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Zhong X, Bouchey CJ, Kabir E, Tolman WB. Using a monocopper-superoxo complex to prepare multicopper-peroxo species relevant to proposed enzyme intermediates. J Inorg Biochem 2021; 222:111498. [PMID: 34120095 PMCID: PMC9835715 DOI: 10.1016/j.jinorgbio.2021.111498] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Revised: 05/29/2021] [Accepted: 05/29/2021] [Indexed: 01/16/2023]
Abstract
With the goal of generating a (peroxo)tricopper species analogous to the Peroxy Intermediate proposed for multicopper oxidases, solutions of the copper-superoxide complex [K(Krypt)][LCuO2] (L = N,N'-bis(2,6-diisopropylphenyl)-2,6-pyridinedicarboxamide, Krypt = 4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8]hexacosane) were reacted with the dicopper(I) complex [(TPBN)Cu2(MeCN)2][PF6]2 at -70 °C (TPBN = N,N,N',N'-tetrakis-(2-pyridylmethyl)-1,4-diaminobutane). A metastable intermediate formed, which on the basis of UV-vis, EPR, and resonance Raman spectroscopy was proposed to derive from reaction of two equivalents of the copper-superoxide with one equivalent of the dicopper(I) complex to yield a complex with two (peroxo)dicopper moieties rather than the desired (peroxo)tricopper PI model. A similar intermediate formed upon reaction of [K(Krypt)][LCuO2] with [(BPMA)Cu(MeCN)][PF6] (BPMA = N,N-bis(2-pyridylmethyl)-methyl-amine), which contained the same donor set as provided by TPBN. Comparison of resonance Raman data and consideration of structural preferences for LCuX species led to hypothesis of a μ-η1:η2-peroxo structure for both intermediates.
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Affiliation(s)
- Xinzhe Zhong
- Department of Chemistry, Washington University in St. Louis, One Brookings Hall, Campus Box 1134, St. Louis, MO 63130-4899, United States of America
| | - Caitlin J. Bouchey
- Department of Chemistry, Washington University in St. Louis, One Brookings Hall, Campus Box 1134, St. Louis, MO 63130-4899, United States of America,Department of Chemistry, University of Minnesota, 207 Pleasant St. SE, Minneapolis, MN 55455, United States of America
| | - Evanta Kabir
- Department of Chemistry, Washington University in St. Louis, One Brookings Hall, Campus Box 1134, St. Louis, MO 63130-4899, United States of America
| | - William B. Tolman
- Department of Chemistry, Washington University in St. Louis, One Brookings Hall, Campus Box 1134, St. Louis, MO 63130-4899, United States of America,Corresponding author. (W.B. Tolman)
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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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Gennarini F, David R, López I, Le Mest Y, Réglier M, Belle C, Thibon-Pourret A, Jamet H, Le Poul N. Influence of Asymmetry on the Redox Properties of Phenoxo- and Hydroxo-Bridged Dicopper Complexes: Spectroelectrochemical and Theoretical Studies. Inorg Chem 2017; 56:7707-7719. [DOI: 10.1021/acs.inorgchem.7b00338] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Federica Gennarini
- Université de Bretagne Occidentale, CNRS UMR 6521, Laboratoire CEMCA, 6
Avenue Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France
| | - Rolf David
- Université Grenoble Alpes - Grenoble1, CNRS-UGA UMR 5250, Laboratoire DCM/Cire, CS 40700, 38058 Grenoble Cedex 9, France
| | - Isidoro López
- Université de Bretagne Occidentale, CNRS UMR 6521, Laboratoire CEMCA, 6
Avenue Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France
| | - Yves Le Mest
- Université de Bretagne Occidentale, CNRS UMR 6521, Laboratoire CEMCA, 6
Avenue Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France
| | - Marius Réglier
- Université Aix Marseille, CNRS UMR 7313, Laboratoire de ISM2/BiosCiences, 52 avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France
| | - Catherine Belle
- Université Grenoble Alpes - Grenoble1, CNRS-UGA UMR 5250, Laboratoire DCM/Cire, CS 40700, 38058 Grenoble Cedex 9, France
| | - Aurore Thibon-Pourret
- Université Grenoble Alpes - Grenoble1, CNRS-UGA UMR 5250, Laboratoire DCM/Cire, CS 40700, 38058 Grenoble Cedex 9, France
- Institut de Chimie, CLAC, UMR 7177 CNRS, Université de Strasbourg, 67008 Strasbourg, France
| | - Hélène Jamet
- Université Grenoble Alpes - Grenoble1, CNRS-UGA UMR 5250, Laboratoire DCM/Cire, CS 40700, 38058 Grenoble Cedex 9, France
| | - Nicolas Le Poul
- Université de Bretagne Occidentale, CNRS UMR 6521, Laboratoire CEMCA, 6
Avenue Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France
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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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Serrano-Plana J, Costas M, Company A. Building Complexity in O2-Binding Copper Complexes. Site-Selective Metalation and Intermolecular O2-Binding at Dicopper and Heterometallic Complexes Derived from an Unsymmetric Ligand. Inorg Chem 2014; 53:12929-38. [DOI: 10.1021/ic501951f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Joan Serrano-Plana
- Grup de Química Bioinorgànica, Supramolecular
i Catàlisi (QBIS-CAT), Institut de Química Computacional
i Catàlisi (IQCC), Departament de Química, Universitat de Girona, Campus Montilivi, E17071 Girona, Catalonia, Spain
| | - Miquel Costas
- Grup de Química Bioinorgànica, Supramolecular
i Catàlisi (QBIS-CAT), Institut de Química Computacional
i Catàlisi (IQCC), Departament de Química, Universitat de Girona, Campus Montilivi, E17071 Girona, Catalonia, Spain
| | - Anna Company
- Grup de Química Bioinorgànica, Supramolecular
i Catàlisi (QBIS-CAT), Institut de Química Computacional
i Catàlisi (IQCC), Departament de Química, Universitat de Girona, Campus Montilivi, E17071 Girona, Catalonia, Spain
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Porras Gutiérrez AG, Zeitouny J, Gomila A, Douziech B, Cosquer N, Conan F, Reinaud O, Hapiot P, Le Mest Y, Lagrost C, Le Poul N. Insights into water coordination associated with the CuII/CuI electron transfer at a biomimetic Cu centre. Dalton Trans 2014; 43:6436-45. [DOI: 10.1039/c3dt53548g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The coordination chemistry of an aqua Cu complex was investigated in non-coordinating solvents and in ionic liquids.
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Gomila A, Le Poul N, Kerbaol JM, Cosquer N, Triki S, Douziech B, Conan F, Le Mest Y. Electrochemical behavior and dioxygen reactivity of tripodal dinuclear copper complexes linked by unsaturated rigid spacers. Dalton Trans 2013; 42:2238-53. [DOI: 10.1039/c2dt31456h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Garcia-Bosch I, Ribas X, Costas M. Electrophilic arene hydroxylation and phenol O-H oxidations performed by an unsymmetric μ-η(1):η(1)-O2-peroxo dicopper(II) complex. Chemistry 2012; 18:2113-22. [PMID: 22250002 DOI: 10.1002/chem.201102372] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Indexed: 11/09/2022]
Abstract
Reactions of the unsymmetric dicopper(II) peroxide complex [Cu(II)(2)(μ-η(1):η(1)-O(2))(m-XYL(N3N4))](2+) (1 O(2), where m-XYL is a heptadentate N-based ligand), with phenolates and phenols are described. Complex 1 O(2) reacts with p-X-PhONa (X = MeO, Cl, H, or Me) at -90 °C performing tyrosinase-like ortho-hydroxylation of the aromatic ring to afford the corresponding catechol products. Mechanistic studies demonstrate that reactions occur through initial reversible formation of metastable association complexes [Cu(II)(2)(μ-η(1):η(1)-O(2))(p-X-PhO)(m-XYL(N3N4))](+) (1 O(2)⋅X-PhO) that then undergo ortho-hydroxylation of the aromatic ring by the peroxide moiety. Complex 1 O(2) also reacts with 4-X-substituted phenols p-X-PhOH (X = MeO, Me, F, H, or Cl) and with 2,4-di-tert-butylphenol at -90 °C causing rapid decay of 1 O(2) and affording biphenol coupling products, which is indicative that reactions occur through formation of phenoxyl radicals that then undergo radical C-C coupling. Spectroscopic UV/Vis monitoring and kinetic analysis show that reactions take place through reversible formation of ground-state association complexes [Cu(II)(2)(μ-η(1):η(1)-O(2))(X-PhOH)(m-XYL(N3N4))](2+) (1 O(2)⋅X-PhOH) that then evolve through an irreversible rate-determining step. Mechanistic studies indicate that 1 O(2) reacts with phenols through initial phenol binding to the Cu(2)O(2) core, followed by a proton-coupled electron transfer (PCET) at the rate-determining step. Results disclosed in this work provide experimental evidence that the unsymmetric 1 O(2) complex can mediate electrophilic arene hydroxylation and PCET reactions commonly associated with electrophilic Cu(2)O(2) cores, and strongly suggest that the ability to form substrate⋅Cu(2)O(2) association complexes may provide paths to overcome the inherent reactivity of the O(2)-binding mode. This work provides experimental evidence that the presence of a H(+) completely determines the fate of the association complex [Cu(II)(2)(μ-η(1):η(1)-O(2))(X-PhO(H))(m-XYL(N3N4))](n+) between a PCET and an arene hydroxylation reaction, and may provide clues to help understand enzymatic reactions at dicopper sites.
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Affiliation(s)
- Isaac Garcia-Bosch
- QBIS Group, Departament de Química, Universitat de Girona, Campus de Montilivi, 17071 Girona, Catalonia, Spain
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Abstract
Transition-metal complexes of O(2) and N(2) play an important role in the environment, chemical industry, and metalloenzymes. This Perspective compares and contrasts the binding modes, reduction levels, and electronic influences on the nature of the bound O(2) or N(2) group in these complexes. The charge distribution between the metal and the diatomic ligand is variable, and different models for describing the adducts have evolved. In some cases, single resonance structures (e.g. M-superoxide = M-O(2)(-)) are accurate descriptions of the adducts. Recent studies have shown that the magnetic coupling in certain N(2)(2-) complexes differs between resonance forms, and can be used to distinguish experimentally between resonance structures. On the other hand, many O(2) and N(2) complexes cannot be described well with a simple valence-bond model. Defining the situations where ambiguities occur is a fertile area for continued study.
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Affiliation(s)
- Patrick L Holland
- Department of Chemistry, University of Rochester, Rochester, NY 14627, USA
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