1
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Ferrer-Bru C, Ferrer J, Passarelli V, Lahoz FJ, García-Orduña P, Carmona D. Molecular Dihydrogen Activation by (C 5Me 5)M/N (M=Rh, Ir) Transition Metal Frustrated Lewis Pairs: Reversible Proton Migration to, and Proton Abstraction from, the C 5Me 5 Ligand. Chemistry 2024; 30:e202304140. [PMID: 38323731 DOI: 10.1002/chem.202304140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 02/07/2024] [Accepted: 02/07/2024] [Indexed: 02/08/2024]
Abstract
The masked transition-metal frustrated Lewis pairs [Cp*M(κ3N,N',N''-L)][SbF6] (Cp*=η5-C5Me5; M=Ir, 1, Rh, 2; HL=pyridinyl-amidine ligand) reversibly activate H2 under mild conditions rendering the hydrido derivatives [Cp*MH(κ2N,N'-HL)][SbF6] observed as a mixture of the E and Z isomers at the amidine C=N bond (M=Ir, 3Z, 3E; M=Rh, 4Z, 4E). DFT calculations indicate that the formation of the E isomers follows a Grotthuss type mechanism in the presence of water. A mixture of Rh(I) isomers of formula [(Cp*H)Rh(κ2N,N'-HL)][SbF6] (5 a-d) is obtained by reductive elimination of Cp*H from 4. The formation of 5 a-d was elucidated by means of DFT calculations. Finally, when 2 reacts with D2, the Cp* and Cp*H ligands of the resulting rhodium complexes 4 and 5, respectively, are deuterated as a result of a reversible hydrogen abstraction from the Cp* ligand and D2 activation at rhodium.
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Affiliation(s)
- Carlos Ferrer-Bru
- Departamento de Catálisis y Procesos Catalíticos, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, 50009, Zaragoza, Spain
| | - Joaquina Ferrer
- Departamento de Catálisis y Procesos Catalíticos, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, 50009, Zaragoza, Spain
| | - Vincenzo Passarelli
- Departamento de Catálisis y Procesos Catalíticos, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, 50009, Zaragoza, Spain
| | - Fernando J Lahoz
- Departamento de Catálisis y Procesos Catalíticos, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, 50009, Zaragoza, Spain
| | - Pilar García-Orduña
- Departamento de Catálisis y Procesos Catalíticos, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, 50009, Zaragoza, Spain
| | - Daniel Carmona
- Departamento de Catálisis y Procesos Catalíticos, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Departamento de Química Inorgánica, Pedro Cerbuna 12, 50009, Zaragoza, Spain
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2
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Athan M, Krishnan S, Loganathan N. trans-Di-bromido-tetra-kis-(5-methyl-1 H-pyrazole-κ N2)manganese(II). IUCRDATA 2024; 9:x240237. [PMID: 38586519 PMCID: PMC10993565 DOI: 10.1107/s2414314624002372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 03/12/2024] [Indexed: 04/09/2024] Open
Abstract
The title compound, trans-di-bromido-tetra-kis-(5-methyl-1H-pyrazole-κN 2)manganese(II), [MnBr2(C4H6N2)4] or [Mn(3-MePzH)4Br2] (1) crystallizes in the triclinic P space group with the cell parameters a = 7.6288 (3), b = 8.7530 (4), c = 9.3794 (4) Å and α = 90.707 (4), β = 106.138 (4), γ = 114.285 (5)°, V = 542.62 (5) Å3, T = 120 K. The asymmetric unit contains only half the mol-ecule with the manganese atom is situated on a crystallographic inversion center. The 3-MePzH ligands are present in an AABB type manner with two methyl groups pointing up and the other two down. The supra-molecular architecture is characterized by several inter-molecular C-H⋯N, N-H⋯Br, and C-H⋯π inter-actions. Earlier, a polymorphic structure of [Mn(3-MePzH)4Br2] (2) with a similar geometry and also an AABB arrangement for the pyrazole ligands was described [Reedijk et al. (1971 ▸). Inorg. Chem. 10, 2594-2599; a = 8.802 (6), b = 9.695 (5), c = 7.613 (8) Å and α = 105.12 (4), β = 114.98 (4), γ = 92.90 (3)°, V = 558.826 (5) Å3, T = 295 K]. A varying supra-molecular pattern was reported, with the structure of 1 featuring a herringbone type pattern while that of structure 2 shows a pillared network type of arrangement along the a axis. A nickel complex [Ni(3-MePzH)4Br2] isomorphic to 1 and the analogous chloro derivatives of FeII, CoII and CuII are also known.
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Affiliation(s)
- Manikumar Athan
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamilnadu, India
| | - Soundararajan Krishnan
- Department of Chemistry, Periyar Maniammai Institute of Science and Technology, Vallam-613403, Thanjavur, Tamil Nadu, India
| | - Nagarajan Loganathan
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamilnadu, India
- UGC-Faculty Recharge Programme, University Grant Commission, New Delhi,India
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3
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Hu H, Li Y, Li Y, Sun Y, Li Y. Carbamoyl Manganese Complexes for Epoxidation of Alkenes and Cycloaddition of Epoxides to Carbon Dioxide. J Catal 2023. [DOI: 10.1016/j.jcat.2023.02.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
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4
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Wang C, Lai Z, Huang G, Pan H. Current State of [Fe]‐Hydrogenase and Its Biomimetic Models. Chemistry 2022; 28:e202201499. [DOI: 10.1002/chem.202201499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Indexed: 11/11/2022]
Affiliation(s)
- Chao Wang
- Chemistry and Biomedicine Innovation Center (ChemBIC) State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University 163 Xianlin Avenue 210023 Nanjing P. R. China
| | - Zhenli Lai
- Key Laboratory of Development and Application of Rural Renewable Energy Biogas Institute of Ministry of Agriculture and Rural Affairs Section 4–13, Renmin South Road 610041 Chengdu P. R. China
| | - Gangfeng Huang
- Key Laboratory of Development and Application of Rural Renewable Energy Biogas Institute of Ministry of Agriculture and Rural Affairs Section 4–13, Renmin South Road 610041 Chengdu P. R. China
| | - Hui‐Jie Pan
- Chemistry and Biomedicine Innovation Center (ChemBIC) State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University 163 Xianlin Avenue 210023 Nanjing P. R. China
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5
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Fedulin A, Gupta SK, Rüter I, Meyer F, Jacobi von Wangelin A. Polynuclear Iron(II) Pyridonates: Synthesis and Reactivity of Fe 4 and Fe 5 Clusters. Inorg Chem 2022; 61:6149-6159. [PMID: 35404595 DOI: 10.1021/acs.inorgchem.2c00294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The combination of pyridonate ligands with transition metal ions enables the synthesis of an especially rich set of diverse coordination compounds involving various κ- and μ-bonding modes and higher nuclearities. With iron(II) ions, this chemical space is rather poorly explored beyond some biomimetic models of the pyridone iron-containing hydrogenase. Here, the topologically new Fe5 and Fe4 clusters, Fe5(LH)6[N(SiMe3)2]4 (1) and Fe4(LMe)6[N(SiMe3)2]2 (2), were synthesized (LH = 2-pyridonate; LMe = 6-methyl-2-pyridonate). Complex 1 contained an unprecedented diamondoid Fe@Fe4 tetrahedron with a central-to-peripheral Fe-Fe distance of ∼3.1 Å. The crystal structure of complex 2 displayed an Fe4O6 butterfly motif containing a planar Fe4 arrangement. Mössbauer spectroscopy confirmed the high-spin ferrous character of all iron ions. SQUID magnetometry reveals that the Fe(II) ions are involved in weak magnetic exchange coupling across the pyridonate bridges that results in antiferromagnetic interactions. The Fe4 cluster exhibits slow relaxation of magnetization under an applied magnetic field with an effective energy barrier of 38.5 K, rarely observed among the very rare examples of Fe(II) cluster-based single-molecule magnets. Studies of protolytic substitution of the amido ligands demonstrated the lability of the diamondoid Fe5 core in 1 and the stability of the Fe4 rhomboid in 2.
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Affiliation(s)
- Andrey Fedulin
- Department of Chemistry, University of Hamburg, Martin Luther King Pl 6, Hamburg 20146, Germany
| | - Sandeep K Gupta
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstr. 4, Göttingen 37077, Germany
| | - Isabelle Rüter
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstr. 4, Göttingen 37077, Germany
| | - Franc Meyer
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstr. 4, Göttingen 37077, Germany
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6
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Song LC, Zhang ZQ, Liu BB, Wang YP, Chen S. Biomimetic models of [Fe]-hydrogenase featuring a 2-acylphenylthiomethyl-6-R-pyridine (R = H or OMe) ligand. Chem Commun (Camb) 2022; 58:12168-12171. [DOI: 10.1039/d2cc04523k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new flexible pyridine ligand (FPL)-based method is developed, by which two novel biomimetic models of [Fe]-H2ase are prepared and their enzyme-like H2/D2 activation functions are studied.
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Affiliation(s)
- Li-Cheng Song
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China
| | - Zhen-Qing Zhang
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China
| | - Bei-Bei Liu
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China
| | - Yin-Peng Wang
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China
| | - Shuai Chen
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China
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7
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Kong KV, Wu YC, Liu YC, Tsai SW, Chu KT, Chen HJ, Wu CY, Hsu YY, Hsieh CC, Liu WJ, Chiang MH. Demethylation of Artificial Hydrogenase Agent for Prolonged CO Release and Enhanced Anti-Tau Aggregation Activity. Chem Commun (Camb) 2022; 58:7245-7248. [DOI: 10.1039/d2cc02119f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carbon Monoxide (CO) plays an important role in signaling in the cells, making its use as a therapeutic tool highly intriguing. Reduced burst emissions are important to avoid the cytotoxicity...
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8
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Kerns SA, Seo J, Lynch VM, Shearer J, Goralski ST, Sullivan ER, Rose MJ. Scaffold-based [Fe]-hydrogenase model: H 2 activation initiates Fe(0)-hydride extrusion and non-biomimetic hydride transfer. Chem Sci 2021; 12:12838-12846. [PMID: 34703571 PMCID: PMC8494020 DOI: 10.1039/d0sc03154b] [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: 06/05/2020] [Accepted: 09/01/2021] [Indexed: 11/21/2022] Open
Abstract
We report the synthesis and reactivity of a model of [Fe]-hydrogenase derived from an anthracene-based scaffold that includes the endogenous, organometallic acyl(methylene) donor. In comparison to other non-scaffolded acyl-containing complexes, the complex described herein retains molecularly well-defined chemistry upon addition of multiple equivalents of exogenous base. Clean deprotonation of the acyl(methylene) C–H bond with a phenolate base results in the formation of a dimeric motif that contains a new Fe–C(methine) bond resulting from coordination of the deprotonated methylene unit to an adjacent iron center. This effective second carbanion in the ligand framework was demonstrated to drive heterolytic H2 activation across the Fe(ii) center. However, this process results in reductive elimination and liberation of the ligand to extrude a lower-valent Fe–carbonyl complex. Through a series of isotopic labelling experiments, structural characterization (XRD, XAS), and spectroscopic characterization (IR, NMR, EXAFS), a mechanistic pathway is presented for H2/hydride-induced loss of the organometallic acyl unit (i.e. pyCH2–C
Created by potrace 1.16, written by Peter Selinger 2001-2019
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O → pyCH3+C
Created by potrace 1.16, written by Peter Selinger 2001-2019
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O). The known reduced hydride species [HFe(CO)4]− and [HFe3(CO)11]− have been observed as products by 1H/2H NMR and IR spectroscopies, as well as independent syntheses of PNP[HFe(CO)4]. The former species (i.e. [HFe(CO)4]−) is deduced to be the actual hydride transfer agent in the hydride transfer reaction (nominally catalyzed by the title compound) to a biomimetic substrate ([TolIm](BArF) = fluorinated imidazolium as hydride acceptor). This work provides mechanistic insight into the reasons for lack of functional biomimetic behavior (hydride transfer) in acyl(methylene)pyridine based mimics of [Fe]-hydrogenase. We report the synthesis and reactivity of a model of [Fe]-hydrogenase derived from an anthracene-based scaffold that includes the endogenous, organometallic acyl(methylene) donor.![]()
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Affiliation(s)
- Spencer A Kerns
- Department of Chemistry, The University of Texas at Austin Austin Texas 78712 USA
| | - Junhyeok Seo
- Department of Chemistry, Gwangju Institute of Science and Technology Gwangju 61005 Republic of Korea
| | - Vincent M Lynch
- Department of Chemistry, The University of Texas at Austin Austin Texas 78712 USA
| | - Jason Shearer
- Department of Chemistry, Trinity University One Trinity Place San Antonio Texas 78212 USA
| | - Sean T Goralski
- Department of Chemistry, The University of Texas at Austin Austin Texas 78712 USA
| | - Eileen R Sullivan
- Department of Chemistry, The University of Texas at Austin Austin Texas 78712 USA
| | - Michael J Rose
- Department of Chemistry, The University of Texas at Austin Austin Texas 78712 USA
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9
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Pan H, Huang G, Wodrich MD, Tirani FF, Ataka K, Shima S, Hu X. Diversifying Metal–Ligand Cooperative Catalysis in Semi‐Synthetic [Mn]‐Hydrogenases. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202100443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hui‐Jie Pan
- Laboratory of Inorganic Synthesis and Catalysis Institute of Chemical Sciences and Engineering Ecole Polytechnique Fédérale de Lausanne (EPFL) ISIC-LSCI, BCH 3305 1015 Lausanne Switzerland
| | - Gangfeng Huang
- Max Planck Institute for Terrestrial Microbiology Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | - Matthew D. Wodrich
- Laboratory of Inorganic Synthesis and Catalysis Institute of Chemical Sciences and Engineering Ecole Polytechnique Fédérale de Lausanne (EPFL) ISIC-LSCI, BCH 3305 1015 Lausanne Switzerland
- Laboratory for Computational Molecular Design Institute of Chemical Science and Engineering Ecole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Farzaneh Fadaei Tirani
- Laboratory of Inorganic Synthesis and Catalysis Institute of Chemical Sciences and Engineering Ecole Polytechnique Fédérale de Lausanne (EPFL) ISIC-LSCI, BCH 3305 1015 Lausanne Switzerland
| | - Kenichi Ataka
- Department of Physics Freie Universität Berlin Arnimallee 14 14195 Berlin Germany
| | - Seigo Shima
- Max Planck Institute for Terrestrial Microbiology Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | - Xile Hu
- Laboratory of Inorganic Synthesis and Catalysis Institute of Chemical Sciences and Engineering Ecole Polytechnique Fédérale de Lausanne (EPFL) ISIC-LSCI, BCH 3305 1015 Lausanne Switzerland
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10
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Pan H, Huang G, Wodrich MD, Tirani FF, Ataka K, Shima S, Hu X. Diversifying Metal-Ligand Cooperative Catalysis in Semi-Synthetic [Mn]-Hydrogenases. Angew Chem Int Ed Engl 2021; 60:13350-13357. [PMID: 33635597 PMCID: PMC8251902 DOI: 10.1002/anie.202100443] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 02/19/2021] [Indexed: 12/25/2022]
Abstract
The reconstitution of [Mn]-hydrogenases using a series of MnI complexes is described. These complexes are designed to have an internal base or pro-base that may participate in metal-ligand cooperative catalysis or have no internal base or pro-base. Only MnI complexes with an internal base or pro-base are active for H2 activation; only [Mn]-hydrogenases incorporating such complexes are active for hydrogenase reactions. These results confirm the essential role of metal-ligand cooperation for H2 activation by the MnI complexes alone and by [Mn]-hydrogenases. Owing to the nature and position of the internal base or pro-base, the mode of metal-ligand cooperation in two active [Mn]-hydrogenases is different from that of the native [Fe]-hydrogenase. One [Mn]-hydrogenase has the highest specific activity of semi-synthetic [Mn]- and [Fe]-hydrogenases. This work demonstrates reconstitution of active artificial hydrogenases using synthetic complexes differing greatly from the native active site.
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Affiliation(s)
- Hui‐Jie Pan
- Laboratory of Inorganic Synthesis and CatalysisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)ISIC-LSCI, BCH 33051015LausanneSwitzerland
| | - Gangfeng Huang
- Max Planck Institute for Terrestrial MicrobiologyKarl-von-Frisch-Straße 1035043MarburgGermany
| | - Matthew D. Wodrich
- Laboratory of Inorganic Synthesis and CatalysisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)ISIC-LSCI, BCH 33051015LausanneSwitzerland
- Laboratory for Computational Molecular DesignInstitute of Chemical Science and EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)1015LausanneSwitzerland
| | - Farzaneh Fadaei Tirani
- Laboratory of Inorganic Synthesis and CatalysisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)ISIC-LSCI, BCH 33051015LausanneSwitzerland
| | - Kenichi Ataka
- Department of PhysicsFreie Universität BerlinArnimallee 1414195BerlinGermany
| | - Seigo Shima
- Max Planck Institute for Terrestrial MicrobiologyKarl-von-Frisch-Straße 1035043MarburgGermany
| | - Xile Hu
- Laboratory of Inorganic Synthesis and CatalysisInstitute of Chemical Sciences and EngineeringEcole Polytechnique Fédérale de Lausanne (EPFL)ISIC-LSCI, BCH 33051015LausanneSwitzerland
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11
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Abstract
The role of deuterium in disentangling key steps of the mechanisms of H2 activation by mimics of hydrogenases is presented. These studies have allowed to a better understanding of the mode of action of the natural enzymes and their mimics.
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Affiliation(s)
- Mar Gómez-Gallego
- Departamento de Química Orgánica I and Center for Innovation in Advanced Chemistry (ORFEO-CINQA). Facultad de Química
- Universidad Complutense
- 28040-Madrid
- Spain
| | - Miguel A. Sierra
- Departamento de Química Orgánica I and Center for Innovation in Advanced Chemistry (ORFEO-CINQA). Facultad de Química
- Universidad Complutense
- 28040-Madrid
- Spain
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12
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Barik CK, Ganguly R, Kwan JM, Lam Z, Wong SY, Leong WK. Ruthenacyclic carbamoyl mimics of the [Fe]-hydrogenase active site: Derivatisation at the 4-position of the pyridinyl ring. Polyhedron 2021. [DOI: 10.1016/j.poly.2020.114890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Kaim V, Kaur-Ghumaan S. Mononuclear Mn complexes featuring N,S-/N,N-donor and 1,3,5-triaza-7-phosphaadamantane ligands: synthesis and electrocatalytic properties. NEW J CHEM 2021. [DOI: 10.1039/d1nj02104d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mononuclear Mn(i) carbonyl complexes incorporating 2-mercaptobenzothiazole or 2-mercaptobenzimidazole and phosphaadamantane ligands were evaluated as electrocatalysts for the HER both in acetonitrile and acetonitrile/water.
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Affiliation(s)
- Vishakha Kaim
- Department of Chemistry, University of Delhi, Delhi 110007, India
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14
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Guo Z, Jin J, Xiao Z, Chen N, Jiang X, Liu X, Wu L, He Y, Zhang S. Four iron(II) carbonyl complexes containing both pyridyl and halide ligands: Their synthesis, characterization, stability, and anticancer activity. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.6045] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Zhuming Guo
- College of Chemistry and Bioengineering Guilin University of Technology Guilin 541006 China
- College of Biological, Chemical Sciences and Engineering Jiaxing University Jiaxing 314001 China
| | - Jing Jin
- Department of Urology The Affiliated Hospital of Jiaxing University Jiaxing 314001 China
| | - Zhiyin Xiao
- College of Biological, Chemical Sciences and Engineering Jiaxing University Jiaxing 314001 China
| | - Naiwen Chen
- Department of Urology The Affiliated Hospital of Jiaxing University Jiaxing 314001 China
| | - Xiujuan Jiang
- College of Biological, Chemical Sciences and Engineering Jiaxing University Jiaxing 314001 China
| | - Xiaoming Liu
- College of Biological, Chemical Sciences and Engineering Jiaxing University Jiaxing 314001 China
| | - Lingfeng Wu
- Department of Urology The Affiliated Hospital of Jiaxing University Jiaxing 314001 China
| | - Yi He
- Department of Urology The Affiliated Hospital of Jiaxing University Jiaxing 314001 China
| | - Shuhua Zhang
- College of Chemistry and Bioengineering Guilin University of Technology Guilin 541006 China
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15
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Crystal Structures of [Fe]-Hydrogenase from Methanolacinia paynteri Suggest a Path of the FeGP-Cofactor Incorporation Process. INORGANICS 2020. [DOI: 10.3390/inorganics8090050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
[Fe]-hydrogenase (Hmd) catalyzes the reversible heterolytic cleavage of H2, and hydride transfer to methenyl-tetrahydromethanopterin (methenyl-H4MPT+). The iron-guanylylpyridinol (FeGP) cofactor, the prosthetic group of Hmd, can be extracted from the holoenzyme and inserted back into the protein. Here, we report the crystal structure of an asymmetric homodimer of Hmd from Methanolacinia paynteri (pHmd), which was composed of one monomer in the open conformation with the FeGP cofactor (holo-form) and a second monomer in the closed conformation without the cofactor (apo-form). In addition, we report the symmetric pHmd-homodimer structure in complex with guanosine monophosphate (GMP) or guanylylpyridinol (GP), in which each ligand was bound to the protein, where the GMP moiety of the FeGP-cofactor is bound in the holo-form. Binding of GMP and GP modified the local protein structure but did not induce the open conformation. The amino-group of the Lys150 appears to interact with the 2-hydroxy group of pyridinol ring in the pHmd–GP complex, which is not the case in the structure of the pHmd–FeGP complex. Lys150Ala mutation decreased the reconstitution rate of the active enzyme with the FeGP cofactor at the physiological pH. These results suggest that Lys150 might be involved in the FeGP-cofactor incorporation into the Hmd protein in vivo.
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16
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Barik CK, Chan XQ, Huynh HV, Li Y, Ganguly R, Leong WK. Ruthenium‐Based Structural Mimics of the Cofactor of [Fe]‐Hydrogenase: Replacement of the Acyl Moiety with an N‐Heterocyclic Carbene. ChemistrySelect 2020. [DOI: 10.1002/slct.202002889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Chandan Kr Barik
- Division of Chemistry & Biological Chemistry Nanyang Technological University 21 Nanyang Link Singapore
| | - Xian Qi Chan
- Division of Chemistry & Biological Chemistry Nanyang Technological University 21 Nanyang Link Singapore
| | - Han Vinh Huynh
- Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543
| | - Yongxin Li
- Division of Chemistry & Biological Chemistry Nanyang Technological University 21 Nanyang Link Singapore
| | - Rakesh Ganguly
- Division of Chemistry & Biological Chemistry Nanyang Technological University 21 Nanyang Link Singapore
- Shiv Nadar University NH-91 Tehsil Dadri Gautam Buddha Nagar Uttar Pradesh 201314 India
| | - Weng Kee Leong
- Division of Chemistry & Biological Chemistry Nanyang Technological University 21 Nanyang Link Singapore
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17
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Burlacot A, Burlacot F, Li-Beisson Y, Peltier G. Membrane Inlet Mass Spectrometry: A Powerful Tool for Algal Research. FRONTIERS IN PLANT SCIENCE 2020; 11:1302. [PMID: 33013952 PMCID: PMC7500362 DOI: 10.3389/fpls.2020.01302] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 08/11/2020] [Indexed: 05/15/2023]
Abstract
Since the first great oxygenation event, photosynthetic microorganisms have continuously shaped the Earth's atmosphere. Studying biological mechanisms involved in the interaction between microalgae and cyanobacteria with the Earth's atmosphere requires the monitoring of gas exchange. Membrane inlet mass spectrometry (MIMS) has been developed in the early 1960s to study gas exchange mechanisms of photosynthetic cells. It has since played an important role in investigating various cellular processes that involve gaseous compounds (O2, CO2, NO, or H2) and in characterizing enzymatic activities in vitro or in vivo. With the development of affordable mass spectrometers, MIMS is gaining wide popularity and is now used by an increasing number of laboratories. However, it still requires an important theory and practical considerations to be used. Here, we provide a practical guide describing the current technical basis of a MIMS setup and the general principles of data processing. We further review how MIMS can be used to study various aspects of algal research and discuss how MIMS will be useful in addressing future scientific challenges.
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Kerns SA, Rose MJ. Scaffold-Based Functional Models of [Fe]-Hydrogenase (Hmd): Building the Bridge between Biological Structure and Molecular Function. Acc Chem Res 2020; 53:1637-1647. [PMID: 32786339 DOI: 10.1021/acs.accounts.0c00315] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The well-known dinuclear [FeFe] and [NiFe] hydrogenase enzymes are redox-based proton reduction and H2 oxidation catalysts. In comparison, the structural and functional aspects of the mononuclear nonredox hydrogenase, known as [Fe]-hydrogenase or Hmd, have been less explored because of the relatively recent crystallographic elucidation of the enzyme active site. Additionally, the synthetic challenges posed by the highly substituted and asymmetric coordination environment of the iron guanylylpyridinol (FeGP) cofactor have hampered functional biomimetic modeling studies to a large extent. The active site contains an octahedral low-spin Fe(II) center with the following coordination motifs: a bidentate acyl-pyridone moiety (C,N) and cysteinyl-S in a facial arrangement; two cis carbonyl ligands; and a H2O/H2 binding site. In [Fe]-hydrogenase, heterolytic H2 activation putatively by the pendant pyridone/pyridonate-O base serving as a proton acceptor. Following H2 cleavage, an intermediate Fe-H species is thought to stereoselectively transfer a hydride to the substrate methenyl-H4MPT+, thus forming methylene-H4MPT. In the past decade, chemists, inspired by the elegant organometallic chemistry inherent to the FeGP cofactor, have synthesized a number of faithful structural models. However, functional systems are still relatively limited and often rely on abiological ligands or metal centers that obfuscate a direct correlation to nature's design.Our group has developed a bioinspired suite of synthetic analogues of Hmd to better understand the effects of structure on the stability and functionality of the Hmd active site, with a special emphasis on using a scaffold-based ligand design. This systematic approach has contributed to a deeper understanding of the unique ligand array of [Fe]-hydrogenase in nature and has ultimately resulted in the first functional synthetic models without the aid of abiological ligands. This Account reviews the reactivity of the functional anthracene-scaffolded synthetic models developed by our group in the context of current mechanistic understanding drawn from both protein crystallography and computational studies. Furthermore, we introduce a novel thermodynamic framework to place the reactivity of our model systems in context and provide an outlook on the future study of [Fe]-hydrogenase synthetic models through both a structural and functional lens.
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Affiliation(s)
- Spencer A. Kerns
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Michael J. Rose
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
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Song L, Liu B, Xu K. Synthetic and Structural Studies on a New Type of [Fe]‐Hydrogenase Mimics Each Containing One Hantzsch Ester Moiety. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000523] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Li‐Cheng Song
- Department of Chemistry State Key Laboratory of Elemento‐Organic Chemistry Nankai University 300071 Tianjin China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) 300072 Tianjin China
| | - Bei‐Bei Liu
- Department of Chemistry State Key Laboratory of Elemento‐Organic Chemistry Nankai University 300071 Tianjin China
| | - Kai‐Kai Xu
- Department of Chemistry State Key Laboratory of Elemento‐Organic Chemistry Nankai University 300071 Tianjin China
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Pan HJ, Hu X. Biomimetic Hydrogenation Catalyzed by a Manganese Model of [Fe]-Hydrogenase. Angew Chem Int Ed Engl 2020; 59:4942-4946. [PMID: 31820844 DOI: 10.1002/anie.201914377] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Indexed: 12/16/2022]
Abstract
[Fe]-hydrogenase is an efficient biological hydrogenation catalyst. Despite intense research, Fe complexes mimicking the active site of [Fe]-hydrogenase have not achieved turnovers in hydrogenation reactions. Herein, we describe the design and development of a manganese(I) mimic of [Fe]-hydrogenase. This complex exhibits the highest activity and broadest scope in catalytic hydrogenation among known mimics. Thanks to its biomimetic nature, the complex exhibits unique activity in the hydrogenation of compounds analogous to methenyl-H4 MPT+ , the natural substrate of [Fe]-hydrogenase. This activity enables asymmetric relay hydrogenation of benzoxazinones and benzoxazines, involving the hydrogenation of a chiral hydride transfer agent using our catalyst coupled to Lewis acid-catalyzed hydride transfer from this agent to the substrates.
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Affiliation(s)
- Hui-Jie Pan
- Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI, BCH 3305, Lausanne, 1015, Switzerland
| | - Xile Hu
- Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI, BCH 3305, Lausanne, 1015, Switzerland
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21
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Tang H, Brothers EN, Grapperhaus CA, Hall MB. Electrocatalytic Hydrogen Evolution and Oxidation with Rhenium Tris(thiolate) Complexes: A Competition between Rhenium and Sulfur for Electrons and Protons. ACS Catal 2020. [DOI: 10.1021/acscatal.9b04579] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Hao Tang
- Department of Chemistry, Texas A&M University, College Station, Texas 77845, United States
| | | | - Craig A. Grapperhaus
- Department of Chemistry, University of Louisville, 2320 South Brook Street, Louisville, Kentucky 40292, United States
| | - Michael B. Hall
- Department of Chemistry, Texas A&M University, College Station, Texas 77845, United States
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Methanogenesis involves direct hydride transfer from H2 to an organic substrate. Nat Rev Chem 2020; 4:213-221. [PMID: 37128042 DOI: 10.1038/s41570-020-0167-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/27/2020] [Indexed: 01/02/2023]
Abstract
Certain anaerobic microorganisms evolved a mechanism to use H2 as a reductant in their energy metabolisms. For these purposes, the microorganisms developed H2-activating enzymes, which are aspirational catalysts in a sustainable hydrogen economy. In the case of the hydrogenotrophic pathway performed by methanogenic archaea, 8e- are extracted from 4H2 and used as reducing equivalents to convert CO2 into CH4. Under standard cultivation conditions, these archaea express [NiFe]-hydrogenases, which are Ni-dependent and Fe-dependent enzymes and heterolytically cleave H2 into 2H+ and 2e-, the latter being supplied into the central metabolism. Under Ni-limiting conditions, F420-reducing [NiFe]-hydrogenases are downregulated and their functions are predominantly taken over by an upregulated [Fe]-hydrogenase. Unique in biology, this Fe-dependent hydrogenase cleaves H2 and directly transfers H- to an imidazolium-containing substrate. [Fe]-hydrogenase activates H2 at an Fe cofactor ligated by two CO molecules, an acyl group, a pyridinol N atom and a cysteine thiolate as the central constituent. This Fe centre has inspired chemists to not only design synthetic mimics to catalytically cleave H2 in solution but also for incorporation into apo-[Fe]-hydrogenase to give semi-synthetic proteins. This Perspective describes the enzymes involved in hydrogenotrophic methanogenesis, with a focus on those performing the reduction steps. Of these, we describe [Fe]-hydrogenases in detail and cover recent progress in their synthetic modelling.
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Xie ZL, Chai W, Kerns SA, Henkelman GA, Rose MJ. Bioinspired CNP Iron(II) Pincers Relevant to [Fe]-Hydrogenase (Hmd): Effect of Dicarbonyl versus Monocarbonyl Motifs in H 2 Activation and Transfer Hydrogenation. Inorg Chem 2020; 59:2548-2561. [DOI: 10.1021/acs.inorgchem.9b03476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhu-Lin Xie
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Wenrui Chai
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Spencer A. Kerns
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Graeme A. Henkelman
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Michael J. Rose
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
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Pan H, Hu X. Biomimetic Hydrogenation Catalyzed by a Manganese Model of [Fe]‐Hydrogenase. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914377] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Hui‐Jie Pan
- Laboratory of Inorganic Synthesis and CatalysisInstitute of Chemical Sciences and EngineeringÉcole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI BCH 3305 Lausanne 1015 Switzerland
| | - Xile Hu
- Laboratory of Inorganic Synthesis and CatalysisInstitute of Chemical Sciences and EngineeringÉcole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI BCH 3305 Lausanne 1015 Switzerland
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Song LC, Chen W, Zhu L, Hu FQ, Jiang KY. Synthesis, characterization, and some properties of two types of new [Fe]-H 2ase models containing a 4-phosphatopyridine or a 4-phosphatoguanosinepyridine moiety. NEW J CHEM 2020. [DOI: 10.1039/d0nj04194g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The novel [Fe]-H2ase active site framework-containing model 6 was first prepared and structurally characterized.
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Affiliation(s)
- Li-Cheng Song
- Department of Chemistry
- State Key Laboratory of Elemento-Organic Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Wei Chen
- Department of Chemistry
- State Key Laboratory of Elemento-Organic Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Liang Zhu
- Department of Chemistry
- State Key Laboratory of Elemento-Organic Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Fu-Qiang Hu
- Department of Chemistry
- State Key Laboratory of Elemento-Organic Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Kai-Yu Jiang
- Department of Chemistry
- State Key Laboratory of Elemento-Organic Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
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Song LC, Zhu L, Liu BB. A Biomimetic Model for the Active Site of [Fe]-H 2ase Featuring a 2-Methoxy-3,5-dimethyl-4-phosphato-6-acylmethylpyridine Ligand. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00635] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Li-Cheng Song
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, People’s Republic of China
| | - Liang Zhu
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Bei-Bei Liu
- Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
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Cho YI, Durgaprasad G, Rose MJ. CNS and CNP Iron(II) Mono-Iron Hydrogenase (Hmd) Mimics: Role of Deprotonated Methylene(acyl) and the trans-Acyl Site in H 2 Heterolysis. Inorg Chem 2019; 58:12689-12699. [PMID: 31497945 DOI: 10.1021/acs.inorgchem.9b01530] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report syntheses and H2 activation involving model complexes of mono-iron hydrogenase (Hmd) derived from acyl-containing pincer ligand precursors bearing thioether (CNSPre) or phosphine (CNPPre) donor sets. Both complexes feature pseudo-octahedral iron(II) dicarbonyl units. While the CNS pincer adopts the expected mer-CNS (pincer) geometry, the CNP ligand unexpectedly adopts the fac-CNP coordination geometry. Both complexes exhibit surprisingly acidic methylene C-H bond (reversibly de/protonated by a bulky phenolate), which affords a putative dearomatized pyridinate-bound intermediate. Such base treatment of Fe-CNS also results in deligation of the thioether sulfur donor, generating an open coordination site trans from the acyl unit. In contrast, Fe-CNP maintains a CO ligand trans from the acyl site both in the parent and dearomatized complexes (the -PPh2 donor is cis to acyl). The dearomatized mer-Fe-CNS was competent for H2 activation (5 atm D2(g) plus phenolate as base), which is attributed to both the basic site on the ligand framework and the open coordination site trans to the acyl donor. In contrast, the dearomatized fac-Fe-CNP was not competent for H2 activation, which is ascribed to the blocked coordination site trans from acyl (occupied by CO ligand). These results highlight the importance of both (i) the open coordination site trans to the organometallic acyl donor and (ii) a pendant base in the enzyme active site.
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Affiliation(s)
- Yae In Cho
- Department of Chemistry , The University of Texas at Austin , Austin , Texas 78712 , United States
| | - Gummadi Durgaprasad
- Department of Chemistry , The University of Texas at Austin , Austin , Texas 78712 , United States
| | - Michael J Rose
- Department of Chemistry , The University of Texas at Austin , Austin , Texas 78712 , United States
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Barik CK, Tessensohn ME, Webster RD, Leong WK. Group VIII carbamoyl complexes as catalysts for alkyne hydrocarboxylation and electrochemical proton reduction. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2019.03.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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29
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Pan HJ, Huang G, Wodrich MD, Tirani FF, Ataka K, Shima S, Hu X. A catalytically active [Mn]-hydrogenase incorporating a non-native metal cofactor. Nat Chem 2019; 11:669-675. [PMID: 31110253 PMCID: PMC6591119 DOI: 10.1038/s41557-019-0266-1] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Accepted: 03/28/2019] [Indexed: 11/22/2022]
Abstract
Nature carefully selects specific metal ions for incorporation into the enzymes that catalyze the chemical reactions necessary for life. Hydrogenases, enzymes that activate molecular H2, exclusively utilize Ni and Fe in [NiFe]-, [FeFe]-, and [Fe]-hydrogeanses. However, other transition metals are known to activate or catalyze the production of hydrogen in synthetic systems. Here, we report the development of a biomimetic model complex of [Fe]-hydrogenase that incorporates a Mn, as opposed to a Fe, metal center. This Mn complex is able to heterolytically cleave H2 as well as catalyze hydrogenation reactions. Incorporation of the model into an apoenzyme of [Fe]-hydrogenase results in a [Mn]-hydrogenase with enhanced occupancy-normalized activity over an analogous semi-synthetic [Fe]-hydrogenase. These findings represent the first instance of a non-native metal hydrogenase showing catalytic functionality and demonstrate that hydrogenases based on a manganese active site are viable.
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Affiliation(s)
- Hui-Jie Pan
- Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI, Lausanne, Switzerland
| | - Gangfeng Huang
- Max Planck Institute for Terrestrial Microbiology, Marburg, Germany
| | - Matthew D Wodrich
- Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI, Lausanne, Switzerland.,Laboratory for Computational Molecular Design, Institute of Chemical Science and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Farzaneh Fadaei Tirani
- Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI, Lausanne, Switzerland
| | - Kenichi Ataka
- Department of Physics, Freie Universität Berlin, Berlin, Germany
| | - Seigo Shima
- Max Planck Institute for Terrestrial Microbiology, Marburg, Germany.
| | - Xile Hu
- Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), ISIC-LSCI, Lausanne, Switzerland.
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30
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Barik CK, Ganguly R, Li Y, Leong WK. Very strong trans effect in ruthenacyclic carbamoyl complexes leads to ligand redistribution in phosphine derivatives. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2019.02.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Barik CK, Ganguly R, Li Y, Leong WK. Ruthenacyclic Carbamoyl Complexes: Highly Efficient Catalysts for Organosilane Hydrolysis. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201801012] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Chandan Kr Barik
- Division of Chemistry & Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Rakesh Ganguly
- Division of Chemistry & Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Yongxin Li
- Division of Chemistry & Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Weng Kee Leong
- Division of Chemistry & Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
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Pradeep T, Velusamy M, Mayilmurugan R. Novel iron(II)-N-heterocyclic carbene catalysts for efficient transfer hydrogenations under mild condition. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2018.08.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Zhang X, Zhang T, Li Y, Li B, Jiang S, Zhang G, Hai L, Ma X, Wu W, Wang J. Catalytic property of [FeFe]-hydrogenase model complex: [(μ-dmedt)Fe2(CO)5](μ-DPPF-O) (DPPF = 1,1′-bis(diphenylphosph ino)ferrocene) for the selective phenol hydroxylation. Catal Today 2018. [DOI: 10.1016/j.cattod.2018.01.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Barik CK, Ganguly R, Li Y, Przybylski C, Salmain M, Leong WK. Embedding a Ruthenium-Based Structural Mimic of the [Fe]-Hydrogenase Cofactor into Papain. Inorg Chem 2018; 57:12206-12212. [PMID: 30198260 DOI: 10.1021/acs.inorgchem.8b01835] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We describe the synthesis of the ruthenacyclic carbamoyl complexes [Ru(2-NHC(O)C5H3NMe)(CO)2( o,o-Me2-C6H3S)(L)] (L = H2O or MeCN), which have a labile water or acetonitrile ligand at their sixth coordination sites. Steric bulk around the ruthenium center is essential in preventing isomerization and dimerization, and embedding within papain can be achieved via coordination of its sole free cysteine residue. The observed chemistry parallels that of the natural [Fe]-hydrogenase.
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Affiliation(s)
- Chandan Kr Barik
- Division of Chemistry & Biological Chemistry , Nanyang Technological University , 21 Nanyang Link , Singapore 637371 , Singapore
| | - Rakesh Ganguly
- Division of Chemistry & Biological Chemistry , Nanyang Technological University , 21 Nanyang Link , Singapore 637371 , Singapore
| | - Yongxin Li
- Division of Chemistry & Biological Chemistry , Nanyang Technological University , 21 Nanyang Link , Singapore 637371 , Singapore
| | - Cédric Przybylski
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire (IPCM) , 4 place Jussieu , F-75005 Paris , France
| | - Michèle Salmain
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire (IPCM) , 4 place Jussieu , F-75005 Paris , France
| | - Weng Kee Leong
- Division of Chemistry & Biological Chemistry , Nanyang Technological University , 21 Nanyang Link , Singapore 637371 , Singapore
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Li JP, Luo SP, Zhan SZ, Shi YC. Synthesis, characterization and electrocatalytic H2 production of phosphine-substituted CpFe complexes. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.06.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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36
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Rong B, Zhong W, Gu E, Long L, Song L, Liu X. Probing the electron transfer mechanism of the half-sandwich iron(II)-carbonyl complexes and their catalysis on proton reduction. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.06.144] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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37
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Barik CK, Ganguly R, Li Y, Leong WK. Structural Mimics of the [Fe]-Hydrogenase: A Complete Set for Group VIII Metals. Inorg Chem 2018; 57:7113-7120. [PMID: 29799728 DOI: 10.1021/acs.inorgchem.8b00838] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A set of structural mimics of the [Fe]-hydrogenase active site comprising all the group VIII metals, viz., [M(2-NHC(O)C5H4N)(CO)2(2-S-C5H4N)], has been synthesized. They exist as a mixture of isomers in solution, and the relative stability of the isomers depends on the nature of the metal and the substituent at the 6-position of the pyridine ligand.
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Affiliation(s)
- Chandan Kr Barik
- Division of Chemistry & Biological Chemistry , Nanyang Technological University , 21 Nanyang Link , Singapore , 637371
| | - Rakesh Ganguly
- Division of Chemistry & Biological Chemistry , Nanyang Technological University , 21 Nanyang Link , Singapore , 637371
| | - Yongxin Li
- Division of Chemistry & Biological Chemistry , Nanyang Technological University , 21 Nanyang Link , Singapore , 637371
| | - Weng Kee Leong
- Division of Chemistry & Biological Chemistry , Nanyang Technological University , 21 Nanyang Link , Singapore , 637371
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Huang G, Wagner T, Ermler U, Bill E, Ataka K, Shima S. Dioxygen Sensitivity of [Fe]-Hydrogenase in the Presence of Reducing Substrates. Angew Chem Int Ed Engl 2018; 57:4917-4920. [PMID: 29462510 DOI: 10.1002/anie.201712293] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Indexed: 01/27/2023]
Abstract
Mono-iron hydrogenase ([Fe]-hydrogenase) reversibly catalyzes the transfer of a hydride ion from H2 to methenyltetrahydromethanopterin (methenyl-H4 MPT+ ) to form methylene-H4 MPT. Its iron guanylylpyridinol (FeGP) cofactor plays a key role in H2 activation. Evidence is presented for O2 sensitivity of [Fe]-hydrogenase under turnover conditions in the presence of reducing substrates, methylene-H4 MPT or methenyl-H4 MPT+ /H2 . Only then, H2 O2 is generated, which decomposes the FeGP cofactor; as demonstrated by spectroscopic analyses and the crystal structure of the deactivated enzyme. O2 reduction to H2 O2 requires a reductant, which can be a catalytic intermediate transiently formed during the [Fe]-hydrogenase reaction. The most probable candidate is an iron hydride species; its presence has already been predicted by theoretical studies of the catalytic reaction. The findings support predictions because the same type of reduction reaction is described for ruthenium hydride complexes that hydrogenate polar compounds.
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Affiliation(s)
- Gangfeng Huang
- Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
| | - Tristan Wagner
- Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
| | - Ulrich Ermler
- Max-Planck-Institut für Biophysik, Max-von-Laue-Straße 3, 60438, Frankfurt/Main, Germany
| | - Eckhard Bill
- Max-Planck-Institut für Chemische Energiekonversion, 45470, Mülheim, Germany
| | - Kenichi Ataka
- Department of Physics, Freie Universität Berlin, Berlin, 14195, Germany
| | - Seigo Shima
- Max-Planck-Institut für terrestrische Mikrobiologie, Karl-von-Frisch-Straße 10, 35043, Marburg, Germany
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Huang G, Wagner T, Ermler U, Bill E, Ataka K, Shima S. Dioxygen Sensitivity of [Fe]-Hydrogenase in the Presence of Reducing Substrates. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712293] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Gangfeng Huang
- Max-Planck-Institut für terrestrische Mikrobiologie; Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | - Tristan Wagner
- Max-Planck-Institut für terrestrische Mikrobiologie; Karl-von-Frisch-Straße 10 35043 Marburg Germany
| | - Ulrich Ermler
- Max-Planck-Institut für Biophysik; Max-von-Laue-Straße 3 60438 Frankfurt/Main Germany
| | - Eckhard Bill
- Max-Planck-Institut für Chemische Energiekonversion; 45470 Mülheim Germany
| | - Kenichi Ataka
- Department of Physics; Freie Universität Berlin; Berlin 14195 Germany
| | - Seigo Shima
- Max-Planck-Institut für terrestrische Mikrobiologie; Karl-von-Frisch-Straße 10 35043 Marburg Germany
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40
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Busch M, Wodrich MD, Corminboeuf C. Improving the Thermodynamic Profiles of Prospective Suzuki-Miyaura Cross-Coupling Catalysts by Altering the Electrophilic Coupling Component. ChemCatChem 2018. [DOI: 10.1002/cctc.201701710] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Michael Busch
- Laboratory for Computational Molecular Design; Institute of Chemical Sciences and Engineering; Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
- National Centre for Computational Design and Discovery of Novel Materials (MARVEL); Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
- Current Address: Department of Physics; Chalmers University of Technology; Fysikgränd 3 SE-412 96 Göteborg Sweden
| | - Matthew D. Wodrich
- Laboratory for Computational Molecular Design; Institute of Chemical Sciences and Engineering; Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
| | - Clémence Corminboeuf
- Laboratory for Computational Molecular Design; Institute of Chemical Sciences and Engineering; Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
- National Centre for Computational Design and Discovery of Novel Materials (MARVEL); Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
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41
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Fukuzumi S, Lee YM, Nam W. Thermal and photocatalytic production of hydrogen with earth-abundant metal complexes. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2017.07.014] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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43
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Tang H, Hall MB. Biomimetics of [NiFe]-Hydrogenase: Nickel- or Iron-Centered Proton Reduction Catalysis? J Am Chem Soc 2017; 139:18065-18070. [DOI: 10.1021/jacs.7b10425] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Hao Tang
- Department of Chemistry, Texas A&M University, College Station, Texas 77845, United States
| | - Michael B. Hall
- Department of Chemistry, Texas A&M University, College Station, Texas 77845, United States
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44
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Rigid scaffolds for the design of molecular catalysts and biomimetic active sites: A case study of anthracene-based ligands for modeling mono-iron hydrogenase (Hmd). Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.09.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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45
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Song LC, Zhu L, Hu FQ, Wang YX. Studies on Chemical Reactivity and Electrocatalysis of Two Acylmethyl(hydroxymethyl)pyridine Ligand-Containing [Fe]-Hydrogenase Models (2-COCH2-6-HOCH2C5H3N)Fe(CO)2L (L = η1-SCOMe, η1-2-SC5H4N). Inorg Chem 2017; 56:15216-15230. [DOI: 10.1021/acs.inorgchem.7b02582] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Li-Cheng Song
- Department
of Chemistry, State Key Laboratory of Elemento-Organic Chemistry,
College of Chemistry, and ‡Collaborative Innovation Center of Chemical Science
and Engineering (Tianjin), Nankai University, Tianjin 300071, China
| | - Liang Zhu
- Department
of Chemistry, State Key Laboratory of Elemento-Organic Chemistry,
College of Chemistry, and ‡Collaborative Innovation Center of Chemical Science
and Engineering (Tianjin), Nankai University, Tianjin 300071, China
| | - Fu-Qiang Hu
- Department
of Chemistry, State Key Laboratory of Elemento-Organic Chemistry,
College of Chemistry, and ‡Collaborative Innovation Center of Chemical Science
and Engineering (Tianjin), Nankai University, Tianjin 300071, China
| | - Yong-Xiang Wang
- Department
of Chemistry, State Key Laboratory of Elemento-Organic Chemistry,
College of Chemistry, and ‡Collaborative Innovation Center of Chemical Science
and Engineering (Tianjin), Nankai University, Tianjin 300071, China
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46
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Hai L, Zhang T, Zhang X, Zhang G, Li B, Jiang S, Ma X. Catalytic hydroxylation of phenol to dihydroxybenzene by Fe(II) complex in aqueous phase at ambient temperature. CATAL COMMUN 2017. [DOI: 10.1016/j.catcom.2017.08.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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47
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Shi J, Shang S, Hu B, Chen D. Ruthenium NNN complexes with a 2‐hydroxypyridylmethylene fragment for transfer hydrogenation of ketones. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.4100] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jing Shi
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageSchool of Chemistry and Chemical Engineering, Harbin Institute of Technology Harbin 150001 China
| | - Shu Shang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageSchool of Chemistry and Chemical Engineering, Harbin Institute of Technology Harbin 150001 China
| | - Bowen Hu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageSchool of Chemistry and Chemical Engineering, Harbin Institute of Technology Harbin 150001 China
| | - Dafa Chen
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageSchool of Chemistry and Chemical Engineering, Harbin Institute of Technology Harbin 150001 China
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48
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Bullock RM, Chambers GM. Frustration across the periodic table: heterolytic cleavage of dihydrogen by metal complexes. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2017; 375:20170002. [PMID: 28739961 PMCID: PMC5540836 DOI: 10.1098/rsta.2017.0002] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/12/2017] [Indexed: 06/07/2023]
Abstract
This perspective examines frustrated Lewis pairs (FLPs) in the context of heterolytic cleavage of H2 by transition metal complexes, with an emphasis on molecular complexes bearing an intramolecular Lewis base. FLPs have traditionally been associated with main group compounds, yet many reactions of transition metal complexes support a broader classification of FLPs that includes certain types of transition metal complexes with reactivity resembling main group-based FLPs. This article surveys transition metal complexes that heterolytically cleave H2, which vary in the degree that the Lewis pairs within these systems interact. Many of the examples include complexes bearing a pendant amine functioning as the base with the metal functioning as the hydride acceptor. Consideration of transition metal compounds in the context of FLPs can inspire new innovations and improvements in transition metal catalysis.This article is part of the themed issue 'Frustrated Lewis pair chemistry'.
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Affiliation(s)
- R Morris Bullock
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, PO Box 999, K2-12, Richland, WA 99352, USA
| | - Geoffrey M Chambers
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, PO Box 999, K2-12, Richland, WA 99352, USA
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Shi J, Hu B, Chen X, Shang S, Deng D, Sun Y, Shi W, Yang X, Chen D. Synthesis, Reactivity, and Catalytic Transfer Hydrogenation Activity of Ruthenium Complexes Bearing NNN Tridentate Ligands: Influence of the Secondary Coordination Sphere. ACS OMEGA 2017; 2:3406-3416. [PMID: 31457662 PMCID: PMC6641270 DOI: 10.1021/acsomega.7b00410] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 07/03/2017] [Indexed: 05/14/2023]
Abstract
By the introduction of -OH group(s) into different position(s) of 6-(pyridin-2-ylmethyl)-2,2'-bipyridine, several NNN-type ligands were synthesized and then introduced to ruthenium (Ru) centers by reactions with RuCl2(PPh3)3. In the presence of PPh3 or CO, these ruthenium complexes reacted with NH4PF6 in CH2Cl2 or CH3OH to give a series of ionic products 5-9. The reaction of Ru(L2)(PPh3)Cl2 (2) with CO generated a neutral complex [Ru(L2)(CO)Cl2] (10). In the presence of CH3ONa, 10 was further converted into complex [Ru(L2)(HOCH3)(CO)Cl] (11), in which there was a methanol molecule coordinating with ruthenium, as suggested by density functional theory calculations. The catalytic transfer hydrogenation activity of all of these new bifunctional metal-ligand complexes was tested. Dichloride complex 2 exhibits best activity, whereas carbonyl complexes 10 and 11 are efficient for selectively reducing 5-hexen-2-one, suggesting different hydrogenation mechanisms. The results reveal the dramatic influence for the reactivity and catalytic activity of the secondary coordination sphere in transition metal complexes.
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Affiliation(s)
- Jing Shi
- MIIT
Key Laboratory of Critical Materials Technology for New Energy Conversion
and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Bowen Hu
- MIIT
Key Laboratory of Critical Materials Technology for New Energy Conversion
and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Xiangyang Chen
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, Institute of Chemistry Chinese Academy of Sciences, Beijing 100190, China
- Institute
of Chemistry, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Shu Shang
- MIIT
Key Laboratory of Critical Materials Technology for New Energy Conversion
and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Danfeng Deng
- MIIT
Key Laboratory of Critical Materials Technology for New Energy Conversion
and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Yanan Sun
- MIIT
Key Laboratory of Critical Materials Technology for New Energy Conversion
and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Weiwei Shi
- MIIT
Key Laboratory of Critical Materials Technology for New Energy Conversion
and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Xinzheng Yang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, Institute of Chemistry Chinese Academy of Sciences, Beijing 100190, China
| | - Dafa Chen
- MIIT
Key Laboratory of Critical Materials Technology for New Energy Conversion
and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
- State
Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
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50
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Hatazawa M, Yoshie N, Seino H. Reversible Hydride Transfer to N,N'-Diarylimidazolinium Cations from Hydrogen Catalyzed by Transition Metal Complexes Mimicking the Reaction of [Fe]-Hydrogenase. Inorg Chem 2017; 56:8087-8099. [PMID: 28654277 DOI: 10.1021/acs.inorgchem.7b00806] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[Fe]-hydrogenase is a key enzyme involved in methanogenesis and facilitates reversible hydride transfer from H2 to N5,N10-methenyltetrahydromethanopterin (CH-H4MPT+). In this study, a reaction system was developed to model the enzymatic function of [Fe]-hydrogenase by using N,N'-diphenylimidazolinium cation (1+) as a structurally related alternative to CH-H4MPT+. In connection with the enzymatic mechanism via heterolytic cleavage of H2 at the single metal active site, several transition metal complex catalysts capable of such activation were utilized in the model system. Reduction of 1[BF4] to N,N'-diphenylimidazolidine (2) was achieved under 1 atm H2 at ambient temperature in the presence of an equimolar amount of NEt3 as a proton acceptor. The proposed catalytic pathways involved the generation of active hydride complexes and subsequent intermolecular hydride transfer to 1+. The reverse reaction was accomplished by treatment of 2 with HNMe2Ph+ as the proton source, where [(η5-C5Me5)Ir{(p-MeC6H4SO2)NCHPhCHPhNH}] was found to catalyze the formation of 1+ and H2 with high efficiency. These results are consistent with the fact that use of 2,6-lutidine in the forward reaction or 2,6-lutidinium in the reverse reaction resulted in incomplete conversion. By combining these reactions using the above Ir amido catalyst, the reversible hydride transfer interconverting 1+/H2 and 2/H+ was performed successfully. This system demonstrated the hydride-accepting and hydride-donating modes of biologically relevant N-heterocycles coupled with proton concentration. The influence of substituents on the forward and reverse reactivities was examined for the derivatives of 1+ and 2 bearing one para-substituted N-phenyl group.
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Affiliation(s)
- Masahiro Hatazawa
- Institute of Industrial Science, The University of Tokyo , Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Naoko Yoshie
- Institute of Industrial Science, The University of Tokyo , Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Hidetake Seino
- Faculty of Education and Human Studies, Akita University , Tegata-Gakuenmachi, Akita 010-8502, Japan
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