1
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K/Bidi L, Desjonquères A, Izzet G, Guillemot G. H 2 Evolution at a Reduced Hybrid Polyoxometalate and Its Vanadium-Oxo Derivative Used as Molecular Models for Reducible Metal Oxides. Inorg Chem 2023; 62:1935-1941. [PMID: 35912483 DOI: 10.1021/acs.inorgchem.2c01741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We herein report our investigations on the use of a tris-silanol-decorated polyoxotungstate, [SbW9O33(tBuSiOH)3]3-, as a molecular support model to describe the coordination of an isolated vanadium atom at metal oxides, focusing on the reactivity of the reduced derivatives in the presence of protons. Accumulation of electrons and protons at an active site is a main feature associated with heterogeneous catalysts able to conduct the (oxy)dehydrogenation of alkanes or alcohols. Our results indicate that two-electron reduced derivatives release H2 upon protonation, a reaction that probably takes place at the polyoxotungstic framework rather than at the vanadium center.
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Affiliation(s)
- Ludivine K/Bidi
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005 Paris, France
| | - Alix Desjonquères
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005 Paris, France
| | - Guillaume Izzet
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005 Paris, France
| | - Geoffroy Guillemot
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005 Paris, France
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2
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Ye CZ, Del Rosal I, Boreen MA, Ouellette ET, Russo DR, Maron L, Arnold J, Camp C. A versatile strategy for the formation of hydride-bridged actinide-iridium multimetallics. Chem Sci 2023; 14:861-868. [PMID: 36755711 PMCID: PMC9890599 DOI: 10.1039/d2sc04903a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 12/18/2022] [Indexed: 12/23/2022] Open
Abstract
Reaction of the potassium pentamethylcyclopentadienyl iridate tris-hydride K[IrCp*H3] with UCl4 and ThCl4(DME)2 led to the complete replacement of the halide ligands to generate multimetallic complexes U{(μ-H)3IrCp*}4 (1) and Th{[(μ-H2)(H)IrCp*]2[(μ-H)3IrCp*]2} (2), respectively. These analogues feature a significant discrepancy in hydride bonding modes; 1 contains twelve bridging hydrides while 2 contains ten bridging hydrides and two terminal, Ir-bound hydrides. Use of a U(iii) starting material, UI3(1,4-dioxane)1.5, resulted in the octanuclear complex {U[(μ2-H3)IrCp*]2[(μ3-H2)IrCp*]}2 (3). Computational studies indicate significant bonding character between U/Th and Ir in 1 and 2, with f-orbital involvement in the singly-occupied molecular orbitals of the uranium species 1. In addition, these studies attribute the variation in hydride bonding between 1 and 2 to differences in dispersion effects.
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Affiliation(s)
- Christopher Z. Ye
- Department of Chemistry, University of CaliforniaBerkeleyCalifornia 94720USA,Chemical Sciences Division, Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA
| | - Iker Del Rosal
- LPCNO, Université de Toulouse, INSA Toulouse135 Avenue de RangueilToulouse 31077France
| | - Michael A. Boreen
- Department of Chemistry, University of CaliforniaBerkeleyCalifornia 94720USA,Chemical Sciences Division, Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA
| | - Erik T. Ouellette
- Department of Chemistry, University of CaliforniaBerkeleyCalifornia 94720USA,Chemical Sciences Division, Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA
| | - Dominic R. Russo
- Department of Chemistry, University of CaliforniaBerkeleyCalifornia 94720USA,Chemical Sciences Division, Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA
| | - Laurent Maron
- LPCNO, Université de Toulouse, INSA Toulouse135 Avenue de RangueilToulouse 31077France
| | - John Arnold
- Department of Chemistry, University of California Berkeley California 94720 USA .,Chemical Sciences Division, Lawrence Berkeley National Laboratory Berkeley California 94720 USA
| | - Clément Camp
- Laboratory of Catalysis, Polymerization, Processes and Materials, CP2M UMR 5128, Université de Lyon, Institut de Chimie de Lyon, CNRS Université Lyon 1, ESCPE Lyon, 43 Bd du 11 Novembre 1918 F-69616 Villeurbanne France
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3
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Lassalle S, Petit J, Falconer RL, Hérault V, Jeanneau E, Thieuleux C, Camp C. Reactivity of Tantalum/Iridium and Hafnium/Iridium Alkyl Hydrides with Alkyl Lithium Reagents: Nucleophilic Addition, Alpha-H Abstraction, or Hydride Deprotonation? Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00158] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sébastien Lassalle
- Laboratory of Catalysis, Polymerization, Processes and Materials, CP2M UMR 5128 CNRS, Université de Lyon, Institut de Chimie de Lyon, Université Claude Bernard Lyon 1, ESCPE Lyon 43 Bd du 11 Novembre 1918, F-69616 Villeurbanne, France
| | - Julien Petit
- Laboratory of Catalysis, Polymerization, Processes and Materials, CP2M UMR 5128 CNRS, Université de Lyon, Institut de Chimie de Lyon, Université Claude Bernard Lyon 1, ESCPE Lyon 43 Bd du 11 Novembre 1918, F-69616 Villeurbanne, France
| | - Rosalyn L. Falconer
- Laboratory of Catalysis, Polymerization, Processes and Materials, CP2M UMR 5128 CNRS, Université de Lyon, Institut de Chimie de Lyon, Université Claude Bernard Lyon 1, ESCPE Lyon 43 Bd du 11 Novembre 1918, F-69616 Villeurbanne, France
| | - Valentin Hérault
- Laboratory of Catalysis, Polymerization, Processes and Materials, CP2M UMR 5128 CNRS, Université de Lyon, Institut de Chimie de Lyon, Université Claude Bernard Lyon 1, ESCPE Lyon 43 Bd du 11 Novembre 1918, F-69616 Villeurbanne, France
| | - Erwann Jeanneau
- Centre de Diffractométrie Henri Longchambon Université de Lyon, Institut de Chimie de Lyon, Université Claude Bernard Lyon 1, 5 Rue de la Doua, 69100 Villeurbanne, France
| | - Chloé Thieuleux
- Laboratory of Catalysis, Polymerization, Processes and Materials, CP2M UMR 5128 CNRS, Université de Lyon, Institut de Chimie de Lyon, Université Claude Bernard Lyon 1, ESCPE Lyon 43 Bd du 11 Novembre 1918, F-69616 Villeurbanne, France
| | - Clément Camp
- Laboratory of Catalysis, Polymerization, Processes and Materials, CP2M UMR 5128 CNRS, Université de Lyon, Institut de Chimie de Lyon, Université Claude Bernard Lyon 1, ESCPE Lyon 43 Bd du 11 Novembre 1918, F-69616 Villeurbanne, France
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4
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Park YJ, Peñas-Defrutos MN, Drummond MJ, Gordon Z, Kelly OR, Garvey IJ, Gullett KL, García-Melchor M, Fout AR. Secondary Coordination Sphere Influences the Formation of Fe(III)-O or Fe(III)-OH in Nitrite Reduction: A Synthetic and Computational Study. Inorg Chem 2022; 61:8182-8192. [PMID: 35580163 DOI: 10.1021/acs.inorgchem.2c00462] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reduction of nitrite (NO2-) to generate nitric oxide (NO) is a significant area of research due to their roles in the global nitrogen cycle. Here, we describe various modifications of the tris(5-cyclohexyliminopyrrol-2-ylmethyl)amine H3[N(piR)3] ligand where the steric bulk and acidity of the secondary coordination sphere were explored in the non-heme iron system for nitrite reduction. The cyclohexyl and 2,4,6-trimethylphenyl variants of the ligand were used to probe the mechanism of nitrite reduction. While previously stoichiometric addition of nitrite to the iron(II)-species generated an iron(III)-oxo complex, changing the secondary coordination sphere to mesityl resulted in an iron(III)-hydroxo complex. Subsequent addition of an electron and two protons led to the release of water and regeneration of the starting iron(II) catalyst. This sequence mirrored the proposed mechanism of nitrite reduction in biological systems, where the distal histidine residue shuttles protons to the active site. Computational studies aimed at interrogating the dissimilar behavior of the cyclohexyl and mesityl ligand systems resulting in Fe(III)-oxo and Fe(III)-hydroxo complexes, respectively, shed light on the key role of H-bonds involving the secondary coordination sphere in the relative stability of these species.
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Affiliation(s)
- Yun Ji Park
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
| | - Marconi N Peñas-Defrutos
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin, College Green, Dublin 2, Ireland
| | - Michael J Drummond
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
| | - Zachary Gordon
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
| | - Oscar R Kelly
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin, College Green, Dublin 2, Ireland
| | - Ian J Garvey
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
| | - Kelly L Gullett
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
| | - Max García-Melchor
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin, College Green, Dublin 2, Ireland
| | - Alison R Fout
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
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5
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Mondal P, Rajapakse S, Wijeratne GB. Following Nature's Footprint: Mimicking the High-Valent Heme-Oxo Mediated Indole Monooxygenation Reaction Landscape of Heme Enzymes. J Am Chem Soc 2022; 144:3843-3854. [PMID: 35112858 DOI: 10.1021/jacs.1c11068] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pathways for direct conversion of indoles to oxindoles have accumulated considerable interest in recent years due to their significance in the clear comprehension of various pathogenic processes in humans and the multipotent therapeutic value of oxindole pharmacophores. Heme enzymes are predominantly responsible for this conversion in biology and are thought to proceed with a compound-I active oxidant. These heme-enzyme-mediated indole monooxygenation pathways are rapidly emerging therapeutic targets; however, a clear mechanistic understanding is still lacking. Additionally, such knowledge holds promise in the rational design of highly specific indole monooxygenation synthetic protocols that are also cost-effective and environmentally benign. We herein report the first examples of synthetic compound-I and activated compound-II species that can effectively monooxygenate a diverse array of indoles with varied electronic and steric properties to exclusively produce the corresponding 2-oxindole products in good to excellent yields. Rigorous kinetic, thermodynamic, and mechanistic interrogations clearly illustrate an initial rate-limiting epoxidation step that takes place between the heme oxidant and indole substrate, and the resulting indole epoxide intermediate undergoes rearrangement driven by a 2,3-hydride shift on indole ring to ultimately produce 2-oxindole. The complete elucidation of the indole monooxygenation mechanism of these synthetic heme models will help reveal crucial insights into analogous biological systems, directly reinforcing drug design attempts targeting those heme enzymes. Moreover, these bioinspired model compounds are promising candidates for the future development of better synthetic protocols for the selective, efficient, and sustainable generation of 2-oxindole motifs, which are already known for a plethora of pharmacological benefits.
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Affiliation(s)
- Pritam Mondal
- Department of Chemistry and O'Neal Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama 35205, United States
| | - Shanuk Rajapakse
- Department of Chemistry and O'Neal Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama 35205, United States
| | - Gayan B Wijeratne
- Department of Chemistry and O'Neal Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama 35205, United States
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6
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Reinholdt A, Kwon S, Jafari MG, Gau MR, Caroll PJ, Lawrence C, Gu J, Baik MH, Mindiola DJ. An Isolable Azide Adduct of Titanium(II) Follows Bifurcated Deazotation Pathways to an Imide. J Am Chem Soc 2021; 144:527-537. [PMID: 34963052 DOI: 10.1021/jacs.1c11215] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
AdN3 (Ad = 1-adamantyl) reacts with the tetrahedral TiII complex [(TptBu,Me)TiCl] (TptBu,Me = hydrotris(3-tert-butyl-5-methylpyrazol-1-yl)borate) to generate a mixture of an imide complex, [(TptBu,Me)TiCl(NAd)] (4), and an unusual and kinetically stable azide adduct of the group 4 metal, namely, [(TptBu,Me)TiCl(γ-N3Ad)] (3). In these conversions, the product distribution is determined by the relative concentration of reactants. In contrast, the azide adduct 3 forms selectively when a masked TiII complex (N2 or AdNC adduct) reacts with AdN3. Upon heating, 3 extrudes dinitrogen in a unimolecular process proceeding through a titanatriazete intermediate to form the imide complex 4, but the observed thermal stability of the azide adduct (t1/2 = 61 days at 25 °C) is at odds with the large fraction of imide complex formed directly in reactions between AdN3 and [(TptBu,Me)TiCl] at room temperature (∼50% imide with a 1:1 stoichiometry). A combination of theoretical and experimental studies identified an additional deazotation pathway, proceeding through a bimetallic complex bridged by a single azide ligand. The electronic origin of this deazotation mechanism lies in the ability of azide adduct 3 to serve as a π-backbonding metallaligand toward free [(TptBu,Me)TiCl]. These findings unveil a new class of azide-to-imide conversions for transition metals, highlighting that the mechanisms underlying this common synthetic methodology may be more complex than conventionally assumed, given the concentration dependence in the conversion of an azide into an imide complex. Lastly, we show how significantly different AdN3 reacts when treated with [(TptBu,Me)VCl].
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Affiliation(s)
- Anders Reinholdt
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States
| | - Seongyeon Kwon
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.,Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea
| | - Mehrafshan G Jafari
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States
| | - Michael R Gau
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States
| | - Patrick J Caroll
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States
| | - Chad Lawrence
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States
| | - Jun Gu
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States
| | - Mu-Hyun Baik
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.,Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea
| | - Daniel J Mindiola
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States
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7
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McGeachie LJR, Bühl M, Cordes DB, Slawin AMZ, Woollins JD. Bridging (Thionylimido)metal Complexes. Inorg Chem 2021; 60:8423-8427. [PMID: 34043915 DOI: 10.1021/acs.inorgchem.1c00725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the first examples of the thionylimido ligand acting as a μ2-bridging ligand between two transition-metal centers; using Cp2Ti(NSO)2, we describe bi- and tetrametallic systems.
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Affiliation(s)
- Liam J R McGeachie
- EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, United Kingdom
| | - Michael Bühl
- EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, United Kingdom
| | - David B Cordes
- EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, United Kingdom
| | - Alexandra M Z Slawin
- EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, United Kingdom
| | - J Derek Woollins
- EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, United Kingdom.,Department of Chemistry, Khalifa University, Abu Dhabi, United Arab Emirates
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8
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Ward RJ, Del Rosal I, Chirdon DN, Kelley SP, Tarlton ML, Maron L, Walensky JR. Two-Electron Reduction of a U(VI) Complex with Al(C 5Me 5). Inorg Chem 2020; 59:16137-16142. [PMID: 33095563 DOI: 10.1021/acs.inorgchem.0c03036] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The reduction of U(VI) to U(IV) is rare, especially in one step, and not observed electrochemically as a one-wave, two-electron couple. Here, we demonstrate that reduction of the uranium(VI) bis(imido) complex, (C5Me5)2U[═N(4-OiPrC6H4)]2, is readily accomplished with Al(C5Me5), forming the bridging uranium(IV)/aluminum(III) imido complex (C5Me5)2U[μ2-N(4-OiPrC6H4)]2Al(C5Me5). The structure and bonding of the bridging imido complex is examined with electrochemical measurements in tandem with density functional theory calculations.
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Affiliation(s)
- Robert J Ward
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
| | - Iker Del Rosal
- Universite de Toulouse and CNRS, INSA, UPS, UMR 5215, LPCNO, Toulouse 31077, France
| | - Danielle N Chirdon
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
| | - Steven P Kelley
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
| | - Michael L Tarlton
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
| | - Laurent Maron
- Universite de Toulouse and CNRS, INSA, UPS, UMR 5215, LPCNO, Toulouse 31077, France
| | - Justin R Walensky
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
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9
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Synthesis and site-dependent reactivity of a heterometallic dinuclear bis(μ-imido) complex of tungsten and ruthenium. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Kim H, Rogler PJ, Sharma SK, Schaefer AW, Solomon EI, Karlin KD. Heme-Fe III Superoxide, Peroxide and Hydroperoxide Thermodynamic Relationships: Fe III-O 2•- Complex H-Atom Abstraction Reactivity. J Am Chem Soc 2020; 142:3104-3116. [PMID: 31913628 PMCID: PMC7034651 DOI: 10.1021/jacs.9b12571] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Establishing redox and thermodynamic relationships between metal-ion-bound O2 and its reduced (and protonated) derivatives is critically important for a full understanding of (bio)chemical processes involving dioxygen processing. Here, a ferric heme peroxide complex, [(F8)FeIII-(O22-)]- (P) (F8 = tetrakis(2,6-difluorophenyl)porphyrinate), and a superoxide complex, [(F8)FeIII-(O2•-)] (S), are shown to be redox interconvertible. Using Cr(η-C6H6)2, an equilibrium state where S and P are present is established in tetrahydrofuran (THF) at -80 °C, allowing determination of the reduction potential of S as -1.17 V vs Fc+/0. P could be protonated with 2,6-lutidinium triflate, yielding the low-spin ferric hydroperoxide species, [(F8)FeIII-(OOH)] (HP). Partial conversion of HP back to P using a derivatized phosphazene base gave a P/HP equilibrium mixture, leading to the determination of pKa = 28.8 for HP (THF, -80 °C). With the measured reduction potential and pKa, the O-H bond dissociation free energy (BDFE) of hydroperoxide species HP was calculated to be 73.5 kcal/mol, employing the thermodynamic square scheme and Bordwell relationship. This calculated O-H BDFE of HP, in fact, lines up with an experimental demonstration of the oxidizing ability of S via hydrogen atom transfer (HAT) from TEMPO-H (2,2,6,6-tetramethylpiperdine-N-hydroxide, BDFE = 66.5 kcal/mol in THF), forming the hydroperoxide species HP and TEMPO radical. Kinetic studies carried out with TEMPO-H(D) reveal second-order behavior, kH = 0.5, kD = 0.08 M-1 s-1 (THF, -80 °C); thus, the hydrogen/deuterium kinetic isotope effect (KIE) = 6, consistent with H-atom abstraction by S being the rate-determining step. This appears to be the first case where experimentally derived thermodynamics lead to a ferric heme hydroperoxide OO-H BDFE determination, that FeIII-OOH species being formed via HAT reactivity of the partner ferric heme superoxide complex.
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Affiliation(s)
- Hyun Kim
- Department of Chemistry , Johns Hopkins University , Baltimore , Maryland 21218 , United States
| | - Patrick J Rogler
- Department of Chemistry , Johns Hopkins University , Baltimore , Maryland 21218 , United States
| | - Savita K Sharma
- Department of Chemistry , Johns Hopkins University , Baltimore , Maryland 21218 , United States
| | - Andrew W Schaefer
- Department of Chemistry , Stanford University , Stanford , California 94305 , United States
| | - Edward I Solomon
- Department of Chemistry , Stanford University , Stanford , California 94305 , United States
| | - Kenneth D Karlin
- Department of Chemistry , Johns Hopkins University , Baltimore , Maryland 21218 , United States
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11
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Anker MD, Altaf Y, Lein M, Coles MP. Reactions of In-Zn bonds with organic azides: products that result from hetero- and homo-bimetallic behaviour. Dalton Trans 2019; 48:16588-16594. [PMID: 31657415 DOI: 10.1039/c9dt03990b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The indyl anion, K[In(NONDipp)] (NONDipp = [O(SiMe2NDipp)2]2-, Dipp = 2,6-iPr2C6H3) reacts with group 12 compounds M(BDIR)Cl (M = Zn, Cd; BDI = [HC{C(Me)NR}2]-, R = 2,4,6-Me3C6H2 (Mes), Dipp) to afford the heterobimetallic compounds (NONDipp)In-M(BDIR) that contain the first In-Zn and In-Cd bonds. The reactivity of the In-Zn bonds towards organic azides, R'N3 (R' = Mes, Dipp, Ph) was investigated. (NONDipp)In-Zn(BDIMes) reduces MesN3via an isolable triazenide intermediate to generate the bridging imido compound, (NONDipp)In-(μ-NMes)-Zn(BDIMes). Similar reactivity is noted from early-late heterobimetallic complexes. Under the same conditions, PhN3 reacts to afford a product that contains a bridging tetraazenide ligand, which is formed from the formal (2 + 3)-cycloaddition of second azide to an indium-imido bond. However, increasing the bulk of the BDI-ligand in (NONDipp)In-Zn(BDIDipp) leads to reductive coupling of PhN3 to give the hexazene complex. This mode of reactivity is reminiscent of the reductive behaviour of homobimetallic compounds.
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Affiliation(s)
- Mathew D Anker
- School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand.
| | - Yasir Altaf
- School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand.
| | - Matthias Lein
- School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand.
| | - Martyn P Coles
- School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand.
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12
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Ehudin MA, Quist DA, Karlin KD. Enhanced Rates of C-H Bond Cleavage by a Hydrogen-Bonded Synthetic Heme High-Valent Iron(IV) Oxo Complex. J Am Chem Soc 2019; 141:12558-12569. [PMID: 31318198 PMCID: PMC6734939 DOI: 10.1021/jacs.9b01253] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Secondary coordination sphere interactions are critical in facilitating the formation, stabilization, and enhanced reactivity of high-valent oxidants required for essential biochemical processes. Herein, we compare the C-H bond oxidizing capabilities of spectroscopically characterized synthetic heme iron(IV) oxo complexes, F8Cmpd-II (F8 = tetrakis(2,6-difluorophenyl)porphyrinate), and a 2,6-lutidinium triflate (LutH+) Lewis acid adduct involving ferryl O-atom hydrogen-bonding, F8Cmpd-II(LutH+). Second-order rate constants utilizing C-H and C-D substrates were obtained by UV-vis spectroscopic monitoring, while products were characterized and quantified by EPR spectroscopy and gas chromatography (GC). With xanthene, F8Cmpd-II(LutH+) reacts 40 times faster (k2 = 14.2 M-1 s-1; -90 °C) than does F8Cmpd-II, giving bixanthene plus xanthone and the heme product [F8FeIIIOH2]+. For substrates with greater C-H bond dissociation energies (BDEs) F8Cmpd-II(LutH+) reacts with the second order rate constants k2(9,10-dihydroanthracene; DHA) = 0.485 M-1 s-1 and k2(fluorene) = 0.102 M-1 s-1 (-90 °C); by contrast, F8Cmpd-II is unreactive toward these substrates. For xanthene vs xanthene-(d2), large, nonclassical deuterium kinetic isotope effects are roughly estimated for both F8Cmpd-II and F8Cmpd-II(LutH+). The deuterated H-bonded analog, F8Cmpd-II(LutD+), was also prepared; for the reaction with DHA, an inverse KIE (compared to F8Cmpd-II(LutH+)) was observed. This work originates/inaugurates experimental investigation of the reactivity of authentic H-bonded heme-based FeIV═O compounds, critically establishing the importance of oxo H-bonding (or protonation) in heme complexes and enzyme active sites.
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Affiliation(s)
- Melanie A. Ehudin
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - David A. Quist
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Kenneth D. Karlin
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
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13
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Kulyabin PS, Goryunov GP, Mladentsev DY, Uborsky DV, Voskoboynikov AZ, Canich JAM, Hagadorn JR. Reactivity of
C
1
‐Symmetric Heteroarylamido Hafnium Complexes towards Unsaturated Electrophilic Molecules: Development of New Families of Olefin Polymerization Catalysts. Chemistry 2019; 25:10478-10489. [DOI: 10.1002/chem.201901899] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 05/29/2019] [Indexed: 11/09/2022]
Affiliation(s)
- Pavel S. Kulyabin
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, 1/3 Moscow 119991 Russian Federation
| | - Georgy P. Goryunov
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, 1/3 Moscow 119991 Russian Federation
| | - Dmitry Y. Mladentsev
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, 1/3 Moscow 119991 Russian Federation
| | - Dmitry V. Uborsky
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, 1/3 Moscow 119991 Russian Federation
| | - Alexander Z. Voskoboynikov
- Department of ChemistryM. V. Lomonosov Moscow State University Leninskie Gory, 1/3 Moscow 119991 Russian Federation
| | - Jo Ann M. Canich
- Baytown Technology and Engineering ComplexExxonMobil Chemical Company Baytown TX 77520 USA
| | - John R. Hagadorn
- Baytown Technology and Engineering ComplexExxonMobil Chemical Company Baytown TX 77520 USA
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14
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Drummond MJ, Ford CL, Gray DL, Popescu CV, Fout AR. Radical Rebound Hydroxylation Versus H-Atom Transfer in Non-Heme Iron(III)-Hydroxo Complexes: Reactivity and Structural Differentiation. J Am Chem Soc 2019; 141:6639-6650. [PMID: 30969766 DOI: 10.1021/jacs.9b01516] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The characterization of high-valent iron centers in enzymes has been aided by synthetic model systems that mimic their reactivity or structural and spectral features. For example, the cleavage of dioxygen often produces an iron(IV)-oxo that has been characterized in a number of enzymatic and synthetic systems. In non-heme 2-oxogluterate dependent (iron-2OG) enzymes, the ferryl species abstracts an H-atom from bound substrate to produce the proposed iron(III)-hydroxo and caged substrate radical. Most iron-2OG enzymes perform a radical rebound hydroxylation at the site of the H-atom abstraction (HAA); however, recent reports have shown that certain substrates can be desaturated through the loss of a second H atom at a site adjacent to a heteroatom (N or O) for most native desaturase substrates. One proposed mechanism for the removal of the second H-atom involves a polar-cleavage mechanism (electron transfer-proton transfer) by the iron(III)-hydroxo, as opposed to a second HAA. Herein we report the synthesis and characterization of a series of iron complexes with hydrogen bonding interactions between bound aquo or hydroxo ligands and the secondary coordination sphere in ferrous and ferric complexes. Interconversion among the iron species is accomplished by stepwise proton or electron addition or subtraction, as well as H-atom transfer (HAT). The calculated bond dissociation free energies (BDFEs) of two ferric hydroxo complexes, differentiated by their noncovalent interactions and reactivity, suggest that neither complex is capable of activating even weak C-H bonds, lending further support to the proposed mechanism for desaturation in iron-2OG desaturase enzymes. Additionally, the ferric hydroxo species are differentiated by their reactivity toward performing a radical rebound hydroxylation of triphenylmethylradical. Our findings should encourage further study of the desaturase systems that may contain unique H-bonding motifs proximal to the active site that help bias substrate desaturation over hydroxylation.
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Affiliation(s)
- Michael J Drummond
- School of Chemical Sciences , University of Illinois at Urbana-Champaign , 600 South Mathews Avenue , Urbana , Illinois 61801 , United States
| | - Courtney L Ford
- School of Chemical Sciences , University of Illinois at Urbana-Champaign , 600 South Mathews Avenue , Urbana , Illinois 61801 , United States
| | - Danielle L Gray
- School of Chemical Sciences , University of Illinois at Urbana-Champaign , 600 South Mathews Avenue , Urbana , Illinois 61801 , United States
| | - Codrina V Popescu
- Department of Chemistry , University of Saint Thomas , 2115 Summit Avenue , Saint Paul , Minnesota 55105 , United States
| | - Alison R Fout
- School of Chemical Sciences , University of Illinois at Urbana-Champaign , 600 South Mathews Avenue , Urbana , Illinois 61801 , United States
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15
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Ehudin MA, Gee LB, Sabuncu S, Braun A, Moenne-Loccoz P, Hedman B, Hodgson KO, Solomon EI, Karlin KD. Tuning the Geometric and Electronic Structure of Synthetic High-Valent Heme Iron(IV)-Oxo Models in the Presence of a Lewis Acid and Various Axial Ligands. J Am Chem Soc 2019; 141:5942-5960. [PMID: 30860832 PMCID: PMC6611672 DOI: 10.1021/jacs.9b00795] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
High-valent ferryl species (e.g., (Por)FeIV═O, Cmpd-II) are observed or proposed key oxidizing intermediates in the catalytic cycles of heme-containing enzymes (P-450s, peroxidases, catalases, and cytochrome c oxidase) involved in biological respiration and oxidative metabolism. Herein, various axially ligated iron(IV)-oxo complexes were prepared to examine the influence of the identity of the base. These were generated by addition of various axial ligands (1,5-dicyclohexylimidazole (DCHIm), a tethered-imidazole system, and sodium derivatives of 3,5-dimethoxyphenolate and imidazolate). Characterization was carried out via UV-vis, electron paramagnetic resonance (EPR), 57Fe Mössbauer, Fe X-ray absorption (XAS), and 54/57Fe resonance Raman (rR) spectroscopies to confirm their formation and compare the axial ligand perturbation on the electronic and geometric structures of these heme iron(IV)-oxo species. Mössbauer studies confirmed that the axially ligated derivatives were iron(IV) and six-coordinate complexes. XAS and 54/57Fe rR data correlated with slight elongation of the iron-oxo bond with increasing donation from the axial ligands. The first reported synthetic H-bonded iron(IV)-oxo heme systems were made in the presence of the protic Lewis acid, 2,6-lutidinium triflate (LutH+), with (or without) DCHIm. Mössbauer, rR, and XAS spectroscopic data indicated the formation of molecular Lewis acid ferryl adducts (rather than full protonation). The reduction potentials of these novel Lewis acid adducts were bracketed through addition of outer-sphere reductants. The oxidizing capabilities of the ferryl species with or without Lewis acid vary drastically; addition of LutH+ to F8Cmpd-II (F8 = tetrakis(2,6-difluorophenyl)porphyrinate) increased its reduction potential by more than 890 mV, experimentally confirming that H-bonding interactions can increase the reactivity of ferryl species.
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Affiliation(s)
- Melanie A. Ehudin
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Leland B. Gee
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Sinan Sabuncu
- Department of Biochemistry & Molecular Biology, Oregon Health & Science University, Portland, Oregon 97239-3098, United States
| | - Augustin Braun
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Pierre Moenne-Loccoz
- Department of Biochemistry & Molecular Biology, Oregon Health & Science University, Portland, Oregon 97239-3098, United States
| | - Britt Hedman
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Keith O. Hodgson
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Edward I. Solomon
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, United States
| | - Kenneth D. Karlin
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
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16
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Fandos R, Bruña S, Hernández C, Otero A, Rodríguez A, Ruiz MJ, Terreros P, Cuadrado I. Titanium thiosalicylate complexes: functional metalloligands for the construction of redox-active heterometallic architectures. Dalton Trans 2018; 47:15391-15398. [PMID: 30306985 DOI: 10.1039/c8dt02641f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The titanium complex [TiCp*(thiosal)(thiosalH)] (1) has been synthesised by reaction of [TiCp*Me3], Cp* = η5-C5Me5, with thiosalicylic acid (H2thiosal). Complex 1 reacts with [M(μ-OH)(COD)]2 (M = Rh, Ir) to yield the corresponding early-late heterobimetallic complexes [TiCp*(thiosal)2M(COD)] (M = Rh (2); Ir (3)). Carbon monoxide replaces the COD ligand in 2 and 3 leading to the respective dicarbonyl complexes [TiCp*(thiosal)2M(CO)2] (M = Rh (4); Ir (5)). Compound 4 reacts with PPh3 to yield the monocarbonyl derivative [TiCp*(thiosal)2Rh(CO)(PPh3)] (6). The reaction of compound 1 with LinBu yields the tetrametallic complex [{TiCp*(thiosal)2Li}2(THF)3(H2O)] (7). Compound 7 reacts with [RuCp*Cl(COD)] yielding the heterometallic complex [TiCp*(thiosal)2RuCp*] (8). The molecular structures of compounds 4, 5 and 7 have been studied by X-ray diffraction. From cyclic voltammetric (CV) and square wave voltammetric (SWV) experiments, we observed that attachment of the titanium moiety of precursor 1 to a late transition metal moiety through the sulfur atoms has a significant influence on the reduction behaviour of the Ti(iv) metal centre. Thus, monometallic 1 exhibits an irreversible reduction process at -1.15 V vs. SCE, whereas the CVs of heterobimetallic compounds 2-6 are characterized by the reversible or quasi-reversible one-electron reduction of the Ti(iv)/Ti(iii) system, suggesting a significant stabilization of the Ti(iii) reduced species. Likewise, substitution of the M(COD) diolefin fragment in 2 and 3 by the M(CO)2 carbonyl-containing moiety (in compounds 4 and 5) leads to a significant anodic shift in the titanium E1/2 reduction redox potentials.
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Affiliation(s)
- Rosa Fandos
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Universidad de Castilla-La Mancha, Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), Facultad de Ciencias del Medio Ambiente, Avd. Carlos III, s/n, 45071 Toledo, Spain.
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17
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Glüer A, Schweizer JI, Karaca US, Würtele C, Diefenbach M, Holthausen MC, Schneider S. Hydrosilane Synthesis by Catalytic Hydrogenolysis of Chlorosilanes and Silyl Triflates. Inorg Chem 2018; 57:13822-13828. [DOI: 10.1021/acs.inorgchem.8b02336] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Arne Glüer
- Institute for Inorganic Chemistry, University of Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
| | - Julia I. Schweizer
- Institut für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438 Frankfurt am Main, Germany
| | - Uhut S. Karaca
- Institut für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438 Frankfurt am Main, Germany
| | - Christian Würtele
- Institute for Inorganic Chemistry, University of Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
| | - Martin Diefenbach
- Institut für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438 Frankfurt am Main, Germany
| | - Max C. Holthausen
- Institut für Anorganische und Analytische Chemie, Goethe-Universität, Max-von-Laue-Strasse 7, 60438 Frankfurt am Main, Germany
| | - Sven Schneider
- Institute for Inorganic Chemistry, University of Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
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Ford CL, Park YJ, Matson EM, Gordon Z, Fout AR. A bioinspired iron catalyst for nitrate and perchlorate reduction. Science 2017; 354:741-743. [PMID: 27846604 DOI: 10.1126/science.aah6886] [Citation(s) in RCA: 116] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 10/11/2016] [Indexed: 01/25/2023]
Abstract
Nitrate and perchlorate have considerable use in technology, synthetic materials, and agriculture; as a result, they have become pervasive water pollutants. Industrial strategies to chemically reduce these oxyanions often require the use of harsh conditions, but microorganisms can efficiently reduce them enzymatically. We developed an iron catalyst inspired by the active sites of nitrate reductase and (per)chlorate reductase enzymes. The catalyst features a secondary coordination sphere that aids in oxyanion deoxygenation. Upon reduction of the oxyanions, an iron(III)-oxo is formed, which in the presence of protons and electrons regenerates the catalyst and releases water.
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Affiliation(s)
- Courtney L Ford
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Yun Ji Park
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Ellen M Matson
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Zachary Gordon
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Alison R Fout
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA.
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19
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Gordon Z, Drummond MJ, Matson EM, Bogart JA, Schelter EJ, Lord RL, Fout AR. Tuning the Fe(II/III) Redox Potential in Nonheme Fe(II)-Hydroxo Complexes through Primary and Secondary Coordination Sphere Modifications. Inorg Chem 2017; 56:4852-4863. [PMID: 28394119 DOI: 10.1021/acs.inorgchem.6b03071] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The derivatization of the imino-functionalized tris(pyrrolylmethyl)amine ligand framework, N(XpiR)3 (XLR; X = H, Br; R = cyclohexyl (Cy), phenyl (Ph), 2,6- diisopropylphenyl (DIPP)), is reported. Modular ligand synthesis allows for facile modification of both the primary and secondary coordination sphere electronics. The iron(II)-hydroxo complexes, N(XpiR)(XafaR)2Fe(II)OH (XLRFeIIOH), are synthesized to establish the impact of the ligand modifications on the complexes' electronic properties, including their chemical and electrochemical oxidation. Cyclic voltammetry demonstrates that the Fe(II/III) redox couple spans a 400 mV range across the series. The origin of the shifted potential is explained based on spectroscopic, structural, and theoretical analyses of the iron(II) and iron(III) compounds.
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Affiliation(s)
- Zachary Gordon
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Michael J Drummond
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Ellen M Matson
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Justin A Bogart
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Eric J Schelter
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Richard L Lord
- Department of Chemistry, Grand Valley State University , 1 Campus Drive, Allendale, Michigan 49401, United States
| | - Alison R Fout
- Department of Chemistry, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States
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20
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Grant LN, Ahn S, Manor BC, Baik MH, Mindiola DJ. Structural elucidation of a mononuclear titanium methylidene. Chem Commun (Camb) 2017; 53:3415-3417. [DOI: 10.1039/c7cc00654c] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The first example of a structurally characterized titanium methylidene, (PN)2TiCH2, has been prepared via one-electron oxidation of (PN)2Ti(CH3) followed by deprotonation with an ylide or by H-atom abstraction using an aryloxyl radical.
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Affiliation(s)
- Lauren N. Grant
- Department of Chemistry
- University of Pennsylvania
- Philadelphia PA
- USA
| | - Seihwan Ahn
- Department of Chemistry
- Korea Advanced Institute of Science and Technology
- Daejeon
- South Korea
- Institute for Basic Science
| | - Brian C. Manor
- Department of Chemistry
- University of Pennsylvania
- Philadelphia PA
- USA
| | - Mu-Hyun Baik
- Department of Chemistry
- Korea Advanced Institute of Science and Technology
- Daejeon
- South Korea
- Institute for Basic Science
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21
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Laskar P, Yamamoto K, Srinivas A, Mifleur A, Nagae H, Tsurugi H, Mashima K. Tantallacyclopentadiene as a unique metal-containing diene ligand coordinated to nickel for preparing tantalum–nickel heterobimetallic complexes. Dalton Trans 2017; 46:13043-13054. [DOI: 10.1039/c7dt02481a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mononuclear tantallacyclopentadiene, TaCl3(C4H2tBu2), coordinates to Ni to form heterobimetallic complexes of Cl3Ta(μ-C4H2tBu2)Ni(L) (L = COD, phosphines, IPr).
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Affiliation(s)
- Payel Laskar
- Department of Chemistry
- Graduate School of Engineering Science
- Osaka University
- Toyonaka
- Japan
| | - Keishi Yamamoto
- Department of Chemistry
- Graduate School of Engineering Science
- Osaka University
- Toyonaka
- Japan
| | - Anga Srinivas
- Department of Chemistry
- Graduate School of Engineering Science
- Osaka University
- Toyonaka
- Japan
| | - Alexis Mifleur
- Department of Chemistry
- Graduate School of Engineering Science
- Osaka University
- Toyonaka
- Japan
| | - Haruki Nagae
- Department of Chemistry
- Graduate School of Engineering Science
- Osaka University
- Toyonaka
- Japan
| | - Hayato Tsurugi
- Department of Chemistry
- Graduate School of Engineering Science
- Osaka University
- Toyonaka
- Japan
| | - Kazushi Mashima
- Department of Chemistry
- Graduate School of Engineering Science
- Osaka University
- Toyonaka
- Japan
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22
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Chu WY, Richers CP, Kahle ER, Rauchfuss TB, Arrigoni F, Zampella G. Imine-Centered Reactions in Imino-Phosphine Complexes of Iron Carbonyls. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00318] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wan-Yi Chu
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Casseday P. Richers
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Elizabeth R. Kahle
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Thomas B. Rauchfuss
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Federica Arrigoni
- Department of Biotechnology
and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milan, Italy
| | - Giuseppe Zampella
- Department of Biotechnology
and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milan, Italy
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Kupper C, Rees JA, Dechert S, DeBeer S, Meyer F. Complete Series of {FeNO}(8), {FeNO}(7), and {FeNO}(6) Complexes Stabilized by a Tetracarbene Macrocycle. J Am Chem Soc 2016; 138:7888-98. [PMID: 27191681 DOI: 10.1021/jacs.6b00584] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Use of a macrocyclic tetracarbene ligand, which is topologically reminiscent of tetrapyrrole macrocycles though electronically distinct, has allowed for the isolation, X-ray crystallographic characterization and comprehensive spectroscopic investigation of a complete set of {FeNO}(x) complexes (x = 6, 7, 8). Electrochemical reduction, or chemical reduction with CoCp2, of the {FeNO}(7) complex 1 leads to the organometallic {FeNO}(8) species 2. Its crystallographic structure determination is the first for a nonheme iron nitroxyl {FeNO}(8) and has allowed to identify structural trends among the series of {FeNO}(x) complexes. Combined experimental data including (57)Fe Mössbauer, IR, UV-vis-NIR, NMR and Kβ X-ray emission spectroscopies in concert with DFT calculations suggest a largely metal centered reduction of 1 to form the low spin (S = 0) {FeNO}(8) species 2. The very strong σ-donor character of the tetracarbene ligand imparts unusual properties and spectroscopic signatures such as low (57)Fe Mössbauer isomer shifts and linear Fe-N-O units with high IR stretching frequencies for the NO ligand. The observed metal-centered reduction leads to distinct reactivity patterns of the {FeNO}(8) species. In contrast to literature reported {FeNO}(8) complexes, 2 does not undergo NO protonation under strictly anaerobic conditions. Only in the presence of both dioxygen and protons is rapid and clean oxidation to the {FeNO}(7) complex 1 observed. While 1 is stable toward dioxygen, its reaction with dioxygen under NO atmosphere forms the {FeNO}(6)(ONO) complex 3 that features an unusual O-nitrito ligand trans to the NO. 3 is a rare example of a nonheme octahedral {FeNO}(6) complex. Its electrochemical or chemical reduction triggers dissociation of the O-nitrito ligand and sequential formation of the {FeNO}(7) and {FeNO}(8) compounds 1 and 2. A consistent electronic structure picture has been derived for these unique organometallic variants of the key bioinorganic {FeNO}(x) functional units.
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Affiliation(s)
- Claudia Kupper
- Institut für Anorganische Chemie, Georg-August-Universität , Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Julian A Rees
- Max Planck Institute for Chemical Energy Conversion , Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany.,Department of Chemistry, University of Washington , Box 351700, Seattle, Washington 98195-1700, United States
| | - Sebastian Dechert
- Institut für Anorganische Chemie, Georg-August-Universität , Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion , Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany.,Department of Chemistry and Biochemistry, Cornell University , Ithaca, New York 14853, United States
| | - Franc Meyer
- Institut für Anorganische Chemie, Georg-August-Universität , Tammannstrasse 4, D-37077 Göttingen, Germany
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24
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Carlsen RW, Ess DH. Allylic amination reactivity of Ni, Pd, and Pt heterobimetallic and monometallic complexes. Dalton Trans 2016; 45:9835-40. [DOI: 10.1039/c6dt00256k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Transition metal heterobimetallic complexes with dative metal–metal interactions have the potential for novel fast reactivity.
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Affiliation(s)
- Ryan W. Carlsen
- Department of Chemistry and Biochemistry
- Brigham Young University
- Provo
- USA
| | - Daniel H. Ess
- Department of Chemistry and Biochemistry
- Brigham Young University
- Provo
- USA
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25
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Kouno M, Miyashita Y, Yoshinari N, Konno T. A 2,2′-Bipyridine Dipalladium(II) Coordination System That Shows Three Different Coordination Modes of 3-Aminopropanethiol on Deprotonation. CHEM LETT 2015. [DOI: 10.1246/cl.150709] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Masahiro Kouno
- Department of Chemistry, Graduate School of Science, Osaka University
| | | | - Nobuto Yoshinari
- Department of Chemistry, Graduate School of Science, Osaka University
| | - Takumi Konno
- Department of Chemistry, Graduate School of Science, Osaka University
- CREST, JST
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26
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Suzuki N, Haraga K, Shimamura T, Masuyama Y. Synthesis and Structures of Ti‐Pd Heterobimetallic Complexes. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201501003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Noriyuki Suzuki
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7‐1 Kioi‐cho, Chiyoda‐ku, Tokyo 102‐8554, Japan, http://www.mls.sophia.ac.jp/~orgsynth/
| | - Kenji Haraga
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7‐1 Kioi‐cho, Chiyoda‐ku, Tokyo 102‐8554, Japan, http://www.mls.sophia.ac.jp/~orgsynth/
| | - Tatsuki Shimamura
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7‐1 Kioi‐cho, Chiyoda‐ku, Tokyo 102‐8554, Japan, http://www.mls.sophia.ac.jp/~orgsynth/
| | - Yoshiro Masuyama
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7‐1 Kioi‐cho, Chiyoda‐ku, Tokyo 102‐8554, Japan, http://www.mls.sophia.ac.jp/~orgsynth/
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27
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Walker WK, Kay BM, Michaelis SA, Anderson DL, Smith SJ, Ess DH, Michaelis DJ. Origin of Fast Catalysis in Allylic Amination Reactions Catalyzed by Pd–Ti Heterobimetallic Complexes. J Am Chem Soc 2015; 137:7371-8. [DOI: 10.1021/jacs.5b02428] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Whitney K. Walker
- Department of Chemistry and
Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Benjamin M. Kay
- Department of Chemistry and
Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Scott A. Michaelis
- Department of Chemistry and
Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Diana L. Anderson
- Department of Chemistry and
Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Stacey J. Smith
- Department of Chemistry and
Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Daniel H. Ess
- Department of Chemistry and
Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - David J. Michaelis
- Department of Chemistry and
Biochemistry, Brigham Young University, Provo, Utah 84602, United States
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29
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Zhang Y, Roberts SP, Bergman RG, Ess DH. Mechanism and Catalytic Impact of Ir–Ta Heterobimetallic and Ir–P Transition Metal/Main Group Interactions on Alkene Hydrogenation. ACS Catal 2015. [DOI: 10.1021/cs501884j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Ying Zhang
- Department
of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Samuel P. Roberts
- Department
of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Robert G. Bergman
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Daniel H. Ess
- Department
of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
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30
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Zhong W, Yan H, Li Y, Bregadze VI. Reactivity of Cp*M (M = Co, Rh, Ir) half-sandwich complexes containing a chelating 1,2-dicarba-closo-dodecaborane-1,2-dichalcogenolato ligand with organic azides. Russ Chem Bull 2015. [DOI: 10.1007/s11172-014-0533-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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31
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Oishi M, Oshima M, Suzuki H. A Study on Zr–Ir Multiple Bonding Active for C–H Bond Cleavage. Inorg Chem 2014; 53:6634-54. [PMID: 24915499 DOI: 10.1021/ic500258g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Masataka Oishi
- Graduate
School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Masato Oshima
- School
of Engineering, Tokyo Polytechnic University, 1583 Iiyama, Atsugi-shi, Kanagawa 243-0297, Japan
| | - Hiroharu Suzuki
- Graduate
School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
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32
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Zhong W, Xie M, Li Y, Yan H. Investigation into the reactivity of 16-electron complexes Cp#Co(S2C2B10H10) (Cp# = Cp, Cp*) towards methyl diazoacetate and toluenesulphonyl azide. RSC Adv 2014. [DOI: 10.1039/c4ra13017k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
A three-component reaction of the 16-electron half-sandwich complex Cp*Co(S2C2B10H10) (2) with both methyl diazoacetate (MDA) and toluenesulphonyl azide (TsN3) led to the formation of complexes 3 and 4, while a two-component reaction of complex 2 with MDA afforded products 5–7.
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Affiliation(s)
- Wei Zhong
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing, China
- College of Biological, Chemical Sciences and Engineering
| | - Mingshi Xie
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing, China
| | - Yizhi Li
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing, China
| | - Hong Yan
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing, China
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33
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Green AG, Kiesz MD, Oria JV, Elliott AG, Buechler AK, Hohenberger J, Meyer K, Zink JI, Diaconescu PL. Characterization of an Iron–Ruthenium Interaction in a Ferrocene Diamide Complex. Inorg Chem 2013; 52:5603-10. [DOI: 10.1021/ic400773s] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Aaron G. Green
- Department of Chemistry & Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Matthew D. Kiesz
- Department of Chemistry & Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Jeremy V. Oria
- Department of Chemistry & Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Andrew G. Elliott
- Department of Chemistry & Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Andrew K. Buechler
- Department of Chemistry & Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Johannes Hohenberger
- Department of Chemistry and
Pharmacy, Friedrich-Alexander-University Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Karsten Meyer
- Department of Chemistry and
Pharmacy, Friedrich-Alexander-University Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Jeffrey I. Zink
- Department of Chemistry & Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Paula L. Diaconescu
- Department of Chemistry & Biochemistry, University of California, Los Angeles, California 90095, United States
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