1
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Maekawa M, Hayashi T, Sugimoto K, Okubo T, Kuroda-Sowa T. Structural diversity of copper(I)-ethylene complexes with 2,4-bis(2-pyridyl)pyrimidine directed by anions. Dalton Trans 2023; 52:14941-14948. [PMID: 37800189 DOI: 10.1039/d3dt02618c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
The 3 : 1 reaction of [Cu(C2H4)n]ClO4 with 2,4-bis(2-pyridyl)pyrimidine (bpprd) in Me2CO under C2H4 afforded yellow prism crystals of the dinuclear Cu(I)-C2H4 complex [Cu2(bpprd)(η2-C2H4)2(ClO4)2] (1). The 3 : 1 reaction of [Cu(C2H4)n]NO3 with bpprd in Me2CO under C2H4 afforded yellow plate crystals of the tetranuclear Cu(I)-C2H4 complex [Cu4(bpprd)2(η2-C2H4)4(μ-NO3)2](NO3)2 (2). The 10 : 1 reaction of [Cu(C2H4)n]BF4 with bpprd in Me2CO under C2H4 afforded yellow plate crystals of the dinuclear Cu(I)-C2H4 complex [Cu2(bpprd)(η2-C2H4)2(BF4)]BF4 (3). The 3 : 1 reaction of [Cu(C2H4)n]BF4 with bpprd in Me2CO under C2H4 afforded red prism crystals of the polymeric Cu(I)-C2H4 complex {[Cu6(bpprd)4(η2-C2H4)2(μ-η2:η2-C2H4)(μ-BF4)2](BF4)4}n (4). The X-ray crystal structures of complexes 1-4 have been determined. The structural diversity of Cu(I)-C2H4 complexes bridged by bpprd with different anions was demonstrated. The 1D Cu(I)-bpprd/C2H4 coordination polymer 4 bridged by unusual μ-η2:η2-C2H4 and the μ-BF4- anion is of particular significance. Complex 1 exhibited relatively well-resolved 1H NMR signals of bpprd and C2H4 (δ = 4.97 ppm) in (CD3)2CO at 23 °C.
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Affiliation(s)
- Masahiko Maekawa
- Research Institute for Science and Technology, Kindai University, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan.
| | - Terumasa Hayashi
- Department of Chemistry, Kindai University, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Kunihisa Sugimoto
- Department of Chemistry, Kindai University, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Takashi Okubo
- Department of Chemistry, Kindai University, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Takayoshi Kuroda-Sowa
- Department of Chemistry, Kindai University, Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
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2
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Cutsail G, Schott-Verdugo S, Müller L, DeBeer S, Groth G, Gohlke H. Spectroscopic and QM/MM studies of the Cu(I) binding site of the plant ethylene receptor ETR1. Biophys J 2022; 121:3862-3873. [PMID: 36086818 PMCID: PMC9674993 DOI: 10.1016/j.bpj.2022.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 08/17/2022] [Accepted: 09/06/2022] [Indexed: 11/15/2022] Open
Abstract
Herein, we present, to our knowledge, the first spectroscopic characterization of the Cu(I) active site of the plant ethylene receptor ETR1. The x-ray absorption (XAS) and extended x-ray absorption fine structure (EXAFS) spectroscopies presented here establish that ETR1 has a low-coordinate Cu(I) site. The EXAFS resolves a mixed first coordination sphere of N/O and S scatterers at distances consistent with potential histidine and cysteine residues. This finding agrees with the coordination of residues C65 and H69 to the Cu(I) site, which are critical for ethylene activity and well conserved. Furthermore, the Cu K-edge XAS and EXAFS of ETR1 exhibit spectroscopic changes upon addition of ethylene that are attributed to modifications in the Cu(I) coordination environment, suggestive of ethylene binding. Results from umbrella sampling simulations of the proposed ethylene binding helix of ETR1 at a mixed quantum mechanics/molecular mechanics level agree with the EXAFS fit distance changes upon ethylene binding, particularly in the increase of the distance between H69 and Cu(I), and yield binding energetics comparable with experimental dissociation constants. The observed changes in the copper coordination environment might be the triggering signal for the transmission of the ethylene response.
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Affiliation(s)
- George Cutsail
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany; Institute of Inorganic Chemistry, University of Duisburg-Essen, Universitätsstrasse 7, Essen, Germany
| | - Stephan Schott-Verdugo
- John von Neumann Institute for Computing (NIC), Jülich Supercomputing Centre (JSC), Institute of Biological Information Processing (IBI-7: Structural Bioinformatics), and Institute of Bio- and Geosciences (IBG-4: Bioinformatics), Forschungszentrum Jülich GmbH, Jülich, Germany
| | - Lena Müller
- Institut für Biochemische Pflanzenphysiologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr, Germany
| | - Georg Groth
- Institut für Biochemische Pflanzenphysiologie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Holger Gohlke
- John von Neumann Institute for Computing (NIC), Jülich Supercomputing Centre (JSC), Institute of Biological Information Processing (IBI-7: Structural Bioinformatics), and Institute of Bio- and Geosciences (IBG-4: Bioinformatics), Forschungszentrum Jülich GmbH, Jülich, Germany; Institut für Pharmazeutische und Medizinische Chemie, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany.
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3
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Karimata A, Gridneva T, Patil PH, Fayzullin RR, Khaskin E, Lapointe S, Garcia-Roca A, Khusnutdinova JR. Ethylene binding in mono- and binuclear Cu I complexes with tetradentate pyridinophane ligands. Dalton Trans 2022; 51:13426-13434. [PMID: 35993504 DOI: 10.1039/d2dt02180c] [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
Herein we report a series of CuI complexes supported by tetradentate RN4 pyridinophane ligands that coordinate to ethylene forming either mononuclear complexes with ethylene coordinated in an η2-mode or a binuclear complex where ethylene binds to two Cu atoms in a μ-η2-η2-mode, depending on the steric effects of the RN4 ligand and the reaction conditions. In the binuclear complex with bridging ethylene, the CC bond is significantly elongated, with a bond length of 1.444(8) Å according to X-ray diffraction analysis. This complex represents the only examination a μ-η2-η2-coordinated Cu-olefin complex reported to date, featuring one of the longest reported CC bonds. The spectroscopic characterization, structure, electrochemical properties and solution behavior are analyzed in this study. Coordination of ethylene was found to be reversible in these complexes and more favored in less sterically hindered RN4 ligands, so that ethylene binding is observed in a coordinating solvent (MeCN) environment. In the case of the MeN4 ligand, the ethylene complex is photoluminescent in the solid state. The ethylene binding modes in mono- and binuclear complexes are elucidated through Natural Bond Orbital and QTAIM analyses.
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Affiliation(s)
- Ayumu Karimata
- Okinawa Institute of Science and Technology Graduate University, Coordination Chemistry and Catalysis Unit, 1919-1 Tancha, Onna-son, Okinawa, 904-0495, Japan.
| | - Tatiana Gridneva
- Okinawa Institute of Science and Technology Graduate University, Coordination Chemistry and Catalysis Unit, 1919-1 Tancha, Onna-son, Okinawa, 904-0495, Japan.
| | - Pradnya H Patil
- Okinawa Institute of Science and Technology Graduate University, Coordination Chemistry and Catalysis Unit, 1919-1 Tancha, Onna-son, Okinawa, 904-0495, Japan.
| | - Robert R Fayzullin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Street, Kazan 420088, Russian Federation
| | - Eugene Khaskin
- Okinawa Institute of Science and Technology Graduate University, Coordination Chemistry and Catalysis Unit, 1919-1 Tancha, Onna-son, Okinawa, 904-0495, Japan.
| | - Sébastien Lapointe
- Okinawa Institute of Science and Technology Graduate University, Coordination Chemistry and Catalysis Unit, 1919-1 Tancha, Onna-son, Okinawa, 904-0495, Japan.
| | - Alèria Garcia-Roca
- Okinawa Institute of Science and Technology Graduate University, Coordination Chemistry and Catalysis Unit, 1919-1 Tancha, Onna-son, Okinawa, 904-0495, Japan.
| | - Julia R Khusnutdinova
- Okinawa Institute of Science and Technology Graduate University, Coordination Chemistry and Catalysis Unit, 1919-1 Tancha, Onna-son, Okinawa, 904-0495, Japan.
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4
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Peralta RA, Huxley MT, Albalad J, Sumby CJ, Doonan CJ. Single-Crystal-to-Single-Crystal Transformations of Metal-Organic-Framework-Supported, Site-Isolated Trigonal-Planar Cu(I) Complexes with Labile Ligands. Inorg Chem 2021; 60:11775-11783. [PMID: 34160208 DOI: 10.1021/acs.inorgchem.1c00849] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Transition-metal complexes bearing labile ligands can be difficult to isolate and study in solution because of unwanted dinucleation or ligand substitution reactions. Metal-organic frameworks (MOFs) provide a unique matrix that allows site isolation and stabilization of well-defined transition-metal complexes that may be of importance as moieties for gas adsorption or catalysis. Herein we report the development of an in situ anion metathesis strategy that facilitates the postsynthetic modification of Cu(I) complexes appended to a porous, crystalline MOF. By exchange of coordinated chloride for weakly coordinating anions in the presence of carbon monoxide (CO) or ethylene, a series of labile MOF-appended Cu(I) complexes featuring CO or ethylene ligands are prepared and structurally characterized using X-ray crystallography. These complexes have an uncommon trigonal planar geometry because of the absence of coordinating solvents. The porous host framework allows small and moderately sized molecules to access the isolated Cu(I) sites and displace the "place-holder" CO ligand, mirroring the ligand-exchange processes involved in Cu-centered catalysis.
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Affiliation(s)
- Ricardo A Peralta
- Centre for Advanced Nanomaterials and Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5000, Australia
| | - Michael T Huxley
- Centre for Advanced Nanomaterials and Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5000, Australia
| | - Jorge Albalad
- Centre for Advanced Nanomaterials and Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5000, Australia
| | - Christopher J Sumby
- Centre for Advanced Nanomaterials and Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5000, Australia
| | - Christian J Doonan
- Centre for Advanced Nanomaterials and Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5000, Australia
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5
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Reichel M, Wurzenberger MHH, Lommel M, Kofen M, Krumm B, Stierstorfer J, Karaghiosoff K. N
‐Fluoromethylated (Amino)Tetrazoles: Manipulating Thermal and Energetic Properties. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000341] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Marco Reichel
- Department of Chemistry LudwigMaximilian University of Munich Butenandtstr. 5–13 (D) 81377 Munich Germany
| | | | - Marcus Lommel
- Department of Chemistry LudwigMaximilian University of Munich Butenandtstr. 5–13 (D) 81377 Munich Germany
| | - Moritz Kofen
- Department of Chemistry LudwigMaximilian University of Munich Butenandtstr. 5–13 (D) 81377 Munich Germany
| | - Burkhard Krumm
- Department of Chemistry LudwigMaximilian University of Munich Butenandtstr. 5–13 (D) 81377 Munich Germany
| | - Jörg Stierstorfer
- Department of Chemistry LudwigMaximilian University of Munich Butenandtstr. 5–13 (D) 81377 Munich Germany
| | - Konstantin Karaghiosoff
- Department of Chemistry LudwigMaximilian University of Munich Butenandtstr. 5–13 (D) 81377 Munich Germany
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6
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O'Dea C, Ugarte Trejo O, Arras J, Ehnbom A, Bhuvanesh N, Stollenz M. Ethylene-Bridged Hexadentate Bis(amidines) and Bis(amidinates) with Variable Binding Sites. J Org Chem 2019; 84:14217-14226. [PMID: 31560534 DOI: 10.1021/acs.joc.9b01908] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Hexadentate bis(amidines) form versatile networks of hydrogen bonds both in solid state and solution, as revealed by X-ray crystallography, IR, and NMR spectroscopy. Moreover, the corresponding bis(amidinates) produce blue and green emissions in THF solution. Tethered tetradentate bis(amidines) have emerged in coordination chemistry, enantioselective catalysis, as building blocks for polyfunctional heterocycles, and in photoluminescent materials. The next generation of flexible bis(amidine)/bis(amidinate) platforms with up to six N-donor sites has now been established.
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Affiliation(s)
- Connor O'Dea
- Department of Chemistry and Biochemistry , Kennesaw State University , 370 Paulding Avenue NW , MD #1203, Kennesaw , Georgia 30144 , United States
| | - Omar Ugarte Trejo
- Department of Chemistry and Biochemistry , Kennesaw State University , 370 Paulding Avenue NW , MD #1203, Kennesaw , Georgia 30144 , United States
| | - Janet Arras
- Department of Chemistry and Biochemistry , Kennesaw State University , 370 Paulding Avenue NW , MD #1203, Kennesaw , Georgia 30144 , United States
| | - Andreas Ehnbom
- Department of Chemistry , Texas A&M University , 580 Ross Street , P.O. Box 30012, College Station , Texas 77842-3012 , United States
| | - Nattamai Bhuvanesh
- Department of Chemistry , Texas A&M University , 580 Ross Street , P.O. Box 30012, College Station , Texas 77842-3012 , United States
| | - Michael Stollenz
- Department of Chemistry and Biochemistry , Kennesaw State University , 370 Paulding Avenue NW , MD #1203, Kennesaw , Georgia 30144 , United States
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7
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Guo Z, Liu F, Tong H, Chao J, Wang H, Zhou M. 1,3,5-Triazapentadienyltin(II) complexes and the additional reaction of phenylamine with N,N'-diisopropylcarbodiimide. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.05.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Ponduru TT, Qiu C, Mao JX, Leghissa A, Smuts J, Schug KA, Dias HVR. Copper(i)-based oxidation of polycyclic aromatic hydrocarbons and product elucidation using vacuum ultraviolet spectroscopy and theoretical spectral calculations. NEW J CHEM 2018. [DOI: 10.1039/c8nj04740e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorinated 1,3,5-triazapentadienyl complexes of copper catalyze the oxidation PAHs to quinones using H2O2as an oxidant under mild conditions.
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Affiliation(s)
- Tharun T. Ponduru
- Department of Chemistry and Biochemistry
- The University of Texas at Arlington
- Arlington
- USA
| | - Changling Qiu
- Department of Chemistry and Biochemistry
- The University of Texas at Arlington
- Arlington
- USA
| | - James X. Mao
- Department of Chemistry and Biochemistry
- The University of Texas at Arlington
- Arlington
- USA
| | - Allegra Leghissa
- Department of Chemistry and Biochemistry
- The University of Texas at Arlington
- Arlington
- USA
| | | | - Kevin A. Schug
- Department of Chemistry and Biochemistry
- The University of Texas at Arlington
- Arlington
- USA
| | - H. V. Rasika Dias
- Department of Chemistry and Biochemistry
- The University of Texas at Arlington
- Arlington
- USA
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9
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Ridlen SG, Kulkarni NV, Dias HVR. Monoanionic, Bis(pyrazolyl)methylborate [(Ph 3B)CH(3,5-(CH 3) 2Pz) 2)] - as a Supporting Ligand for Copper(I)-ethylene, cis-2-Butene, and Carbonyl Complexes. Inorg Chem 2017; 56:7237-7246. [PMID: 28541048 DOI: 10.1021/acs.inorgchem.7b00878] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The monoanionic bidentate ligand [(Ph3B)CH(3,5-(CH3)2Pz)2)]- has been prepared from lithium bis(pyrazolyl)methanide and triphenylborane. This useful new ligand is closely related to the well-established bis(pyrazolyl)borate and bis(pyrazolyl)methane ligands but has key differences to both analogues as well. The ethylene, cis-2-butene, and carbon monoxide adducts [(Ph3B)CH(3,5-(CH3)2Pz)2]Cu(L) (where L = C2H4, cis-CH3HC═CHCH3, and CO) have been prepared from [(Ph3B)CH(3,5-(CH3)2Pz)2)]Li(THF), copper(I) triflate, and the corresponding coligand. These complexes have been characterized by NMR spectroscopy and X-ray crystallography. In all cases the bis(pyrazolyl) moiety is bound in κ2N fashion with the BPh3 group rotated to sit over the metal center, sometimes coordinating to the metal via phenyl carbons as in [(Ph3B)CH(3,5-(CH3)2Pz)2)]Li(THF) and [(Ph3B)CH(3,5-(CH3)2Pz)2]Cu(CO) or simply hovering above the metal site as in [(Ph3B)CH(3,5-(CH3)2Pz)2)]Cu(C2H4) and [(Ph3B)CH(3,5-(CH3)2Pz)2)]Cu(cis-CH3HC═CHCH3). The 13C and 1H resonances of the ethylene carbon and protons of [(Ph3B)CH(3,5-(CH3)2Pz)2)]Cu(C2H4) appear at δ 81.0 and 3.71 ppm in CD2Cl2, respectively. The characteristic CO frequency for [(Ph3B)CH(3,5-(CH3)2Pz)2]Cu(CO) has been observed at υ̅ 2092 cm-1 by infrared spectroscopy and is lower than that of free CO suggesting moderate M → CO π-back-donation. A detailed analysis of these complexes has been presented herein.
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Affiliation(s)
- Shawn G Ridlen
- Department of Chemistry and Biochemistry, The University of Texas at Arlington , Arlington, Texas 76019, United States
| | - Naveen V Kulkarni
- Department of Chemistry and Biochemistry, The University of Texas at Arlington , Arlington, Texas 76019, United States
| | - H V Rasika Dias
- Department of Chemistry and Biochemistry, The University of Texas at Arlington , Arlington, Texas 76019, United States
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10
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Light KM, Wisniewski JA, Vinyard WA, Kieber-Emmons MT. Perception of the plant hormone ethylene: known-knowns and known-unknowns. J Biol Inorg Chem 2016; 21:715-28. [DOI: 10.1007/s00775-016-1378-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 07/19/2016] [Indexed: 12/18/2022]
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11
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Bellows SM, Brennessel WW, Holland PL. Effects of Ligand Halogenation on the Electron Localization, Geometry and Spin State of Low-Coordinate (β-Diketiminato)iron Complexes. Eur J Inorg Chem 2016; 2016:3344-3355. [PMID: 28835739 PMCID: PMC5563838 DOI: 10.1002/ejic.201600112] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Indexed: 11/05/2022]
Abstract
This contribution explores the influences of incorporating electron-withdrawing CF3 and halide groups into β-diketiminate iron complexes of tetrazene and isocyanide. The synthesis of a new halogenated β-diketimine (LCF3,ClH) was accomplished via two different methods, including a novel microwave-assisted synthesis that improves the yield of the difficult condensation. Treatment of an iron(II) complex of this ligand with reductant and azide gives two diiron complexes with novel tetrazenes as bridging ligands. Structural and Mössbauer data show that the bridging tetrazene is a radical anion. The halogenation of the supporting ligand also influences iron(I) complexes of the type LFe(CNtBu)2, which are low-spin and square-planar with alkyl substituents but high-spin and pseudotetrahedral with halogen substituents. DFT calculations suggest that the changes from halogenation come from a combination of steric and electronic effects, and that the electronic influence of ligand halogenation is minor.
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Affiliation(s)
- Sarina M Bellows
- Department of Chemistry, University of Rochester, 120 Trustee Rd, Rochester, NY 14627 USA
| | - William W Brennessel
- Department of Chemistry, University of Rochester, 120 Trustee Rd, Rochester, NY 14627 USA
| | - Patrick L Holland
- Department of Chemistry, Yale University 225, Prospect St, New Haven, CT 06520 USA, Homepage: http://holland.chem.yale.edu
- Department of Chemistry, University of Rochester, 120 Trustee Rd, Rochester, NY 14627 USA
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12
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Kulkarni NV, Das A, Ridlen SG, Maxfield E, Adiraju VAK, Yousufuddin M, Dias HVR. Fluorinated triazapentadienyl ligand supported ethyl zinc(ii) complexes: reaction with dioxygen and catalytic applications in the Tishchenko reaction. Dalton Trans 2016; 45:4896-906. [PMID: 26875862 DOI: 10.1039/c6dt00257a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ethyl zinc complexes [N{(C3F7)C(Dipp)N}2]ZnEt, [N{(C3F7)C(Cy)N}2]ZnEt, [N{(CF3)C(2,4,6-Br3C6H2)N}2]ZnEt and [N{(C3F7)C(2,6-Cl2C6H3)N}2]ZnEt have been synthesized from the corresponding 1,3,5-triazapentadiene and diethyl zinc. X-ray data show that [N{(C3F7)C(Dipp)N}2]ZnEt has a distorted trigonal planar geometry at the zinc center. The triazapentadienyl ligand binds to zinc in a κ(2)-mode. The zinc-ethyl bonds of [N{(C3F7)C(Dipp)N}2]ZnEt, [N{(C3F7)C(Cy)N}2]ZnEt, [N{(CF3)C(2,4,6-Br3C6H2)N}2]ZnEt and [N{(C3F7)C(2,6-Cl2C6H3)N}2]ZnEt readily undergo oxygen insertion upon exposure to dry air to produce the corresponding zinc-ethoxy or zinc-ethylperoxy compounds. The ethoxy zinc adducts {[N{(CF3)C(2,4,6-Br3C6H2)N}2]ZnOEt}2 and {[N{(C3F7)C(2,6-Cl2C6H3)N}2]ZnOEt}2 as well as the ethylperoxy zinc adduct {[N{(C3F7)C(Cy)N}2]ZnOOEt}2 have been isolated and fully characterized by several methods including X-ray crystallography. They feature dinuclear structures with four-coordinate zinc sites and bridging-ethoxy or -ethylperoxy groups. The ethyl zinc complexes catalyze the Tishchenko reaction of benzaldehyde under solventless conditions affording benzyl benzoate. The reaction of ethyl zinc complexes with dioxygen and their catalytic behaviour in the Tishchenko reaction are affected by the electronic and steric factors of the triazapentadienyl ligand. {[N{(C3F7)C(Cy)N}2]ZnOOEt}2 is an excellent reagent for the epoxidation of trans-chalcone.
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Affiliation(s)
- Naveen V Kulkarni
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, USA.
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13
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Glotzbach C, Gödeke N, Fröhlich R, Daniliuc CG, Saito S, Yamaguchi S, Würthwein EU. Fluorescent benzene-centered mono-, bis- and tris-triazapentadiene–boron complexes. Dalton Trans 2015; 44:9659-71. [DOI: 10.1039/c5dt00908a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Chang MC, Roewen P, Travieso-Puente R, Lutz M, Otten E. Formazanate Ligands as Structurally Versatile, Redox-Active Analogues of β-Diketiminates in Zinc Chemistry. Inorg Chem 2014; 54:379-88. [DOI: 10.1021/ic5025873] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mu-Chieh Chang
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Peter Roewen
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Raquel Travieso-Puente
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Martin Lutz
- Bijvoet
Center for Biomolecular Research, Crystal and Structural Chemistry, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Edwin Otten
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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15
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Lake BRM, Willans CE. Structural diversity of copper(I)-N-heterocyclic carbene complexes; ligand tuning facilitates isolation of the first structurally characterised copper(I)-NHC containing a copper(I)-alkene interaction. Chemistry 2013; 19:16780-90. [PMID: 24203461 DOI: 10.1002/chem.201301896] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Indexed: 11/07/2022]
Abstract
The preparation of a series of imidazolium salts bearing N-allyl substituents, and a range of substituents on the second nitrogen atom that have varying electronic and steric properties, is reported. The ligands have been coordinated to a copper(I) centre and the resulting copper(I)-NHC (NHC=N-heterocyclic carbene) complexes have been thoroughly examined, both in solution and in the solid-state. The solid-state structures are highly diverse and exhibit a range of unusual geometries and cuprophilic interactions. The first structurally characterised copper(I)-NHC complex containing a copper(I)-alkene interaction is reported. An N-pyridyl substituent, which forms a dative bond with the copper(I) centre, stabilises an interaction between the metal centre and the allyl substituent of a neighbouring ligand, to form a 1D coordination polymer. The stabilisation is attributed to the pyridyl substituent increasing the electron density at the copper(I) centre, and thus enhancing the metal(d)-to-alkene(π*) back-bonding. In addition, components other than charge transfer appear to have a role in copper(I)-alkene stabilisation because further increases in the Lewis basicity of the ligand disfavours copper(I)-alkene binding.
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Affiliation(s)
- Benjamin R M Lake
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9 JT (UK), Fax: (+44) 1133436565
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16
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Lassauque N, Gualco P, Mallet-Ladeira S, Miqueu K, Amgoune A, Bourissou D. Activation of a σ-SnSn Bond at Copper, Followed by Double Addition to an Alkyne. J Am Chem Soc 2013; 135:13827-34. [DOI: 10.1021/ja405516j] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Nicolas Lassauque
- Laboratoire
Hétérochimie Fondamentale Appliquée, Université de Toulouse, UPS,
CNRS, LHFA UMR 5069, 118 route de Narbonne, F-31062 Toulouse, France
| | - Pauline Gualco
- Laboratoire
Hétérochimie Fondamentale Appliquée, Université de Toulouse, UPS,
CNRS, LHFA UMR 5069, 118 route de Narbonne, F-31062 Toulouse, France
| | - Sonia Mallet-Ladeira
- Structure
Fédérative Toulousaine en Chimie Moléculaire, FR2599, Université de Toulouse, UPS, 118 Route de Narbonne, F-31062 Toulouse, France
| | - Karinne Miqueu
- Institut
Pluridisciplinaire de Recherche sur l’Environnement et les
Matériaux (UMR 5254), Equipe Chimie Physique, Université de Pau et des Pays de l’Adour, Hélioparc, 2 Avenue du Président
Angot, 64053 Pau
cedex 09, France
| | - Abderrahmane Amgoune
- Laboratoire
Hétérochimie Fondamentale Appliquée, Université de Toulouse, UPS,
CNRS, LHFA UMR 5069, 118 route de Narbonne, F-31062 Toulouse, France
| | - Didier Bourissou
- Laboratoire
Hétérochimie Fondamentale Appliquée, Université de Toulouse, UPS,
CNRS, LHFA UMR 5069, 118 route de Narbonne, F-31062 Toulouse, France
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17
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Ebrahimpour P, Haddow MF, Wass DF. New Cu(I)-Ethylene Complexes Based on Tridentate Imine Ligands: Synthesis and Structure. Inorg Chem 2013; 52:3765-71. [DOI: 10.1021/ic302325u] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Parisa Ebrahimpour
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol
BS8 1TS, U.K
| | - Mairi F. Haddow
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol
BS8 1TS, U.K
| | - Duncan F. Wass
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol
BS8 1TS, U.K
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18
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Das A, Dash C, Celik MA, Yousufuddin M, Frenking G, Dias HVR. Tris(alkyne) and Bis(alkyne) Complexes of Coinage Metals: Synthesis and Characterization of (cyclooctyne)3M+ (M = Cu, Ag) and (cyclooctyne)2Au+ and Coinage Metal (M = Cu, Ag, Au) Family Group Trends. Organometallics 2013. [DOI: 10.1021/om400073a] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Animesh Das
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Chandrakanta Dash
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Mehmet Ali Celik
- Fachbereich Chemie, Philipps-Universität Marburg,
D-35039 Marburg, Germany
| | - Muhammed Yousufuddin
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Gernot Frenking
- Fachbereich Chemie, Philipps-Universität Marburg,
D-35039 Marburg, Germany
| | - H. V. Rasika Dias
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, United States
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19
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Dash C, Das A, Yousufuddin M, Dias HVR. Isolable, copper(I) dicarbonyl complexes supported by N-heterocyclic carbenes. Inorg Chem 2013; 52:1584-90. [PMID: 23339443 DOI: 10.1021/ic302455y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Cationic copper(I) dicarbonyl complexes supported by N-heterocyclic carbene ligands, SIPr and IPr*, have been synthesized. [(SIPr)Cu(CO)(2)][SbF(6)] and [(IPr*)Cu(CO)(2)][SbF(6)] have a trigonal planar, three-coordinate copper atom with an average Cu-CO distance of 1.915 Å and display C-O stretching frequencies higher than that of the free CO (2143 cm(-1)). The high CO stretching frequencies suggest that the Cu(I)-CO interaction in these cationic adducts is dominated by electrostatic and OC → Cu σ-donor components. [(SIPr)Cu(CO)(2)][SbF(6)] and [(IPr*)Cu(CO)(2)][SbF(6)] readily form the corresponding [(SIPr)Cu(CO)(H(2)O)][SbF(6)] and [(IPr*)Cu(CO)(H(2)O)][SbF(6)] with loss of a CO even with traces of water, but they can be converted back to the dicarbonyl adducts using excess CO. The synthesis and structure of [(IPr*)Cu(H(2)O)][SbF(6)] are also reported. It is a two-coordinate copper adduct with a Cu-O distance of 1.874(2) Å. It reacts with excess CO to form [(IPr*)Cu(CO)(2)][SbF(6)].
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Affiliation(s)
- Chandrakanta Dash
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019-0065, USA
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