101
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Sekiguchi Y, Arashiba K, Tanaka H, Eizawa A, Nakajima K, Yoshizawa K, Nishibayashi Y. Catalytic Reduction of Molecular Dinitrogen to Ammonia and Hydrazine Using Vanadium Complexes. Angew Chem Int Ed Engl 2018; 57:9064-9068. [DOI: 10.1002/anie.201802310] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 03/27/2018] [Indexed: 12/12/2022]
Affiliation(s)
- Yoshiya Sekiguchi
- Department of Systems Innovation; School of Engineering; University of Tokyo, Bunkyo-ku; Tokyo 113-8656 Japan
| | - Kazuya Arashiba
- Department of Systems Innovation; School of Engineering; University of Tokyo, Bunkyo-ku; Tokyo 113-8656 Japan
| | - Hiromasa Tanaka
- Institute for Materials Chemistry and Engineering; Kyushu University; Nishi-ku Fukuoka 819-0395 Japan
| | - Aya Eizawa
- Department of Systems Innovation; School of Engineering; University of Tokyo, Bunkyo-ku; Tokyo 113-8656 Japan
| | - Kazunari Nakajima
- Department of Systems Innovation; School of Engineering; University of Tokyo, Bunkyo-ku; Tokyo 113-8656 Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering; Kyushu University; Nishi-ku Fukuoka 819-0395 Japan
| | - Yoshiaki Nishibayashi
- Department of Systems Innovation; School of Engineering; University of Tokyo, Bunkyo-ku; Tokyo 113-8656 Japan
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102
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Sekiguchi Y, Arashiba K, Tanaka H, Eizawa A, Nakajima K, Yoshizawa K, Nishibayashi Y. Catalytic Reduction of Molecular Dinitrogen to Ammonia and Hydrazine Using Vanadium Complexes. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201802310] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yoshiya Sekiguchi
- Department of Systems Innovation; School of Engineering; University of Tokyo, Bunkyo-ku; Tokyo 113-8656 Japan
| | - Kazuya Arashiba
- Department of Systems Innovation; School of Engineering; University of Tokyo, Bunkyo-ku; Tokyo 113-8656 Japan
| | - Hiromasa Tanaka
- Institute for Materials Chemistry and Engineering; Kyushu University; Nishi-ku Fukuoka 819-0395 Japan
| | - Aya Eizawa
- Department of Systems Innovation; School of Engineering; University of Tokyo, Bunkyo-ku; Tokyo 113-8656 Japan
| | - Kazunari Nakajima
- Department of Systems Innovation; School of Engineering; University of Tokyo, Bunkyo-ku; Tokyo 113-8656 Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering; Kyushu University; Nishi-ku Fukuoka 819-0395 Japan
| | - Yoshiaki Nishibayashi
- Department of Systems Innovation; School of Engineering; University of Tokyo, Bunkyo-ku; Tokyo 113-8656 Japan
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103
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Shupp JP, Rose AR, Rose MJ. Synthesis and interconversions of reduced, alkali-metal supported iron-sulfur-carbonyl complexes. Dalton Trans 2018; 46:9163-9171. [PMID: 28675227 DOI: 10.1039/c7dt01506b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
We report the synthesis, interconversions and X-ray structures of a set of [mFe-nS]-type carbonyl clusters (where S = S2-, S22- or RS-; m = 2-3; n = 1-2). All of the clusters have been identified and characterized by single crystal X-ray diffraction, IR and 13C NMR. Reduction of the parent neutral dimer [μ2-(SPh)2Fe2(CO)6] (1) with KC8 affords an easily separable ∼1 : 1 mixture of the anionic, dimeric thiolate dimer K[Fe2(SPh)(CO)6(μ-CO)] (2) and the dianionic, sulfido trimer [K(benzo-15-crown-5)2]2[Fe3(μ3-S)(CO)9] (3). Oxidation of 2 with diphenyl-disulfide (Ph2S2) cleanly returns the starting material 1. The Ph-S bond in 1 can be cleaved to form sulfide trimer 3. Oxidation of sulfido trimer 3 with [Fc](PF6) in the presence of S8 cleanly affords the all-inorganic persulfide dimer [μ2-(S)2Fe2(CO)6] (4), a thermodynamically stable product. The inverse reactions to form 3 (dianion) from 4 (neutral) were not successful, and other products were obtained. For example, reduction of 4 with KC8 afforded the mixed valence Fe(i)/Fe(ii) species [((FeS2)(CO)6)2FeII]2- (5), in which the two {Fe2S2(CO)6}2- units serve as bidendate ligands to a Fe(ii) center. Another isolated product (THF insoluble portion) was recrystallized in MeCN to afford [K(benzo-15-crown-5)2]2[((Fe2S)(CO)6)2(μ-S)2] (6), in which a persulfide dianion bridges two {2Fe-S} moieties (dimer of dimers). Finally, to close the interconversion loop, we converted the persulfide dimer 4 into the thiolate dimer 1 by reduction with KC8 followed by reaction with the diphenyl iodonium salt [Ph2I](PF6), in modest yield. These reactions underscore the thermodynamic stability of the dimers 1 and 4, as well as the synthetic and crystallization versatility of using the crown/K+ counterion system for obtaining structural information on highly reduced iron-sulfur-carbonyl clusters.
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Affiliation(s)
- J Patrick Shupp
- Department of Chemistry, The University of Texas at Austin, USA.
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104
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Reed CJ, Agapie T. Tetranuclear Fe Clusters with a Varied Interstitial Ligand: Effects on the Structure, Redox Properties, and Nitric Oxide Activation. Inorg Chem 2018; 56:13360-13367. [PMID: 29052979 DOI: 10.1021/acs.inorgchem.7b02114] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A new series of tetranuclear Fe clusters displaying an interstitial μ4-F ligand was prepared for a comparison to previously reported μ4-O analogues. With a single nitric oxide (NO) coordinated as a reporter of small-molecule activation, the μ4-F clusters were characterized in five redox states, from FeII3{FeNO}8 to FeIII3{FeNO}7, with NO stretching frequencies ranging from 1680 to 1855 cm-1, respectively. Despite accessing more reduced states with an F- bridge, a two-electron reduction of the distal Fe centers is necessary for the μ4-F clusters to activate NO to the same degree as the μ4-O system; consequently, NO reactivity is observed at more positive potentials with μ4-O than μ4-F. Moreover, the μ4-O ligand better translates redox changes of remote metal centers to diatomic ligand activation. The implication for biological active sites is that the higher-charge bridging ligand is more effective in tuning cluster properties, including the involvement of remote metal centers, for small-molecule activation.
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Affiliation(s)
- Christopher J Reed
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
| | - Theodor Agapie
- Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States
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105
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Krewald V, González L. A Valence-Delocalised Osmium Dimer capable of Dinitrogen Photocleavage: Ab Initio Insights into Its Electronic Structure. Chemistry 2018; 24:5112-5123. [DOI: 10.1002/chem.201704651] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Vera Krewald
- Institute for Theoretical Chemistry, Faculty of Chemistry; University of Vienna; Währingerstr. 17 1090 Vienna Austria
- Department of Chemistry; University of Bath; Claverton Down Bath BA2 7AY UK
| | - Leticia González
- Institute for Theoretical Chemistry, Faculty of Chemistry; University of Vienna; Währingerstr. 17 1090 Vienna Austria
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106
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Bai Y, Zhang J, Cui C. An arene-tethered silylene ligand enabling reversible dinitrogen binding to iron and catalytic silylation. Chem Commun (Camb) 2018; 54:8124-8127. [DOI: 10.1039/c8cc03734e] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A silylene–iron(0) dinitrogen complex enabled the catalytic silylation of N2 with high activity.
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Affiliation(s)
- Yunping Bai
- State Key Laboratory of Elemento-organic Chemistry and College of Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Jianying Zhang
- State Key Laboratory of Elemento-organic Chemistry and College of Chemistry
- Nankai University
- Tianjin 300071
- China
| | - Chunming Cui
- State Key Laboratory of Elemento-organic Chemistry and College of Chemistry
- Nankai University
- Tianjin 300071
- China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
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107
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Misawa-Suzuki T, Matsuya K, Watanabe T, Nagao H. Triply bridged dinuclear ruthenium complexes bearing alkylbis(2-pyridylmethyl)amine in the mixed-valence state of Ru(ii)–Ru(iii). Dalton Trans 2018; 47:16182-16189. [DOI: 10.1039/c8dt03507e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Five diruthenium complexes in the mixed-valence state of Ru(ii)–Ru(iii), triply bridged by halogeno and methoxido ligands, were newly synthesized and compared.
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Affiliation(s)
- T. Misawa-Suzuki
- Department of Materials and Life Sciences
- Sophia University
- Tokyo 102-8554
- Japan
| | - K. Matsuya
- Department of Materials and Life Sciences
- Sophia University
- Tokyo 102-8554
- Japan
| | - T. Watanabe
- Department of Materials and Life Sciences
- Sophia University
- Tokyo 102-8554
- Japan
| | - H. Nagao
- Department of Materials and Life Sciences
- Sophia University
- Tokyo 102-8554
- Japan
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108
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Zhang Y, Mei T, Yang D, Zhang Y, Wang B, Qu J. Synthesis and reactivity of thiolate-bridged multi-iron complexes supported by cyclic (alkyl)(amino)carbene. Dalton Trans 2017; 46:15888-15896. [PMID: 29116275 DOI: 10.1039/c7dt03353b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The combined utilization of Me2-cAAC (Me2-cAAC = :C(CH2)(CMe2)2N-2,6-iPr2C6H3) and thiolates as supporting ligands enables the access of unprecedented carbene coordinated thiolate-bridged diiron(ii) complexes [(Me2-cAAC)Fe(μ-SR)(Br)]2 (R = Me, 3; R = Et, 4). The coordination environment of each tetrahedral iron(ii) center in complexes 3 and 4 is composed of one terminal bromide atom, one carbene carbon atom and two thiolate sulfur atoms, which is similar to the carbide-containing sulfur-rich environment of iron centers in the belt region of the FeMo-cofactor. Interestingly, when NaSCPh3 was chosen as the thiolate ligand, C-S bond homolysis occurred to form a rare [3 : 1] site-differentiated cubane-type cluster [(Me2-cAAC)Fe4S4(Br)3][Me2-cAACH] (5). Furthermore, complexes 3 and 4 exhibit good exchange reactivity toward the azide anion to give novel thiolate-bridged diiron complexes with two azido ligands in a trans arrangement.
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Affiliation(s)
- Yanpeng Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P. R. China
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109
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Manz DH, Duan PC, Dechert S, Demeshko S, Oswald R, John M, Mata RA, Meyer F. Pairwise H 2/D 2 Exchange and H 2 Substitution at a Bimetallic Dinickel(II) Complex Featuring Two Terminal Hydrides. J Am Chem Soc 2017; 139:16720-16731. [PMID: 29037034 DOI: 10.1021/jacs.7b08629] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A compartmental ligand scaffold HL with two β-diketiminato binding sites spanned by a pyrazolate bridge gave a series of dinuclear nickel(II) dihydride complexes M[LNi2(H)2], M = Na (Na·2) and K (K·2), which were isolated after reacting the precursor complex [LNi2(μ-Br)] (1) with MHBEt3 (M = Na and K). Crystallographic characterization showed the two hydride ligands to be directed into the bimetallic pocket, closely interacting with the alkali metal cation. Treatment of K·2 with dibenzo(18-crown-6) led to the separated ion pair [LNi2(H)2][K(DB18C6)] (2[K(DB18C6)]). Reaction of Na·2 or K·2 with D2 was investigated by a suite of 1H and 2H NMR experiments, revealing an unusual pairwise H2/D2 exchange process that synchronously involves both Ni-H moieties without H/D scrambling. A mechanistic picture was provided by DFT calculations which suggested facile recombination of the two terminal hydrides within the bimetallic cleft, with a moderate enthalpic barrier of ∼62 kJ/mol, to give H2 and an antiferromagnetically coupled [LNiI2]- species. This was confirmed by SQUID monitoring during H2 release from solid 2[K(DB18C6)]. Interaction with the Lewis acid cation (Na+ or K+) significantly stabilizes the dihydride core. Kinetic data for the M[L(Ni-H)2] → H2 transition derived from 2D 1H EXSY spectra confirmed first-order dependence of H2 release on M·2 concentration and a strong effect of the alkali metal cation M+. Treating [LNi2(D)2]- with phenylacetylene led to D2 and dinickel(II) complex 3- with a twice reduced styrene-1,2-diyl bridging unit in the bimetallic pocket. Complexes [LNiII2(H)2]- having two adjacent terminal hydrides thus represent a masked version of a highly reactive dinickel(I) core. Storing two reducing equivalents in adjacent metal hydrides that evolve H2 upon substrate binding is reminiscent of the proposed N2 binding step at the FeMo cofactor of nitrogenase, suggesting the use of the present bimetallic scaffold for reductive bioinspired activation of a range of inert small molecules.
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Affiliation(s)
- Dennis-Helmut Manz
- Institut für Anorganische Chemie, Universität Göttingen , Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Peng-Cheng Duan
- Institut für Anorganische Chemie, Universität Göttingen , Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Sebastian Dechert
- Institut für Anorganische Chemie, Universität Göttingen , Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Serhiy Demeshko
- Institut für Anorganische Chemie, Universität Göttingen , Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Rainer Oswald
- Institut für Physikalische Chemie, Universität Göttingen , Tammannstrasse 6, D-37077 Göttingen, Germany
| | - Michael John
- Institut für Anorganische Chemie, Universität Göttingen , Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Ricardo A Mata
- Institut für Physikalische Chemie, Universität Göttingen , Tammannstrasse 6, D-37077 Göttingen, Germany
| | - Franc Meyer
- Institut für Anorganische Chemie, Universität Göttingen , Tammannstrasse 4, D-37077 Göttingen, Germany
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110
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Liang Q, Song D. Reactivity of Fe and Ru Complexes of Picolyl-Substituted N-Heterocyclic Carbene Ligand: Diverse Coordination Modes and Small Molecule Binding. Inorg Chem 2017; 56:11956-11970. [DOI: 10.1021/acs.inorgchem.7b01918] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Qiuming Liang
- Davenport Chemical Research
Laboratories, Department of Chemistry, University of Toronto, 80 St. George
Street, Toronto, Ontario, M5S 3H6, Canada
| | - Datong Song
- Davenport Chemical Research
Laboratories, Department of Chemistry, University of Toronto, 80 St. George
Street, Toronto, Ontario, M5S 3H6, Canada
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111
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Zhang Y, Tong P, Yang D, Li J, Wang B, Qu J. Migratory insertion and hydrogenation of a bridging azide in a thiolate-bridged dicobalt reaction platform. Chem Commun (Camb) 2017; 53:9854-9857. [PMID: 28825085 DOI: 10.1039/c7cc05092e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A novel well-defined thiolate-bridged dicobalt azido complex is converted to a rare sulfilimide-bridged dicobalt complex via nitrogen atom migratory insertion into the Co-S bond upon thermolysis. Intriguingly, the homolytic cleavage of hydrogen is achieved by this azide under mild conditions to furnish a partially hydrogenated azido complex.
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Affiliation(s)
- Yixin Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. China.
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112
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Sickerman NS, Tanifuji K, Hu Y, Ribbe MW. Synthetic Analogues of Nitrogenase Metallocofactors: Challenges and Developments. Chemistry 2017; 23:12425-12432. [DOI: 10.1002/chem.201702496] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Nathaniel S. Sickerman
- Department of Molecular Biology and Biochemistry University of California, Irvine Irvine CA 92697-3900 USA
| | - Kazuki Tanifuji
- Department of Molecular Biology and Biochemistry University of California, Irvine Irvine CA 92697-3900 USA
| | - Yilin Hu
- Department of Molecular Biology and Biochemistry University of California, Irvine Irvine CA 92697-3900 USA
| | - Markus W. Ribbe
- Department of Molecular Biology and Biochemistry University of California, Irvine Irvine CA 92697-3900 USA
- Department of Chemistry University of California, Irvine Irvine CA 92697-2025 USA
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113
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Arnet NA, McWilliams SF, DeRosha DE, Mercado BQ, Holland PL. Synthesis and Mechanism of Formation of Hydride-Sulfide Complexes of Iron. Inorg Chem 2017; 56:9185-9193. [PMID: 28726395 DOI: 10.1021/acs.inorgchem.7b01230] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Iron-sulfide complexes with hydride ligands provide an experimental precedent for spectroscopically detected hydride species on the iron-sulfur MoFe7S9C cofactor of nitrogenase. In this contribution, we expand upon our recent synthesis of the first iron sulfide hydride complex from an iron hydride and a sodium thiolate ( Arnet, N. A.; Dugan, T. R.; Menges, F. S.; Mercado, B. Q.; Brennessel, W. W.; Bill, E.; Johnson, M. A.; Holland, P. L., J. Am. Chem. Soc. 2015 , 137 , 13220 - 13223 ). First, we describe the isolation of an analogous iron sulfide hydride with a smaller diketiminate supporting ligand, which benefits from easier preparation of the hydride precursor and easier isolation of the product. Second, we describe mechanistic studies on the C-S bond cleavage through which the iron sulfide hydride product is formed. In a key experiment, use of cyclopropylmethanethiolate as the sulfur precursor leads to products from cyclopropane ring opening, implicating an alkyl radical as an intermediate. Combined with the results of isotopic labeling studies, the data are consistent with a mechanism in which homolytic C-S bond cleavage is followed by rebound of the alkyl radical to abstract a hydrogen atom from iron to give the observed alkane and iron-sulfide products.
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Affiliation(s)
- Nicholas A Arnet
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06511, United States
| | - Sean F McWilliams
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06511, United States
| | - Daniel E DeRosha
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06511, United States
| | - Brandon Q Mercado
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06511, United States
| | - Patrick L Holland
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06511, United States
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114
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Imayoshi R, Nakajima K, Takaya J, Iwasawa N, Nishibayashi Y. Synthesis and Reactivity of Iron- and Cobalt-Dinitrogen Complexes Bearing PSiP-Type Pincer Ligands toward Nitrogen Fixation. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700569] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ryuji Imayoshi
- Department of Systems Innovation; School of Engineering; The University of Tokyo; Hongo, Bunkyo-ku 113-8656 Tokyo Japan
| | - Kazunari Nakajima
- Department of Systems Innovation; School of Engineering; The University of Tokyo; Hongo, Bunkyo-ku 113-8656 Tokyo Japan
| | - Jun Takaya
- Department of Chemistry; Tokyo Institute of Technology; O-okayama, Meguro-ku 152-8551 Tokyo Japan
| | - Nobuharu Iwasawa
- Department of Chemistry; Tokyo Institute of Technology; O-okayama, Meguro-ku 152-8551 Tokyo Japan
| | - Yoshiaki Nishibayashi
- Department of Systems Innovation; School of Engineering; The University of Tokyo; Hongo, Bunkyo-ku 113-8656 Tokyo Japan
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115
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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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116
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Thompson CV, Arman HD, Tonzetich ZJ. A Pyrrole-Based Pincer Ligand Permits Access to Three Oxidation States of Iron in Organometallic Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00144] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- C. Vance Thompson
- Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, Texas 78249, United States
| | - Hadi D. Arman
- Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, Texas 78249, United States
| | - Zachary J. Tonzetich
- Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, Texas 78249, United States
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117
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Kuppuswamy S, Wofford JD, Joseph C, Xie ZL, Ali AK, Lynch VM, Lindahl PA, Rose MJ. Structures, Interconversions, and Spectroscopy of Iron Carbonyl Clusters with an Interstitial Carbide: Localized Metal Center Reduction by Overall Cluster Oxidation. Inorg Chem 2017; 56:5998-6012. [PMID: 28441025 DOI: 10.1021/acs.inorgchem.7b00741] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The syntheses, interconversions, and spectroscopic properties of a set of iron carbonyl clusters containing an interstitial carbide are reported. This includes the low temperature X-ray structures of the six-iron clusters (Y)2[Fe6(μ6-C)(μ2-CO)4(CO)12] (1a-c; where Y = NMe4, NEt4, PPh4); the five-iron cluster [Fe5(μ5-C)(CO)15] (3); and the novel formulation of the five-iron cluster (NMe4)2[Fe5(μ5-C)(μ2-CO)(CO)13] (4). Also included in this set is the novel charge-neutral cluster, [Fe6(μ6-C)(CO)18] (2), for which we were unable to obtain a crystallographic structure. As synthetic proof for the identity of 2, we performed a closed loop of interconversions within a family of crystallographically defined species (1, 3, and 4): [Fe6]2- → [Fe6]0 → [Fe5]0 → [Fe5]2- → [Fe6]2-. The structural, spectroscopic, and electronic properties of this "missing link" cluster 2 were investigated by IR, Raman, XPS, and Mössbauer spectroscopies-as well as by DFT calculations. A single νCO feature (1965 cm-1) in the IR spectrum of 2, as well as a prominent Raman feature (νsymm = 1550 cm-1), are consistent with the presence of terminal carbonyls and a {(μ6-C)Fe6} arrangement of iron centers around the central carbide. The XPS of 2 exhibits a higher energy Fe 2p3/2 feature (707.4 eV) as compared to that of 1 (705.5 eV), consistent with the two-electron oxidation induced by treatment of 1 with two equivalents of [Fc](PF6) under CO atmosphere (for the two added CO ligands). DFT calculations indicate two axial and four equatorial Fe sites in 1, all of which have the same or similar oxidation states, for example, two Fe(0) and four Fe(+0.5). These assignments are supported by Mössbauer spectra for 1, which exhibit two closely spaced quadrupole doublets with δ = 0.076 and 0.064 mm s-1. The high-field Mössbauer spectrum of 2 (4.2 K) exhibits three prominent quadrupole doublets with δ = -0.18, -0.11, and +0.41 mm s-1. This indicates three pairs of chemically equivalent Fe sites. The first two pairs arise from irons of a similar oxidation state, while the last pair arises from irons in a different oxidation state, indicating a mixed-valent cluster. Variable field Mössbauer spectra for 2 were simulated assuming these two groups and a diamagnetic ground state. Taken together, the Mössbauer results and DFT calculations for 2 indicate two axial Fe(II) sites and four equatorial sites of lower valence, probably Fe(0). In the DFT optimized pentagonal bipyramidal structure for 2, the Fe(II)-Ccarbide distances are compressed (∼1.84 Å), while the Fe(0)-Ccarbide distances are elongated (∼2.05 Å). Analysis of the formulations for 1 (closo-square bipyramid) and 2 (nido-pentagonal bipyramid) is considered in the context of the textbook electron-counting rules of 14n+2 and 14n+4 for closo and nido clusters, respectively. This redox-dependent intracluster disproportionation of Fe oxidation states is concluded to arise from changes in bonding to the central carbide. A similar phenomenon may be promoted by the central carbide of the FeMoco cluster of nitrogenase, which may in turn stimulate N2 reduction.
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Affiliation(s)
- Subramaniam Kuppuswamy
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Joshua D Wofford
- Department of Chemistry, Texas A&M University , College Station, Texas 77840, United States
| | - Chris Joseph
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Zhu-Lin Xie
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Azim K Ali
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Vincent M Lynch
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Paul A Lindahl
- Department of Chemistry, Texas A&M University , College Station, Texas 77840, United States
| | - Michael J Rose
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States
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Imayoshi R, Nakajima K, Nishibayashi Y. Vanadium-catalyzed Reduction of Molecular Dinitrogen into Silylamine under Ambient Reaction Conditions. CHEM LETT 2017. [DOI: 10.1246/cl.161165] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Ryuji Imayoshi
- Department of Systems Innovation, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656
| | - Kazunari Nakajima
- Department of Systems Innovation, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656
| | - Yoshiaki Nishibayashi
- Department of Systems Innovation, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656
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119
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Ji X, Tong P, Yang D, Wang B, Zhao J, Li Y, Qu J. Synthesis, structural characterization and conversion of dinuclear iron-sulfur clusters containing the disulfide ligand: [Cp*Fe(μ-η 2:η 2-bdt)(cis-μ-η 1:η 1-S 2)FeCp*], [Cp*Fe(μ-S(C 6H 4S 2))(cis-μ-η 1:η 1-S 2)FeCp*], and [{Cp*Fe(bdt)} 2(trans-μ-η 1:η 1-S 2)]. Dalton Trans 2017; 46:3820-3824. [PMID: 28265627 DOI: 10.1039/c7dt00450h] [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 treatment of [Cp*Fe(μ-η2:η4-bdt)FeCp*] (1, Cp* = η5-C5Me5, bdt = benzene-1,2-dithiolate) with 1/4 equiv. of elemental sulfur (S8) gave a dinuclear iron-sulfur cluster [Cp*Fe(μ-η2:η2-bdt)(cis-μ-η1:η1-S2)FeCp*] (2), which contains a cis-1,2-disulfide ligand. When complex 2 further interacted with 1/8 equiv. of S8, another sulfur atom inserted into an Fe-S bond to give a rare product [Cp*Fe(μ-S(C6H4S2))(cis-μ-η1:η1-S2)FeCp*] (3). Unexpectedly, a trans-1,2 disulfide-bridged diiron complex [{Cp*Fe(bdt)}2(trans-μ-η1:η1-S2)] (4) was isolated from the reaction of complex 1 with 1/2 equiv. of S8, which represents a structural isomer of [2Fe-2S] ferredoxin-type clusters. In addition, cis-1,2-disulfide-bridged complex 3 can slowly convert into trans-1,2-disulfide-bridged complex 4 and the complex [Cp*Fe(μ-η2:η2-S2)(cis-μ-η1:η1-S2)FeCp*] (5) by self-assembly reaction at ambient temperature, which is evidenced by time-dependent 1H NMR spectroscopy.
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Affiliation(s)
- Xiaoxiao Ji
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, P.R. China.
| | - Peng Tong
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, P.R. China.
| | - Dawei Yang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, P.R. China.
| | - Baomin Wang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, P.R. China.
| | - Jinfeng Zhao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, P.R. China.
| | - Yang Li
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, P.R. China.
| | - Jingping Qu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, P.R. China. and Key Laboratory for Advanced Materials, East China University of Science and Technology, Shanghai, 200237, P.R. China
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120
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Yamagishi H, Konuma H, Kuwata S. Stereoselective synthesis of chlorido–phosphine ruthenium complexes bearing a pyrazole-based protic tripodal amine ligand. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.11.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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121
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Ouyang Z, Cheng J, Li L, Bao X, Deng L. High-Spin Iron(I) and Iron(0) Dinitrogen Complexes Supported by N-Heterocyclic Carbene Ligands. Chemistry 2016; 22:14162-5. [DOI: 10.1002/chem.201603390] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Zhenwu Ouyang
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 P. R. China
| | - Jun Cheng
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 P. R. China
| | - Lingling Li
- Instrumental Analysis Center; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 P. R. China
| | - Xiaoli Bao
- Instrumental Analysis Center; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 P. R. China
| | - Liang Deng
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 P. R. China
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122
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MacLeod KC, McWilliams SF, Mercado BQ, Holland PL. Stepwise N-H Bond Formation From N 2-Derived Iron Nitride, Imide and Amide Intermediates to Ammonia. Chem Sci 2016; 7:5736-5746. [PMID: 28066537 PMCID: PMC5207225 DOI: 10.1039/c6sc00423g] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Reduction of N2 to ammonia in nature and in electrocatalysis takes place through 1-proton/1-electron steps, motivating efforts to experimentally study the steps during proton/electron transfer to well-characterized N2-derived species with bridging nitrides. We report here the protonation and reduction reactions of an N2-derived iron bis(nitride) complex (Rodriguez et al., Science, 2011, 334, 780). We isolate and definitively characterize triiron imido and amido intermediates that lie along the path to ammonia formation, and Mössbauer spectroscopy shows the oxidation level of iron atoms in these mixed-valence clusters. The first two H atoms add to one of the two nitrides of the bis(nitride) complex, and the proton-coupled electron transfer in the second step can be concerted or stepwise depending on the sources of protons and electrons. The characterization of partially protonated nitrides and their mechanisms of formation are expected to guide efforts to convert N2 to ammonia with mild acids.
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Affiliation(s)
- K Cory MacLeod
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Sean F McWilliams
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Brandon Q Mercado
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Patrick L Holland
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
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