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Methane Oxidation over the Zeolites-Based Catalysts. Catalysts 2023. [DOI: 10.3390/catal13030604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2023] Open
Abstract
Zeolites have ordered pore structures, good spatial constraints, and superior hydrothermal stability. In addition, the active metal elements inside and outside the zeolite framework provide the porous material with adjustable acid–base property and good redox performance. Thus, zeolites-based catalysts are more and more widely used in chemical industries. Combining the advantages of zeolites and active metal components, the zeolites-based materials are used to catalyze the oxidation of methane to produce various products, such as carbon dioxide, methanol, formaldehyde, formic acid, acetic acid, and etc. This multifunction, high selectivity, and good activity are the key factors that enable the zeolites-based catalysts to be used for methane activation and conversion. In this review article, we briefly introduce and discuss the effect of zeolite materials on the activation of C–H bonds in methane and the reaction mechanisms of complete methane oxidation and selective methane oxidation. Pd/zeolite is used for the complete oxidation of methane to carbon dioxide and water, and Fe- and Cu-zeolite catalysts are used for the partial oxidation of methane to methanol, formaldehyde, formic acid, and etc. The prospects and challenges of zeolite-based catalysts in the future research work and practical applications are also envisioned. We hope that the outcome of this review can stimulate more researchers to develop more effective zeolite-based catalysts for the complete or selective oxidation of methane.
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2
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Chowdhury B, Mehebub Rahaman S, Ghosh A, Mahali K, Sar P, Saha B. Synergistic reinforcement of CPC/TX-100 mixed micellar microenvironment for diperiodatocuprate(III) (DPC) oxidation of 1-propanol and 1,3-propanediol. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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3
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Bete SC, May LK, Woite P, Roemelt M, Otte M. A Copper Cage‐Complex as Mimic of the pMMO Cu
C
Site. Angew Chem Int Ed Engl 2022; 61:e202206120. [PMID: 35731651 PMCID: PMC9544873 DOI: 10.1002/anie.202206120] [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: 04/26/2022] [Indexed: 12/05/2022]
Abstract
The active site of particulate methane monooxygenase (pMMO) and its mechanism of action are not known. Recently, the CuC site emerged as a potential active site, but to date it lacks any study on biomimetic resemblance of the coordination environment provided by the enzyme. Here, the synthesis of a cage ligand providing such an environment is reported. Copper is incorporated, and coordination occurs by the two imidazole and one carboxylate group offered by the ligand. Depending on the oxidation state, it can adopt different coordination modes, as evidenced by the solid‐state structures and computational investigation. The copper(I) state readily reacts with dioxygen and thereby undergoes CH activation. Moreover, the catalytic aerobic oxidation of hydroquinones as ubiquinol mimics is shown. Clean one‐electron oxidation occurs under mild conditions and EPR analysis of the copper(II) state in the presence of water reveals striking similarities to the data obtained from pMMO.
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Affiliation(s)
- Sarah C. Bete
- Institute of Inorganic Chemistry University of Goettingen Tammannstraße 4 37077 Göttingen Germany
| | - Leander K. May
- Institute of Inorganic Chemistry University of Goettingen Tammannstraße 4 37077 Göttingen Germany
| | - Philipp Woite
- Institut für Chemie Humboldt-Universität zu Berlin Brook-Taylor-Straße 2 12489 Berlin Germany
| | - Michael Roemelt
- Institut für Chemie Humboldt-Universität zu Berlin Brook-Taylor-Straße 2 12489 Berlin Germany
| | - Matthias Otte
- Institute of Inorganic Chemistry University of Goettingen Tammannstraße 4 37077 Göttingen Germany
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4
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Kumar P, Al-Attas TA, Hu J, Kibria MG. Single Atom Catalysts for Selective Methane Oxidation to Oxygenates. ACS NANO 2022; 16:8557-8618. [PMID: 35638813 DOI: 10.1021/acsnano.2c02464] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Direct conversion of methane (CH4) to C1-2 liquid oxygenates is a captivating approach to lock carbons in transportable value-added chemicals, while reducing global warming. Existing approaches utilizing the transformation of CH4 to liquid fuel via tandemized steam methane reforming and the Fischer-Tropsch synthesis are energy and capital intensive. Chemocatalytic partial oxidation of methane remains challenging due to the negligible electron affinity, poor C-H bond polarizability, and high activation energy barrier. Transition-metal and stoichiometric catalysts utilizing harsh oxidants and reaction conditions perform poorly with randomized product distribution. Paradoxically, the catalysts which are active enough to break C-H also promote overoxidation, resulting in CO2 generation and reduced carbon balance. Developing catalysts which can break C-H bonds of methane to selectively make useful chemicals at mild conditions is vital to commercialization. Single atom catalysts (SACs) with specifically coordinated metal centers on active support have displayed intrigued reactivity and selectivity for methane oxidation. SACs can significantly reduce the activation energy due to induced electrostatic polarization of the C-H bond to facilitate the accelerated reaction rate at the low reaction temperature. The distinct metal-support interaction can stabilize the intermediate and prevent the overoxidation of the reaction products. The present review accounts for recent progress in the field of SACs for the selective oxidation of CH4 to C1-2 oxygenates. The chemical nature of catalytic sites, effects of metal-support interaction, and stabilization of intermediate species on catalysts to minimize overoxidation are thoroughly discussed with a forward-looking perspective to improve the catalytic performance.
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Affiliation(s)
- Pawan Kumar
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| | - Tareq A Al-Attas
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| | - Jinguang Hu
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| | - Md Golam Kibria
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
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5
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Da Silva WDB, Dias RP, Da Silva JCS. Refining details of the structural and electronic properties of the Cu B site in pMMO enzyme through sequential molecular dynamics/CPKS-EPR calculations. Phys Chem Chem Phys 2022; 24:16611-16621. [PMID: 35730560 DOI: 10.1039/d2cp01217k] [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
This work investigated the structural and electronic properties of the copper mononuclear site of the PmoB part of the pMMO enzyme at the molecular level. We propose that the CuB catalytic site in the soluble portion of pMMO at room temperature and under physiological conditions is a mononuclear copper complex in a distorted octahedral arrangement with the residues His33, His137, and His139 on the equatorial base and two water molecules on the axial axis. Our view was based on the molecular dynamics results and DFT calculations of the electronic paramagnetic resonance parameters and comparisons with experimental EPR data. This new proposed model for the CuB site brings additional support concerning the recent experimental evidence, which pointed out that a saturated coordination sphere of the copper ion in the CuB center is an essential factor that makes it less efficient than the CuC site in the methane oxidation. Therefore, according to the CuB site model proposed here, an additional step involving a displacement of at least one water molecule of the copper coordination sphere by the O2 molecule prior to its activation must be necessary. This scenario is less likely to occur in the CuC center once this one is buried in the alpha-helices, which are part of the pMMO structure bound to the membrane wall, and consequently located in a less solvent-exposed region. In addition, we also present a simple and efficient sequential S-MD/CPKS protocol to compute EPR parameters that can, in principle, be expanded for the study of other copper-containing proteins.
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Affiliation(s)
- William Daniel B Da Silva
- LQCBio: Laboratório de Química Computacional e Modelagem de Biomoléculas, Instituto de Química e Biotecnologia, IQB, Universidade Federal de Alagoas, Campus A. C. Simões, 57072-900, Maceió, AL, Brazil.
| | - Roberta P Dias
- GIMMM: Grupo Interdisciplinar de Modelagem Molecular e Simulação de Materiais, Núcleo Interdisciplinar de Ciências Exatas e da Natureza - NICEN, Campus do Agreste, Universidade Federal de Pernambuco, 55002-970, Caruaru, PE, Brazil
| | - Júlio C S Da Silva
- LQCBio: Laboratório de Química Computacional e Modelagem de Biomoléculas, Instituto de Química e Biotecnologia, IQB, Universidade Federal de Alagoas, Campus A. C. Simões, 57072-900, Maceió, AL, Brazil.
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6
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Bete SC, May LK, Woite P, Roemelt M, Otte M. A Copper Cage‐Complex as Mimic of the pMMO CuC Site. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202206120] [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)
- Sarah C. Bete
- University of Göttingen: Georg-August-Universitat Gottingen Institut für Anorganische Chemie GERMANY
| | - Leander K. May
- Georg-August-Universität Göttingen: Georg-August-Universitat Gottingen Institut für Anorganische Chemie GERMANY
| | - Philipp Woite
- Humboldt-Universitat zu Berlin Institut für Chemie GERMANY
| | - Michael Roemelt
- Humboldt-Universitat zu Berlin Institut für Chemie Brook-Taylor-Straße 2 12489 Berlin GERMANY
| | - Matthias Otte
- Georg-August-Universität Göttingen Institut für Anorganische Chemie, Institut für Anorganische Chemie Tammannstraße 4 37077 Göttingen GERMANY
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7
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Chowdhury B, Sar P, Kumar D, Saha B. Advancement of Cu(III) and Fe(III) directed oxidative transformations: Recent impact of aqueous micellar environment. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117993] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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8
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Petrillo A, Hoffmann A, Becker J, Herres‐Pawlis S, Schindler S. Copper Mediated Intramolecular vs. Intermolecular Oxygenations: The Spacer makes the Difference! Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202100970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Alexander Petrillo
- Institute of Inorganic and Analytical Chemistry Justus-Liebig-University Giessen Heinrich-Buff-Ring 17 35392 Giessen Germany
| | - Alexander Hoffmann
- Institute of Inorganic Chemistry RWTH Aachen University Landoltweg 1a 52074 Aachen Germany
| | - Jonathan Becker
- Institute of Inorganic and Analytical Chemistry Justus-Liebig-University Giessen Heinrich-Buff-Ring 17 35392 Giessen Germany
| | - Sonja Herres‐Pawlis
- Institute of Inorganic Chemistry RWTH Aachen University Landoltweg 1a 52074 Aachen Germany
| | - Siegfried Schindler
- Institute of Inorganic and Analytical Chemistry Justus-Liebig-University Giessen Heinrich-Buff-Ring 17 35392 Giessen Germany
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9
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Norouzi B, Ehsani Tilami S, Ahghari MR. Aluminosilicate nanoparticles decorated by copper hexacyanoferrate as a good electrocatalyst for non-enzymatic hydrogen peroxide sensing. INORG NANO-MET CHEM 2022. [DOI: 10.1080/24701556.2021.2024231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Banafsheh Norouzi
- Department of chemistry, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
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10
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Carsch KM, Iliescu A, McGillicuddy RD, Mason JA, Betley TA. Reversible Scavenging of Dioxygen from Air by a Copper Complex. J Am Chem Soc 2021; 143:18346-18352. [PMID: 34672573 DOI: 10.1021/jacs.1c10254] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report that exposing the dipyrrin complex (EMindL)Cu(N2) to air affords rapid, quantitative uptake of O2 in either solution or the solid-state to yield (EMindL)Cu(O2). The air and thermal stability of (EMindL)Cu(O2) is unparalleled in molecular copper-dioxygen coordination chemistry, attributable to the ligand flanking groups which preclude the [Cu(O2)]1+ core from degradation. Despite the apparent stability of (EMindL)Cu(O2), dioxygen binding is reversible over multiple cycles with competitive solvent exchange, thermal cycling, and redox manipulations. Additionally, rapid, catalytic oxidation of 1,2-diphenylhydrazine to azoarene with the generation of hydrogen peroxide is observed, through the intermittency of an observable (EMindL)Cu(H2O2) adduct. The design principles gleaned from this study can provide insight for the formation of new materials capable of reversible scavenging of O2 from air under ambient conditions with low-coordinate CuI sorbents.
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Affiliation(s)
- Kurtis M Carsch
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Andrei Iliescu
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Ryan D McGillicuddy
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Jarad A Mason
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Theodore A Betley
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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11
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Liu L, Corma A. Isolated metal atoms and clusters for alkane activation: Translating knowledge from enzymatic and homogeneous to heterogeneous systems. Chem 2021. [DOI: 10.1016/j.chempr.2021.04.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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12
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Paul M, Teubner M, Grimm-Lebsanft B, Buchenau S, Hoffmann A, Rübhausen M, Herres-Pawlis S. Influence of the amine donor on hybrid guanidine-stabilized Bis(μ-oxido) dicopper(III) complexes and their tyrosinase-like oxygenation activity towards polycyclic aromatic alcohols. J Inorg Biochem 2021; 224:111541. [PMID: 34416481 DOI: 10.1016/j.jinorgbio.2021.111541] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Revised: 06/30/2021] [Accepted: 07/11/2021] [Indexed: 10/20/2022]
Abstract
The tyrosinase-like activity of hybrid guanidine-stabilized bis(μ-oxido) dicopper(III) complexes [Cu2(μ-O)2(L)2](X)2 (L = 2-{2-((Diethylamino)methyl)phenyl}-1,1,3,3-tetramethylguanidine (TMGbenzNEt2, L2) and 2-{2-((Di-isopropylamino)methyl)phenyl}-1,1,3,3-tetramethylguanidine (TMGbenzNiPr2, L3); X = PF6-, BF4-, CF3SO3-) is described. New aromatic hybrid guanidine amine ligands were developed with varying amine donor function. Their copper(I) complexes were analyzed towards their ability to activate dioxygen in the presence of different weakly coordinating anions. The resulting bis(μ-oxido) species were characterized at low temperatures by UV/Vis and resonance Raman spectroscopy, cryo-ESI mass spectrometry and density functional theory calculations. Small structural changes in the ligand sphere were found to influence the characteristic ligand-to-metal charge transfer (LMCT) features of the bis(μ-oxido) species, correlating a redshift in the UV/Vis spectrum with weaker N-donor function of the ligand. DFT calculations elucidated the influence of the steric and electronic properties of the bis(μ-oxido) species leading to a higher twist of the Cu2O2 plane against the CuN2 plane and a stretching of the Cu2O2 core. Despite their moderate stability at -100 °C, the bis(μ-oxido) complexes exhibited a remarkable activity in catalytic oxygenation reactions of polycyclic aromatic alcohols. Further the selectivity of the catalyst in the hydroxylation reactions of challenging phenolic substrates is not changed despite an increasing shield of the reactive bis(μ-oxido) core. The generated quinones were found to form exclusively bent phenazines, providing a promising strategy to access tailored phenazine derivatives.
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Affiliation(s)
- Melanie Paul
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany
| | - Melissa Teubner
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany; Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | | | - Sören Buchenau
- Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Alexander Hoffmann
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany.
| | - Michael Rübhausen
- Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Sonja Herres-Pawlis
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany.
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13
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Stöhr F, Kulhanek N, Becker J, Göttlich R, Schindler S. Reactivity of Copper(I) Complexes Containing Ligands Derived from (1
S
,3
R
)‐Camphoric Acid with Dioxygen. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Fabian Stöhr
- Institute for Inorganic and Analytical Chemistry Justus-Liebig-University Gießen Heinrich-Buff-Ring 17 35392 Gießen Germany
- Institute for Organic Chemistry Justus-Liebig-University Gießen Heinrich-Buff-Ring 17 35392 Gießen Germany
| | - Niclas Kulhanek
- Institute for Organic Chemistry Justus-Liebig-University Gießen Heinrich-Buff-Ring 17 35392 Gießen Germany
| | - Jonathan Becker
- Institute for Inorganic and Analytical Chemistry Justus-Liebig-University Gießen Heinrich-Buff-Ring 17 35392 Gießen Germany
| | - Richard Göttlich
- Institute for Organic Chemistry Justus-Liebig-University Gießen Heinrich-Buff-Ring 17 35392 Gießen Germany
| | - Siegfried Schindler
- Institute for Inorganic and Analytical Chemistry Justus-Liebig-University Gießen Heinrich-Buff-Ring 17 35392 Gießen Germany
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14
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Donnelly JM, Lermyte F, Wolny JA, Walker M, Breeze BG, Needham RJ, Müller CS, O'Connor PB, Schünemann V, Collingwood JF, Sadler PJ. Cu(III)-bis-thiolato complex forms an unusual mono-thiolato Cu(III)-peroxido adduct. Chem Commun (Camb) 2021; 57:69-72. [PMID: 33337460 DOI: 10.1039/d0cc06921c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The stable complex [bis(toluene-3,4-dithiolato)copper(iii)][NEt3H] has been synthesised and characterised as a square-planar Cu(iii) complex by X-ray photoelectron spectroscopy, cyclic voltammetry and DFT calculations. Intriguingly, when fragmented in FTICR-MS, an unusual [(toluene-3,4-dithiolate)Cu(iii)(peroxide)]- complex is formed by reaction with oxygen. Natural 1,2-dithiolenes known to bind molybdenum might stabilise Cu(iii) in vivo.
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Affiliation(s)
- Jane M Donnelly
- School of Engineering, University of Warwick, Gibbet Hill Road, Coventry CV4 7Al, UK
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15
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Abstract
Multimetallic cofactors supported by weak-field donors frequently function as reaction centers in metalloproteins, and many of these cofactors catalyze small molecule activation (e.g., N2, O2, CO2) with prominent roles in geochemical element cycles or detoxification. Notable examples include the iron-molybdenum cofactor of the molybdenum-dependent nitrogenases, which catalyze N2 fixation, and the NiFe4S4 cluster and the Mo(O)SCu site in various carbon monoxide dehydrogenases. The prevailing proposed reaction mechanisms for these multimetallic cofactors relies on a cooperative pathway, in which the oxidation state changes are distributed over the aggregate coupled with orbital overlap between the substrate and more than one metal ion within the cluster. Such cooperativity has also been proposed for chemical transformations at the surfaces of heterogeneous catalysts. However, the design details that afford cooperative effects and allow such reactivity to be harnessed effectively in homogeneous synthetic systems remain unclear. Relatedly, hydride donors ligated to these metal cluster cofactors are suggested as precursors to the state that reacts with substrates; here too, however, the reactivity of hydride-decorated clusters supported by weak-field ligands is underexplored. Inspired by the reactivity potential of multimetallic assemblies evidenced in biological systems, approaches to design, synthesize, and evaluate reactivity of polynuclear metal compounds have been actively explored. In a similar vein to the templating function afforded by enzyme active sites, a carefully engineered organic ligand can be employed to control metal nuclearity of the complex and the local coordination environment of each metal center. This Account presents our efforts within this field, beginning with ligand design considerations followed by a survey of observed small molecule activation by trimetallic cyclophanates. We highlight the distinct reactivity outcomes accessed by multimetallic compounds as compared to aggregates that assemble in reaction mixtures from monometallic precursors. Contributing to the opportunity for programmed cooperativity in these designed multimetallic compounds, the cyclophane also dictates the orientation of substrate binding and metal-substrate interactions, which has a prominent influence on reactivity. For example, the dinitrogen-tricopper(I) cyclophanate reacts with dioxygen with markedly different results as compared to monocopper compounds. As an unexpected outcome, one series of tricopper compounds were discovered to be competent catalysts for carbon dioxide reduction to oxalate-a formally one-electron process-hinting at an inherently broader reaction scope for weak-field clusters at lowering the barrier for one-electron pathways as well as multielectron redox transformations. Further reflecting the role of the ligand in tuning reactivity, the trimetallic trihydride cluster compounds, [M3(μ-H)3]3+ (M = FeII, CoII, ZnII), demonstrate substrate specificity for CO2 over various other unsaturated molecules and surprising stability toward water. This series reflects the role of the local environment of a shallow ligand pocket to control substrate access. Summed together, the systems described here evidence the anticipated cooperative reactivity accessed in designed multimetallic species vs self-assembled monometallic systems (e.g., O2 activation and O atom transfer) as well as control of substrate access by seemingly subtle structural effects. Indeed, future efforts aim to interrogate the limits of cooperativity in these systems as well as the role of ligand dynamics and sterics on reactivity.
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Affiliation(s)
- Ricardo B. Ferreira
- Center for Catalysis and Florida Center for Heterocyclic Chemistry, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Leslie J. Murray
- Center for Catalysis and Florida Center for Heterocyclic Chemistry, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
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16
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Keown W, Large TAG, Chiang L, Wasinger EC, Stack TDP. Exclusive imidazole ligation to CuIII2O 2 and Cu IIICuII2O 2 cores. Chem Commun (Camb) 2019; 55:7390-7393. [DOI: 10.1039/c9cc02982f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Direct oxygenation of imidazole-ligated Cu(i) generates dinuclear and trinuclear Cu(iii) species with exclusive imidazole ligation.
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Affiliation(s)
- William Keown
- Department of Chemistry
- Stanford University
- Stanford
- USA
| | | | - Linus Chiang
- Department of Chemistry
- Stanford University
- Stanford
- USA
- Department of Chemistry
| | - Erik C. Wasinger
- Department of Chemistry and Biochemistry
- California State University
- Chico
- USA
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17
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Cui XY, Tan CH, Leow D. Metal-catalysed reactions enabled by guanidine-type ligands. Org Biomol Chem 2019; 17:4689-4699. [DOI: 10.1039/c8ob02240b] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A review of metal–guanidine complexes, which are selective and powerful catalysts for organic transformations, asymmetric synthesis, and polymerisation.
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Affiliation(s)
- Xi-Yang Cui
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
| | - Choon-Hong Tan
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
| | - Dasheng Leow
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
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18
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Large TAG, Mahadevan V, Keown W, Stack TDP. Selective Oxidation of Exogenous Substrates by a Bis-Cu(III) Bis-Oxide Complex: Mechanism and Scope. Inorganica Chim Acta 2018; 486:782-792. [PMID: 31485082 DOI: 10.1016/j.ica.2018.11.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Cu(III)2(μ-O)2 bis-oxides (O) form spontaneously by direct oxygenation of nitrogen-chelated Cu(I) species and constitute a diverse class of versatile 2e-/2H+ oxidants, but while these species have attracted attention as biomimetic models for dinuclear Cu enzymes, reactivity is typically limited to intramolecular ligand oxidation, and systems exhibiting synthetically useful reactivity with exogenous substrates are limited. O tmpd (TMPD = N 1 , N 1 , N 3 , N 3 -tetramethylpropane-1,3-diamine) presents an exception, readily oxidizing a diverse array of exogenous substrates, including primary alcohols and amines selectively over their secondary counterparts in good yields. Mechanistic and DFT analyses suggest substrate oxidation proceeds through initial axial coordination, followed by rate limiting rotation to position the substrate in the Cu(III) equatorial plane, whereupon rapid deprotonation and oxidation by net hydride transfer occurs. Together, the results suggest the selectivity and broad substrate scope unique to O tmpd are best attributed to the combination of ligand flexibility, limited steric demands, and ligand oxidative stability. In keeping with the absence of rate limiting C-H scission, O tmpd exhibits a marked insensitivity to the strength of the substrate Cα-H bond, readily oxidizing benzyl alcohol and 1 octanol at near identical rates.
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Affiliation(s)
- Tao A G Large
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | | | - William Keown
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | - T Daniel P Stack
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
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19
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Abstract
Powder materials containing copper ions supported on ZSM-5 (Cu-Zeolite Socony Mobil-5) and SSZ-13 (Cu-Standard Oil synthesised zeolite-13), and predominantly CuO nanoparticles on amorphous SiO 2 were synthesised, characterised, wash-coated onto ceramic monoliths and, for the first time, compared as catalysts for direct conversion of methane to methanol (DCMM) at ambient pressure (1 atm) using O 2 , N 2 O and NO as oxidants. Methanol production was monitored and quantified using Fourier transform infrared spectroscopy. Methanol is formed over all monolith samples, though the formation is considerably higher for the copper-exchanged zeolites. Hence, copper ions are the main active sites for DCMM. The minor amount of methanol produced over the Cu/SiO 2 sample, however, suggests that zeolites are not the sole substrate that can host those active copper sites but also silica. Further, we present the first ambient pressure in situ infrared spectroscopic measurements revealing the formation and consumption of surface methoxy species, which are considered to be key intermediates in the DCMM reaction.
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20
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Moegling J, Hoffmann A, Thomas F, Orth N, Liebhäuser P, Herber U, Rampmaier R, Stanek J, Fink G, Ivanović-Burmazović I, Herres-Pawlis S. Designed To React: Terminal Copper Nitrenes and Their Application in Catalytic C-H Aminations. Angew Chem Int Ed Engl 2018; 57:9154-9159. [PMID: 29734490 DOI: 10.1002/anie.201713171] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 03/10/2018] [Indexed: 12/11/2022]
Abstract
Heteroscorpionate ligands of the bis(pyrazolyl)methane family have been applied in the stabilisation of terminal copper tosyl nitrenes. These species are highly active intermediates in the copper-catalysed direct C-H amination and nitrene transfer. Novel perfluoroalkyl-pyrazolyl- and pyridinyl-containing ligands were synthesized to coordinate to a reactive copper nitrene centre. Four distinct copper tosyl nitrenes were prepared at low temperatures by the reaction with SO2 tBuPhINTs and copper(I) acetonitrile complexes. Their stoichiometric reactivity has been elucidated regarding the imination of phosphines and the aziridination of styrenes. The formation and thermal decay of the copper nitrenes were investigated by UV/Vis spectroscopy of the highly coloured species. Additionally, the compounds were studied by cryo-UHR-ESI mass spectrometry and DFT calculations. In addition, a mild catalytic procedure has been developed where the copper nitrene precursors enable the C-H amination of cyclohexane and toluene and the aziridination of styrenes.
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Affiliation(s)
- Julian Moegling
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Alexander Hoffmann
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Fabian Thomas
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Nicole Orth
- Department Chemie und Pharmazie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058, Erlangen, Germany
| | - Patricia Liebhäuser
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Ulrich Herber
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Robert Rampmaier
- Department für Chemie und Pharmazie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377, München, Germany
| | - Julia Stanek
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Gerhard Fink
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Ivana Ivanović-Burmazović
- Department Chemie und Pharmazie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058, Erlangen, Germany
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
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21
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Moegling J, Hoffmann A, Thomas F, Orth N, Liebhäuser P, Herber U, Rampmaier R, Stanek J, Fink G, Ivanović-Burmazović I, Herres-Pawlis S. Maßgeschneiderte terminale Kupfernitrene für katalytische C-H-Aminierungen. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201713171] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Julian Moegling
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Deutschland
| | - Alexander Hoffmann
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Deutschland
| | - Fabian Thomas
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Deutschland
| | - Nicole Orth
- Department Chemie und Pharmazie; Friedrich-Alexander-Universität Erlangen-Nürnberg; Egerlandstraße 1 91058 Erlangen Deutschland
| | - Patricia Liebhäuser
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Deutschland
| | - Ulrich Herber
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Deutschland
| | - Robert Rampmaier
- Department für Chemie und Pharmazie; Ludwig-Maximilians-Universität München; Butenandtstraße 5-13 81377 München Deutschland
| | - Julia Stanek
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Deutschland
| | - Gerhard Fink
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Deutschland
| | - Ivana Ivanović-Burmazović
- Department Chemie und Pharmazie; Friedrich-Alexander-Universität Erlangen-Nürnberg; Egerlandstraße 1 91058 Erlangen Deutschland
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Deutschland
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22
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Sonogashira-type cross-coupling reactions catalyzed by copper complexes of pincer N-heterocyclic carbenes. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.02.028] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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23
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Liu Y, Yu H, Guo QX. DFT study on α-regioselectivity of photo-organocatalytic functionalization of aldehydes. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2017.10.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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24
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Abstract
Aerobic methanotrophs have long been known to play a critical role in the global carbon cycle, being capable of converting methane to biomass and carbon dioxide. Interestingly, these microbes exhibit great sensitivity to copper and rare-earth elements, with the expression of key genes involved in the central pathway of methane oxidation controlled by the availability of these metals. That is, these microbes have a "copper switch" that controls the expression of alternative methane monooxygenases and a "rare-earth element switch" that controls the expression of alternative methanol dehydrogenases. Further, it has been recently shown that some methanotrophs can detoxify inorganic mercury and demethylate methylmercury; this finding is remarkable, as the canonical organomercurial lyase does not exist in these methanotrophs, indicating that a novel mechanism is involved in methylmercury demethylation. Here, we review recent findings on methanotrophic interactions with metals, with a particular focus on these metal switches and the mechanisms used by methanotrophs to bind and sequester metals.
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25
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Li ST, Braun-Cula B, Hoof S, Limberg C. Copper(i) complexes based on ligand systems with two different binding sites: synthesis, structures and reaction with O 2. Dalton Trans 2018; 47:544-560. [PMID: 29239430 DOI: 10.1039/c7dt03752j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of the ligand systems L1 and L2 with two different N3-binding sites linked through a dibenzofuran spacer and their coordination properties towards a variety of CuI precursors are reported. The reaction of L1 with copper halides leads to the formation of a bimetallic species [(L1)(CuICl)2] (1), and metallodimers [((L1)(CuIX)2)2(μ-(Cu)(μ-X)2)] (2: X = Br, 3: X = I) in which two dicopper complexes are bridged by a (μ-(Cu)(μ-X)2)-moiety whereas L2 reacts with copper chloride to afford {[Cu(L2)Cl2]}n (8). Furthermore, starting from L1 in combination with copper(i) salts of weakly coordinating anions the dicopper complexes [(L1)(CuI(NCCH3))2](BF4)2 (4), [(L1)(CuI(NCCH3))(Cu(Y))](Y) (5: Y = OTf, 6: Y = ClO4) and [(L1)(Cu(dppe))](PF6)2 (7) were isolated, and employing L2, the complexes [(L2)(CuI(NCCH3))2](Z)2 (9: Z = PF6, 10: Z = OTf) and [(L2)(Cu(dppe))](PF6)2 (11) were obtained. Complexes 4-6 as well as 9 and 10 react rapidly with O2 to form metastable O2 adducts in acetone at -90 °C, where O2 is bound between the two copper centers within one dicopper molecule, as evidenced by UV/Vis spectroscopy, kinetic investigations, Raman spectroscopy and studies with ligands containing the isolated donor sites. The reactivity of the O2 adducts towards selected substrates was also investigated, showing their ability to act as electrophiles as well as nucleophiles.
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Affiliation(s)
- S T Li
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
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26
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Papanikolaou MG, Hadjithoma S, Chatzikypraiou DS, Papaioannou D, Drouza C, Tsipis AC, Miras HN, Keramidas AD, Kabanos TA. Investigation of dioxygen activation by copper(ii)–iminate/aminate complexes. Dalton Trans 2018; 47:16242-16254. [DOI: 10.1039/c8dt03137a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
CuII amidate/iminate complexes activate dioxygen by a ligated to CuII, –HCN– moiety.
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Affiliation(s)
- Michael G. Papanikolaou
- Section of Inorganic and Analytical Chemistry
- Department of Chemistry
- University of Ioannina
- Ioannina 45110
- Greece
| | | | - Dimitra S. Chatzikypraiou
- Section of Inorganic and Analytical Chemistry
- Department of Chemistry
- University of Ioannina
- Ioannina 45110
- Greece
| | - Dionysios Papaioannou
- Laboratory of Synthetic Organic Chemistry
- Department of Chemistry
- University of Patras
- GR-26504 Patras
- Greece
| | - Chryssoula Drouza
- Department of Agricultural Sciences
- Biotechnology and Food Science
- Cyprus University of Technology
- Limassol 3036
- Cyprus
| | - Athanassios C. Tsipis
- Section of Inorganic and Analytical Chemistry
- Department of Chemistry
- University of Ioannina
- Ioannina 45110
- Greece
| | | | | | - Themistoklis A. Kabanos
- Section of Inorganic and Analytical Chemistry
- Department of Chemistry
- University of Ioannina
- Ioannina 45110
- Greece
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27
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Goudy V, Jaoul A, Cordier M, Clavaguéra C, Nocton G. Tuning the Stability of Pd(IV) Intermediates Using a Redox Non-innocent Ligand Combined with an Organolanthanide Fragment. J Am Chem Soc 2017; 139:10633-10636. [PMID: 28741942 PMCID: PMC5553092 DOI: 10.1021/jacs.7b05634] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
The unique combination of a divalent
organolanthanide fragment,
Cp*2Yb, with bipyrimidine (bipym) and a palladium
bis-alkyl fragment, PdMe2, allows the rapid formation and
stabilization of a PdIV tris-alkyl moiety after oxidative
addition with MeI. The crucial role of the organolanthanide
fragment is demonstrated by the substitution of bipym by the 4,5,9,10-tetraazaphenanthrene
ligand, which drastically modifies the electronic structure and tunes
the stability of the PdIV species.
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Affiliation(s)
- Violaine Goudy
- LCM, CNRS, Ecole polytechnique, Université Paris-Saclay , Route de Saclay, 91128 Palaiseau Cedex, France
| | - Arnaud Jaoul
- LCM, CNRS, Ecole polytechnique, Université Paris-Saclay , Route de Saclay, 91128 Palaiseau Cedex, France
| | - Marie Cordier
- LCM, CNRS, Ecole polytechnique, Université Paris-Saclay , Route de Saclay, 91128 Palaiseau Cedex, France
| | - Carine Clavaguéra
- Laboratoire de Chimie Physique, CNRS - Université Paris-Sud, Université Paris-Saclay , 15 avenue Jean Perrin, 91405 Orsay Cedex, France
| | - Grégory Nocton
- LCM, CNRS, Ecole polytechnique, Université Paris-Saclay , Route de Saclay, 91128 Palaiseau Cedex, France
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28
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Strassl F, Grimm-Lebsanft B, Rukser D, Biebl F, Biednov M, Brett C, Timmermann R, Metz F, Hoffmann A, Rübhausen M, Herres-Pawlis S. Oxygen Activation by Copper Complexes with an Aromatic Bis(guanidine) Ligand. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700528] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Florian Strassl
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Benjamin Grimm-Lebsanft
- Institut für Nanostruktur- und Festkörperphysik; Universität Hamburg und Center for Free Electron Laser Science; Notkestraße 85 22607 Hamburg Germany
| | - Dieter Rukser
- Institut für Nanostruktur- und Festkörperphysik; Universität Hamburg und Center for Free Electron Laser Science; Notkestraße 85 22607 Hamburg Germany
| | - Florian Biebl
- Institut für Nanostruktur- und Festkörperphysik; Universität Hamburg und Center for Free Electron Laser Science; Notkestraße 85 22607 Hamburg Germany
| | - Mykola Biednov
- Institut für Nanostruktur- und Festkörperphysik; Universität Hamburg und Center for Free Electron Laser Science; Notkestraße 85 22607 Hamburg Germany
| | - Calvin Brett
- Institut für Nanostruktur- und Festkörperphysik; Universität Hamburg und Center for Free Electron Laser Science; Notkestraße 85 22607 Hamburg Germany
| | - Riccardo Timmermann
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Fabian Metz
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Alexander Hoffmann
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Michael Rübhausen
- Institut für Nanostruktur- und Festkörperphysik; Universität Hamburg und Center for Free Electron Laser Science; Notkestraße 85 22607 Hamburg Germany
| | - Sonja Herres-Pawlis
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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29
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Goswami VE, Walli A, Förster M, Dechert S, Demeshko S, Holthausen MC, Meyer F. Acid/base triggered interconversion of μ-η 2:η 2-peroxido and bis(μ-oxido) dicopper intermediates capped by proton-responsive ligands. Chem Sci 2017; 8:3031-3037. [PMID: 28451371 PMCID: PMC5380878 DOI: 10.1039/c6sc04820j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Accepted: 01/22/2017] [Indexed: 12/20/2022] Open
Abstract
CuII2(μ-η2:η2-peroxido) and CuIII2(μ-oxido)2 cores represent key intermediates in copper/dioxygen chemistry, and they are mechanistically important for biological hydroxylation and oxidation reactions mediated by dinuclear (type III) copper metalloenzymes. While the exact nature of the active species in different enzymes is still under debate, shifting equilibria between Cu x /O2 species is increasingly recognized as a means of switching between distinct reactivity patterns of these intermediates. Herein we report comprehensive spectroscopic, crystallographic and computational analysis of a family of synthetic CuII2(μ-η2:η2-peroxido) and CuIII2(μ-oxido)2 dicopper complexes with a bis(oxazoline) (BOX) capping ligand. In particular, we demonstrate that a reversible peroxido/bis(μ-oxido) interconversion of the [Cu2O2] core can be triggered by peripheral (de)protonation events on the ligand backbone. As the copper ions in the enzymes are typically supported by histidine imidazoles that offer a backside N atom amenable to potential (de)protonation, it is well conceivable that the shifting of equilibria between the [Cu2O2] species in response to changes in local pH is biologically relevant.
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Affiliation(s)
- V E Goswami
- Institut für Anorganische Chemie , Georg-August-Universität Göttingen , Tammannstraße 4 , 37077 Göttingen , Germany .
| | - A Walli
- Institut für Anorganische Chemie , Georg-August-Universität Göttingen , Tammannstraße 4 , 37077 Göttingen , Germany .
| | - M Förster
- Institut für Anorganische und Analytische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Straße 7 , 60438 Frankfurt am Main , Germany .
| | - S Dechert
- Institut für Anorganische Chemie , Georg-August-Universität Göttingen , Tammannstraße 4 , 37077 Göttingen , Germany .
| | - S Demeshko
- Institut für Anorganische Chemie , Georg-August-Universität Göttingen , Tammannstraße 4 , 37077 Göttingen , Germany .
| | - M C Holthausen
- Institut für Anorganische und Analytische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Straße 7 , 60438 Frankfurt am Main , Germany .
| | - F Meyer
- Institut für Anorganische Chemie , Georg-August-Universität Göttingen , Tammannstraße 4 , 37077 Göttingen , Germany .
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30
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Quist DA, Diaz DE, Liu JJ, Karlin KD. Activation of dioxygen by copper metalloproteins and insights from model complexes. J Biol Inorg Chem 2017; 22:253-288. [PMID: 27921179 PMCID: PMC5600896 DOI: 10.1007/s00775-016-1415-2] [Citation(s) in RCA: 163] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 11/11/2016] [Indexed: 02/08/2023]
Abstract
Nature uses dioxygen as a key oxidant in the transformation of biomolecules. Among the enzymes that are utilized for these reactions are copper-containing metalloenzymes, which are responsible for important biological functions such as the regulation of neurotransmitters, dioxygen transport, and cellular respiration. Enzymatic and model system studies work in tandem in order to gain an understanding of the fundamental reductive activation of dioxygen by copper complexes. This review covers the most recent advancements in the structures, spectroscopy, and reaction mechanisms for dioxygen-activating copper proteins and relevant synthetic models thereof. An emphasis has also been placed on cofactor biogenesis, a fundamentally important process whereby biomolecules are post-translationally modified by the pro-enzyme active site to generate cofactors which are essential for the catalytic enzymatic reaction. Significant questions remaining in copper-ion-mediated O2-activation in copper proteins are addressed.
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Affiliation(s)
- David A Quist
- Department of Chemistry, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Daniel E Diaz
- Department of Chemistry, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Jeffrey J Liu
- Department of Chemistry, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Kenneth D Karlin
- Department of Chemistry, Johns Hopkins University, Baltimore, MD, 21218, USA.
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31
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Ross MO, Rosenzweig AC. A tale of two methane monooxygenases. J Biol Inorg Chem 2017; 22:307-319. [PMID: 27878395 PMCID: PMC5352483 DOI: 10.1007/s00775-016-1419-y] [Citation(s) in RCA: 148] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 11/15/2016] [Indexed: 11/24/2022]
Abstract
Methane monooxygenase (MMO) enzymes activate O2 for oxidation of methane. Two distinct MMOs exist in nature, a soluble form that uses a diiron active site (sMMO) and a membrane-bound form with a catalytic copper center (pMMO). Understanding the reaction mechanisms of these enzymes is of fundamental importance to biologists and chemists, and is also relevant to the development of new biocatalysts. The sMMO catalytic cycle has been elucidated in detail, including O2 activation intermediates and the nature of the methane-oxidizing species. By contrast, many aspects of pMMO catalysis remain unclear, most notably the nuclearity and molecular details of the copper active site. Here, we review the current state of knowledge for both enzymes, and consider pMMO O2 activation intermediates suggested by computational and synthetic studies in the context of existing biochemical data. Further work is needed on all fronts, with the ultimate goal of understanding how these two remarkable enzymes catalyze a reaction not readily achieved by any other metalloenzyme or biomimetic compound.
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Affiliation(s)
- Matthew O Ross
- Departments of Molecular Biosciences and of Chemistry, Northwestern University, Evanston, IL, 60208, USA
| | - Amy C Rosenzweig
- Departments of Molecular Biosciences and of Chemistry, Northwestern University, Evanston, IL, 60208, USA.
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32
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Gao H, Groves JT. Fast Hydrogen Atom Abstraction by a Hydroxo Iron(III) Porphyrazine. J Am Chem Soc 2017; 139:3938-3941. [PMID: 28245648 DOI: 10.1021/jacs.6b13091] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A reactive hydroxoferric porphyrazine complex, [(PyPz)FeIII(OH) (OH2)]4+ (1, PyPz = tetramethyl-2,3-pyridino porphyrazine), has been prepared via one-electron oxidation of the corresponding ferrous species [(PyPz)FeII(OH2)2]4+ (2). Electrochemical analysis revealed a pH-dependent and remarkably high FeIII-OH/FeII-OH2 reduction potential of 680 mV vs Ag/AgCl at pH 5.2. Nernstian behavior from pH 2 to pH 8 indicates a one-proton, one-electron interconversion throughout that range. The O-H bond dissociation energy of the FeII-OH2 complex was estimated to be 84 kcal mol-1. Accordingly, 1 reacts rapidly with a panel of substrates via C-H hydrogen atom transfer (HAT), reducing 1 to [(PyPz)FeII(OH2)2]4+ (2). The second-order rate constant for the reaction of [(PyPz)FeIII(OH) (OH2)]4+ with xanthene was 2.22 × 103 M-1 s-1, 5-6 orders of magnitude faster than other reported FeIII-OH complexes and faster than many ferryl complexes.
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Affiliation(s)
- Hongxin Gao
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
| | - John T Groves
- Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States
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33
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Wang VCC, Maji S, Chen PPY, Lee HK, Yu SSF, Chan SI. Alkane Oxidation: Methane Monooxygenases, Related Enzymes, and Their Biomimetics. Chem Rev 2017; 117:8574-8621. [PMID: 28206744 DOI: 10.1021/acs.chemrev.6b00624] [Citation(s) in RCA: 249] [Impact Index Per Article: 35.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Methane monooxygenases (MMOs) mediate the facile conversion of methane into methanol in methanotrophic bacteria with high efficiency under ambient conditions. Because the selective oxidation of methane is extremely challenging, there is considerable interest in understanding how these enzymes carry out this difficult chemistry. The impetus of these efforts is to learn from the microbes to develop a biomimetic catalyst to accomplish the same chemical transformation. Here, we review the progress made over the past two to three decades toward delineating the structures and functions of the catalytic sites in two MMOs: soluble methane monooxygenase (sMMO) and particulate methane monooxygenase (pMMO). sMMO is a water-soluble three-component protein complex consisting of a hydroxylase with a nonheme diiron catalytic site; pMMO is a membrane-bound metalloenzyme with a unique tricopper cluster as the site of hydroxylation. The metal cluster in each of these MMOs harnesses O2 to functionalize the C-H bond using different chemistry. We highlight some of the common basic principles that they share. Finally, the development of functional models of the catalytic sites of MMOs is described. These efforts have culminated in the first successful biomimetic catalyst capable of efficient methane oxidation without overoxidation at room temperature.
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Affiliation(s)
- Vincent C-C Wang
- Institute of Chemistry, Academia Sinica , 128, Section 2, Academia Road, Nankang, Taipei 11529, Taiwan
| | - Suman Maji
- School of Chemical Engineering and Physical Sciences, Lovely Professional University , Jalandhar-Delhi G. T. Road (NH-1), Phagwara, Punjab India 144411
| | - Peter P-Y Chen
- Department of Chemistry, National Chung Hsing University , 250 Kuo Kuang Road, Taichung 402, Taiwan
| | - Hung Kay Lee
- Department of Chemistry, The Chinese University of Hong Kong , Shatin, New Territories, Hong Kong
| | - Steve S-F Yu
- Institute of Chemistry, Academia Sinica , 128, Section 2, Academia Road, Nankang, Taipei 11529, Taiwan
| | - Sunney I Chan
- Institute of Chemistry, Academia Sinica , 128, Section 2, Academia Road, Nankang, Taipei 11529, Taiwan.,Department of Chemistry, National Taiwan University , No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan.,Noyes Laboratory, 127-72, California Institute of Technology , 1200 East California Boulevard, Pasadena, California 91125, United States
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34
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Elwell CE, Gagnon NL, Neisen BD, Dhar D, Spaeth AD, Yee GM, Tolman WB. Copper-Oxygen Complexes Revisited: Structures, Spectroscopy, and Reactivity. Chem Rev 2017; 117:2059-2107. [PMID: 28103018 PMCID: PMC5963733 DOI: 10.1021/acs.chemrev.6b00636] [Citation(s) in RCA: 445] [Impact Index Per Article: 63.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A longstanding research goal has been to understand the nature and role of copper-oxygen intermediates within copper-containing enzymes and abiological catalysts. Synthetic chemistry has played a pivotal role in highlighting the viability of proposed intermediates and expanding the library of known copper-oxygen cores. In addition to the number of new complexes that have been synthesized since the previous reviews on this topic in this journal (Mirica, L. M.; Ottenwaelder, X.; Stack, T. D. P. Chem. Rev. 2004, 104, 1013-1046 and Lewis, E. A.; Tolman, W. B. Chem. Rev. 2004, 104, 1047-1076), the field has seen significant expansion in the (1) range of cores synthesized and characterized, (2) amount of mechanistic work performed, particularly in the area of organic substrate oxidation, and (3) use of computational methods for both the corroboration and prediction of proposed intermediates. The scope of this review has been limited to well-characterized examples of copper-oxygen species but seeks to provide a thorough picture of the spectroscopic characteristics and reactivity trends of the copper-oxygen cores discussed.
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Affiliation(s)
- Courtney E Elwell
- Department of Chemistry, Center for Metals in Biocatalysis, University of Minnesota , 207 Pleasant St. SE, Minneapolis, Minnesota 55455, United States
| | - Nicole L Gagnon
- Department of Chemistry, Center for Metals in Biocatalysis, University of Minnesota , 207 Pleasant St. SE, Minneapolis, Minnesota 55455, United States
| | - Benjamin D Neisen
- Department of Chemistry, Center for Metals in Biocatalysis, University of Minnesota , 207 Pleasant St. SE, Minneapolis, Minnesota 55455, United States
| | - Debanjan Dhar
- Department of Chemistry, Center for Metals in Biocatalysis, University of Minnesota , 207 Pleasant St. SE, Minneapolis, Minnesota 55455, United States
| | - Andrew D Spaeth
- Department of Chemistry, Center for Metals in Biocatalysis, University of Minnesota , 207 Pleasant St. SE, Minneapolis, Minnesota 55455, United States
| | - Gereon M Yee
- Department of Chemistry, Center for Metals in Biocatalysis, University of Minnesota , 207 Pleasant St. SE, Minneapolis, Minnesota 55455, United States
| | - William B Tolman
- Department of Chemistry, Center for Metals in Biocatalysis, University of Minnesota , 207 Pleasant St. SE, Minneapolis, Minnesota 55455, United States
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35
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High-valent copper in biomimetic and biological oxidations. J Biol Inorg Chem 2016; 22:289-305. [PMID: 27909921 DOI: 10.1007/s00775-016-1420-5] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 11/17/2016] [Indexed: 10/20/2022]
Abstract
A long-standing debate in the Cu-O2 field has revolved around the relevance of the Cu(III) oxidation state in biological redox processes. The proposal of Cu(III) in biology is generally challenged as no spectroscopic or structural evidence exists currently for its presence. The reaction of synthetic Cu(I) complexes with O2 at low temperature in aprotic solvents provides the opportunity to investigate and define the chemical landscape of Cu-O2 species at a small-molecule level of detail; eight different types are characterized structurally, three of which contain at least one Cu(III) center. Simple imidazole or histamine ligands are competent in these oxygenation reactions to form Cu(III) complexes. The combination of synthetic structural and reactivity data suggests (1) that Cu(I) should be considered as either a one or two electron reductant reacting with O2, (2) that Cu(III) reduction potentials of these formed complexes are modest and well within the limits of a protein matrix and (3) that primary amine and imidazole ligands are surprisingly good at stabilizing Cu(III) centers. These Cu(III) complexes are efficient oxidants for hydroxylating phenolate substrates with reaction hallmarks similar to that performed in biological systems. The remarkable ligation similarity of the synthetic and biological systems makes it difficult to continue to exclude Cu(III) from biological discussions.
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36
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McMoran EP, Powell DR, Perez F, Rowe GT, Yang L. Synthesis and Characterization of Copper Complexes with CuICuI, Cu1.5Cu1.5m and CuIICuII Core Structures Supported by a Flexible Dipyridylamide Ligand. Inorg Chem 2016; 55:11462-11472. [DOI: 10.1021/acs.inorgchem.6b02006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ethan P. McMoran
- Department
of Chemistry, University of Central Arkansas, Conway, Arkansas 72035, United States
| | - Douglas R. Powell
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Felio Perez
- Integrated Microscopy Center, University of Memphis, Memphis, Tennessee 38152, United States
| | - Gerard T. Rowe
- Department
of Chemistry and Physics, University of South Carolina—Aiken, Aiken, South Carolina 29801, United States
| | - Lei Yang
- Department
of Chemistry, University of Central Arkansas, Conway, Arkansas 72035, United States
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37
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Hoffmann A, Wern M, Hoppe T, Witte M, Haase R, Liebhäuser P, Glatthaar J, Herres-Pawlis S, Schindler S. Hand in Hand: Experimental and Theoretical Investigations into the Reactions of Copper(I) Mono- and Bis(guanidine) Complexes with Dioxygen. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600906] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Alexander Hoffmann
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Miriam Wern
- Institut für Anorganische und Analytische Chemie; Justus-Liebig-Universität Gießen; Heinrich-Buff-Ring 17 35392 Gießen Germany
| | - Tobias Hoppe
- Institut für Anorganische und Analytische Chemie; Justus-Liebig-Universität Gießen; Heinrich-Buff-Ring 17 35392 Gießen Germany
| | - Matthias Witte
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Roxana Haase
- Department Chemie; Universität Paderborn; Warburger Str. 100 33098 Paderborn Germany
| | - Patricia Liebhäuser
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Jörg Glatthaar
- Institut für Organische Chemie; Heinrich-Buff-Ring 17 35392 Gießen Germany
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Siegfried Schindler
- Institut für Anorganische und Analytische Chemie; Justus-Liebig-Universität Gießen; Heinrich-Buff-Ring 17 35392 Gießen Germany
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38
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Li ST, Braun-Cula B, Hoof S, Dürr M, Ivanović-Burmazović I, Limberg C. Ligands with Two Different Binding Sites and O2Reactivity of their Copper(I) Complexes. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600420] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sin Ting Li
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Beatrice Braun-Cula
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Santina Hoof
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Maximilian Dürr
- Universität Erlangen-Nürnberg; Lehrstuhl für Bioanorganische Chemie; Egerlandstraße 1 91058 Erlangen Germany
| | - Ivana Ivanović-Burmazović
- Universität Erlangen-Nürnberg; Lehrstuhl für Bioanorganische Chemie; Egerlandstraße 1 91058 Erlangen Germany
| | - Christian Limberg
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
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39
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Gary JB, Citek C, Brown TA, Zare RN, Wasinger EC, Stack TDP. Direct Copper(III) Formation from O2 and Copper(I) with Histamine Ligation. J Am Chem Soc 2016; 138:9986-95. [DOI: 10.1021/jacs.6b05538] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- J. Brannon Gary
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Cooper Citek
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Timothy A. Brown
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Richard N. Zare
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Erik C. Wasinger
- Department
of Chemistry and Biochemistry, California State University, Chico, California 95929, United States
| | - T. Daniel P. Stack
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
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40
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Chiang L, Keown W, Citek C, Wasinger EC, Stack TDP. Simplest Monodentate Imidazole Stabilization of the oxy-Tyrosinase Cu2 O2 Core: Phenolate Hydroxylation through a Cu(III) Intermediate. Angew Chem Int Ed Engl 2016; 55:10453-7. [PMID: 27440390 DOI: 10.1002/anie.201605159] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 06/30/2016] [Indexed: 11/09/2022]
Abstract
Tyrosinases are ubiquitous binuclear copper enzymes that oxygenate to Cu(II) 2 O2 cores bonded by three histidine Nτ-imidazoles per Cu center. Synthetic monodentate imidazole-bonded Cu(II) 2 O2 species self-assemble in a near quantitative manner at -125 °C, but Nπ-ligation has been required. Herein, we disclose the syntheses and reactivity of three Nτ-imidazole bonded Cu(II) 2 O2 species at solution temperatures of -145 °C, which was achieved using a eutectic mixture of THF and 2-MeTHF. The addition of anionic phenolates affords a Cu(III) 2 O2 species, where the bonded phenolates hydroxylate to catecholates in high yields. Similar Cu(III) 2 O2 intermediates are not observed using Nπ-bonded Cu(II) 2 O2 species, hinting that Nτ-imidazole ligation, conserved in all characterized Ty, has functional advantage beyond active-site flexibility. Substrate accessibility to the oxygenated Cu2 O2 core and stabilization of a high oxidation state of the copper centers are suggested from these minimalistic models.
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Affiliation(s)
- Linus Chiang
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
| | - William Keown
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
| | - Cooper Citek
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
| | - Erik C Wasinger
- Department Chemistry and Biochemistry, California State University, Chico, CA, 95929, USA
| | - T Daniel P Stack
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA.
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41
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Chiang L, Keown W, Citek C, Wasinger EC, Stack TDP. Simplest Monodentate Imidazole Stabilization of the oxy‐Tyrosinase Cu
2
O
2
Core: Phenolate Hydroxylation through a Cu
III
Intermediate. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605159] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Linus Chiang
- Department of Chemistry Stanford University Stanford CA 94305 USA
| | - William Keown
- Department of Chemistry Stanford University Stanford CA 94305 USA
| | - Cooper Citek
- Department of Chemistry Stanford University Stanford CA 94305 USA
| | - Erik C. Wasinger
- Department Chemistry and Biochemistry California State University Chico CA 95929 USA
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42
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Engelmann X, Monte-Pérez I, Ray K. Oxidationsreaktionen mit bioinspirierten einkernigen Nicht-Häm-Oxidometallkomplexen. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201600507] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xenia Engelmann
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Deutschland
| | - Inés Monte-Pérez
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Deutschland
| | - Kallol Ray
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Deutschland
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43
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Engelmann X, Monte-Pérez I, Ray K. Oxidation Reactions with Bioinspired Mononuclear Non-Heme Metal-Oxo Complexes. Angew Chem Int Ed Engl 2016; 55:7632-49. [DOI: 10.1002/anie.201600507] [Citation(s) in RCA: 207] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2016] [Revised: 03/15/2016] [Indexed: 12/22/2022]
Affiliation(s)
- Xenia Engelmann
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Strasse 2 12489 Berlin Germany
| | - Inés Monte-Pérez
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Strasse 2 12489 Berlin Germany
| | - Kallol Ray
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Strasse 2 12489 Berlin Germany
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44
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Stability and reactivity of copper oxo-clusters in ZSM-5 zeolite for selective methane oxidation to methanol. J Catal 2016. [DOI: 10.1016/j.jcat.2016.03.014] [Citation(s) in RCA: 172] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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45
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Itoyama S, Doitomi K, Kamachi T, Shiota Y, Yoshizawa K. Possible Peroxo State of the Dicopper Site of Particulate Methane Monooxygenase from Combined Quantum Mechanics and Molecular Mechanics Calculations. Inorg Chem 2016; 55:2771-5. [DOI: 10.1021/acs.inorgchem.5b02603] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shuhei Itoyama
- Institute
for Materials Chemistry and Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Kazuki Doitomi
- Institute
for Materials Chemistry and Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Takashi Kamachi
- Institute
for Materials Chemistry and Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Yoshihito Shiota
- Institute
for Materials Chemistry and Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Kazunari Yoshizawa
- Institute
for Materials Chemistry and Engineering, Kyushu University, Fukuoka 819-0395, Japan
- Elements
Strategy Initiative for Catalysts and Batteries, Kyoto University, Kyoto 615-8245, Japan
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46
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Zhang Q, Zhang ZQ, Fu Y, Yu HZ. Mechanism of the Visible Light-Mediated Gold-Catalyzed Oxyarylation Reaction of Alkenes. ACS Catal 2016. [DOI: 10.1021/acscatal.5b01971] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Qi Zhang
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Department
of Chemistry and Centre for Atomic Engineering of Advanced Materials, Anhui University, Hefei 230601, China
| | - Zhen-Qi Zhang
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Yao Fu
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Hai-Zhu Yu
- Department
of Chemistry and Centre for Atomic Engineering of Advanced Materials, Anhui University, Hefei 230601, China
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47
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Da Silva JCS, Pennifold RCR, Harvey JN, Rocha WR. A radical rebound mechanism for the methane oxidation reaction promoted by the dicopper center of a pMMO enzyme: a computational perspective. Dalton Trans 2016; 45:2492-504. [DOI: 10.1039/c5dt02638e] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Hydrogen Atom Transfer (HAT) promoted by a triplet state of the bis-oxoCu2(iii) core generates a new radical rebound mechanism for the hydroxylation of methane catalyzed by the binuclear copper site of a pMMO enzyme.
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Affiliation(s)
- Júlio C. S. Da Silva
- BioMat: Biomaterial Modeling Group
- Departamento de Química Fundamental
- CCEN
- Universidade Federal de Pernambuco
- Cidade Universitária
| | | | | | - Willian R. Rocha
- LQC-MM: Laboratório de Química Computacional e Modelagem Molecular
- Departamento de Química
- ICEX
- Universidade Federal de Minas Gerais
- Belo Horizonte
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48
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See YY, Herrmann AT, Aihara Y, Baran PS. Scalable C-H Oxidation with Copper: Synthesis of Polyoxypregnanes. J Am Chem Soc 2015; 137:13776-9. [PMID: 26466196 PMCID: PMC5287264 DOI: 10.1021/jacs.5b09463] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Steroids bearing C12 oxidations are widespread in nature, yet only one preparative chemical method addresses this challenge in a low-yielding and not fully understood fashion: Schönecker's Cu-mediated oxidation. This work shines new light onto this powerful C-H oxidation method through mechanistic investigation, optimization, and wider application. Culminating in a scalable, rapid, high-yielding, and operationally simple protocol, this procedure is applied to the first synthesis of several parent polyoxypregnane natural products, representing a gateway to over 100 family members.
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Affiliation(s)
- Yi Yang See
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Aaron T. Herrmann
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Yoshinori Aihara
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Phil S. Baran
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
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49
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Herres-Pawlis S, Haase R, Verma P, Hoffmann A, Kang P, Stack TDP. Formation of hybrid guanidine-stabilized bis(μ-oxo)dicopper cores in solution: Electronic and steric perturbations. Eur J Inorg Chem 2015; 2015:5426-5436. [PMID: 27990098 PMCID: PMC5158105 DOI: 10.1002/ejic.201500884] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Indexed: 11/07/2022]
Abstract
A series of new hybrid peralkylated-amine-guanidine ligands based on a 1,3-propanediamine backbone and their Cu-O2 chemistry is reported. The copper(I) complexes react readily with O2 at low temperatures in aprotic solvents with weakly coordinating anions to form exclusively bis(μ-oxo) dicopper species (O). Variation of the substituents on each side of the hybrid bidentate ligand highlights that less sterically demanding amine and guanidine substituents increase not only the thermal stability of the formed O cores but enhance inner-sphere phenolate hydroxylation pathways. TD-DFT analysis on selected guanidine-amine O species suggest that the additional visible feature observed is a guanidine π*→ Cu2O2 LMCT, which appears along with the classic oxo-ζu*→Cu(III) and πζ*→ Cu(III) LMCT transitions.
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Affiliation(s)
- Sonja Herres-Pawlis
- Lehrstuhl für Bioanorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Roxana Haase
- Department Chemie, Anorganische Chemie, Universität Paderborn, 33098 Paderborn, Germany
| | - Pratik Verma
- Department of Chemistry, Stanford University, Stanford, California 94305
| | - Alexander Hoffmann
- Lehrstuhl für Bioanorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Peng Kang
- Department of Chemistry, Stanford University, Stanford, California 94305
| | - T Daniel P Stack
- Department of Chemistry, Stanford University, Stanford, California 94305
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50
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Citek C, Herres-Pawlis S, Stack TDP. Low temperature syntheses and reactivity of Cu2O2 active-site models. Acc Chem Res 2015; 48:2424-33. [PMID: 26230113 DOI: 10.1021/acs.accounts.5b00220] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Nature's facility with dioxygen outmatches modern chemistry in the oxidation and oxygenation of materials and substrates for biosynthesis and cellular metabolism. The Earth's most abundant naturally occurring oxidant is-frankly-poorly understood and controlled, and thus underused. Copper-based enzyme metallocofactors are ubiquitous to the efficient consumption of dioxygen by all domains of life. Over the last several decades, we have joined many research groups in the study of copper- and dioxygen-dependent enzymes through close investigation of synthetically derived, small-molecule active-site analogs. Simple copper-dioxygen clusters bearing structural and spectroscopic similarity to dioxygen-activating enzymes can be probed for their fundamental geometrical, electronic, and reactive properties using the tools available to inorganic and synthetic chemistry. Our exploration of the copper-dioxygen arena has sustained product evaluation of the key dynamics and reactivity of binuclear Cu2O2 compounds. Almost exclusively operating at low temperatures, from -78 °C to solution characterization even at -125 °C, we have identified numerous compounds supported by simple and easily accessed, low molecular weight ligands-chiefly families of bidentate diamine chelates. We have found that by stripping away complexity in comparison to extended protein tertiary structures or sophisticated, multinucleating architectures, we can experimentally manipulate activated compounds and open pathways of reactivity toward exogenous substrates that both inform on and extend fundamental mechanisms of oxygenase enzymes. Our recent successes have advanced understanding of the tyrosinase enzyme, and related hemocyanin and NspF, and the copper membrane monooxygenases, specifically particulate methane monooxygenase (pMMO) and ammonia monooxygenase (AMO). Tyrosinase, ubiquitously distributed throughout life, is fundamental to the copper-based oxidation of phenols and the production of chromophores by dedicated biosynthesis or incidental oxidative browning. The copper membrane monooxygenases are comparatively new entrants to the copper-dioxygen field. While pMMO mediates the synthetically tantalizing transformation of methane to methanol, AMO catalyzes the first metabolic step in deriving chemical energy from ammonia-a reaction massively represented on a global scale and a critical component of chemical homeostasis on Earth. In this Account, we begin by introduction of the synthetic copper-dioxygen chemistry field, from techniques to the differential coordination of dioxygen with copper. Then, we describe the unambiguous self-assembly of an oxygenated tyrosinase mimic from basic constituents (copper, dioxygen, and monodentate-imidazole histidine analogs) and the resulting emergence of intrinsic reactivity, free of any influence due to the protein environment. Next, we discuss the first catalytic oxidation of phenol through a fully characterized tyrosinase mimic, derived from molecular oxygen, and its application to substrates unreactive in the native enzyme system. Finally, we detail evidence for chemical plausibility of dioxygen activation in pMMO (and AMO) through a high-valent species and the thermodynamic criteria that beg introduction of the Cu(III) state to biological redox catalysis.
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Affiliation(s)
- Cooper Citek
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Sonja Herres-Pawlis
- Institute of Inorganic Chemistry, RWTH Aachen University, Aachen 52074, Germany
| | - T. Daniel P. Stack
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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