1
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Dörr J, Alahmadi AF, Henkelmann M, Bolte M, Lerner HW, Wagner M, Jäkle F. Oligomerization of an ansa-ferrocene with pyrazabole bridge. CAN J CHEM 2022. [DOI: 10.1139/cjc-2022-0109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Ansa-ferrocenes with pyrazabole bridges are chemically robust entities and therefore suitable building blocks for the synthesis of rigid-rod polymers that combine redox-active Fe(II) centers and beltene-like faces. The specific monomers we developed bear OEt groups at both tetracoordinated boron atoms (for solubility reasons) and ethynyl substituents at the 4-positions of the two pyrazole rings. Polymerization was accomplished by a condensation reaction with 1,4-diiodobenzene using a Sonogashira-Hagihara-type protocol. Thereby, oligomers with a number-average molecular weight of Mn = 7.6 kDa and dispersity of Ð = 1.55 were obtained, suggesting an average chain length of about 14 repeating units based on gel permeation chromatography (GPC) analysis in THF relative to narrow polystyrene standards. The molecular-weight determination was complemented by MALDI-TOF mass spectrometry and (heteronuclear) NMR spectroscopy to verify the intact pyrazabole monomer repeat units and the nature of the end-groups. The oligomers were further characterized by UV−vis spectroscopy and cyclic voltammetry, which demonstrated the successful synthesis of a new class of redox-active materials.
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Affiliation(s)
- Jonas Dörr
- Johann Wolfgang Goethe-Universität Frankfurt am Main, 9173, Department of Chemistry, Frankfurt am Main, Hessen, Germany
- Rutgers University Newark, 67206, Department of Chemistry, Newark, New Jersey, United States
| | | | - Marcel Henkelmann
- Johann Wolfgang Goethe-Universität Frankfurt am Main, 9173, Department of Chemistry, Frankfurt am Main, Hessen, Germany
| | - Michael Bolte
- Johann Wolfgang Goethe-Universität Frankfurt am Main, 9173, Department of Chemistry, Frankfurt am Main, Hessen, Germany
| | - Hans-Wolfram Lerner
- Johann Wolfgang Goethe-Universität Frankfurt am Main, 9173, Department of Chemistry, Frankfurt am Main, Hessen, Germany
| | - Matthias Wagner
- Johann Wolfgang Goethe-Universität Frankfurt am Main, 9173, Department of Chemistry, Frankfurt am Main, Hessen, Germany
| | - Frieder Jäkle
- Rutgers University Newark, 67206, Department of Chemistry, Newark, New Jersey, United States
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2
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Budy H, Gilmer J, Trageser T, Wagner M. Anionic Organoboranes: Delicate Flowers Worth Caring for. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000786] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Hendrik Budy
- Institut für Anorganische Chemie Goethe‐Universität Frankfurt Max‐von‐Laue‐Str. 7 60438 Frankfurt (Main) Germany
| | - Jannik Gilmer
- Institut für Anorganische Chemie Goethe‐Universität Frankfurt Max‐von‐Laue‐Str. 7 60438 Frankfurt (Main) Germany
| | - Timo Trageser
- Institut für Anorganische Chemie Goethe‐Universität Frankfurt Max‐von‐Laue‐Str. 7 60438 Frankfurt (Main) Germany
| | - Matthias Wagner
- Institut für Anorganische Chemie Goethe‐Universität Frankfurt Max‐von‐Laue‐Str. 7 60438 Frankfurt (Main) Germany
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3
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Lohrey TD, Rao G, Small DW, Ouellette ET, Bergman RG, Britt RD, Arnold J. Electronic Structures of Rhenium(II) β-Diketiminates Probed by EPR Spectroscopy: Direct Comparison of an Acceptor-Free Complex to Its Dinitrogen, Isocyanide, and Carbon Monoxide Adducts. J Am Chem Soc 2020; 142:13805-13813. [PMID: 32786815 DOI: 10.1021/jacs.0c04719] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Electron paramagnetic resonance (EPR) studies of the rhenium(II) complex Re(η5-Cp)(BDI) (1; BDI = N,N'-bis(2,6-diisopropylphenyl)-3,5-dimethyl-β-diketiminate) have revealed that this species reversibly binds N2 in solution: flash frozen toluene solutions of 1 disclose entirely different EPR spectra at 10 K when prepared under N2 versus Ar atmospheres. This observation was additionally verified by the synthesis of stable CO and 2,6-xylylisocyanide (XylNC) adducts of 1, which display EPR features akin to those observed in the putative N2 complex. While we found that 1 displays an extremely large gmax value of 3.99, the binding of an additional ligand leads to substantial decreases in this value, displaying gmax values of ca. 2.4. Following the generation of isotopically enriched 15N2 and 13CO adducts of 1, HYSCORE experiments allowed for the measurement of the corresponding hyperfine couplings associated with spin delocalization onto the electron-accepting ligands in these species, which proved to be small. A cumulative assessment of the EPR data, when combined with insights provided by near-infrared (NIR) spectroscopy and time-dependent density functional theory (TDDFT) calculations, indicated that while the binding of electron acceptors to 1 does lead to decreases in gmax in relative accord with the field strength (i.e., π-acidity) of the variable ligand, the magnitude of these decreases is primarily due to the changes in electronic structure at the Re center.
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Affiliation(s)
- Trevor D Lohrey
- Department of Chemistry, University of California, Berkeley, California 94720, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Guodong Rao
- Department of Chemistry, University of California, Davis, California 95616, United States
| | - David W Small
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Erik T Ouellette
- Department of Chemistry, University of California, Berkeley, California 94720, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Robert G Bergman
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - R David Britt
- Department of Chemistry, University of California, Davis, California 95616, United States
| | - John Arnold
- Department of Chemistry, University of California, Berkeley, California 94720, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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4
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Ghadwal RS, Schürmann CJ, Andrada DM, Frenking G. Mono- and di-cationic hydrido boron compounds. Dalton Trans 2015. [DOI: 10.1039/c5dt02237a] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Stable mono- and di-cationic hydrido boron compounds featuring CH2BH2(μ-H)BH2CH2 and CH2BH(μ-H)2BHCH2 cores are readily accessible by dehydrogenative hydride abstractions. NBO calculations revealed the occurrence of two B–H–B 3c–2e bonds in the HB(μ-H)2BH moiety of di-cations (7 and 8), where 43% is located at the H bridges and ∼28% at each boron atom.
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Affiliation(s)
- Rajendra S. Ghadwal
- Institut für Anorganische Chemie
- Universität Bielefeld
- 33615 Bielefeld
- Germany
- Institut für Anorganische Chemie der Georg-August-Universität Göttingen
| | - Christian J. Schürmann
- Institut für Anorganische Chemie der Georg-August-Universität Göttingen
- 37077 Göttingen
- Germany
| | - Diego M. Andrada
- Fachbereich Chemie
- Philipps-Universität Marburg
- 35032 Marburg
- Germany
| | - Gernot Frenking
- Fachbereich Chemie
- Philipps-Universität Marburg
- 35032 Marburg
- Germany
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5
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Braunschweig H, Jimenez-Halla JOC, Radacki K, Shang R. A metal-mediated boron-centred isomerisation reaction via C–H activation. Chem Commun (Camb) 2015; 51:16569-72. [DOI: 10.1039/c5cc07681a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The terminal borylene ligand is activated by Lewis bases to couple with terminal carbonyl ligands reversibly, initially forming a kinetic coupling product, which isomerises via a borylene migratory insertion to a cyclopentadienyl ligand C–H bond.
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Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
| | - J. Oscar C. Jimenez-Halla
- Department of Chemistry
- Division of Natural and Exact Sciences
- University of Guanajuato
- 36050 Guanajuato
- Mexico
| | - Krzysztof Radacki
- Institut für Anorganische Chemie
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
| | - Rong Shang
- Institut für Anorganische Chemie
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
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6
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Breunig JM, Lehmann F, Bolte M, Lerner HW, Wagner M. Synthesis and Reactivity of o-Phosphane Oxide Substituted Aryl(hydro)borates and Aryl(hydro)boranes. Organometallics 2014. [DOI: 10.1021/om500385h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Jens Michael Breunig
- Institut
für Anorganische und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Felix Lehmann
- Institut
für Anorganische und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Michael Bolte
- Institut
für Anorganische und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Hans-Wolfram Lerner
- Institut
für Anorganische und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Matthias Wagner
- Institut
für Anorganische und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
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7
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Bentivegna B, Mariani CI, Smith JR, Ma S, Rheingold AL, Brunker TJ. Formation, Stability, and Structures of Borenium and Boronium Cations Derived from Pentamethylazaferrocene–Boranes by Hydride or Chloride Abstraction Reactions. Organometallics 2014. [DOI: 10.1021/om500348u] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- BriAnne Bentivegna
- Department of Chemistry,
Jess and Mildred Fisher
College of Science and Mathematics, Towson University, 8000 York
Road, Towson, Maryland 21252, United States
| | - Christine I. Mariani
- Department of Chemistry,
Jess and Mildred Fisher
College of Science and Mathematics, Towson University, 8000 York
Road, Towson, Maryland 21252, United States
| | - Jason R. Smith
- Department of Chemistry,
Jess and Mildred Fisher
College of Science and Mathematics, Towson University, 8000 York
Road, Towson, Maryland 21252, United States
| | - Shuhua Ma
- Department of Chemistry,
Jess and Mildred Fisher
College of Science and Mathematics, Towson University, 8000 York
Road, Towson, Maryland 21252, United States
| | - Arnold L. Rheingold
- Department of Chemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Tim J. Brunker
- Department of Chemistry,
Jess and Mildred Fisher
College of Science and Mathematics, Towson University, 8000 York
Road, Towson, Maryland 21252, United States
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8
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Seven Ö, Bolte M, Lerner HW, Wagner M. High-Yield Syntheses and Reactivity Studies of 1,2-Diborylated and 1,2,4,5-Tetraborylated Benzenes. Organometallics 2014. [DOI: 10.1021/om500104w] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Ömer Seven
- Institut für Anorganische
und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse
7, D-60438 Frankfurt (Main), Germany
| | - Michael Bolte
- Institut für Anorganische
und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse
7, D-60438 Frankfurt (Main), Germany
| | - Hans-Wolfram Lerner
- Institut für Anorganische
und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse
7, D-60438 Frankfurt (Main), Germany
| | - Matthias Wagner
- Institut für Anorganische
und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse
7, D-60438 Frankfurt (Main), Germany
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9
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Prokofjevs A, Kampf JW, Solovyev A, Curran DP, Vedejs E. Weakly stabilized primary borenium cations and their dicationic dimers. J Am Chem Soc 2013; 135:15686-9. [PMID: 24087933 PMCID: PMC3857331 DOI: 10.1021/ja407458k] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hydride abstraction from monocationic hydride bridged salts [H(H2B-L)2](+) [B(C6F5)4]¯ (L = Lewis base) generates an observable primary borenium cation for L = iPr2NEt, but with L = Me3N, Me2NPr, or several N-heterocyclic carbenes, highly reactive dicationic dimers are formed.
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Affiliation(s)
| | - Jeff W. Kampf
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109
| | - Andrey Solovyev
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260
| | - Dennis P. Curran
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260
| | - Edwin Vedejs
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109
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10
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Braunschweig H, Damme A, Gamon D, Kelch H, Krummenacher I, Kupfer T, Radacki K. Synthesis, Coordination Behavior, and Reduction Chemistry of Cymantrenyl‐1,3‐bis(2,3,4,5‐tetraphenyl)borole. Chemistry 2012; 18:8430-6. [DOI: 10.1002/chem.201200284] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2012] [Indexed: 11/10/2022]
Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie, Julius–Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), Fax: (+49) 931‐31‐84623
| | - Alexander Damme
- Institut für Anorganische Chemie, Julius–Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), Fax: (+49) 931‐31‐84623
| | - Daniela Gamon
- Institut für Anorganische Chemie, Julius–Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), Fax: (+49) 931‐31‐84623
| | - Hauke Kelch
- Institut für Anorganische Chemie, Julius–Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), Fax: (+49) 931‐31‐84623
| | - Ivo Krummenacher
- Institut für Anorganische Chemie, Julius–Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), Fax: (+49) 931‐31‐84623
| | - Thomas Kupfer
- Institut für Anorganische Chemie, Julius–Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), Fax: (+49) 931‐31‐84623
| | - Krzysztof Radacki
- Institut für Anorganische Chemie, Julius–Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), Fax: (+49) 931‐31‐84623
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11
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Lorbach A, Hübner A, Wagner M. Aryl(hydro)boranes: versatile building blocks for boron-doped π-electron materials. Dalton Trans 2012; 41:6048-63. [DOI: 10.1039/c2dt30118k] [Citation(s) in RCA: 190] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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12
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Schnurr A, Samigullin K, Breunig JM, Bolte M, Lerner HW, Wagner M. One-Pot Synthesis of [(C6F5)2BH2]− from C6F5MgBr/BH3·SMe2 and Its in Situ Transformation to Piers’ Borane. Organometallics 2011. [DOI: 10.1021/om200186w] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anna Schnurr
- Institut für Anorganische und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Kamil Samigullin
- Institut für Anorganische und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Jens M. Breunig
- Institut für Anorganische und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Michael Bolte
- Institut für Anorganische und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Hans-Wolfram Lerner
- Institut für Anorganische und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Matthias Wagner
- Institut für Anorganische und Analytische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
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13
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Braunschweig H, Damme A, Gamon D, Kupfer T, Radacki K. Synthesis and Coordination Chemistry of 1-Cymantrenyl-2,3,4,5-tetraphenylborole. Inorg Chem 2011; 50:4250-2. [DOI: 10.1021/ic200559d] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Alexander Damme
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Daniela Gamon
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Thomas Kupfer
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Krzysztof Radacki
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
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