1
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Bhutto SM, Hooper RX, Mercado BQ, Holland PL. Mechanism of Nitrogen-Carbon Bond Formation from Iron(IV) Disilylhydrazido Intermediates during N 2 Reduction. J Am Chem Soc 2023; 145:4626-4637. [PMID: 36794981 DOI: 10.1021/jacs.2c12382] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
We recently reported a reaction sequence that activates C-H bonds in simple arenes as well as the N-N triple bond in N2, delivering the aryl group to N2 to form a new N-C bond (Nature 2020, 584, 221). This enables the transformation of abundant feedstocks (arenes and N2) into N-containing organic compounds. The key N-C bond forming step occurs upon partial silylation of N2. However, the pathway through which reduction, silylation, and migration occurred was unknown. Here, we describe synthetic, structural, magnetic, spectroscopic, kinetic, and computational studies that elucidate the steps of this transformation. N2 must be silylated twice at the distal N atom before aryl migration can occur, and sequential silyl radical and silyl cation addition is a kinetically competent pathway to a formally iron(IV)-NN(SiMe3)2 intermediate that can be isolated at low temperature. Kinetic studies show its first-order conversion to the migrated product, and DFT calculations indicate a concerted transition state for migration. The electronic structure of the formally iron(IV) intermediate is examined using DFT and CASSCF calculations, which reveal contributions from iron(II) and iron(III) resonance forms with oxidized NNSi2 ligands. The depletion of electron density from the Fe-coordinated N atom makes it electrophilic enough to accept the incoming aryl group. This new pathway for the N-C bond formation offers a method for functionalizing N2 using organometallic chemistry.
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Affiliation(s)
- Samuel M Bhutto
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, Connecticut 06520, United States
| | - Reagan X Hooper
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, Connecticut 06520, United States
| | - Brandon Q Mercado
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, Connecticut 06520, United States
| | - Patrick L Holland
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, Connecticut 06520, United States
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2
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Yogendra S, Wilson DWN, Hahn AW, Weyhermüller T, Van Stappen C, Holland P, DeBeer S. Sulfur-Ligated [2Fe-2C] Clusters as Synthetic Model Systems for Nitrogenase. Inorg Chem 2023; 62:2663-2671. [PMID: 36715662 PMCID: PMC9930126 DOI: 10.1021/acs.inorgchem.2c03693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Indexed: 01/31/2023]
Abstract
Metal clusters featuring carbon and sulfur donors have coordination environments comparable to the active site of nitrogenase enzymes. Here, we report a series of di-iron clusters supported by the dianionic yldiide ligands, in which the Fe sites are bridged by two μ2-C atoms and four pendant S donors.The [L2Fe2] (L = {[Ph2P(S)]2C}2-) cluster is isolable in two oxidation levels, all-ferrous Fe2II and mixed-valence FeIIFeIII. The mixed-valence cluster displays two peaks in the Mössbauer spectra, indicating slow electron transfer between the two sites. The addition of the Lewis base 4-dimethylaminopyridine to the Fe2II cluster results in coordination with only one of the two Fe sites, even in the presence of an excess base. Conversely, the cluster reacts with 8 equiv of isocyanide tBuNC to give a monometallic complex featuring a new C-C bond between the ligand backbone and the isocyanide. The electronic structure descriptions of these complexes are further supported by X-ray absorption and resonant X-ray emission spectroscopies.
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Affiliation(s)
- Sivathmeehan Yogendra
- Max
Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Daniel W. N. Wilson
- Department
of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Anselm W. Hahn
- Max
Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Thomas Weyhermüller
- Max
Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Casey Van Stappen
- Max
Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Patrick Holland
- Department
of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Serena DeBeer
- Max
Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
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3
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Hyun SM, Reid KA, Vali SW, Lindahl PA, Powers DC. Cis-Divacant Octahedral Fe(II) in a Dimensionally Reduced Family of 2-(Pyridin-2-yl)pyrrolide Complexes. Inorg Chem 2021; 60:15617-15626. [PMID: 34590844 PMCID: PMC8969077 DOI: 10.1021/acs.inorgchem.1c02240] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Four-coordinate transition-metal complexes can adopt a diverse array of coordination geometries, with square planar and tetrahedral coordination being the most prevalent. Previously, we reported the synthesis of a trinuclear Fe(II) complex, Fe3TPM2, supported by a 3-fold-symmetric 2-pyridylpyrrolide ligand [i.e., tris(5-(pyridin-2-yl)-1H-pyrrol-2-yl)methane] that featured a rare cis-divacant octahedral (CDO) geometry at each Fe(II) center. Here, a series of truncated 2-pyridylpyrrolide ligands are described that support mono- and binuclear Fe(II) complexes that also exhibit CDO geometries. Metalation of the tetradentate ligand bis[5-(pyridin-2-yl)-1H-pyrrol-2-yl]methane (H2BPM) in tetrahydrofuran (THF) results in the binuclear complex Fe2(BPM)2(THF)2 in which both Fe(II) ions are octahedrally coordinated. The coordinated THF solvent ligands are labile: THF dissociation leads to Fe2(BPM)2, which features five-coordinate Fe(II) ions. The Fe-Fe distance in these binuclear complexes can be elongated by ligand methylation. Metalation of bis[5-(6-methylpyridin-2-yl)-1H-pyrrol-2-yl]methane (H2BPMMe) in THF leads to the formation of four-coordinate, CDO Fe(II) centers in Fe(BPMMe)2. Further ligand truncation affords bidentate ligands 2-(1H-pyrrol-2-yl)pyridine (PyrPyrrH) and 2-methyl-6-(1H-pyrrol-2-yl)pyridine (PyrMePyrrH). Metalation of these ligands in THF affords six-coordinate complexes Fe(PyrPyrr)2(THF)2 and Fe(PyrMePyrr)2(THF)2. Dissociation of labile solvent ligands provides access to four-coordinate Fe(II) complexes. Ligand disproportionation at Fe(PyrPyrr)2 results in the formation of Fe(PyrPyrr)3 and Fe(0). Ligand methylation suppresses this disproportionation and enables isolation of Fe(PyrMePyrr)2, which is rigorously CDO. Complete ligand truncation, by separating the 2-pyridylpyrrolide ligands into the constituent monodentate pyridyl and pyrrolide donors, affords Fe(Pyr)2(Pyrr)2 in which Fe(II) is tetrahedrally coordinated. Computational analysis indicates that the potential energy surface that dictates the coordination geometry in this family of four-coordinate complexes is fairly flat in the vicinity of CDO coordination. These synthetic studies provide the structural basis to explore the implications of CDO geometry on Fe-catalyzed reactions.
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Affiliation(s)
- Sung-Min Hyun
- Department of Chemistry, Texas A&M University, College Station, TX 77843, United States
| | - Kaleb A. Reid
- Department of Chemistry, Texas A&M University, College Station, TX 77843, United States
| | - Shaik Waseem Vali
- Department of Chemistry, Texas A&M University, College Station, TX 77843, United States
| | - Paul A. Lindahl
- Department of Chemistry, Texas A&M University, College Station, TX 77843, United States
| | - David C. Powers
- Department of Chemistry, Texas A&M University, College Station, TX 77843, United States
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4
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Wang P, Yap GPA, Riordan CG. Iron(II)-alkoxide and -aryloxide complexes of a tris(thioether)borate ligand: synthesis, molecular structures, and implications on the origin of instability of their iron(II)-catecholate counterpart. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2021; 77:544-550. [PMID: 34482298 DOI: 10.1107/s2053229621008500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 08/16/2021] [Indexed: 05/31/2023]
Abstract
The phenyltris[(tert-butylthio)methyl]borate ligand, [PhTttBu], has been studied extensively as a platform for coordination, organometallic, and bioinorganic chemistry, especially with 3d metals. While [PhTttBu]Co(3,5-DBCatH) (3,5-DBCatH is 3,5-di-tert-butylcatecholate), a CoII-monoanionic catecholate complex, was successfully isolated to model the active site of cobalt(II)-substituted homoprotocatechuate 2,3-dioxygenase (Co-HPCD) [Wang et al. (2019). Inorg. Chim. Acta, 488, 49-55], its iron(II) counterpart, [PhTttBu]Fe(3,5-DBCatH), was not accessible via similar synthetic routes. Switching the nucleophile from catecholate to alkoxide or aryloxide, however, led to the successful isolation of three highly air-sensitive FeII-alkoxide and -aryloxide complexes, namely, (triphenylmethoxo){tris[(tert-butylsulfanyl)methyl]phenylborato-κ3S,S',S''}iron(II), [Fe(C21H38BS3)(C19H15O)], (2), (2,6-dimethylphenolato){tris[(tert-butylsulfanyl)methyl]phenylborato-κ3S,S',S''}iron(II), [Fe(C21H38BS3)(C8H9O)], (3), and bis{μ-tris[(tert-butylsulfanyl)methyl]phenylborato-κ3S,S':S''}bis[(phenolato-κO)iron(II)] toluene disolvate, [Fe2(C21H38BS3)2(C6H5O)2]·2C7H8, (4). In the solid state, compounds (2) and (3) are monomeric, with [PhTttBu] acting as a tridentate ligand. In contrast, compound (4) crystallizes as a dimeric complex, wherein each [PhTttBu] ligand binds to an iron centre with two thioethers and binds to the other iron centre with the third thioether. The molecular structures of (2)-(4) demonstrate a diversity in the binding modes of [PhTttBu] and highlight its potential use for assembling multinuclear complexes. In addition, the successful isolation of (2)-(4), as well as the structural information of a [PhTttBu] modification product, namely, bis{μ-tris[(tert-butylsulfanyl)methyl](2-oxidophenolato)borato-κO,O',S,S':O'}dicobalt(II), [Co2(C21H37BO2S3)2], (5), obtained from the reaction of [PhTttBu]CoCl with potassium monoanionic catecholate, shed light on the origin of the instability of [PhTttBu]Fe(3,5-DBCatH).
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Affiliation(s)
- Peng Wang
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA
| | - Glenn P A Yap
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA
| | - Charles G Riordan
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA
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5
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Choe S, Lee H, Nayab S. Synthesis, structures, and catalytic efficiency in ring opening polymerization of rac-lactide with tridentate vs. bidentate cobalt( ii), zinc( ii), and cadmium( ii) complexes containing N-substituted N, N-bis((3,5-dimethyl-1 H-pyrazol-1-yl)methyl)amine ligands. RSC Adv 2021; 11:18840-18851. [PMID: 35478641 PMCID: PMC9033469 DOI: 10.1039/d1ra02365a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 05/20/2021] [Indexed: 01/09/2023] Open
Abstract
A series of Co(ii), Zn(ii), and Cd(ii) complexes supported by 1-(3,5-dimethyl-1H-pyrazol-1-yl)-N-((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-N-(furan-2-ylmethyl)methanamine (LA) and N,N-bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-4-isopropylaniline (LB) were synthesized. The direct chelation of CoCl2·6H2O, ZnCl2, and CdBr2·4H2O by the ligands produced [LnMX2] (Ln = LA or LB; M = Zn or Co, with X = Cl; M = Cd, with X = Br) complexes in high yields. Structural studies revealed that [LBCoCl2] and [LBZnCl2] adopted distorted tetrahedral geometries, as LB coordinated the metal centers in a bidentate fashion, while LA coordinated the metal centers in a tridentate fashion through the nitrogen atoms of the pyrazole and amine moieties, so that [LACoCl2] and [LAZnCl2] exhibited trigonal bipyramidal geometries and [LACdBr2] a square pyramidal geometry. [LBCdBr2] has two Cd-containing structures per unit cell, whereby one Cd center adopted a distorted tetrahedral geometry and the other exhibited square bipyramidal geometry. The in situ-generated alkyl derivatives of the synthesized complexes were assessed in the ring-opening polymerization of rac-lactide. Heterotactic polylactides (PLAs) were furnished with all complexes. The [LBZnCl2]/MeLi system produced PLA with a superior heterotactic bias (Pr up to 0.94) at −25 °C. PLAs with wide-ranging polydispersity indices (1.16–2.23) and low molecular weights were produced in all cases, irrespective of the specific M(II) center and ancillary ligand utilized. Co(ii), Zn(ii), and Cd(ii) complexes supported by bis-pyrazolyl ligands were applied to the ring-opening polymerization of rac-lactide to produce heterotactic polylactides (PLAs) with superior heterotactic bias i.e. Pr up to 0.94 at −25 °C.![]()
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Affiliation(s)
- Solhye Choe
- Department of Chemistry and Green-Nano Materials Research Center
- Kyungpook National University
- Daegu
- Republic of Korea
| | - Hyosun Lee
- Department of Chemistry and Green-Nano Materials Research Center
- Kyungpook National University
- Daegu
- Republic of Korea
| | - Saira Nayab
- Department of Chemistry
- Shaheed Benazir Bhutto University
- Islamic Republic of Pakistan
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6
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Lutz SA, Hickey AK, Gao Y, Chen CH, Smith JM. Two-State Reactivity in Iron-Catalyzed Alkene Isomerization Confers σ-Base Resistance. J Am Chem Soc 2020; 142:15527-15535. [PMID: 32786744 DOI: 10.1021/jacs.0c07300] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A low-coordinate, high spin (S = 3/2) organometallic iron(I) complex is a catalyst for the isomerization of alkenes. A combination of experimental and computational mechanistic studies supports a mechanism in which alkene isomerization occurs by the allyl mechanism. Importantly, while substrate binding occurs on the S = 3/2 surface, oxidative addition to an η1-allyl intermediate only occurs on the S = 1/2 surface. Since this spin state change is only possible when the alkene substrate is bound, the catalyst has high immunity to typical σ-base poisons due to the antibonding interactions of the high spin state.
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Affiliation(s)
- Sean A Lutz
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Anne K Hickey
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Yafei Gao
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Chun-Hsing Chen
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Jeremy M Smith
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
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7
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Daniels CL, Knobeloch M, Yox P, Adamson MAS, Chen Y, Dorn RW, Wu H, Zhou G, Fan H, Rossini AJ, Vela J. Intermetallic Nanocatalysts from Heterobimetallic Group 10–14 Pyridine-2-thiolate Precursors. Organometallics 2020. [DOI: 10.1021/acs.organomet.9b00803] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Carena L. Daniels
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Megan Knobeloch
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Philip Yox
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | | | - Yunhua Chen
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Rick W. Dorn
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- Ames Laboratory, Ames, Iowa 50011, United States
| | - Hao Wu
- School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo, Zhejiang, People’s Republic of China
| | - Guoquan Zhou
- School of Materials and Chemical Engineering, Ningbo University of Technology, Ningbo, Zhejiang, People’s Republic of China
| | - Huajun Fan
- College of Chemical Engineering, Sichuan University of Science and Engineering, Zigong, Sichuan, People’s Republic of China
| | - Aaron J. Rossini
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- Ames Laboratory, Ames, Iowa 50011, United States
| | - Javier Vela
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
- Ames Laboratory, Ames, Iowa 50011, United States
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8
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Thompson NB, Oyala PH, Dong HT, Chalkley MJ, Zhao J, Alp EE, Hu M, Lehnert N, Peters JC. Electronic Structures of an [Fe(NNR 2)] +/0/- Redox Series: Ligand Noninnocence and Implications for Catalytic Nitrogen Fixation. Inorg Chem 2019; 58:3535-3549. [PMID: 30762355 DOI: 10.1021/acs.inorgchem.9b00133] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The intermediacy of metal-NNH2 complexes has been implicated in the catalytic cycles of several examples of transition-metal-mediated nitrogen (N2) fixation. In this context, we have shown that triphosphine-supported Fe(N2) complexes can be reduced and protonated at the distal N atom to yield Fe(NNH2) complexes over an array of charge and oxidation states. Upon exposure to further H+/e- equivalents, these species either continue down a distal-type Chatt pathway to yield a terminal iron(IV) nitride or instead follow a distal-to-alternating pathway resulting in N-H bond formation at the proximal N atom. To understand the origin of this divergent selectivity, herein we synthesize and elucidate the electronic structures of a redox series of Fe(NNMe2) complexes, which serve as spectroscopic models for their reactive protonated congeners. Using a combination of spectroscopies, in concert with density functional theory and correlated ab initio calculations, we evidence one-electron redox noninnocence of the "NNMe2" moiety. Specifically, although two closed-shell configurations of the "NNR2" ligand have been commonly considered in the literature-isodiazene and hydrazido(2-)-we provide evidence suggesting that, in their reduced forms, the present iron complexes are best viewed in terms of an open-shell [NNR2]•- ligand coupled antiferromagnetically to the Fe center. This one-electron redox noninnocence resembles that of the classically noninnocent ligand NO and may have mechanistic implications for selectivity in N2 fixation activity.
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Affiliation(s)
- Niklas B Thompson
- Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Paul H Oyala
- Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Hai T Dong
- Department of Chemistry and Department of Biophysics , University of Michigan , Ann Arbor , Michigan 48109-1055 , United States
| | - Matthew J Chalkley
- Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Jiyong Zhao
- Advanced Photon Source (APS) , Argonne National Laboratory (ANL) , Argonne , Illinois 60439 , United States
| | - E Ercan Alp
- Advanced Photon Source (APS) , Argonne National Laboratory (ANL) , Argonne , Illinois 60439 , United States
| | - Michael Hu
- Advanced Photon Source (APS) , Argonne National Laboratory (ANL) , Argonne , Illinois 60439 , United States
| | - Nicolai Lehnert
- Department of Chemistry and Department of Biophysics , University of Michigan , Ann Arbor , Michigan 48109-1055 , United States
| | - Jonas C Peters
- Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
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9
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Wang P, Yap GP, Riordan CG. Synthesis, characterization and O2 reactivity of a bioinspired cobalt(II)-catecholate complex. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.01.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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10
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Carreras A, Bernuz E, Marugan X, Llunell M, Alemany P. Effects of Temperature on the Shape and Symmetry of Molecules and Solids. Chemistry 2018; 25:673-691. [DOI: 10.1002/chem.201801682] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 07/17/2018] [Indexed: 01/22/2023]
Affiliation(s)
- Abel Carreras
- Donostia International Physics Center (DIPC) Paseo Manuel de Lardizabal 4 20018 Donostia, Euskadi Spain
| | - Efrem Bernuz
- Departament de Ciència dels Materials i Química Física andInstitut de Química Teòrica i Computacional (IQTCUB)Universitat de Barcelona Diagonal 647 08028 Barcelona, Catalunya Spain
| | - Xavier Marugan
- Departament de Ciència dels Materials i Química Física andInstitut de Química Teòrica i Computacional (IQTCUB)Universitat de Barcelona Diagonal 647 08028 Barcelona, Catalunya Spain
| | - Miquel Llunell
- Departament de Ciència dels Materials i Química Física andInstitut de Química Teòrica i Computacional (IQTCUB)Universitat de Barcelona Diagonal 647 08028 Barcelona, Catalunya Spain
| | - Pere Alemany
- Departament de Ciència dels Materials i Química Física andInstitut de Química Teòrica i Computacional (IQTCUB)Universitat de Barcelona Diagonal 647 08028 Barcelona, Catalunya Spain
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11
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Bonyhady SJ, DeRosha DE, Vela J, Vinyard DJ, Cowley RE, Mercado BQ, Brennessel WW, Holland PL. Iron and Cobalt Diazoalkane Complexes Supported by β-Diketiminate Ligands: A Synthetic, Spectroscopic, and Computational Investigation. Inorg Chem 2018; 57:5959-5972. [DOI: 10.1021/acs.inorgchem.8b00468] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Simon J. Bonyhady
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Daniel E. DeRosha
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Javier Vela
- Department of Chemistry, University of Rochester, 120 Trustee Road, Rochester, New York 14627, United States
| | - David J. Vinyard
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Ryan E. Cowley
- Department of Chemistry, University of Rochester, 120 Trustee Road, Rochester, New York 14627, United States
| | - Brandon Q. Mercado
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - William W. Brennessel
- Department of Chemistry, University of Rochester, 120 Trustee Road, Rochester, New York 14627, United States
| | - Patrick L. Holland
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
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12
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Shin S, Cho H, Lee H, Nayab S, Kim Y. Zinc(II) complexes containing N′-aromatic group substituted N,N′,N-bis((1H-pyrazol-1-yl)methyl)amines: Synthesis, characterization, and polymerizations of methyl methacrylate and rac-lactide. J COORD CHEM 2018. [DOI: 10.1080/00958972.2018.1437266] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Sujin Shin
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu, Republic of Korea
| | - Hyungwoo Cho
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu, Republic of Korea
| | - Hyosun Lee
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu, Republic of Korea
| | - Saira Nayab
- Department of Chemistry, Shaheed Benazir Bhutto University, Sheringal Dir (U), Islamic Republic of Pakistan
| | - Younghak Kim
- Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, Republic of Korea
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13
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Polymerizations of methyl methacrylate and rac-lactide by 4-coordinate cobalt(II) complexes supported by N′-substituted N,N′,N-bis((1H-pyrazol-1-yl)methyl)amine derivatives. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.12.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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14
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Ohta S, Ohki Y. Impact of ligands and media on the structure and properties of biological and biomimetic iron-sulfur clusters. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.02.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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15
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Alemany P, Casanova D, Alvarez S, Dryzun C, Avnir D. Continuous Symmetry Measures: A New Tool in Quantum Chemistry. REVIEWS IN COMPUTATIONAL CHEMISTRY 2017. [DOI: 10.1002/9781119356059.ch7] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Pere Alemany
- Departament de Química Física and Institut de Química Teòrica i Computacional (IQTCUB); Universitat de Barcelona; Barcelona Spain
| | - David Casanova
- Donostia International Physics Center (DIPC); Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU); Donostia Spain
- IKERBASQUE, Basque Foundation for Science; Bilbao Spain
| | - Santiago Alvarez
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional (IQTCUB); Universitat de Barcelona; Barcelona Spain
| | - Chaim Dryzun
- Institute of Chemistry and The Lise Meitner Minerva Center for Computational Quantum Chemistry; The Hebrew University of Jerusalem; Jerusalem Israel
| | - David Avnir
- Institute of Chemistry and The Lise Meitner Minerva Center for Computational Quantum Chemistry; The Hebrew University of Jerusalem; Jerusalem Israel
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16
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Suzuki T, Masuda H, Fryzuk MD. Variable coordination geometries via an amine-tethered-enamidophosphinimine ligand on cobalt. Dalton Trans 2017; 46:6612-6622. [DOI: 10.1039/c7dt00930e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The enamidophosphinimine ligand scaffold decorated with a pendant 2-diethylamino-ethyl group can change its coordination mode upon reaction with hydride reagents or under reducing conditions when coordinated to cobalt.
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Affiliation(s)
- Tatsuya Suzuki
- Department of Chemistry
- The University of British Columbia
- Vancouver
- Canada
| | - Hideki Masuda
- Department of Frontier Materials
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya
- Japan 466-8555
| | - Michael D. Fryzuk
- Department of Chemistry
- The University of British Columbia
- Vancouver
- Canada
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17
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Agnew DW, Moore CE, Rheingold AL, Figueroa JS. Controlled cis Labilization of CO from Manganese(I) Mixed Carbonyl/Isocyanide Complexes: An Entry Point to Coordinatively Unsaturated Metallo-Lewis Acids. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00792] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Douglas W. Agnew
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
| | - Curtis E. Moore
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
| | - Arnold L. Rheingold
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
| | - Joshua S. Figueroa
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, Mail Code 0358, La Jolla, California 92093, United States
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18
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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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19
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Mondragón A, Martínez-Alanis PR, Aullón G, Hernández-Ortega S, Robles-Marín E, Flores-Alamo M, Ugalde-Saldívar VM, Castillo I. Redox flexibility of iron complexes supported by sulfur-based tris(o-methylenethiophenolato)amine relative to its tripodal oxygen-based congener. Dalton Trans 2016; 45:9996-10006. [DOI: 10.1039/c6dt00814c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Tripodal ligands designed to generate a local C3 symmetry have resulted in novel types of metal complexes that feature unusual bonding and electronic properties.
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Affiliation(s)
| | - Paulina R. Martínez-Alanis
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - Gabriel Aullón
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | | | - Elvis Robles-Marín
- Instituto de Química
- Universidad Nacional Autónoma de México
- México DF
- México
| | - Marcos Flores-Alamo
- Facultad de Química
- División de Estudios de Posgrado
- Universidad Nacional Autónoma de México
- México DF
- México
| | - Víctor M. Ugalde-Saldívar
- Facultad de Química
- División de Estudios de Posgrado
- Universidad Nacional Autónoma de México
- México DF
- México
| | - Ivan Castillo
- Instituto de Química
- Universidad Nacional Autónoma de México
- México DF
- México
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20
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Suzuki T, Wasada-Tsutsui Y, Ogawa T, Inomata T, Ozawa T, Sakai Y, Fryzuk MD, Masuda H. N2 activation by an iron complex with a strong electron-donating iminophosphorane ligand. Inorg Chem 2015; 54:9271-81. [PMID: 26135343 DOI: 10.1021/acs.inorgchem.5b00536] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new tridentate cyclopentane-bridged iminophosphorane ligand, N-(2-diisopropylphosphinophenyl)-P,P-diisopropyl-P-(2-(2,6-diisopropylphenylamido)cyclopent-1-enyl)phosphoranimine (NpNPiPr), was synthesized and used in the preparation of a diiron dinitrogen complex. The reaction of the iron complex FeBr(NpNPiPr) with KC8 under dinitrogen yielded the dinuclear dinitrogen Fe complex [Fe(NpNPiPr)]2(μ-N2), which was characterized by X-ray analysis and resonance Raman and NMR spectroscopies. The X-ray analysis revealed a diiron complex bridged by the dinitrogen molecule, with each metal center coordinated by an NpNPiPr ligand and dinitrogen in a trigonal-monopyramidal geometry. The N–N bond length is 1.184(6) Å, and resonance Raman spectra indicate that the N–N stretching mode ν(14N2/15N2) is 1755/1700 cm–1. The magnetic moment of [Fe(NpNPiPr)]2(μ-N2) in benzene-d6 solution, as measured by 1H NMR spectroscopy by the Evans method, is 6.91μB (S = 3). The Mössbauer spectrum at 78 K showed δ = 0.73 mm/s and ΔEQ = 1.83 mm/s. These findings suggest that the iron ions are divalent with a high-spin configuration and that the N2 molecule has (N═N)2– character. Density functional theory calculations performed on [Fe(NpNPiPr)]2(μ-N2) also suggested that the iron is in a high-spin divalent state and that the coordinated dinitrogen molecule is effectively activated by π back-donation from the two iron ions (dπ) to the dinitrogen molecule (πx* and πy*). This is supported by cooperation between a large negative charge on the iminophosphorane ligand and strong electron donation and effective orbital overlap between the iron dπ orbitals and N2 π* orbitals supplied by the phosphine ligand.
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Affiliation(s)
- Tatsuya Suzuki
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology , Gokiso, Showa, Nagoya 466-8555, Japan.,Department of Chemistry, The University of British Columbia , 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Yuko Wasada-Tsutsui
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology , Gokiso, Showa, Nagoya 466-8555, Japan
| | - Takahiko Ogawa
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology , Gokiso, Showa, Nagoya 466-8555, Japan
| | - Tomohiko Inomata
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology , Gokiso, Showa, Nagoya 466-8555, Japan
| | - Tomohiro Ozawa
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology , Gokiso, Showa, Nagoya 466-8555, Japan
| | - Yoichi Sakai
- Department of Chemistry, Daido University , Takiharu-cho, Minami-ku, Nagoya 457-8530, Japan
| | - Michael D Fryzuk
- Department of Chemistry, The University of British Columbia , 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Hideki Masuda
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology , Gokiso, Showa, Nagoya 466-8555, Japan
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21
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Del Castillo TJ, Thompson NB, Suess DLM, Ung G, Peters JC. Evaluating molecular cobalt complexes for the conversion of N2 to NH3. Inorg Chem 2015; 54:9256-62. [PMID: 26001022 DOI: 10.1021/acs.inorgchem.5b00645] [Citation(s) in RCA: 119] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Well-defined molecular catalysts for the reduction of N2 to NH3 with protons and electrons remain very rare despite decades of interest and are currently limited to systems featuring molybdenum or iron. This report details the synthesis of a molecular cobalt complex that generates superstoichiometric yields of NH3 (>200% NH3 per Co-N2 precursor) via the direct reduction of N2 with protons and electrons. While the NH3 yields reported herein are modest by comparison to those of previously described iron and molybdenum systems, they intimate that other metals are likely to be viable as molecular N2 reduction catalysts. Additionally, a comparison of the featured tris(phosphine)borane Co-N2 complex with structurally related Co-N2 and Fe-N2 species shows how remarkably sensitive the N2 reduction performance of potential precatalysts is. These studies enable consideration of the structural and electronic effects that are likely relevant to N2 conversion activity, including the π basicity, charge state, and geometric flexibility.
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Affiliation(s)
- Trevor J Del Castillo
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
| | - Niklas B Thompson
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
| | - Daniel L M Suess
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
| | - Gaël Ung
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
| | - Jonas C Peters
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
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22
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Ohki Y. Synthetic Analogues of the Active Sites of Nitrogenase and [NiFe] Hydrogenase. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2014. [DOI: 10.1246/bcsj.20130207] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yasuhiro Ohki
- Department of Chemistry, Graduate School of Science, Nagoya University
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23
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Fe-N2/CO complexes that model a possible role for the interstitial C atom of FeMo-cofactor (FeMoco). Proc Natl Acad Sci U S A 2013; 110:15898-903. [PMID: 24043796 DOI: 10.1073/pnas.1310153110] [Citation(s) in RCA: 105] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We report here a series of four- and five-coordinate Fe model complexes that feature an axial tri(silyl)methyl ligand positioned trans to a substrate-binding site. This arrangement is used to crudely model a single-belt Fe site of the FeMo-cofactor that might bind N2 at a position trans to the interstitial C atom. Reduction of a trigonal pyramidal Fe(I) complex leads to uptake of N2 and subsequent functionalization furnishes an open-shell Fe-diazenido complex. A related series of five-coordinate Fe-CO complexes stable across three redox states is also described. Spectroscopic, crystallographic, and Density Functional Theory (DFT) studies of these complexes suggest that a decrease in the covalency of the Fe-C(alkyl) interaction occurs upon reduction and substrate binding. This leads to unusually long Fe-C(alkyl) bond distances that reflect an ionic Fe-C bond. The data presented are contextualized in support of a hypothesis wherein modulation of a belt Fe-C interaction in the FeMo-cofactor facilitates substrate binding and reduction.
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24
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Chandrasekaran P, Chiang KP, Nordlund D, Bergmann U, Holland PL, DeBeer S. Sensitivity of X-ray core spectroscopy to changes in metal ligation: a systematic study of low-coordinate, high-spin ferrous complexes. Inorg Chem 2013; 52:6286-98. [PMID: 23662855 DOI: 10.1021/ic3021723] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In order to assess the sensitivity and complementarity of X-ray absorption and emission spectroscopies for determining changes in the metal ligation sphere, a systematic experimental and theoretical study of iron model complexes has been carried out. A series of high-spin ferrous complexes, in which the ligation sphere has been varied from a three-coordinate complex, [L(tBu)Fe(SPh)] (1) (where L(tBu) = bulky β-diketiminate ligand; SPh = phenyl thiolate) to four-coordinate complexes [L(tBu)Fe(SPh)(X)] (where X = CN(t)Bu (2); 1-methylimidazole (3); or N,N-dimethylformamide (DMF) (4)), has been investigated using a combination of Fe K-edge X-ray absorption (XAS) and Kβ X-ray emission (XES) spectroscopies. The Fe K XAS pre-edge and edge of all four complexes are consistent with a high-spin ferrous assignment, with the largest differences in the pre-edge intensities attributed to changes in covalency of the fourth coordination site. The X-ray emission spectra show pronounced changes in the valence to core region (V2C) as the identity of the coordinated ligand is varied. The experimental results have been correlated to density functional theory (DFT) calculations, to understand key molecular orbital contributions to the observed absorption and emission features. The calculations also have been extended to a series of hypothetical high-spin iron complexes to understand the sensitivity of XAS and XES techniques to different ligand protonation states ([L(tBu)Fe(II)(SPh)(NHn)](3-n) (n = 3, 2, 1, 0)), metal oxidation states [L(tBu)Fe(SPh)(N)](n-) (n = 3, 2, 1), and changes in the ligand identity [L(tBu)Fe(IV)(SPh)(X)](n-) (X = C(4-), N(3-), O(2-); n = 2, 1, 0). This study demonstrates that XAS pre-edge data have greater sensitivity to changes in oxidation state, while valence to core (V2C) XES data provide a more sensitive probe of ligand identity and protonation state. The combination of multiple X-ray spectroscopic methods with DFT results thus has the potential to provide for detailed characterization of complex inorganic systems in both chemical and biological catalysis.
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Affiliation(s)
- P Chandrasekaran
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA
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25
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Kruck M, Wadepohl H, Enders M, Gade LH. Giant Residual Dipolar13C-1H Couplings in High-Spin Organoiron Complexes: Elucidation of Their Structures in Solution by13C NMR Spectroscopy. Chemistry 2013; 19:1599-606. [DOI: 10.1002/chem.201203450] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Indexed: 11/11/2022]
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26
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Chen XD, Zhang W, Duncan JS, Lee SC. Iron–Amide–Sulfide and Iron–Imide–Sulfide Clusters: Heteroligated Core Environments Relevant to the Nitrogenase FeMo Cofactor. Inorg Chem 2012; 51:12891-904. [DOI: 10.1021/ic301868m] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Xu-Dong Chen
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L
3G1
| | - Wei Zhang
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L
3G1
| | - Jeremiah S. Duncan
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L
3G1
| | - Sonny C. Lee
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L
3G1
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27
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Ohta S, Ohki Y, Hashimoto T, Cramer RE, Tatsumi K. A Nitrogenase Cluster Model [Fe8S6O] with an Oxygen Unsymmetrically Bridging Two Proto-Fe4S3 Cubes: Relevancy to the Substrate Binding Mode of the FeMo Cofactor. Inorg Chem 2012; 51:11217-9. [DOI: 10.1021/ic301348f] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shun Ohta
- Department of Chemistry, Graduate School of Science, and Research Center for Meterials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602,
Japan
| | - Yasuhiro Ohki
- Department of Chemistry, Graduate School of Science, and Research Center for Meterials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602,
Japan
| | - Takayoshi Hashimoto
- Department of Chemistry, Graduate School of Science, and Research Center for Meterials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602,
Japan
| | - Roger E. Cramer
- Department
of Chemistry, University of Hawaii, Honolulu, Hawaii
96822, United States
| | - Kazuyuki Tatsumi
- Department of Chemistry, Graduate School of Science, and Research Center for Meterials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602,
Japan
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28
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Lamberti M, D’Auria I, Mazzeo M, Milione S, Bertolasi V, Pappalardo D. Phenoxy-Thioether Aluminum Complexes as ε-Caprolactone and Lactide Polymerization Catalysts. Organometallics 2012. [DOI: 10.1021/om300505m] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Marina Lamberti
- Dipartimento di Chimica e Biologia, Università di Salerno, via Ponte don Melillo, I-84084, Fisciano,
Salerno, Italy
| | - Ilaria D’Auria
- Dipartimento di Chimica e Biologia, Università di Salerno, via Ponte don Melillo, I-84084, Fisciano,
Salerno, Italy
| | - Mina Mazzeo
- Dipartimento di Chimica e Biologia, Università di Salerno, via Ponte don Melillo, I-84084, Fisciano,
Salerno, Italy
| | - Stefano Milione
- Dipartimento di Chimica e Biologia, Università di Salerno, via Ponte don Melillo, I-84084, Fisciano,
Salerno, Italy
| | - Valerio Bertolasi
- Dipartimento di Chimica e Centro di Strutturistica
Diffrattometrica, Università di Ferrara, I-44100
Ferrara, Italy
| | - Daniela Pappalardo
- Dipartimento di Scienze per la Biologia, la
Geologia e l’Ambiente, Università del Sannio, via dei
Mulini 59/A, I-82100, Benevento, Italy
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29
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Cowley RE, Holland PL. Ligand effects on hydrogen atom transfer from hydrocarbons to three-coordinate iron imides. Inorg Chem 2012; 51:8352-61. [PMID: 22800175 DOI: 10.1021/ic300870y] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new β-diketiminate ligand with 2,4,6-tri(phenyl)phenyl N-substituents provides protective bulk around the metal without exposing any weak C-H bonds. This ligand improves the stability of reactive iron(III) imido complexes with Fe═NAd and Fe═NMes functional groups (Ad = 1-adamantyl; Mes = mesityl). The new ligand gives iron(III) imido complexes that are significantly more reactive toward 1,4-cyclohexadiene than the previously reported 2,6-diisopropylphenyl diketiminate variants. Analysis of X-ray crystal structures implicates Fe═N-C bending, a longer Fe═N bond, and greater access to the metal as potential reasons for the increase in C-H bond activation rates.
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Affiliation(s)
- Ryan E Cowley
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
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30
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Takada R, Hirotsu M, Nishioka T, Hashimoto H, Kinoshita I. Sulfur-Bridged Ta–M (M = Mo, Cr) Multinuclear Complexes Bearing a Four-Electron-Reduced Dinitrogen Ligand. Organometallics 2011. [DOI: 10.1021/om200596v] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Ryoichi Takada
- Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Masakazu Hirotsu
- Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Takanori Nishioka
- Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
- CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Hideki Hashimoto
- Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
- CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
- The OCU Advanced Research Institute for Natural Science and Technology (OCARINA), Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Isamu Kinoshita
- Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
- CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
- The OCU Advanced Research Institute for Natural Science and Technology (OCARINA), Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
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31
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Ding K, Zannat F, Morris JC, Brennessel WW, Holland PL. Coordination of N-methylpyrrolidone to iron(II). J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2009.09.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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32
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Ding K, Dugan TR, Brennessel WW, Bill E, Holland PL. Synthesis, Properties, and Reactivity of Diketiminate-Supported Cobalt Fluoride Complexes. Organometallics 2009. [DOI: 10.1021/om900394t] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Keying Ding
- Department of Chemistry, University of Rochester, Rochester, New York 14627, and Max-Planck-Institut für Bioanorganische Chemie, Mülheim an der Ruhr D45470, Germany
| | - Thomas R. Dugan
- Department of Chemistry, University of Rochester, Rochester, New York 14627, and Max-Planck-Institut für Bioanorganische Chemie, Mülheim an der Ruhr D45470, Germany
| | - William W. Brennessel
- Department of Chemistry, University of Rochester, Rochester, New York 14627, and Max-Planck-Institut für Bioanorganische Chemie, Mülheim an der Ruhr D45470, Germany
| | - Eckhard Bill
- Department of Chemistry, University of Rochester, Rochester, New York 14627, and Max-Planck-Institut für Bioanorganische Chemie, Mülheim an der Ruhr D45470, Germany
| | - Patrick L. Holland
- Department of Chemistry, University of Rochester, Rochester, New York 14627, and Max-Planck-Institut für Bioanorganische Chemie, Mülheim an der Ruhr D45470, Germany
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33
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Chiang KP, Barrett PM, Ding F, Smith JM, Kingsley S, Brennessel WW, Clark MM, Lachicotte RJ, Holland PL. Ligand dependence of binding to three-coordinate Fe(II) complexes. Inorg Chem 2009; 48:5106-16. [PMID: 19438179 DOI: 10.1021/ic802440h] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of three- and four-coordinate iron(II) complexes with nitrogen, chlorine, oxygen, and sulfur ligands is presented. The electronic variation is explored by measuring the association constant of the neutral ligands and the reduction potential of the iron(II) complexes. Varying the neutral ligand gives large changes in K(eq), which decrease in the order CN(t)Bu > pyridine >2-picoline > DMF > MeCN > THF > PPh(3). These differences can be attributed to a mixture of steric effects and electronic effects (both sigma-donation and pi-backbonding). The binding constants and the reduction potentials are surprisingly insensitive to changes in an anionic spectator ligand. This suggests that three-coordinate iron(II) complexes may have similar binding trends as proposed three-coordinate iron(II) intermediates in the FeMoco of nitrogenase, even though the anionic spectator ligands in the synthetic complexes differ from the sulfides in the FeMoco.
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Affiliation(s)
- Karen P Chiang
- Department of Chemistry, University of Rochester, Rochester, New York 14627, USA
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34
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Pinsky M, Dryzun C, Casanova D, Alemany P, Avnir D. Analytical methods for calculating Continuous Symmetry Measures and the Chirality Measure. J Comput Chem 2008; 29:2712-21. [PMID: 18484634 DOI: 10.1002/jcc.20990] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We provide analytical solutions of the Continuous Symmetry Measure (CSM) equation for several symmetry point-groups, and for the associated Continuous Chirality Measure (CCM), which are quantitative estimates of the degree of a symmetry-point group or chirality in a structure, respectively. We do it by solving analytically the problem of finding the minimal distance between the original structure and the result obtained by operating on it all of the operations of a specific G symmetry point group. Specifically, we provide solutions for the symmetry measures of all of the improper rotations point group symmetries, S(n), including the mirror (S(1), C(S)), inversion (S(2), C(i)) as well as the higher S(n)s (n > 2 is even) point group symmetries, for the rotational C(2) point group symmetry, for the higher rotational C(n) symmetries (n > 2), and finally for the C(nh) symmetry point group. The chirality measure is the minimal of all S(n) measures.
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Affiliation(s)
- Mark Pinsky
- Institute of Chemistry and The Lise Meitner Minerva Center for Computational Quantum Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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Zhang CX, Ma CB, Zhang Y, Hu MQ, Chen CN, Liu QT. Synthesis and Characterization of Two Linear Fe-M-S Clusters Coordinated by Bis(pyrid-2-ylmethyl)amine(BPA): [(BPA)(DMF)FeS2MS2] (M = Mo, W). Z Anorg Allg Chem 2008. [DOI: 10.1002/zaac.200800024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Stasch A, Forsyth CM, Jones C, Junk PC. Thermally stable lead(ii) amidinates and guanidinates. NEW J CHEM 2008. [DOI: 10.1039/b718537e] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Yang L, Powell DR, Houser RP. Structural variation in copper(I) complexes with pyridylmethylamide ligands: structural analysis with a new four-coordinate geometry index, tau4. Dalton Trans 2007:955-64. [PMID: 17308676 DOI: 10.1039/b617136b] [Citation(s) in RCA: 2262] [Impact Index Per Article: 133.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four Cu(I) complexes were synthesized with a family of pyridylmethylamide ligands, HL(R) [HL(R) = N-(2-pyridylmethyl)acetamide, R = null; 2,2-dimethyl-N-(2-pyridylmethyl)propionamide, R = Me(3); 2,2,2-triphenyl-N-(2-pyridylmethyl)acetamide, R = Ph(3))]. Complexes 1-3 were synthesized from the respective ligand and [Cu(CH(3)CN)(4)]PF(6) in a 2 : 1 molar ratio: [Cu(HL)(2)]PF(6) (1), [Cu(2)(HL(Me3))(4)](PF(6))(2) (2), [Cu(HL(Ph3))(2)]PF(6) (3). Complex 4, [Cu(HL)(CH(3)CN)(PPh(3))]PF(6), was synthesized from the reaction of HL with [Cu(CH(3)CN)(4)]PF(6) and PPh(3) in a 1 : 1 : 1 molar ratio. X-Ray crystal structures reveal that complexes 1, 3 and 4 are mononuclear Cu(I) species, while complex 2 is a Cu(I) dimer. The copper ions are four-coordinate with geometries ranging from distorted tetrahedral to seesaw in 1, 2, and 4. Complexes 1 and 2 are very air sensitive and they display similar electrochemical properties. The coordination geometry of complex 3 is nearly linear, two-coordinate. Complex 3 is exceptionally stable with respect to oxidation in the air, and its cyclic voltammetry shows no oxidation wave in the range of 0-1.5 V. The unusual inertness of complex 3 towards oxidation is attributed to the protection from bulky triphenyl substituent of the HL(Ph3) ligand. A new geometric parameter for four-coordinate compounds, tau(4), is proposed as an improved, simple metric for quantitatively evaluating the geometry of four-coordinate complexes and compounds.
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Affiliation(s)
- Lei Yang
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, USA
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