1
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Börner M, Fuhrmann D, Klose J, Krautscheid H, Kersting B. Ethereal Hydroperoxides: Powerful Reagents for S-Oxygenation of Bridging Thiophenolate Functions. Inorg Chem 2021; 60:13517-13527. [PMID: 34415154 DOI: 10.1021/acs.inorgchem.1c01854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
S-Oxygenation of thiophenolate bridges by ethereal hydroperoxides was studied. [NiII2LS(PhCO2)]+ (1), where LS = macrocyclic aminethiolate supporting ligand, is S-oxygenated readily in a mixed methanol/acetonitrile solution with ether/dioxygen at room temperature in the presence of daylight. The reactions were found to depend strongly on the choice of the ether. Uptake of two O atoms occurs in dioxane to give a mixed thiolate/sulfinate complex [NiII2LSO2(PhCO2)]+ (2) containing the rare five-membered Ni(μ1,1-S)(μ1,2-OS)Ni core. In tetrahydrofuran, four O atoms are taken up by 1 to generate the bis(sulfinate) species [NiII2LSO4(PhCO2)]+ (3). A mono-S-oxygenated sulfenate intermediate can be detected by electrospray ionization mass spectrometry. The oxygenation reactions proceed in high yields without complex disintegration and invariably provide μ1,2-bridging sulfinates as established by spectroscopy (IR and UV/vis), X-ray crystallography, and accompanying density functional theory calculations. The oxygenation of the S atoms has a strong impact on the electronic structures of the nickel complexes. The monosulfinate complex 2 has an S = 2 ground state resulting from moderate ferromagnetic exchange coupling interactions (J = +15.7 cm-1; H = -2JS1S2), while an antiferromagnetic exchange interaction in 3 shows the presence of a ground state with spin S = 0 (J = -0.56 cm-1).
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Affiliation(s)
- Martin Börner
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany.,Leibniz-Institut für Oberflächenmodifizierung, Abteilung Funktionale Oberflächen, Permoserstrasse 15, D-04318 Leipzig, Germany
| | - Daniel Fuhrmann
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Jennifer Klose
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Harald Krautscheid
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Berthold Kersting
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
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2
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Kleinhaus JT, Wittkamp F, Yadav S, Siegmund D, Apfel UP. [FeFe]-Hydrogenases: maturation and reactivity of enzymatic systems and overview of biomimetic models. Chem Soc Rev 2021; 50:1668-1784. [DOI: 10.1039/d0cs01089h] [Citation(s) in RCA: 71] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
[FeFe]-hydrogenases recieved increasing interest in the last decades. This review summarises important findings regarding their enzymatic reactivity as well as inorganic models applied as electro- and photochemical catalysts.
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Affiliation(s)
| | | | - Shanika Yadav
- Inorganic Chemistry I
- Ruhr University Bochum
- 44801 Bochum
- Germany
| | - Daniel Siegmund
- Department of Electrosynthesis
- Fraunhofer UMSICHT
- 46047 Oberhausen
- Germany
| | - Ulf-Peter Apfel
- Inorganic Chemistry I
- Ruhr University Bochum
- 44801 Bochum
- Germany
- Department of Electrosynthesis
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3
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Abstract
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The
energetics for proton reduction in FeFe-hydrogenase has been
reinvestigated by theoretical modeling, in light of recent experiments.
Two different mechanisms have been considered. In the first one, the
bridging hydride position was blocked by the enzyme, which is the
mechanism that has been supported by a recent spectroscopic study
by Cramer et al. A major difficulty in
the present study to agree with experimental energetics was to find
the right position for the added proton in the first reduction step.
It was eventually found that the best position was as a terminal hydride
on the distal iron, which has not been suggested in any of the recent,
experimentally based mechanisms. The lowest transition state was surprisingly
found to be a bond formation between a proton on a cysteine and the
terminal hydride. This type of TS is similar to the one for heterolytic
H2 cleavage in NiFe hydrogenase. The second mechanism investigated
here is not supported by the present calculations or the recent experiments
by Cramer et al., but was still studied as an interesting comparison.
In that mechanism, the formation of the bridging hydride was allowed.
The H–H formation barrier is only 3.6 kcal/mol higher than
for the first mechanism, but there are severe problems concerning
the motion of the protons.
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Affiliation(s)
- Per E M Siegbahn
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Rong-Zhen Liao
- Key Laboratory for Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Bioinorganic Chemistry and Materia Media, Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China
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4
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Yang X, Darensbourg MY. The roles of chalcogenides in O 2 protection of H 2ase active sites. Chem Sci 2020; 11:9366-9377. [PMID: 34094202 PMCID: PMC8161538 DOI: 10.1039/d0sc02584d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 08/11/2020] [Indexed: 12/31/2022] Open
Abstract
At some point, all HER (Hydrogen Evolution Reaction) catalysts, important in sustainable H2O splitting technology, will encounter O2 and O2-damage. The [NiFeSe]-H2ases and some of the [NiFeS]-H2ases, biocatalysts for reversible H2 production from protons and electrons, are exemplars of oxygen tolerant HER catalysts in nature. In the hydrogenase active sites oxygen damage may be extensive (irreversible) as it is for the [FeFe]-H2ase or moderate (reversible) for the [NiFe]-H2ases. The affinity of oxygen for sulfur, in [NiFeS]-H2ase, and selenium, in [NiFeSe]-H2ase, yielding oxygenated chalcogens results in maintenance of the core NiFe unit, and myriad observable but inactive states, which can be reductively repaired. In contrast, the [FeFe]-H2ase active site has less possibilities for chalcogen-oxygen uptake and a greater chance for O2-attack on iron. Exposure to O2 typically leads to irreversible damage. Despite the evidence of S/Se-oxygenation in the active sites of hydrogenases, there are limited reported synthetic models. This perspective will give an overview of the studies of O2 reactions with the hydrogenases and biomimetics with focus on our recent studies that compare sulfur and selenium containing synthetic analogues of the [NiFe]-H2ase active sites.
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Affiliation(s)
- Xuemei Yang
- Texas A&M University, Department of Chemistry College Station TX 77843 USA
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5
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Kariyawasam Pathirana KD, Ghosh P, Hsieh CH, Elrod LC, Bhuvanesh N, Darensbourg DJ, Darensbourg MY. Synthetic Metallodithiolato Ligands as Pendant Bases in [Fe IFe I], [Fe I[Fe(NO)] II], and [(μ-H)Fe IIFe II] Complexes. Inorg Chem 2020; 59:3753-3763. [PMID: 32083850 DOI: 10.1021/acs.inorgchem.9b03409] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The development of ligands with specific stereo- and electrochemical requirements that are necessary for catalyst design challenges synthetic chemists in academia and industry. The crucial aza-dithiolate linker in the active site of [FeFe]-H2ase has inspired the development of synthetic analogues that utilize ligands which serve as conventional σ donors with pendant base features for H+ binding and delivery. Several MN2S2 complexes (M = Ni2+, [Fe(NO)]2+, [Co(NO)]2+, etc.) utilize these cis-dithiolates to bind low valent metals and also demonstrate the useful property of hemilability, i.e., alternate between bi- and monodentate ligation. Herein, synthetic efforts have led to the isolation and characterization of three heterotrimetallics that employ metallodithiolato ligand binding to di-iron scaffolds in three redox levels, (μ-pdt)[Fe(CO)3]2, (μ-pdt)[Fe(CO)3][(Fe(NO))II(IMe)(CO)]+, and (μ-pdt)(μ-H)[FeII(CO)2(PMe3)]2+ to generate (μ-pdt)[(FeI(CO)3][FeI(CO)2·NiN2S2] (1), (μ-pdt)[FeI(CO)3][(Fe(NO))II(IMe)(CO)]+ (2), and (μ-pdt)(μ-H)[FeII(CO)2(PMe3)][FeII(CO)(PMe3)·NiN2S2]+ (3) complexes (pdt = 1,3-propanedithiolate, IMe = 1,3-dimethylimidazole-2-ylidene, NiN2S2 = [N,N'-bis(2-mercaptidoethyl)-1,4-diazacycloheptane] nickel(II)). These complexes display efficient metallodithiolato binding to the di-iron scaffold with one thiolate-S, which allows the free unbound thiolate to potentially serve as a built-in pendant base to direct proton binding, promoting a possible Fe-H-···+H-S coupling mechanism for the electrocatalytic hydrogen evolution reaction (HER) in the presence of acids. Ligand substitution studies on 1 indicate an associative/dissociative type reaction mechanism for the replacement of the NiN2S2 ligand, providing insight into the Fe-S bond strength.
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Affiliation(s)
| | - Pokhraj Ghosh
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Chung-H Hsieh
- Department of Chemistry, Tamkang University, New Taipei City, Taiwan
| | - Lindy Chase Elrod
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Donald J Darensbourg
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Marcetta Y Darensbourg
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
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6
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Wang VCC, Esmieu C, Redman HJ, Berggren G, Hammarström L. The reactivity of molecular oxygen and reactive oxygen species with [FeFe] hydrogenase biomimetics: reversibility and the role of the second coordination sphere. Dalton Trans 2020; 49:858-865. [DOI: 10.1039/c9dt04618f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new one-electron reduced and oxygenated species from H2-evolving complexes, inspired by [FeFe] hydrogenase, was prepared by directly reacting with O2 and chemical reductants. Its structure and reactivity were investigated by spectroscopic tools.
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Affiliation(s)
- Vincent C.-C. Wang
- Program of Physical Chemistry
- Department of Chemistry – Ångström Laboratory
- Uppsala University
- Uppsala 75120
- Sweden
| | - Charlène Esmieu
- Program of Molecular Biomimetics
- Department of Chemistry – Ångström Laboratory
- Uppsala University
- Uppsala 75120
- Sweden
| | - Holly J. Redman
- Program of Molecular Biomimetics
- Department of Chemistry – Ångström Laboratory
- Uppsala University
- Uppsala 75120
- Sweden
| | - Gustav Berggren
- Program of Molecular Biomimetics
- Department of Chemistry – Ångström Laboratory
- Uppsala University
- Uppsala 75120
- Sweden
| | - Leif Hammarström
- Program of Physical Chemistry
- Department of Chemistry – Ångström Laboratory
- Uppsala University
- Uppsala 75120
- Sweden
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7
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Computational study of [(phenanthroline)2FeII/III–(terephthalate)–CoIII/II(phenanthroline)2]3+ binuclear complex. Struct Chem 2019. [DOI: 10.1007/s11224-019-01442-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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8
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Esselborn J, Kertess L, Apfel UP, Hofmann E, Happe T. Loss of Specific Active-Site Iron Atoms in Oxygen-Exposed [FeFe]-Hydrogenase Determined by Detailed X-ray Structure Analyses. J Am Chem Soc 2019; 141:17721-17728. [PMID: 31609603 DOI: 10.1021/jacs.9b07808] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The [FeFe]-hydrogenases catalyze the uptake and evolution of hydrogen with unmatched speed at low overpotential. However, oxygen induces the degradation of the unique [6Fe-6S] cofactor within the active site, termed the H-cluster. We used X-ray structural analyses to determine possible modes of irreversible oxygen-driven inactivation. To this end, we exposed crystals of the [FeFe]-hydrogenase CpI from Clostridium pasteurianum to oxygen and quantitatively investigated the effects on the H-cluster structure over several time points using multiple data sets, while correlating it to decreases in enzyme activity. Our results reveal the loss of specific Fe atoms from both the diiron (2FeH) and the [4Fe-4S] subcluster (4FeH) of the H-cluster. Within the 2FeH, the Fe atom more distal to the 4FeH is strikingly more affected than the more proximal Fe atom. The 4FeH interconverts to a [2Fe-2S] cluster in parts of the population of active CpIADT, but not in crystals of the inactive apoCpI initially lacking the 2FeH. We thus propose two parallel processes: dissociation of the distal Fe atom and 4FeH interconversion. Both pathways appear to play major roles in the oxidative damage of [FeFe]-hydrogenases under electron-donor deprived conditions probed by our experimental setup.
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9
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Ghosh S, Rahaman A, Orton G, Gregori G, Bernat M, Kulsume U, Hollingsworth N, Holt KB, Kabir SE, Hogarth G. Synthesis, Molecular Structures and Electrochemical Investigations of [FeFe]‐Hydrogenase Biomimics [Fe
2
(CO)
6‐
n
(EPh
3
)
n
(µ‐edt)] (E = P, As, Sb;
n
= 1, 2). Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900891] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Shishir Ghosh
- Department of Chemistry University College London 20 Gordon Street WC1H 0AJ London UK
- Department of Chemistry Jahangirnagar University Dhaka 1342 Savar Bangladesh
- Department of Chemistry King's College London Britannia House 7 Trinity Street SE1 1DB London UK
| | - Ahibur Rahaman
- Department of Chemistry Jahangirnagar University Dhaka 1342 Savar Bangladesh
| | - Georgia Orton
- Department of Chemistry King's College London Britannia House 7 Trinity Street SE1 1DB London UK
| | - Gregory Gregori
- Department of Chemistry University College London 20 Gordon Street WC1H 0AJ London UK
| | - Martin Bernat
- Department of Chemistry University College London 20 Gordon Street WC1H 0AJ London UK
| | - Ummey Kulsume
- Department of Chemistry Jahangirnagar University Dhaka 1342 Savar Bangladesh
| | - Nathan Hollingsworth
- Department of Chemistry University College London 20 Gordon Street WC1H 0AJ London UK
| | - Katherine B. Holt
- Department of Chemistry University College London 20 Gordon Street WC1H 0AJ London UK
| | - Shariff E. Kabir
- Department of Chemistry Jahangirnagar University Dhaka 1342 Savar Bangladesh
| | - Graeme Hogarth
- Department of Chemistry King's College London Britannia House 7 Trinity Street SE1 1DB London UK
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10
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Khrizanforova V, Morozov V, Khrizanforov M, Lukoyanov A, Kataeva O, Fedushkin I, Budnikova Y. Iron complexes of BIANs: Redox trends and electrocatalysis of hydrogen evolution. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.07.041] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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11
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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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12
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Synthesis, characterisation and protonation of phosphate disubstituted derivatives with pyridyl-functionalized diiron. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.11.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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13
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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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14
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Yu X, Tung CH, Wang W, Huynh MT, Gray DL, Hammes-Schiffer S, Rauchfuss TB. Interplay between Terminal and Bridging Diiron Hydrides in Neutral and Oxidized States. Organometallics 2017; 36:2245-2253. [PMID: 28781408 DOI: 10.1021/acs.organomet.7b00297] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
This study describes the structural, spectroscopic, and electrochemical properties of electronically unsymmetrical diiron hydrides. The terminal hydride Cp*Fe(pdt)Fe(dppe)(CO)H ([1(t-H)]0, Cp*- = Me5C5-, pdt2- = CH2(CH2S-)2, dppe = Ph2PC2H4PPh2) was prepared by hydride reduction of [Cp*Fe(pdt)Fe(dppe)(CO)(NCMe)]+. As established by X-ray crystallography, [1(t-H)]0 features a terminal hydride ligand. Unlike previous examples of terminal diiron hydrides, [1(t-H)]0 does not isomerize to the bridging hydride [1(μ-H)]0. Oxidation of [1(t-H)]0 gives [1(t-H)]+, which was also characterized crystallographically as its BF4- salt. Density functional theory (DFT) calculations indicate that [1(t-H)]+ is best described as containing an Cp*FeIII center. In solution, [1(t-H)]+ isomerizes to [1(μ-H)]+, as anticipated by DFT. Reduction of [1(μ-H)]+ by Cp2Co afforded the diferrous bridging hydride [1(μ-H)]0. Electrochemical measurements and DFT calculations indicate that the couples [1(t-H)]+/0 and [1(μ-H)]+/0 differ by 210 mV. Qualitative measurements indicate that [1(t-H)]0 and [1(μ-H)]0 are close in free energy. Protonation of [1(t-H)]0 in MeCN solution affords H2 even with weak acids via hydride transfer. In contrast, protonation of [1(μ-H)]0 yields 0.5 equiv of H2 by a proposed protonation-induced electron transfer process. Isotopic labeling indicates that μ-H/D ligands are inert.
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Affiliation(s)
- Xin Yu
- School of Chemistry and Chemical Engineering, Shandong University, 27 South Shanda Road, Jinan, Shandong 250100, People's Republic of China
| | - Chen-Ho Tung
- School of Chemistry and Chemical Engineering, Shandong University, 27 South Shanda Road, Jinan, Shandong 250100, People's Republic of China
| | - Wenguang Wang
- School of Chemistry and Chemical Engineering, Shandong University, 27 South Shanda Road, Jinan, Shandong 250100, People's Republic of China
| | - Mioy T Huynh
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Goodwin Avenue, Urbana, Illinois 61801, United States
| | - Danielle L Gray
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Goodwin Avenue, Urbana, Illinois 61801, United States
| | - Sharon Hammes-Schiffer
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Goodwin Avenue, Urbana, Illinois 61801, United States
| | - Thomas B Rauchfuss
- School of Chemical Sciences, University of Illinois at Urbana-Champaign, 600 South Goodwin Avenue, Urbana, Illinois 61801, United States
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15
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Zhang X, Zhang T, Li B, Zhang G, Hai L, Ma X, Wu W, Jiang S. Effect of the Terminal Ligands of [FeFe]-Hydrogenase Model Complexes on Proton Reduction Properties and Catalytic Hydroxylation of Benzene. ChemistrySelect 2017. [DOI: 10.1002/slct.201700394] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Xia Zhang
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300354 China
- Tianjin Engineering Research Center of Functional Fine Chemicals; Tianjin 300354 China
| | - Tianyong Zhang
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300354 China
- Tianjin Engineering Research Center of Functional Fine Chemicals; Tianjin 300354 China
| | - Bin Li
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300354 China
- Tianjin Engineering Research Center of Functional Fine Chemicals; Tianjin 300354 China
| | - Guanghui Zhang
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
| | - Li Hai
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
| | - Xiaoyuan Ma
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
| | - Wubin Wu
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
| | - Shuang Jiang
- Tianjin Key Laboratory of Applied Catalysis Science and Technology; School of Chemical Engineering and Technology; Tianjin University; Tianjin 300354 China
- Collaborative Innovation Center of Chemical Science and Engineering; Tianjin 300354 China
- Tianjin Engineering Research Center of Functional Fine Chemicals; Tianjin 300354 China
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16
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Zhang F, Zhang J, Zhou X. Facile Construction of Yttrium Pentasulfides from Yttrium Alkyl Precursors: Synthesis, Mechanism, and Reactivity. Inorg Chem 2017; 56:2070-2077. [DOI: 10.1021/acs.inorgchem.6b02747] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fangjun Zhang
- Department of Chemistry, Fudan University, Shanghai 200433, People’s Republic of China
| | - Jie Zhang
- Department of Chemistry, Fudan University, Shanghai 200433, People’s Republic of China
| | - Xigeng Zhou
- Department of Chemistry, Fudan University, Shanghai 200433, People’s Republic of China
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17
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Lindenmaier NJ, Wahlefeld S, Bill E, Szilvási T, Eberle C, Yao S, Hildebrandt P, Horch M, Zebger I, Driess M. An S-Oxygenated [NiFe] Complex Modelling Sulfenate Intermediates of an O2
-Tolerant Hydrogenase. Angew Chem Int Ed Engl 2017; 56:2208-2211. [DOI: 10.1002/anie.201611069] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Nils J. Lindenmaier
- Institut für Chemie: Metallorganik und Anorganische Materialien, Sekr. C2; Technische Universität Berlin; Strasse des 17. Juni 135 10623 Berlin Germany
| | - Stefan Wahlefeld
- Institut für Chemie: Physikalische Chemie/Biophysikalische Chemie, Sekr. PC14; Technische Universität Berlin; Strasse des 17. Juni 135 10623 Berlin Germany
| | - Eckhard Bill
- Abteilung Molekulare Theorie und Spektroskopie; Max-Planck-Institut für Chemische Energiekonversion; Mülheim a. d. Ruhr Germany
| | - Tibor Szilvási
- Department of Chemical and Biological Engineering; University of Wisconsin, Madison; USA
| | - Christopher Eberle
- Institut für Chemie: Metallorganik und Anorganische Materialien, Sekr. C2; Technische Universität Berlin; Strasse des 17. Juni 135 10623 Berlin Germany
| | - Shenglai Yao
- Institut für Chemie: Metallorganik und Anorganische Materialien, Sekr. C2; Technische Universität Berlin; Strasse des 17. Juni 135 10623 Berlin Germany
| | - Peter Hildebrandt
- Institut für Chemie: Physikalische Chemie/Biophysikalische Chemie, Sekr. PC14; Technische Universität Berlin; Strasse des 17. Juni 135 10623 Berlin Germany
| | - Marius Horch
- Institut für Chemie: Physikalische Chemie/Biophysikalische Chemie, Sekr. PC14; Technische Universität Berlin; Strasse des 17. Juni 135 10623 Berlin Germany
| | - Ingo Zebger
- Institut für Chemie: Physikalische Chemie/Biophysikalische Chemie, Sekr. PC14; Technische Universität Berlin; Strasse des 17. Juni 135 10623 Berlin Germany
| | - Matthias Driess
- Institut für Chemie: Metallorganik und Anorganische Materialien, Sekr. C2; Technische Universität Berlin; Strasse des 17. Juni 135 10623 Berlin Germany
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18
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Lindenmaier NJ, Wahlefeld S, Bill E, Szilvási T, Eberle C, Yao S, Hildebrandt P, Horch M, Zebger I, Driess M. Ein S-oxygenierter [NiFe]-Komplex als Modell für Sulfenat- intermediate einer O 2
-toleranten Hydrogenase. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Nils J. Lindenmaier
- Institut für Chemie: Metallorganik und Anorganische Materialien, Sekr. C2; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Deutschland
| | - Stefan Wahlefeld
- Institut für Chemie: Physikalische Chemie/Biophysikalische Chemie, Sekr. PC14; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Deutschland
| | - Eckhard Bill
- Abteilung Molekulare Theorie und Spektroskopie; Max-Planck-Institut für Chemische Energiekonversion; Mülheim a. d. Ruhr Deutschland
| | - Tibor Szilvási
- Department of Chemical and Biological Engineering; University of Wisconsin, Madison; USA
| | - Christopher Eberle
- Institut für Chemie: Metallorganik und Anorganische Materialien, Sekr. C2; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Deutschland
| | - Shenglai Yao
- Institut für Chemie: Metallorganik und Anorganische Materialien, Sekr. C2; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Deutschland
| | - Peter Hildebrandt
- Institut für Chemie: Physikalische Chemie/Biophysikalische Chemie, Sekr. PC14; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Deutschland
| | - Marius Horch
- Institut für Chemie: Physikalische Chemie/Biophysikalische Chemie, Sekr. PC14; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Deutschland
| | - Ingo Zebger
- Institut für Chemie: Physikalische Chemie/Biophysikalische Chemie, Sekr. PC14; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Deutschland
| | - Matthias Driess
- Institut für Chemie: Metallorganik und Anorganische Materialien, Sekr. C2; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Deutschland
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19
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Zhang X, Zhang T, Li B, Zhang G, Hai L, Ma X, Wu W. Direct synthesis of phenol by novel [FeFe]-hydrogenase model complexes as catalysts of benzene hydroxylation with H2O2. RSC Adv 2017. [DOI: 10.1039/c6ra27831k] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Compared the catalytic performance of complexes 1–3, the complex 2 has the highest phenol yield (24.6%) and phenol selectivity (92%), which has the highest electron densities of the catalytically active sites.
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Affiliation(s)
- Xia Zhang
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300354
- China
| | - Tianyong Zhang
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300354
- China
| | - Bin Li
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300354
- China
| | - Guanghui Zhang
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300354
- China
| | - Li Hai
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300354
- China
| | - Xiaoyuan Ma
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300354
- China
| | - Wubin Wu
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300354
- China
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20
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Liu YC, Chu KT, Huang YL, Hsu CH, Lee GH, Tseng MC, Chiang MH. Protonation/Reduction of Carbonyl-Rich Diiron Complexes and the Direct Observation of Triprotonated Species: Insights into the Electrocatalytic Mechanism of Hydrogen Formation. ACS Catal 2016. [DOI: 10.1021/acscatal.5b02646] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yu-Chiao Liu
- Institute
of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
| | - Kai-Ti Chu
- Institute
of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
- Molecular
Science and Technology Program, TIGP, Institute of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
- Department
of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan
| | - Yi-Lan Huang
- Institute
of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
| | - Cheng-Huey Hsu
- Institute
of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
| | - Gene-Hsiang Lee
- Instrumentation
Center, National Taiwan University, Taipei 106, Taiwan
| | - Mei-Chun Tseng
- Institute
of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
| | - Ming-Hsi Chiang
- Institute
of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
- Molecular
Science and Technology Program, TIGP, Institute of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
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21
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Zipoli F, Car R, Cohen MH, Selloni A. Theoretical Design by First Principles Molecular Dynamics of a Bioinspired Electrode-Catalyst System for Electrocatalytic Hydrogen Production from Acidified Water. J Chem Theory Comput 2015; 6:3490-502. [PMID: 26617099 DOI: 10.1021/ct100319b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Bacterial di-iron hydrogenases produce hydrogen efficiently from water. Accordingly, we have studied by first-principles molecular-dynamics simulations (FPMD) electrocatalytic hydrogen production from acidified water by their common active site, the [FeFe]H cluster, extracted from the enzyme and linked directly to the (100) surface of a pyrite electrode. We found that the cluster could not be attached stably to the surface via a thiol link analogous to that which attaches it to the rest of the enzyme, despite the similarity of the (100) pyrite surface to the Fe4S4 cubane to which it is linked in the enzyme. We report here a systematic sequence of modifications of the structure and composition of the cluster devised to maintain the structural stability of the pyrite/cluster complex in water throughout its hydrogen production cycle, an example of the molecular design of a complex system by FPMD.
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Affiliation(s)
- Federico Zipoli
- Department of Chemistry and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854
| | - Roberto Car
- Department of Chemistry and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854
| | - Morrel H Cohen
- Department of Chemistry and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854
| | - Annabella Selloni
- Department of Chemistry and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854
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22
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Vedha SA, Velmurugan G, Jagadeesan R, Venuvanalingam P. Insights from the computational studies on the oxidized as-isolated state of [NiFeSe] hydrogenase from D. vulgaris Hildenborough. Phys Chem Chem Phys 2015. [PMID: 26205195 DOI: 10.1039/c5cp03071d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A density functional theory study of the active site structure and features of the oxygen tolerant [NiFeSe] Hase in the oxidized as-isolated state of the enzyme D. vulgaris Hildenborough (DvH) is reported here. The three conformers reported to be present in the X-ray structure (PDB ID: ) have been studied. The novel bidentate interchalcogen ligand (S-Se) in Conf-I of the [NiFeSe] Hase reported for the first time in hydrogenases (Hase) is found to be of donor-acceptor type with an uneven η(2) L → M σ-bond. The symmetry mismatch at the sp orbital of Se and at the dz(2) orbital of Ni has been identified to be the reason for the inability of Conf-II to convert to Conf-I. NBO analysis shows that the sulfinate ligand peculiar to the state stabilizes the active site through n →π* interactions. The results reveal that the isolated oxidized state of the [NiFeSe] Hase is significantly different from the well-known [NiFe] Hase.
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Affiliation(s)
- Swaminathan Angeline Vedha
- Theoretical and Computational Chemistry Laboratory, School of Chemistry, Bharathidasan University, Tiruchirappalli-620 024, India.
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23
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Hydride bridge in [NiFe]-hydrogenase observed by nuclear resonance vibrational spectroscopy. Nat Commun 2015; 6:7890. [PMID: 26259066 PMCID: PMC4531378 DOI: 10.1038/ncomms8890] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 06/18/2015] [Indexed: 11/28/2022] Open
Abstract
The metabolism of many anaerobes relies on [NiFe]-hydrogenases, whose characterization when bound to substrates has proven non-trivial. Presented here is direct evidence for a hydride bridge in the active site of the 57Fe-labelled fully reduced Ni-R form of Desulfovibrio vulgaris Miyazaki F [NiFe]-hydrogenase. A unique ‘wagging' mode involving H− motion perpendicular to the Ni(μ-H)57Fe plane was studied using 57Fe-specific nuclear resonance vibrational spectroscopy and density functional theory (DFT) calculations. On Ni(μ-D)57Fe deuteride substitution, this wagging causes a characteristic perturbation of Fe–CO/CN bands. Spectra have been interpreted by comparison with Ni(μ-H/D)57Fe enzyme mimics [(dppe)Ni(μ-pdt)(μ-H/D)57Fe(CO)3]+ and DFT calculations, which collectively indicate a low-spin Ni(II)(μ-H)Fe(II) core for Ni-R, with H− binding Ni more tightly than Fe. The present methodology is also relevant to characterizing Fe–H moieties in other important natural and synthetic catalysts. Understanding the catalytic mechanism of redox-active hydrogenases is a key to efficient hydrogen production and consumption. Here, the authors use nuclear resonance vibrational spectroscopy to study [NiFe]-hydrogenase, and observe a bridging hydride structure in an EPR silent intermediate.
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24
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Oughli AA, Conzuelo F, Winkler M, Happe T, Lubitz W, Schuhmann W, Rüdiger O, Plumeré N. A redox hydrogel protects the O2 -sensitive [FeFe]-hydrogenase from Chlamydomonas reinhardtii from oxidative damage. Angew Chem Int Ed Engl 2015; 54:12329-33. [PMID: 26073322 DOI: 10.1002/anie.201502776] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Indexed: 01/10/2023]
Abstract
The integration of sensitive catalysts in redox matrices opens up the possibility for their protection from deactivating molecules such as O2 . [FeFe]-hydrogenases are enzymes catalyzing H2 oxidation/production which are irreversibly deactivated by O2 . Therefore, their use under aerobic conditions has never been achieved. Integration of such hydrogenases in viologen-modified hydrogel films allows the enzyme to maintain catalytic current for H2 oxidation in the presence of O2 , demonstrating a protection mechanism independent of reactivation processes. Within the hydrogel, electrons from the hydrogenase-catalyzed H2 oxidation are shuttled to the hydrogel-solution interface for O2 reduction. Hence, the harmful O2 molecules do not reach the hydrogenase. We illustrate the potential applications of this protection concept with a biofuel cell under H2 /O2 mixed feed.
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Affiliation(s)
- Alaa Alsheikh Oughli
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr (Germany)
| | - Felipe Conzuelo
- Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum (Germany)
| | - Martin Winkler
- Lehrstuhl Biochemie der Pflanzen, AG Photobiotechnologie, Ruhr Universität Bochum, Universitätsstrasse 150, 44801 Bochum (Germany)
| | - Thomas Happe
- Lehrstuhl Biochemie der Pflanzen, AG Photobiotechnologie, Ruhr Universität Bochum, Universitätsstrasse 150, 44801 Bochum (Germany)
| | - Wolfgang Lubitz
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr (Germany)
| | - Wolfgang Schuhmann
- Analytical Chemistry-Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum (Germany)
| | - Olaf Rüdiger
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr (Germany).
| | - Nicolas Plumeré
- Center for Electrochemical Sciences-Molecular Nanostructures, Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum (Germany).
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25
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Oughli AA, Conzuelo F, Winkler M, Happe T, Lubitz W, Schuhmann W, Rüdiger O, Plumeré N. Ein Redoxhydrogel schützt die O2-empfindliche [FeFe]-Hydrogenase ausChlamydomonas reinhardtiivor oxidativer Zerstörung. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502776] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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26
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Liu T, Liao Q, O’Hagan M, Hulley EB, DuBois DL, Bullock RM. Iron Complexes Bearing Diphosphine Ligands with Positioned Pendant Amines as Electrocatalysts for the Oxidation of H2. Organometallics 2015. [DOI: 10.1021/om501289f] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
| | - Qian Liao
- Center
for Molecular Electrocatalysis, Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352 United States
- Department
of Chemistry, Tsinghua University, Beijing 100084, China
| | - Molly O’Hagan
- Center
for Molecular Electrocatalysis, Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352 United States
| | - Elliott B. Hulley
- Department
of Chemistry, University of Wyoming, Dept. 3838, Laramie, Wyoming 82071 United States
| | - Daniel L. DuBois
- Center
for Molecular Electrocatalysis, Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352 United States
| | - R. Morris Bullock
- Center
for Molecular Electrocatalysis, Physical Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, K2-12, Richland, Washington 99352 United States
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27
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Uzunova EL, Mikosch H. Electronic, magnetic structure and water splitting reactivity of the iron-sulfur dimers and their hexacarbonyl complexes: A density functional study. J Chem Phys 2015; 141:044307. [PMID: 25084910 DOI: 10.1063/1.4890650] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The iron sulfide dimers (FeS)2 and their persulfide isomers with S-S bonds are studied with the B3LYP density functional as bare clusters and as hexacarbonyls. The disulfides are more stable than the persulfides as bare clusters and the persulfide ground state lies at 3.2 eV above the global minimum, while in the hexacarbonyl complexes this order is reversed: persulfides are more stable, but the energy gap between disulfides and persulfides becomes much smaller and the activation barrier for the transition persulfide → disulfide is 1.11 eV. Carbonylation also favors a non-planar Fe2S2 ring for both the disulfides and the persulfides and high electron density in the Fe2S2 core is induced. The diamagnetic ordering is preferred in the hexacarbonyls, unlike the bare clusters. The hexacarbonyls possess low-lying triplet excited states. In the persulfide, the lowest singlet-to-triplet state excitation occurs by electron transition from the iron centers to an orbital located predominantly at S2 via metal-to-ligand charge transfer. In the disulfide this excitation corresponds to ligand-to-metal charge transfer from the sulfur atoms to an orbital located at the iron centers and the Fe-Fe bond. Water splitting occurs on the hexacarbonyls, but not on the bare clusters. The singlet and triplet state reaction paths were examined and activation barriers were determined: 50 kJ mol(-1) for HO-H bond dissociation and 210 kJ mol(-1) for hydrogen evolution from the intermediate sulfoxyl-hydroxyl complexes Fe2S(OH)(SH)(CO)6 formed. The lowest singlet-singlet excitations in the hexacarbonyls, the water adsorption complexes and in the reaction intermediates, formed prior to dihydrogen release, fall in the visible light region. The energy barrier of 210 kJ mol(-1) for the release of one hydrogen molecule corresponds to one visible photon of 570 nm. The dissociation of a second water molecule, followed by H2 and O2 release via hydro-peroxide intermediate is a two-step process, with activation barriers of 218 and 233 kJ mol(-1), which also fall in the visible light region. A comparison of the full reaction path with that on diiron dioxide hexacarbonyls Fe2O2(CO)6 is traced.
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Affiliation(s)
- Ellie L Uzunova
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
| | - Hans Mikosch
- Institute for Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9/E164-EC, 1060 Vienna, Austria
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28
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Swanson KD, Ratzloff MW, Mulder DW, Artz JH, Ghose S, Hoffman A, White S, Zadvornyy OA, Broderick JB, Bothner B, King PW, Peters JW. [FeFe]-Hydrogenase Oxygen Inactivation Is Initiated at the H Cluster 2Fe Subcluster. J Am Chem Soc 2015; 137:1809-16. [DOI: 10.1021/ja510169s] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Kevin D. Swanson
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Michael W. Ratzloff
- Biosciences
Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - David W. Mulder
- Biosciences
Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Jacob H. Artz
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Shourjo Ghose
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Andrew Hoffman
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Spencer White
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Oleg A. Zadvornyy
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Joan B. Broderick
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Brian Bothner
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Paul W. King
- Biosciences
Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - John W. Peters
- Department
of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
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29
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Wang X, Zhang T, Yang Q, Jiang S, Li B. Synthesis and Characterization of Bio-Inspired Diiron Complexes and Their Catalytic Activity for Direct Hydroxylation of Aromatic Compounds. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201402918] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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30
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Wang Y, Zhang T, Li B, Jiang S, Sheng L. Synthesis, characterization, electrochemical properties and catalytic reactivity of N-heterocyclic carbene-containing diiron complexes. RSC Adv 2015. [DOI: 10.1039/c4ra15150j] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Four new [Fe–Fe]–NHC complexes were synthesized and used as highly selective homogeneous catalysts for the direct hydroxylation of benzene to phenol.
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Affiliation(s)
- Yanhong Wang
- School of Chemical Engineering and Technology
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Tianyong Zhang
- School of Chemical Engineering and Technology
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Bin Li
- School of Chemical Engineering and Technology
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Shuang Jiang
- School of Chemical Engineering and Technology
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Liao Sheng
- School of Chemical Engineering and Technology
- Tianjin Key Laboratory of Applied Catalysis Science and Technology
- Tianjin University
- Tianjin 300072
- China
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31
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Liu C, Liu T, Hall MB. Influence of the Density Functional and Basis Set on the Relative Stabilities of Oxygenated Isomers of Diiron Models for the Active Site of [FeFe]-Hydrogenase. J Chem Theory Comput 2014; 11:205-14. [DOI: 10.1021/ct500594z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Caiping Liu
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
- State
Key Laboratory of Structure Chemistry, Fujian Institute of Research
on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, P. R. China, 350002
| | - Tianbiao Liu
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
- Energy
Processes and Materials Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, Richland, Washington 99352, United States
| | - Michael B. Hall
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
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32
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Dey S, Rana A, Crouthers D, Mondal B, Das PK, Darensbourg MY, Dey A. Electrocatalytic O2 Reduction by [Fe-Fe]-Hydrogenase Active Site Models. J Am Chem Soc 2014; 136:8847-50. [DOI: 10.1021/ja5021684] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Subal Dey
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata, India 700032
| | - Atanu Rana
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata, India 700032
| | - Danielle Crouthers
- Depertment of Chemistry, Texas A & M University, College Station, Texas TX-77843, United States
| | - Biswajit Mondal
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata, India 700032
| | - Pradip Kumar Das
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata, India 700032
| | - Marcetta Y. Darensbourg
- Depertment of Chemistry, Texas A & M University, College Station, Texas TX-77843, United States
| | - Abhishek Dey
- Department
of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata, India 700032
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33
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Chmielowiec B, Saadi FH, Baricuatro JH, Javier A, Kim YG, Sun G, Darensbourg MY, Soriaga MP. Molecular catalysis that transpires only when the complex is heterogenized: Studies of a hydrogenase complex surface-tethered on polycrystalline and (1 1 1)-faceted gold by EC, PM-FT-IRRAS, HREELS, XPS and STM. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2013.12.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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34
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Widger LR, Davies CG, Yang T, Siegler MA, Troeppner O, Jameson GNL, Ivanović-Burmazović I, Goldberg DP. Dramatically accelerated selective oxygen-atom transfer by a nonheme iron(IV)-oxo complex: tuning of the first and second coordination spheres. J Am Chem Soc 2014; 136:2699-702. [PMID: 24471779 PMCID: PMC4004223 DOI: 10.1021/ja410240c] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
The
new ligand N3PyamideSR and its FeII complex
[FeII(N3PyamideSR)](BF4)2 (1) are described. Reaction of 1 with
PhIO at −40 °C gives metastable [FeIV(O)(N3PyamideSR)]2+ (2), containing a sulfide
ligand and a single amide H-bond donor in proximity to the terminal
oxo group. Direct evidence for H-bonding is seen in a structural analogue,
[FeII(Cl)(N3PyamideSR)](BF4)2 (3). Complex 2 exhibits rapid O-atom
transfer (OAT) toward external sulfide substrates, but no intramolecular
OAT. However, direct S-oxygenation does occur in
the reaction of 1 with mCPBA, yielding sulfoxide-ligated
[FeII(N3PyamideS(O)R)](BF4)2 (4). Catalytic OAT with 1 was also observed.
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Affiliation(s)
- Leland R Widger
- Department of Chemistry, The Johns Hopkins University , 3400 North Charles Street, Baltimore, Maryland 21218, United States
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35
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Teramoto Y, Kubo K, Kume S, Mizuta T. Formation of a Hexacarbonyl Diiron Complex Having a Naphthalene-1,8-bis(phenylphosphido) Bridge and the Electrochemical Behavior of Its Derivatives. Organometallics 2013. [DOI: 10.1021/om4006142] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuichi Teramoto
- Department
of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-hiroshima 739-8526, Japan
| | - Kazuyuki Kubo
- Department
of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-hiroshima 739-8526, Japan
| | - Shoko Kume
- Department
of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-hiroshima 739-8526, Japan
| | - Tsutomu Mizuta
- Department
of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-hiroshima 739-8526, Japan
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36
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Liu YC, Chu KT, Jhang RL, Lee GH, Chiang MH. [FeFe] hydrogenase active site modeling: a key intermediate bearing a thiolate proton and Fe hydride. Chem Commun (Camb) 2013; 49:4743-5. [PMID: 23505629 DOI: 10.1039/c3cc39008j] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first di-protonated [FeFe] hydrogenase model relevant to key intermediates in catalytic hydrogen production is reported. The complex bearing the S-proton and Fe-hydride is structurally and spectroscopically characterized as well as studied by DFT calculations. The results show that the thiolate sulfur can accept protons during the catalytic routes.
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Affiliation(s)
- Yu-Chiao Liu
- Institute of Chemistry, Academia Sinica, Nankang, Taipei 115, Taiwan
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37
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Deeb RS, Nuriel T, Cheung C, Summers B, Lamon BD, Gross SS, Hajjar DP. Characterization of a cellular denitrase activity that reverses nitration of cyclooxygenase. Am J Physiol Heart Circ Physiol 2013; 305:H687-98. [PMID: 23792683 PMCID: PMC3761327 DOI: 10.1152/ajpheart.00876.2012] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Accepted: 06/20/2013] [Indexed: 12/11/2022]
Abstract
Protein 3-nitrotyrosine (3-NT) formation is frequently regarded as a simple biomarker of disease, an irreversible posttranslational modification that can disrupt protein structure and function. Nevertheless, evidence that protein 3-NT modifications may be site selective and reversible, thus allowing for physiological regulation of protein activity, has begun to emerge. We have previously reported that cyclooxygenase (COX)-1 undergoes heme-dependent nitration of Tyr(385), an internal and catalytically essential residue. In the present study, we demonstrate that nitrated COX-1 undergoes a rapid reversal of nitration by substrate-selective and biologically regulated denitrase activity. Using nitrated COX-1 as a substrate, denitrase activity was validated and quantified by analytic HPLC with electrochemical detection and determined to be constitutively active in murine and human endothelial cells, macrophages, and a variety of tissue samples. Smooth muscle cells, however, contained little denitrase activity. Further characterizing this denitrase activity, we found that it was inhibited by free 3-NT and may be enhanced by endogenous nitric oxide and exogenously administered carbon monoxide. Finally, we describe a purification protocol that results in significant enrichment of a discrete denitrase-containing fraction, which maintains activity throughout the purification process. These findings reveal that nitrated COX-1 is a substrate for a denitrase in cells and tissues, implying that the reciprocal processes of nitration and denitration may modulate bioactive lipid synthesis in the setting of inflammation. In addition, our data reveal that denitration is a controlled process that may have broad importance for regulating cell signaling events in nitric oxide-generating systems during oxidative/nitrosative stress.
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MESH Headings
- Adaptation, Physiological/physiology
- Animals
- Cell Line
- Cells, Cultured
- Cyclooxygenase 1/metabolism
- Endothelium, Vascular/cytology
- Endothelium, Vascular/metabolism
- Humans
- Macrophages/cytology
- Macrophages/metabolism
- Mice
- Mice, Inbred C57BL
- Models, Animal
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/metabolism
- Nitrates/metabolism
- Nitric Oxide/metabolism
- Nitric Oxide Synthase/metabolism
- Oxidative Stress/physiology
- Oxidoreductases/metabolism
- Rats
- Tyrosine/analogs & derivatives
- Tyrosine/metabolism
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Affiliation(s)
- Ruba S Deeb
- Department of Pathology, Weill Cornell Medical College, Cornell University, New York, New York
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38
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Oxygen tolerance of an in silico-designed bioinspired hydrogen-evolving catalyst in water. Proc Natl Acad Sci U S A 2013; 110:2017-22. [PMID: 23341607 DOI: 10.1073/pnas.1215149110] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Certain bacterial enzymes, the diiron hydrogenases, have turnover numbers for hydrogen production from water as large as 10(4)/s. Their much smaller common active site, composed of earth-abundant materials, has a structure that is an attractive starting point for the design of a practical catalyst for electrocatalytic or solar photocatalytic hydrogen production from water. In earlier work, our group has reported the computational design of [FeFe](P)/FeS(2), a hydrogenase-inspired catalyst/electrode complex, which is efficient and stable throughout the production cycle. However, the diiron hydrogenases are highly sensitive to ambient oxygen by a mechanism not yet understood in detail. An issue critical for practical use of [FeFe](P)/FeS(2) is whether this catalyst/electrode complex is tolerant to the ambient oxygen. We report demonstration by ab initio simulations that the complex is indeed tolerant to dissolved oxygen over timescales long enough for practical application, reducing it efficiently. This promising hydrogen-producing catalyst, composed of earth-abundant materials and with a diffusion-limited rate in acidified water, is efficient as well as oxygen tolerant.
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39
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Leidel N, Hsieh CH, Chernev P, Sigfridsson KGV, Darensbourg MY, Haumann M. Bridging-hydride influence on the electronic structure of an [FeFe] hydrogenase active-site model complex revealed by XAES-DFT. Dalton Trans 2013; 42:7539-54. [DOI: 10.1039/c3dt33042g] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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40
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Zaffaroni R, Rauchfuss TB, Gray DL. Terminal vs bridging hydrides of diiron dithiolates: protonation of Fe2(dithiolate)(CO)2(PMe3)4. J Am Chem Soc 2012; 134:19260-9. [PMID: 23095145 PMCID: PMC3518320 DOI: 10.1021/ja3094394] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
This investigation examines the protonation of diiron dithiolates, exploiting the new family of exceptionally electron-rich complexes Fe(2)(xdt)(CO)(2)(PMe(3))(4), where xdt is edt (ethanedithiolate, 1), pdt (propanedithiolate, 2), and adt (2-aza-1,3-propanedithiolate, 3), prepared by the photochemical substitution of the corresponding hexacarbonyls. Compounds 1-3 oxidize near -950 mV vs Fc(+/0). Crystallographic analyses confirm that 1 and 2 adopt C(2)-symmetric structures (Fe-Fe = 2.616 and 2.625 Å, respectively). Low-temperature protonation of 1 afforded exclusively [μ-H1](+), establishing the non-intermediacy of the terminal hydride ([t-H1](+)). At higher temperatures, protonation afforded mainly [t-H1](+). The temperature dependence of the ratio [t-H1](+)/[μ-H1](+) indicates that the barriers for the two protonation pathways differ by ∼4 kcal/mol. Low-temperature (31)P{(1)H} NMR measurements indicate that the protonation of 2 proceeds by an intermediate, proposed to be the S-protonated dithiolate [Fe(2)(Hpdt)(CO)(2)(PMe(3))(4)](+) ([S-H2](+)). This intermediate converts to [t-H2](+) and [μ-H2](+) by first-order and second-order processes, respectively. DFT calculations support transient protonation at sulfur and the proposal that the S-protonated species (e.g., [S-H2](+)) rearranges to the terminal hydride intramolecularly via a low-energy pathway. Protonation of 3 affords exclusively terminal hydrides, regardless of the acid or conditions, to give [t-H3](+), which isomerizes to [t-H3'](+), wherein all PMe(3) ligands are basal.
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Affiliation(s)
| | | | - Danielle L. Gray
- Department of Chemistry, University of Illinois Urbana, IL 61801, USA
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41
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The antioxidant effects of the butterfly cluster [(μ-SeCH2)2CH(OH)]Fe2(CO)6 on radical-induced oxidation of DNA. Med Chem Res 2012. [DOI: 10.1007/s00044-012-0281-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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42
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Shafaat HS, Weber K, Petrenko T, Neese F, Lubitz W. Key Hydride Vibrational Modes in [NiFe] Hydrogenase Model Compounds Studied by Resonance Raman Spectroscopy and Density Functional Calculations. Inorg Chem 2012; 51:11787-97. [DOI: 10.1021/ic3017276] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hannah S. Shafaat
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Katharina Weber
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Taras Petrenko
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Frank Neese
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
| | - Wolfgang Lubitz
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D-45470 Mülheim
an der Ruhr, Germany
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43
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Coggins MK, Toledo S, Shaffer E, Kaminsky W, Shearer J, Kovacs JA. Characterization and dioxygen reactivity of a new series of coordinatively unsaturated thiolate-ligated manganese(II) complexes. Inorg Chem 2012; 51:6633-44. [PMID: 22642272 DOI: 10.1021/ic300192q] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis, structural, and spectroscopic characterization of four new coordinatively unsaturated mononuclear thiolate-ligated manganese(II) complexes ([Mn(II)(S(Me2)N(4)(6-Me-DPEN))](BF(4)) (1), [Mn(II)(S(Me2)N(4)(6-Me-DPPN))](BPh(4))·MeCN (3), [Mn(II)(S(Me2)N(4)(2-QuinoPN))](PF(6))·MeCN·Et(2)O (4), and [Mn(II)(S(Me2)N(4)(6-H-DPEN)(MeOH)](BPh(4)) (5)) is described, along with their magnetic, redox, and reactivity properties. These complexes are structurally related to recently reported [Mn(II)(S(Me2)N(4)(2-QuinoEN))](PF(6)) (2) (Coggins, M. K.; Kovacs, J. A. J. Am. Chem. Soc.2011, 133, 12470). Dioxygen addition to complexes 1-5 is shown to result in the formation of five new rare examples of Mn(III) dimers containing a single, unsupported oxo bridge: [Mn(III)(S(Me2)N(4)(6-Me-DPEN)](2)-(μ-O)(BF(4))(2)·2MeOH (6), [Mn(III)(S(Me2)N(4)(QuinoEN)](2)-(μ-O)(PF(6))(2)·Et(2)O (7), [Mn(III)(S(Me2)N(4)(6-Me-DPPN)](2)-(μ-O)(BPh(4))(2) (8), [Mn(III)(S(Me2)N(4)(QuinoPN)](2)-(μ-O)(BPh(4))(2) (9), and [Mn(III)(S(Me2)N(4)(6-H-DPEN)](2)-(μ-O)(PF(6))(2)·2MeCN (10). Labeling studies show that the oxo atom is derived from (18)O(2). Ligand modifications, involving either the insertion of a methylene into the backbone or the placement of an ortho substituent on the N-heterocyclic amine, are shown to noticeably modulate the magnetic and reactivity properties. Fits to solid-state magnetic susceptibility data show that the Mn(III) ions of μ-oxo dimers 6-10 are moderately antiferromagnetically coupled, with coupling constants (2J) that fall within the expected range. Metastable intermediates, which ultimately convert to μ-oxo bridged 6 and 7, are observed in low-temperature reactions between 1 and 2 and dioxygen. Complexes 3-5, on the other hand, do not form observable intermediates, thus illustrating the effect that relatively minor ligand modifications have upon the stability of metastable dioxygen-derived species.
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Affiliation(s)
- Michael K Coggins
- The Department of Chemistry, University of Washington, Campus Box 351700, Seattle, Washington 98195-1700, USA
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44
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Olsen MT, Rauchfuss TB, Zaffaroni R. Reaction of Aryl Diazonium Salts and Diiron(I) Dithiolato Carbonyls: Evidence for Radical Intermediates. Organometallics 2012; 31:3447-3450. [PMID: 22962513 DOI: 10.1021/om300107s] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Treatment of Fe(2)(pdt)(CO)(4)(dppv) (1) with aryldiazonium salts affords the 34e(-) adducts [Fe(2)(pdt)(μ-N(2)Ar)(CO)(4)(dppv)](+) (pdt(2-) = 1,3-propanedithiolate, dppv = cis-C(2)H(2)(PPh(2))(2)). Under some conditions, the same reaction gave substantial amounts of [1](+), the product of electron-transfer. Consistent with the influence of electron transfer in the reactions of some electrophiles with Fe(I)Fe(I) dithiolates, the reaction of [Me(3)S(2)](+) and Fe(2)(pdt)(CO)(4)(dppbz) was found to give [Fe(2)(pdt)(CO)(4)(dppbz)](+) as well as Me(2)S and Me(2)S(2) (dppbz = 1,2-bis(diphenylphosphino)benzene).
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Affiliation(s)
- Matthew T Olsen
- School of Chemical Sciences, University of Illinois, Urbana, IL 61801
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45
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Bolligarla R, Das SK. Sulfur Oxygenation of [Ni(btdt)
2
]
2–
by Aerial Oxidation under Ambient Conditions – Syntheses, Crystal Structures, and Properties of [Bu
4
N]
2
[Ni(btdt)
2
] and [Bu
4
N]
2
[Ni(btdtO
2
)
2
]·H
2
O ({btdt}
2–
= 2,1,3‐Benzenethiadiazole‐5,6‐dithiolate). Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201101426] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ramababu Bolligarla
- School of Chemistry, University of Hyderabad, P. O. Central University, Hyderabad 500046, Andhra Pradesh, India, Fax: +91‐40‐2301‐2460
| | - Samar K. Das
- School of Chemistry, University of Hyderabad, P. O. Central University, Hyderabad 500046, Andhra Pradesh, India, Fax: +91‐40‐2301‐2460
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46
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Schilter D, Nilges MJ, Chakrabarti M, Lindahl PA, Rauchfuss TB, Stein M. Mixed-valence nickel-iron dithiolate models of the [NiFe]-hydrogenase active site. Inorg Chem 2012; 51:2338-48. [PMID: 22304696 PMCID: PMC3288512 DOI: 10.1021/ic202329y] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of mixed-valence nickel-iron dithiolates is described. Oxidation of (diphosphine)Ni(dithiolate)Fe(CO)(3) complexes 1, 2, and 3 with ferrocenium salts affords the corresponding tricarbonyl cations [(dppe)Ni(pdt)Fe(CO)(3)](+) ([1](+)), [(dppe)Ni(edt)Fe(CO)(3)](+) ([2](+)) and [(dcpe)Ni(pdt)Fe(CO)(3)](+) ([3](+)), respectively, where dppe = Ph(2)PCH(2)CH(2)PPh(2), dcpe = Cy(2)PCH(2)CH(2)PCy(2), (Cy = cyclohexyl), pdtH(2) = HSCH(2)CH(2)CH(2)SH, and edtH(2) = HSCH(2)CH(2)SH. The cation [2](+) proved unstable, but the propanedithiolates are robust. IR and EPR spectroscopic measurements indicate that these species exist as C(s)-symmetric species. Crystallographic characterization of [3]BF(4) shows that Ni is square planar. Interaction of [1]BF(4) with P-donor ligands (L) afforded a series of substituted derivatives of type [(dppe)Ni(pdt)Fe(CO)(2)L]BF(4) for L = P(OPh)(3) ([4a]BF(4)), P(p-C(6)H(4)Cl)(3) ([4b]BF(4)), PPh(2)(2-py) ([4c]BF(4)), PPh(2)(OEt) ([4d]BF(4)), PPh(3) ([4e]BF(4)), PPh(2)(o-C(6)H(4)OMe) ([4f]BF(4)), PPh(2)(o-C(6)H(4)OCH(2)OMe) ([4g]BF(4)), P(p-tol)(3) ([4h]BF(4)), P(p-C(6)H(4)OMe)(3) ([4i]BF(4)), and PMePh(2) ([4j]BF(4)). EPR analysis indicates that ethanedithiolate [2](+) exists as a single species at 110 K, whereas the propanedithiolate cations exist as a mixture of two conformers, which are proposed to be related through a flip of the chelate ring. Mössbauer spectra of 1 and oxidized S = 1/2 [4e]BF(4) are both consistent with a low-spin Fe(I) state. The hyperfine coupling tensor of [4e]BF(4) has a small isotropic component and significant anisotropy. DFT calculations using the BP86, B3LYP, and PBE0 exchange-correlation functionals agree with the structural and spectroscopic data, suggesting that the SOMOs in complexes of the present type are localized in an Fe(I)-centered d(z(2)) orbital. The DFT calculations allow an assignment of oxidation states of the metals and rationalization of the conformers detected by EPR spectroscopy. Treatment of [1](+) with CN(-) and compact basic phosphines results in complex reactions. With dppe, [1](+) undergoes quasi-disproportionation to give 1 and the diamagnetic complex [(dppe)Ni(pdt)Fe(CO)(2)(dppe)](2+) ([5](2+)), which features square-planar Ni linked to an octahedral Fe center.
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Affiliation(s)
- David Schilter
- Department of Chemistry, University of Illinois, 600 South Goodwin Avenue, Urbana, Illinois 61801, United States
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47
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Jayapal P, Rajaraman G. On the controversy of metal ion composition on amine oxygenase (AurF): a computational investigation. Phys Chem Chem Phys 2012; 14:9050-3. [DOI: 10.1039/c2cp40874k] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Oxidation State Changes and Electron Flow in Enzymatic Catalysis and Electrocatalysis through Wannier-Function Analysis. Chemistry 2011; 17:12136-43. [DOI: 10.1002/chem.201101916] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Indexed: 12/21/2022]
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49
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Electrocatalyst design from first principles: A hydrogen-production catalyst inspired by nature. Catal Today 2011. [DOI: 10.1016/j.cattod.2010.12.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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50
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Darensbourg MY, Weigand W. Sulfoxygenation of Active Site Models of [NiFe] and [FeFe] Hydrogenases – A Commentary on Possible Chemical Models of Hydrogenase Enzyme Oxygen Sensitivity. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201001148] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | - Wolfgang Weigand
- Institut für Anorganische und Analytische Chemie, Friedrich‐Schiller‐Universität Jena, August‐Bebel‐Straße 2, 07743 Jena, Germany
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