which implies that they are quite weak. Calorimetric measurements show that the average bond dissociation enthalpy of the two amido N–H bonds is 57 kcal mol−1, while DFT computations indicate a substantially weaker N–H bond of the putative rhenium(iv)-imide intermediate (BDE = 38 kcal mol−1). Our analysis demonstrates that addition of the first H atom to the nitride complex is a thermochemical bottleneck for NH3 generation. Rhenium–PNP complexes split N2 to nitrides, but the nitrides do not give ammonia. Here, the thermodynamics of the hypothetical N–H bond forming steps are evaluated through the reverse reaction, showing that the first H addition is the bottleneck.![]()
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Affiliation(s)
- Gannon P Connor
- Department of Chemistry, Yale University New Haven Connecticut USA
| | - Daniel Delony
- Institute of Inorganic Chemistry, Georg-August-Universität Göttingen Göttingen Germany
| | - Jeremy E Weber
- Department of Chemistry, Yale University New Haven Connecticut USA
| | | | - Julia B Curley
- Department of Chemistry, Yale University New Haven Connecticut USA
| | - Sven Schneider
- Institute of Inorganic Chemistry, Georg-August-Universität Göttingen Göttingen Germany
| | - James M Mayer
- Department of Chemistry, Yale University New Haven Connecticut USA
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16
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Li Y, Chen JY, Miao Q, Yu X, Feng L, Liao RZ, Ye S, Tung CH, Wang W. A Parent Iron Amido Complex in Catalysis of Ammonia Oxidation. J Am Chem Soc 2022; 144:4365-4375. [PMID: 35234468 DOI: 10.1021/jacs.1c08609] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Parent amido complexes are crucial intermediates in ammonia-based transformations. We report a well-defined ferric ammine system [Cp*Fe(1,2-Ph2PC6H4NH)(NH3)]+ ([1-NH3]+), which processes electrocatalytic ammonia oxidation to N2 and H2 at a mild potential. Through establishing elementary e-/H+ conversions with the ferric ammine, a formal Fe(IV)-amido species, [1-NH2]+, together with its conjugated Lewis acid, [1-NH3]2+, was isolated and structurally characterized for the first time. Mechanism studies indicated that further oxidation of [1-NH2]+ induces the reaction of the parent amido unit with NH3. The formation of hydrazine is realized by the non-innocent nature of the phenylamido ligand that facilitates the concerted transfer of one proton and two electrons.
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Affiliation(s)
- Yongxian Li
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Jia-Yi Chen
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Qiyi Miao
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xin Yu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Lei Feng
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Rong-Zhen Liao
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Shengfa Ye
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.,Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim an der Ruhr, Germany
| | - Chen-Ho Tung
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Wenguang Wang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.,College of Chemistry, Beijing Normal University, Beijing 100875, China
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17
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Vosough M, Khayati GR, Sharafi S. Ammonia leaching of MoO3 concentrate: finding the reaction mechanism and kinetics analysis. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02098-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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18
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Synthesis, electronic structures, and reactivity of mononuclear and dinuclear low-valent molybdenum complexes in iminopyridine and bis(imino)pyridine ligand environments. J Inorg Biochem 2022; 230:111744. [DOI: 10.1016/j.jinorgbio.2022.111744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 01/18/2022] [Accepted: 01/22/2022] [Indexed: 11/22/2022]
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19
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McOnie SL, Özpınar GA, Bourque JL, Müller T, Baines KM. NH bond activation of ammonia and amines by ditetrelenes: key insights into the stereochemistry of nucleophilic addition. Dalton Trans 2021; 50:17734-17750. [PMID: 34812813 DOI: 10.1039/d1dt03739k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The NH bond activation of ammonia, primary and secondary amines by tetramesityldisilene and -digermene was investigated. In each case, a disilyl- or digermylamine was formed as the only product of amine addition. The mechanism of the addition of ammonia to tetramesityldisilene was computed and revealed a three-step reaction pathway: formation of the anti-ammonia-disilene adduct, inversion at the β-silicon, and syn-transfer of the proton to give the syn-product, where each step follows a distinct stereochemical course. Examination of the reaction landscape also revealed several additional insights: (a) that, in the initial step, the formation of the anti-oriented zwitterionic intermediate is kinetically more preferable than formation of the syn-oriented zwitterionic intermediate, (b) that intermolecular transfer of a proton is not energetically feasible in non-polar solvents, and (c) that the bulk of the substituents can have a profound effect on the stereochemical course of the reaction. With this detailed understanding, nucleophilic additions to ditetrelenes can be exploited in the future.
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Affiliation(s)
- Sarah L McOnie
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7.
| | - Gül Altınbaş Özpınar
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26129 Oldenburg, Federal Republic of Germany, European Union.
| | - Jeremy L Bourque
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7.
| | - Thomas Müller
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26129 Oldenburg, Federal Republic of Germany, European Union.
| | - Kim M Baines
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7.
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20
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Thenarukandiyil R, Paenurk E, Wong A, Fridman N, Karton A, Carmieli R, Ménard G, Gershoni-Poranne R, de Ruiter G. Extensive Redox Non-Innocence in Iron Bipyridine-Diimine Complexes: a Combined Spectroscopic and Computational Study. Inorg Chem 2021; 60:18296-18306. [PMID: 34787414 PMCID: PMC8653161 DOI: 10.1021/acs.inorgchem.1c02925] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Indexed: 11/28/2022]
Abstract
Metal-ligand cooperation is an important aspect in earth-abundant metal catalysis. Utilizing ligands as electron reservoirs to supplement the redox chemistry of the metal has resulted in many new exciting discoveries. Here, we demonstrate that iron bipyridine-diimine (BDI) complexes exhibit an extensive electron-transfer series that spans a total of five oxidation states, ranging from the trication [Fe(BDI)]3+ to the monoanion [Fe(BDI]-1. Structural characterization by X-ray crystallography revealed the multifaceted redox noninnocence of the BDI ligand, while spectroscopic (e.g., 57Fe Mössbauer and EPR spectroscopy) and computational studies were employed to elucidate the electronic structure of the isolated complexes, which are further discussed in this report.
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Affiliation(s)
- Ranjeesh Thenarukandiyil
- Schulich
Faculty of Chemistry, Technion −
Israel Institute of Technology, Technion City, 3200008 Haifa, Israel
| | - Eno Paenurk
- Laboratorium
für Organische Chemie, ETH Zurich, Vladimir-Prelog-Weg 2, Zurich 8093, Switzerland
| | - Anthony Wong
- Department
of Chemistry and Biochemistry, University
of California, Santa
Barbara, California 93106, United States
| | - Natalia Fridman
- Schulich
Faculty of Chemistry, Technion −
Israel Institute of Technology, Technion City, 3200008 Haifa, Israel
| | - Amir Karton
- School
of Molecular Science, The University of
Western Australia, 35 Stirling Highway, 6009 Perth, Australia
| | - Raanan Carmieli
- Department
of Chemical Research Support, Weizmann Institute
of Science, Rehovot 761000, Israel
| | - Gabriel Ménard
- Department
of Chemistry and Biochemistry, University
of California, Santa
Barbara, California 93106, United States
| | - Renana Gershoni-Poranne
- Schulich
Faculty of Chemistry, Technion −
Israel Institute of Technology, Technion City, 3200008 Haifa, Israel
- Laboratorium
für Organische Chemie, ETH Zurich, Vladimir-Prelog-Weg 2, Zurich 8093, Switzerland
| | - Graham de Ruiter
- Schulich
Faculty of Chemistry, Technion −
Israel Institute of Technology, Technion City, 3200008 Haifa, Israel
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21
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Jesse KA, Anferov SW, Collins KA, Valdez-Moreira JA, Czaikowski ME, Filatov AS, Anderson JS. Direct Aerobic Generation of a Ferric Hydroperoxo Intermediate Via a Preorganized Secondary Coordination Sphere. J Am Chem Soc 2021; 143:18121-18130. [PMID: 34698493 PMCID: PMC8569801 DOI: 10.1021/jacs.1c06911] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Indexed: 01/19/2023]
Abstract
Enzymes exert control over the reactivity of metal centers with precise tuning of the secondary coordination sphere of active sites. One particularly elegant illustration of this principle is in the controlled delivery of proton and electron equivalents in order to activate abundant but kinetically inert oxidants such as O2 for oxidative chemistry. Chemists have drawn inspiration from biology in designing molecular systems where the secondary coordination sphere can shuttle protons or electrons to substrates. However, a biomimetic activation of O2 requires the transfer of both protons and electrons, and molecular systems where ancillary ligands are designed to provide both of these equivalents are comparatively rare. Here, we report the use of a dihydrazonopyrrole (DHP) ligand complexed to Fe to perform exactly such a biomimetic activation of O2. In the presence of O2, this complex directly generates a high spin Fe(III)-hydroperoxo intermediate which features a DHP• ligand radical via ligand-based transfer of an H atom. This system displays oxidative reactivity and ultimately releases hydrogen peroxide, providing insight on how secondary coordination sphere interactions influence the evolution of oxidizing intermediates in Fe-mediated aerobic oxidations.
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Affiliation(s)
- Kate A. Jesse
- Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Sophie W. Anferov
- Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Kelsey A. Collins
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | | | - Maia E. Czaikowski
- Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Alexander S. Filatov
- Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - John S. Anderson
- Department
of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
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22
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Jesse KA, Chang M, Filatov AS, Anderson JS. Iron(II) Complexes Featuring a Redox‐Active Dihydrazonopyrrole Ligand. Z Anorg Allg Chem 2021; 647:1415-1420. [DOI: 10.1002/zaac.202100097] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Kate A. Jesse
- University of Chicago Department of Chemistry 929 E 57th St. Chicago IL 60637
| | - Mu‐Chieh Chang
- National Taiwan University Department of Chemistry No. 1, Section 4, Roosevelt Rd, Da'an District Taipei City Taiwan 10
| | | | - John S. Anderson
- University of Chicago Department of Chemistry 929 E 57th St. Chicago IL 60637
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23
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Forrest SJK, Schluschaß B, Yuzik-Klimova EY, Schneider S. Nitrogen Fixation via Splitting into Nitrido Complexes. Chem Rev 2021; 121:6522-6587. [DOI: 10.1021/acs.chemrev.0c00958] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sebastian J. K. Forrest
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Bastian Schluschaß
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
| | | | - Sven Schneider
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, D-37077 Göttingen, Germany
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24
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McNeece AJ, Jesse KA, Filatov AS, Schneider JE, Anderson JS. Catalytic hydrogenation enabled by ligand-based storage of hydrogen. Chem Commun (Camb) 2021; 57:3869-3872. [PMID: 33729221 PMCID: PMC8058320 DOI: 10.1039/d0cc08236h] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Biology employs exquisite control over proton, electron, H-atom, or H2 transfer. Similar control in synthetic systems has the potential to facilitate efficient and selective catalysis. Here we report a dihydrazonopyrrole Ni complex where an H2 equivalent can be stored on the ligand periphery without metal-based redox changes and can be leveraged for catalytic hydrogenations. Kinetic and computational analysis suggests ligand hydrogenation proceeds by H2 association followed by H-H scission. This complex is an unusual example where a synthetic system can mimic biology's ability to mediate H2 transfer via secondary coordination sphere-based processes.
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Affiliation(s)
- Andrew J McNeece
- Department of Chemistry, University of Chicago, 929 E 57th St., Chicago, IL 60637, USA.
| | - Kate A Jesse
- Department of Chemistry, University of Chicago, 929 E 57th St., Chicago, IL 60637, USA.
| | - Alexander S Filatov
- Department of Chemistry, University of Chicago, 929 E 57th St., Chicago, IL 60637, USA.
| | - Joseph E Schneider
- Department of Chemistry, University of Chicago, 929 E 57th St., Chicago, IL 60637, USA.
| | - John S Anderson
- Department of Chemistry, University of Chicago, 929 E 57th St., Chicago, IL 60637, USA.
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25
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Charette BJ, Ziller JW, Heyduk AF. Metal-Ion Influence on Ligand-Centered Hydrogen-Atom Transfer. Inorg Chem 2021; 60:1579-1589. [PMID: 33434022 DOI: 10.1021/acs.inorgchem.0c02981] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The ligand-centered hydrogen-atom-transfer (HAT) reactivity was examined for a family of group 10 metal complexes containing a tridentate pincer ligand derived from bis(2-mercapto-p-tolyl)amine, [SNS]H3. Six new metal complexes of palladium and platinum were synthesized with the [SNS] ligand platform in different redox and protonation states to complete the group 10 series previously reported with nickel. The HAT reactivity was examined for this family of nickel, palladium, and platinum complexes to determine the impact of a metal ion on the ligand-centered reactivity. Thermodynamic measurements revealed that N-H bond dissociation free energies increased by approximately 10 kcal mol-1 along the series Ni < Pd < Pt driven by changes to both the redox potential and pKa of the ligand. Kinetic analyses for all three metal complexes suggest that the barrier to the HAT reactivity is primarily entropic rather than enthalpic for this system.
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Affiliation(s)
- Bronte J Charette
- Department of Chemistry, University of California at Irvine (UCI), Irvine, California 92677-2025, United States
| | - Joseph W Ziller
- Department of Chemistry, University of California at Irvine (UCI), Irvine, California 92677-2025, United States
| | - Alan F Heyduk
- Department of Chemistry, University of California at Irvine (UCI), Irvine, California 92677-2025, United States
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26
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Hopkins Leseberg JA, Lionetti D, Day VW, Blakemore JD. Electrochemical Kinetic Study of [Cp*Rh] Complexes Supported by Bis(2-pyridyl)methane Ligands. Organometallics 2021. [DOI: 10.1021/acs.organomet.0c00747] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Julie A. Hopkins Leseberg
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Davide Lionetti
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Victor W. Day
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - James D. Blakemore
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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27
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Nurdin L, Yang Y, Neate PGN, Piers WE, Maron L, Neidig ML, Lin JB, Gelfand BS. Activation of ammonia and hydrazine by electron rich Fe(ii) complexes supported by a dianionic pentadentate ligand platform through a common terminal Fe(iii) amido intermediate. Chem Sci 2020; 12:2231-2241. [PMID: 34163989 PMCID: PMC8179247 DOI: 10.1039/d0sc06466a] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
We report the use of electron rich iron complexes supported by a dianionic diborate pentadentate ligand system, B2Pz4Py, for the coordination and activation of ammonia (NH3) and hydrazine (NH2NH2). For ammonia, coordination to neutral (B2Pz4Py)Fe(ii) or cationic [(B2Pz4Py)Fe(iii)]+ platforms leads to well characterized ammine complexes from which hydrogen atoms or protons can be removed to generate, fleetingly, a proposed (B2Pz4Py)Fe(iii)–NH2 complex (3Ar-NH2). DFT computations suggest a high degree of spin density on the amido ligand, giving it significant aminyl radical character. It rapidly traps the H atom abstracting agent 2,4,6-tri-tert-butylphenoxy radical (ArO˙) to form a C–N bond in a fully characterized product (2Ar), or scavenges hydrogen atoms to return to the ammonia complex (B2Pz4Py)Fe(ii)–NH3 (1Ar-NH3). Interestingly, when (B2Pz4Py)Fe(ii) is reacted with NH2NH2, a hydrazine bridged dimer, (B2Pz4Py)Fe(ii)–NH2NH2–Fe(ii)(B2Pz4Py) ((1Ar)2-NH2NH2), is observed at −78 °C and converts to a fully characterized bridging diazene complex, 4Ar, along with ammonia adduct 1Ar-NH3 as it is allowed to warm to room temperature. Experimental and computational evidence is presented to suggest that (B2Pz4Py)Fe(ii) induces reductive cleavage of the N–N bond in hydrazine to produce the Fe(iii)–NH2 complex 3Ar-NH2, which abstracts H˙ atoms from (1Ar)2-NH2NH2 to generate the observed products. All of these transformations are relevant to proposed steps in the ammonia oxidation reaction, an important process for the use of nitrogen-based fuels enabled by abundant first row transition metals. Synopsis: a highly reactive Fe(iii)–NH2 complex is generated via activation of ammonia or hydrazine in reactions of relevance to fundamental steps in ammonia oxidation processes mediated by an abundant, first row transition metal.![]()
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Affiliation(s)
- Lucie Nurdin
- Department of Chemistry, University of Calgary 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Yan Yang
- LPCNO, Université de Toulouse, INSA, UPS Toulouse France
| | - Peter G N Neate
- Department of Chemistry, University of Rochester Rochester New York 14627 USA
| | - Warren E Piers
- Department of Chemistry, University of Calgary 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Laurent Maron
- LPCNO, Université de Toulouse, INSA, UPS Toulouse France
| | - Michael L Neidig
- Department of Chemistry, University of Rochester Rochester New York 14627 USA
| | - Jian-Bin Lin
- Department of Chemistry, University of Calgary 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Benjamin S Gelfand
- Department of Chemistry, University of Calgary 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
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28
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Ríos P, Borge J, Fernández de Córdova F, Sciortino G, Lledós A, Rodríguez A. Ambiphilic boryl groups in a neutral Ni(ii) complex: a new activation mode of H 2. Chem Sci 2020; 12:2540-2548. [PMID: 34164022 PMCID: PMC8179274 DOI: 10.1039/d0sc06014c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The concept of metal–ligand cooperation opens new avenues for the design of catalytic systems that may offer alternative reactivity patterns to the existing ones. Investigations of this concept with ligands bearing a boron center in their skeleton established mechanistic pathways for the activation of small molecules in which the boron atom usually performs as an electrophile. Here, we show how this electrophilic behavior can be modified by the ligand trans to the boron center, evincing its ambiphilic nature. Treatment of diphosphinoboryl (PBP) nickel–methyl complex 1 with bis(catecholato)diboron (B2Cat2) allows for the synthesis of nickel(ii) bis-boryl complex 3 that promotes the clean and reversible heterolytic cleavage of dihydrogen leading to the formation of dihydroborate nickel complex 4. Density functional theory analysis of this reaction revealed that the heterolytic activation of H2 is facilitated by the cooperation of both boryl moieties and the metal atom in a concerted mechanism that involves a Ni(ii)/Ni(0)/Ni(ii) process. Contrary to 1, the boron atom from the PBP ligand in 3 behaves as a nucleophile, accepting a formally protic hydrogen, whereas the catecholboryl moiety acts as an electrophile, receiving the attack from the hydride-like fragment. This manifests the dramatic change in the electronic properties of a ligand by tuning the substituent trans to it and constitutes an unprecedented cooperative mechanism that involves two boryl ligands in the same molecule operating differently, one as a Lewis acid and the other one as a Lewis base, in cooperation with the metal. In addition, reactivity towards different nucleophiles such as amines or ammonia confirmed the electrophilic nature of the Bcat moiety, allowing the formation of aminoboranes. A bis(boryl)nickel complex promotes the facile and reversible activation of H2 through a cooperative mechanism that involves the metal and both boryl moieties in a concerted five-center process.![]()
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Affiliation(s)
- Pablo Ríos
- Instituto de Investigaciones Químicas, Departamento de Química Inorgánica, Universidad de Sevilla, Consejo Superior de Investigaciones Científicas, Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/Américo Vespucio 49 41092 Sevilla Spain
| | - Javier Borge
- Departamento de Química Física y Analítica, Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Oviedo C/Julián Clavería 8 33006 Oviedo Spain
| | - Francisco Fernández de Córdova
- Instituto de Investigaciones Químicas, Departamento de Química Inorgánica, Universidad de Sevilla, Consejo Superior de Investigaciones Científicas, Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/Américo Vespucio 49 41092 Sevilla Spain
| | - Giuseppe Sciortino
- Departament de Química, Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universitat Autònoma de Barcelona Campus UAB 08193 Cerdanyola del Vallès Spain
| | - Agustí Lledós
- Departament de Química, Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universitat Autònoma de Barcelona Campus UAB 08193 Cerdanyola del Vallès Spain
| | - Amor Rodríguez
- Instituto de Investigaciones Químicas, Departamento de Química Inorgánica, Universidad de Sevilla, Consejo Superior de Investigaciones Científicas, Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/Américo Vespucio 49 41092 Sevilla Spain
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29
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Margulieux GW, Kim S, Chirik PJ. Determination of the N-H Bond Dissociation Free Energy in a Pyridine(diimine)molybdenum Complex Prepared by Proton-Coupled Electron Transfer. Inorg Chem 2020; 59:15394-15401. [PMID: 33016073 DOI: 10.1021/acs.inorgchem.0c02382] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The pyridine(diimine)molybdenum bis(imido) complex (iPrPDI)Mo(═NTol)2 (Tol = 4-methylphenyl) was synthesized by the addition of 2 equiv of 4-methylphenylazide to the corresponding molybdenum benzene derivative, (iPrPDI)Mo(η6-C6H6) [iPrPDI = 2,6-(2,6-iPr2C6H3N═CMe)2C5H3N]. Protonation of (iPrPDI)Mo(═NTol)2 with 2,6-lutinidum triflate yielded a cationic molybdenum amido complex, [(iPrPDI)Mo(NHTol)(═NTol)][OTf], which was further transformed into the neutral molybdenum amido (iPrPDI)Mo(NHTol)(═NTol) by reduction with zinc powder. A series of spectroscopic, synthetic, and pKa determination studies along with electrochemical measurements by the protonation-reduction pathway were used to establish an N-H bond dissociation free energy (BDFE) between 65 and 69 kcal/mol for the molybdenum imido-amido compound, (iPrPDI)Mo(NHTol)(═NTol). Full-molecule density functional theory studies provided a computed value of 61 kcal/mol. By contrast, reduction of (iPrPDI)Mo(═NTol)2 with KC8 afforded the corresponding anionic molybdenum complex K[(iPrPDI)Mo(═NTol)2], which has a potassium cation intercalated with the pyridine and tolyl groups. Protonation of K[(iPrPDI)Mo(═NTol)2] with the weak amidinium acid [TBD(H)][BArF24] (TBD = triazabicyclodecene; BArF24 = B[3,5-(CF3)2C6H3]4) also produced the neutral molybdenum amido complex (iPrPDI)Mo(NHTol)(═NTol). Measurement of the pKa and oxidation potential of K[(iPrPDI)Mo(═NTol)2] provided a range of 69-73 kcal/mol for the N-H BDFE of (iPrPDI)Mo(NHTol)(═NTol), in good agreement with the protonation-reduction route and completing the square scheme. The similar pKa and redox potentials obtained from each pathway demonstrate that both sequences are energetically feasible for proton-coupled electron-transfer (PCET) events. This study on the determination of N-H BDFE of the molybdenum amido complex renders fundamental insight into the N2 reduction cycle by PCET.
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Affiliation(s)
- Grant W Margulieux
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Sangmin Kim
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Paul J Chirik
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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30
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Dunn PL, Cook BJ, Johnson SI, Appel AM, Bullock RM. Oxidation of Ammonia with Molecular Complexes. J Am Chem Soc 2020; 142:17845-17858. [PMID: 32977718 DOI: 10.1021/jacs.0c08269] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Oxidation of ammonia by molecular complexes is a burgeoning area of research, with critical scientific challenges that must be addressed. A fundamental understanding of individual reaction steps is needed, particularly for cleavage of N-H bonds and formation of N-N bonds. This Perspective evaluates the challenges of designing molecular catalysts for oxidation of ammonia and highlights recent key contributions to realizing the goals of viable energy storage and retrieval based on the N-H bonds of ammonia in a carbon-free energy cycle.
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Affiliation(s)
- Peter L Dunn
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Brian J Cook
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Samantha I Johnson
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Aaron M Appel
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - R Morris Bullock
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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31
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Bruch QJ, Connor GP, McMillion ND, Goldman AS, Hasanayn F, Holland PL, Miller AJM. Considering Electrocatalytic Ammonia Synthesis via Bimetallic Dinitrogen Cleavage. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02606] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Quinton J. Bruch
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Gannon P. Connor
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Noah D. McMillion
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Alan S. Goldman
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903, United States
| | - Faraj Hasanayn
- Department of Chemistry, American University of Beirut, Beirut 1107 2020, Lebanon
| | - Patrick L. Holland
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Alexander J. M. Miller
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
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32
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Spielvogel KD, Luna JA, Loria SM, Weisburn LP, Stumme NC, Ringenberg MR, Durgaprasad G, Keith JM, Shaw SK, Daly SR. Influence of Multisite Metal-Ligand Cooperativity on the Redox Activity of Noninnocent N 2S 2 Ligands. Inorg Chem 2020; 59:10845-10853. [PMID: 32639726 DOI: 10.1021/acs.inorgchem.0c01353] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Metal-ligand cooperativity (MLC) relies on chemically reactive ligands to assist metals with small-molecule binding and activation, and it has facilitated unprecedented examples of catalysis with metal complexes. Despite growing interest in combining ligand-centered chemical and redox reactions for chemical transformations, there are few studies demonstrating how chemically engaging redox active ligands in MLC affects their electrochemical properties when bound to metals. Here we report stepwise changes in the redox activity of model Ru complexes as zero, one, and two BH3 molecules undergo MLC binding with a triaryl noninnocent N2S2 ligand derived from o-phenylenediamine (L1). A similar series of Ru complexes with a diaryl N2S2 ligand with ethylene substituted in place of phenylene (L2) is also described to evaluate the influence of the o-phenylenediamine subunit on redox activity and MLC. Cyclic voltammetry (CV) studies and density functional theory (DFT) calculations show that MLC attenuates ligand-centered redox activity in both series of complexes, but electron transfer is still achieved when only one of the two redox-active sites on the ligands is chemically engaged. The results demonstrate how incorporating more than one multifunctional reactive site could be an effective strategy for maintaining redox noninnocence in ligands that are also chemically reactive and competent for MLC.
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Affiliation(s)
- Kyle D Spielvogel
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Javier A Luna
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Sydney M Loria
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Leah P Weisburn
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Nathan C Stumme
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Mark R Ringenberg
- Universität Stuttgart, Institut für Anorganische Chemie, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Gummadi Durgaprasad
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Jason M Keith
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Scott K Shaw
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Scott R Daly
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
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33
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Zhou X, Vasko P, Hicks J, Fuentes MÁ, Heilmann A, Kolychev EL, Aldridge S. Cooperative N-H bond activation by amido-Ge(ii) cations. Dalton Trans 2020; 49:9495-9504. [PMID: 32608471 DOI: 10.1039/d0dt01960g] [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
N-heterocyclic carbene (NHC) and tertiary phosphine-stabilized germylium-ylidene cations, [R(L)Ge:]+, featuring tethered amido substituents at R have been synthesized via halide abstraction. Characterization in the solid state by X-ray crystallography shows these systems to be monomeric, featuring a two-coordinate C,N- or P,N-ligated germanium atom. The presence of the strongly Lewis acidic cationic germanium centre and proximal amide function allows for facile cleavage of N-H bonds in 1,2-fashion: the products resulting from reactions with carbazole feature a tethered secondary amine donor bound to a three-coordinate carbazolyl-GeII centre. In each case, addition of the components of the N-H bond occurs to the same face of the germanium amide function, consistent with a coordination/proton migration mechanism. Such as sequence is compatible with the idea that substrate coordination via the pπ orbital at germanium reduces the extent of N-to-Ge π donation from the amide, thereby enhancing the basicity of the proximal N-group.
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Affiliation(s)
- Xueer Zhou
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK.
| | - Petra Vasko
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK. and Department of Chemistry, Nanoscience Center, University of Jyväskylä, P. O. Box 35, FI-40014 University of Jyväskylä, Finland
| | - Jamie Hicks
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK.
| | - M Ángeles Fuentes
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK.
| | - Andreas Heilmann
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK.
| | - Eugene L Kolychev
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK.
| | - Simon Aldridge
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK.
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34
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Assembly and Redox-Rich Hydride Chemistry of an Asymmetric Mo2S2 Platform. Molecules 2020; 25:molecules25133090. [PMID: 32645878 PMCID: PMC7411697 DOI: 10.3390/molecules25133090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 06/22/2020] [Accepted: 07/02/2020] [Indexed: 11/17/2022] Open
Abstract
Although molybdenum sulfide materials show promise as electrocatalysts for proton reduction, the hydrido species proposed as intermediates remain poorly characterized. We report herein the synthesis, reactions and spectroscopic properties of a molybdenum-hydride complex featuring an asymmetric Mo2S2 core. This molecule displays rich redox chemistry with electrochemical couples at E½ = −0.45, −0.78 and −1.99 V vs. Fc/Fc+. The corresponding hydrido-complexes for all three redox levels were isolated and characterized crystallographically. Through an analysis of solid-state bond metrics and DFT calculations, we show that the electron-transfer processes for the two more positive couples are centered predominantly on the pyridinediimine supporting ligand, whereas for the most negative couple electron-transfer is mostly Mo-localized.
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35
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Essex LA, McSkimming A, Thompson NB, Kelty ML, Hill EA, Harman WH. η2-Arene Binding at High-Spin Fe(I) Enabled by a Sterically Accommodating Tris(pyrazolyl)hydroborate Ligand. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00340] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Laura A. Essex
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Alex McSkimming
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Niklas B. Thompson
- Massachusetts Institute of Technology, 32 Vassar Street, Cambridge, Massachusetts 02139, United States
| | - Margaret L. Kelty
- University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Ethan A. Hill
- University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - W. Hill Harman
- Department of Chemistry, University of California, Riverside, California 92521, United States
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36
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Dunn PL, Johnson SI, Kaminsky W, Bullock RM. Diversion of Catalytic C-N Bond Formation to Catalytic Oxidation of NH 3 through Modification of the Hydrogen Atom Abstractor. J Am Chem Soc 2020; 142:3361-3365. [PMID: 32009401 DOI: 10.1021/jacs.9b13706] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
We report that (TMP)Ru(NH3)2 (TMP = tetramesitylporphryin) is a molecular catalyst for oxidation of ammonia to dinitrogen. An aryloxy radical, tri-tert-butylphenoxyl (ArO·), abstracts H atoms from a bound ammonia ligand of (TMP)Ru(NH3)2, leading to the discovery of a new catalytic C-N coupling to the para position of ArO· to form 4-amino-2,4,6-tri-tert-butylcyclohexa-2,5-dien-1-one. Modification of the aryloxy radical to 2,6-di-tert-butyl-4-tritylphenoxyl radical, which contains a trityl group at the para position, prevents C-N coupling and diverts the reaction to catalytic oxidation of NH3 to give N2. We achieved 125 ± 5 turnovers at 22 °C for oxidation of NH3, the highest turnover number (TON) reported to date for a molecular catalyst.
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Affiliation(s)
- Peter L Dunn
- Center for Molecular Electrocatalysis , Pacific Northwest National Laboratory , Richland , Washington 99352 , United States
| | - Samantha I Johnson
- Center for Molecular Electrocatalysis , Pacific Northwest National Laboratory , Richland , Washington 99352 , United States
| | - Werner Kaminsky
- Department of Chemistry , University of Washington , Box 351700 , Seattle , Washington 98195-1700 , United States
| | - R Morris Bullock
- Center for Molecular Electrocatalysis , Pacific Northwest National Laboratory , Richland , Washington 99352 , United States
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37
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Do DCH, Protchenko AV, Fuentes MÁ, Hicks J, Vasko P, Aldridge S. N–H cleavage vs. Werner complex formation: reactivity of cationic group 14 tetrelenes towards amines. Chem Commun (Camb) 2020; 56:4684-4687. [DOI: 10.1039/d0cc00875c] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Two-coordinate cations [(N-nacnac)E]+ (E = Si, Ge, Sn) react differently towards ammonia/amines: simple adduct formation (Ge,Sn) contrasts with N–H activation (Si).
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Affiliation(s)
- Dinh Cao Huan Do
- Inorganic Chemistry Laboratory
- Department of Chemistry
- University of Oxford
- South Parks Road
- Oxford
| | - Andrey V. Protchenko
- Inorganic Chemistry Laboratory
- Department of Chemistry
- University of Oxford
- South Parks Road
- Oxford
| | - M. Ángeles Fuentes
- Inorganic Chemistry Laboratory
- Department of Chemistry
- University of Oxford
- South Parks Road
- Oxford
| | - Jamie Hicks
- Inorganic Chemistry Laboratory
- Department of Chemistry
- University of Oxford
- South Parks Road
- Oxford
| | - Petra Vasko
- Inorganic Chemistry Laboratory
- Department of Chemistry
- University of Oxford
- South Parks Road
- Oxford
| | - Simon Aldridge
- Inorganic Chemistry Laboratory
- Department of Chemistry
- University of Oxford
- South Parks Road
- Oxford
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38
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Ruthenium-catalysed oxidative conversion of ammonia into dinitrogen. Nat Chem 2019; 11:702-709. [DOI: 10.1038/s41557-019-0293-y] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 06/13/2019] [Indexed: 11/08/2022]
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39
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Bhattacharya P, Heiden ZM, Chambers GM, Johnson SI, Bullock RM, Mock MT. Catalytic Ammonia Oxidation to Dinitrogen by Hydrogen Atom Abstraction. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201903221] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Papri Bhattacharya
- Center for Molecular Electrocatalysis Pacific Northwest National Laboratory P.O. Box 999 Richland WA 99352 USA
| | | | - Geoffrey M. Chambers
- Center for Molecular Electrocatalysis Pacific Northwest National Laboratory P.O. Box 999 Richland WA 99352 USA
| | - Samantha I. Johnson
- Center for Molecular Electrocatalysis Pacific Northwest National Laboratory P.O. Box 999 Richland WA 99352 USA
| | - R. Morris Bullock
- Center for Molecular Electrocatalysis Pacific Northwest National Laboratory P.O. Box 999 Richland WA 99352 USA
| | - Michael T. Mock
- Department of Chemistry and Biochemistry Montana State University Bozeman MT 59717 USA
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40
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Bhattacharya P, Heiden ZM, Chambers GM, Johnson SI, Bullock RM, Mock MT. Catalytic Ammonia Oxidation to Dinitrogen by Hydrogen Atom Abstraction. Angew Chem Int Ed Engl 2019; 58:11618-11624. [PMID: 31115120 DOI: 10.1002/anie.201903221] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 05/06/2019] [Indexed: 12/20/2022]
Abstract
Catalysts for the oxidation of NH3 are critical for the utilization of NH3 as a large-scale energy carrier. Molecular catalysts capable of oxidizing NH3 to N2 are rare. This report describes the use of [Cp*Ru(PtBu 2 NPh 2 )(15 NH3 )][BArF 4 ], (PtBu 2 NPh 2 =1,5-di(phenylaza)-3,7-di(tert-butylphospha)cyclooctane; ArF =3,5-(CF3 )2 C6 H3 ), to catalytically oxidize NH3 to dinitrogen under ambient conditions. The cleavage of six N-H bonds and the formation of an N≡N bond was achieved by coupling H+ and e- transfers as net hydrogen atom abstraction (HAA) steps using the 2,4,6-tri-tert-butylphenoxyl radical (t Bu3 ArO. ) as the H atom acceptor. Employing an excess of t Bu3 ArO. under 1 atm of NH3 gas at 23 °C resulted in up to ten turnovers. Nitrogen isotopic (15 N) labeling studies provide initial mechanistic information suggesting a monometallic pathway during the N⋅⋅⋅N bond-forming step in the catalytic cycle.
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Affiliation(s)
- Papri Bhattacharya
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA
| | | | - Geoffrey M Chambers
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA
| | - Samantha I Johnson
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA
| | - R Morris Bullock
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA
| | - Michael T Mock
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT, 59717, USA
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41
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Bezdek MJ, Chirik PJ. Pyridine(diimine) Chelate Hydrogenation in a Molybdenum Nitrido Ethylene Complex. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00095] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Máté J. Bezdek
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Paul J. Chirik
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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42
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Hickey AK, Wickramasinghe LA, Schrock RR, Tsay C, Müller P. Protonation Studies of Molybdenum(VI) Nitride Complexes That Contain the [2,6-(ArNCH 2) 2NC 5H 3] 2- Ligand (Ar = 2,6-Diisopropylphenyl). Inorg Chem 2019; 58:3724-3731. [PMID: 30807124 DOI: 10.1021/acs.inorgchem.8b03346] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[Ar2N3]Mo(N)(O- t-Bu) (1), which contains the conformationally rigid pyridine-based diamido ligand [2,6-(ArNCH2)2NC5H3]2- (Ar = 2,6-diisopropylphenyl), is a catalyst for the reduction of dinitrogen with protons and electrons. Various acids have been added in order to explore where and how the first proton adds to the complex. The addition of adamantol to 1 produces a five-coordinate bis(adamantoxide), [HAr2N3]Mo(N)(OAd)2 (2a), in which one of the amido nitrogens in the ligand has been protonated and the resulting aniline nitrogen in the [HAr2N3]- ligand is not bound to the metal. The addition of [Ph2NH2][OTf] to 1 produces {[HAr2N3]Mo(N)(O- t-Bu)}(OTf) (3), in which an amido nitrogen has been protonated, but the aniline in the [HAr2N3]- ligand remains bound to the metal. Last, the addition of (2,6-lutidinium)BArF4 (BArF4 = {B(3,5-(CF3)2C6H3)4}-) to 1 yields {[Ar2N3]Mo(N)(LutH)(O- t-Bu)}BArF4, in which LutH+ is hydrogen-bonded to the nitride in the solid state and in dichloromethane with Keq = 412 ± 94 and Δ G = -3.6 ± 0.8 kcal at 22 °C. A similar hydrogen-bonded adduct was formed through the addition of (2-methylpyridinium)BArF4 to 1, but the addition of (pyridinium)BArF4 to 1 leads to the formation of (inter alia) {[HAr2N3]Mo(N)(O- t-Bu)}(BArF4), in which the amide nitrogen has been protonated. The addition of cobaltocene to 3 or {[Ar2N3]Mo(N)(LutH)(O- t-Bu)}(BArF4) leads only to the re-formation of 1. X-ray structural studies were carried out on 2a, 3, and {[Ar2N3]Mo(N)(LutH)(O- t-Bu)}(BArF4).
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Affiliation(s)
- Anne K Hickey
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Lasantha A Wickramasinghe
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Richard R Schrock
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Charlene Tsay
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Peter Müller
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
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Kadassery KJ, Sethi K, Fanara PM, Lacy DC. CO-Photolysis-Induced H-Atom Transfer from MnIO–H Bonds. Inorg Chem 2019; 58:4679-4685. [DOI: 10.1021/acs.inorgchem.9b00322] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Karthika J. Kadassery
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States
| | - Komal Sethi
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States
| | - Paul M. Fanara
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States
| | - David C. Lacy
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States
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44
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Devillard M, Ehlers A, Siegler MA, van der Vlugt JI. Selective Carbanion-Pyridine Coordination of a Reactive P,N Ligand to Rh I. Chemistry 2019; 25:3875-3883. [PMID: 30600857 PMCID: PMC6519283 DOI: 10.1002/chem.201805504] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 12/12/2018] [Indexed: 01/12/2023]
Abstract
Ligands with reactive carbon sites in the periphery of a metal center have emerged as a powerful approach for metal-ligand bond activation. These reactive carbon sites are commonly generated by deprotonation strategies. Carbon-silicon bond cleavage is a potential alternative to access such constructs. Herein, the monodesilylation of bis-silyl-substituted P,N scaffold PNSi2 in the coordination sphere of [RhI (Cl)(CO)(PNSi2 )] (1) with sodium azide is disclosed. This affords a unique dinucleating anionic κ2 -C,N-κ1 -P ligand with a carbanionic methine carbon atom directly bound to rhodium as part of a four-membered Rh-N-C-C rhodacycle. This dimer undergoes meta-pyridine C-H activation facilitated by weak bases, which leads to a desymmetrization of the system and provides a σ,π-bridging 3-pyridyl fragment bound to RhI . The facile Si-C cleavage strategy may pave the way to studying the reactivity and functionalization of a variety of κ2 -C,N-coordinated pyridine scaffolds for selective transformations.
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Affiliation(s)
- Marc Devillard
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
| | - Andreas Ehlers
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
- Department of ChemistryUniversity of Johannesburg, P.O. Box 254Auckland ParkJohannesburgSouth Africa
| | - Maxime A. Siegler
- Department of ChemistryJohns Hopkins University3400 N Charles StreetBaltimoreMD21218USA
| | - Jarl Ivar van der Vlugt
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
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45
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van der Vlugt JI. Radical-Type Reactivity and Catalysis by Single-Electron Transfer to or from Redox-Active Ligands. Chemistry 2019; 25:2651-2662. [PMID: 30084211 PMCID: PMC6471147 DOI: 10.1002/chem.201802606] [Citation(s) in RCA: 127] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Indexed: 12/12/2022]
Abstract
Controlled ligand-based redox-activity and chemical non-innocence are rapidly gaining importance for selective (catalytic) processes. This Concept aims to provide an overview of the progress regarding ligand-to-substrate single-electron transfer as a relatively new mode of operation to exploit ligand-centered reactivity and catalysis based thereon.
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Affiliation(s)
- Jarl Ivar van der Vlugt
- Bio-Inspired Homogeneous and Supramolecular Catalysis Groupvan ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamNetherlands
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46
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Chang MC, Jesse KA, Filatov AS, Anderson JS. Reversible homolytic activation of water via metal-ligand cooperativity in a T-shaped Ni(ii) complex. Chem Sci 2019; 10:1360-1367. [PMID: 30809351 PMCID: PMC6354739 DOI: 10.1039/c8sc03719a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 11/05/2018] [Indexed: 12/18/2022] Open
Abstract
A T-shaped Ni(ii) complex [Tol,PhDHPy]Ni has been prepared and characterized. EPR spectra and DFT calculations of this complex suggest that the electronic structure is best described as a high-spin Ni(ii) center antiferromagnetically coupled with a ligand-based radical. This complex reacts with water at room temperature to generate the dimeric complex [Tol,PhDHPy]Ni(μ-OH)Ni[Tol,PhDHPyH] which has been thoroughly characterized by SXRD, NMR, IR and deuterium-labeling experiments. Addition of simple ligands such as phosphines or pyridine displaces water and demonstrates the reversibility of water activation in this system. The water activation step has been examined by kinetic studies and DFT calculations which suggest an unusual homolytic reaction via a bimetallic mechanism. The ΔH ‡, ΔS ‡ and KIE (k H/k D) of the reaction are 5.5 kcal mol-1, -23.8 cal mol-1 K-1, and 2.4(1), respectively. In addition to the reversibility of water addition, this system is capable of activating water towards net O-atom transfer to substrates such as aromatic C-H bonds and phosphines. This reactivity is facilitated by the ability of the dihydrazonopyrrole ligand to accept H-atoms and illustrates the utility of metal ligand cooperation in activating O-H bonds with high bond dissociation energies.
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Affiliation(s)
- Mu-Chieh Chang
- Department of Chemistry , The University of Chicago , Chicago , Illinois 60637 , USA .
| | - Kate A Jesse
- Department of Chemistry , The University of Chicago , Chicago , Illinois 60637 , USA .
| | - Alexander S Filatov
- Department of Chemistry , The University of Chicago , Chicago , Illinois 60637 , USA .
| | - John S Anderson
- Department of Chemistry , The University of Chicago , Chicago , Illinois 60637 , USA .
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47
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Saund SS, Goldschmid SL, Ng K, Stewart V, Siegler MA, Thoi VS. Exploring ligand non-innocence of coordinatively-versatile diamidodipyrrinato cobalt complexes. Chem Commun (Camb) 2019; 55:1825-1828. [PMID: 30672518 DOI: 10.1039/c8cc08674e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The non-innocence of diamidodipyrrin is explored in a series of cobaltous complexes with novel binding motifs. By varying the coordination modes, a reversible one-electron reduction is remarkably shifted by nearly 200 mV in a single metal-ligand platform. Our study illustrates a new strategy for modifying the redox activity of porphyrin-like scaffolds.
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Affiliation(s)
- Simran S Saund
- Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218, USA.
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Dub PA, Matsunami A, Kuwata S, Kayaki Y. Cleavage of N–H Bond of Ammonia via Metal–Ligand Cooperation Enables Rational Design of a Conceptually New Noyori–Ikariya Catalyst. J Am Chem Soc 2019; 141:2661-2677. [DOI: 10.1021/jacs.8b12961] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Pavel A. Dub
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Asuka Matsunami
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Shigeki Kuwata
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Yoshihito Kayaki
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
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49
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Homogeneous electrocatalytic oxidation of ammonia to N 2 under mild conditions. Proc Natl Acad Sci U S A 2019; 116:2849-2853. [PMID: 30655346 DOI: 10.1073/pnas.1813368116] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We report that ruthenium polypyridyl complexes can catalyze ammonia oxidation to dinitrogen at room temperature and ambient pressure. During bulk electrolysis experiments, gas chromatography and mass spectrometry analysis of the headspace in the electrochemical cell showed that dinitrogen and dihydrogen are generated from ammonia with high faradaic efficiencies. A proposed mechanism where a hydrazine complex is the initial N-N bonded intermediate is supported by chemical and electrochemical experiments. This is a well-defined system for homogeneous electrocatalytic ammonia oxidation. It establishes a platform for answering mechanistic questions relevant to using ammonia to store and distribute renewable energy.
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50
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Sinha S, Sikari R, Sinha V, Jash U, Das S, Brandão P, Demeshko S, Meyer F, de Bruin B, Paul ND. Iron-Catalyzed/Mediated C–N Bond Formation: Competition between Substrate Amination and Ligand Amination. Inorg Chem 2019; 58:1935-1948. [DOI: 10.1021/acs.inorgchem.8b02877] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Suman Sinha
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur Botanic
Garden, Howrah 711103, India
| | - Rina Sikari
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur Botanic
Garden, Howrah 711103, India
| | - Vivek Sinha
- Homogeneous Catalysis Group, van’t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Upasona Jash
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur Botanic
Garden, Howrah 711103, India
| | - Siuli Das
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur Botanic
Garden, Howrah 711103, India
| | - Paula Brandão
- Departamento de Química, CICECO-Instituto de Materiais de Aveiro, Universidade de Aveiro, 3810-193 Aveiro, Portugal
| | - Serhiy Demeshko
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Franc Meyer
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Bas de Bruin
- Homogeneous Catalysis Group, van’t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Nanda D. Paul
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur Botanic
Garden, Howrah 711103, India
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