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Du K, Zhang L, Shan J, Guo J, Mao J, Yang CC, Wang CH, Hu Z, Ling T. Interface engineering breaks both stability and activity limits of RuO2 for sustainable water oxidation. Nat Commun 2022; 13:5448. [PMID: 36114207 PMCID: PMC9481627 DOI: 10.1038/s41467-022-33150-x] [Citation(s) in RCA: 44] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Accepted: 09/06/2022] [Indexed: 11/18/2022] Open
Abstract
Designing catalytic materials with enhanced stability and activity is crucial for sustainable electrochemical energy technologies. RuO2 is the most active material for oxygen evolution reaction (OER) in electrolysers aiming at producing ‘green’ hydrogen, however it encounters critical electrochemical oxidation and dissolution issues during reaction. It remains a grand challenge to achieve stable and active RuO2 electrocatalyst as the current strategies usually enhance one of the two properties at the expense of the other. Here, we report breaking the stability and activity limits of RuO2 in neutral and alkaline environments by constructing a RuO2/CoOx interface. We demonstrate that RuO2 can be greatly stabilized on the CoOx substrate to exceed the Pourbaix stability limit of bulk RuO2. This is realized by the preferential oxidation of CoOx during OER and the electron gain of RuO2 through the interface. Besides, a highly active Ru/Co dual-atom site can be generated around the RuO2/CoOx interface to synergistically adsorb the oxygen intermediates, leading to a favourable reaction path. The as-designed RuO2/CoOx catalyst provides an avenue to achieve stable and active materials for sustainable electrochemical energy technologies. RuO2 encounters critical electrochemical dissolution issues during oxygen evolution reaction and it remains a grand challenge to achieve stable and active RuO2 electrocatalyst. Here, the authors report breaking stability and activity limits of RuO2 by constructing a RuO2/CoOx interface.
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Managing argon interference during measurements of 18O/ 16O ratios in O 2 by continuous-flow isotope ratio mass spectrometry. Anal Bioanal Chem 2022; 414:6177-6186. [PMID: 35841416 PMCID: PMC9314310 DOI: 10.1007/s00216-022-04184-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 06/08/2022] [Accepted: 06/17/2022] [Indexed: 11/08/2022]
Abstract
Abstract Monitoring changes in stable oxygen isotope ratios in molecular oxygen allows for studying many fundamental processes in bio(geo)chemistry and environmental sciences. While the measurement of \documentclass[12pt]{minimal}
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\begin{document}$$^{18}$$\end{document}18O/\documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {O}_{2}$$\end{document}O2 in gaseous samples can be carried out conveniently and from extracting moderately small aqueous samples for analyses by continuous-flow isotope ratio mass spectrometry (CF-IRMS), oxygen isotope signatures, \documentclass[12pt]{minimal}
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\begin{document}$$\updelta ^{18}$$\end{document}δ18O, could be overestimated by more than 6\documentclass[12pt]{minimal}
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\begin{document}$$\permille$$\end{document}‱ because of interferences from argon in air. Here, we systematically evaluated the extent of such Ar interferences on \documentclass[12pt]{minimal}
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\begin{document}$$^{18}$$\end{document}18O/\documentclass[12pt]{minimal}
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\begin{document}$$^{16}$$\end{document}16O ratios of \documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {O}_{2}$$\end{document}O2 for measurements by gas chromatography/IRMS and GasBench/IRMS and propose simple instrumental modifications for improved Ar and \documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {O}_{2}$$\end{document}O2 separation as well as post-measurement correction procedures for obtaining accurate \documentclass[12pt]{minimal}
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\begin{document}$$\updelta ^{18}$$\end{document}δ18O. We subsequently evaluated the consequences of Ar interferences for the quantification of O isotope fractionation in terms of isotope enrichment factors, \documentclass[12pt]{minimal}
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\begin{document}$$\upepsilon _{\mathrm {O}}$$\end{document}ϵO, and \documentclass[12pt]{minimal}
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\begin{document}$$^{18}$$\end{document}18O kinetic isotope effects (\documentclass[12pt]{minimal}
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\begin{document}$$^{18}$$\end{document}18O KIEs) in samples where \documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {O}_{2}$$\end{document}O2 is consumed and Ar:\documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {O}_{2}$$\end{document}O2 ratios increase steadily and substantially over the course of a reaction. We show that the extent of O isotope fractionation is overestimated only slightly and that this effect is typically smaller than uncertainties originating from the precision of \documentclass[12pt]{minimal}
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\begin{document}$$\updelta ^{18}$$\end{document}δ18O measurements and experimental variability. Ar interferences can become more relevant and bias \documentclass[12pt]{minimal}
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\begin{document}$$\upepsilon _{\mathrm {O}}$$\end{document}ϵO values by more than \documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {O}_{2}$$\end{document}O2 conversion exceeds 90%. Practically, however, such samples would typically contain less than 25 \documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {O}_{2}$$\end{document}O2 at ambient temperature, an amount that is close to the method detection limit of \documentclass[12pt]{minimal}
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\begin{document}$$^{16}$$\end{document}16O ratio measurement by CF-IRMS. Graphical abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1007/s00216-022-04184-3.
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3
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Kwon S, Deshlahra P, Iglesia E. Reactivity and selectivity descriptors of dioxygen activation routes on metal oxides. J Catal 2019. [DOI: 10.1016/j.jcat.2019.07.048] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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4
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Pasquini C, Zaharieva I, González-Flores D, Chernev P, Mohammadi MR, Guidoni L, Smith RDL, Dau H. H/D Isotope Effects Reveal Factors Controlling Catalytic Activity in Co-Based Oxides for Water Oxidation. J Am Chem Soc 2019; 141:2938-2948. [PMID: 30650965 DOI: 10.1021/jacs.8b10002] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Understanding the mechanism for electrochemical water oxidation is important for the development of more efficient catalysts for artificial photosynthesis. A basic step is the proton-coupled electron transfer, which enables accumulation of oxidizing equivalents without buildup of a charge. We find that substituting deuterium for hydrogen resulted in an 87% decrease in the catalytic activity for water oxidation on Co-based amorphous-oxide catalysts at neutral pH, while 16O-to-18O substitution lead to a 10% decrease. In situ visible and quasi-in situ X-ray absorption spectroscopy reveal that the hydrogen-to-deuterium isotopic substitution induces an equilibrium isotope effect that shifts the oxidation potentials positively by approximately 60 mV for the proton coupled CoII/III and CoIII/IV electron transfer processes. Time-resolved spectroelectrochemical measurements indicate the absence of a kinetic isotope effect, implying that the precatalytic proton-coupled electron transfer happens through a stepwise mechanism in which electron transfer is rate-determining. An observed correlation between Co oxidation states and catalytic current for both isotopic conditions indicates that the applied potential has no direct effect on the catalytic rate, which instead depends exponentially on the average Co oxidation state. These combined results provide evidence that neither proton nor electron transfer is involved in the catalytic rate-determining step. We propose a mechanism with an active species composed by two adjacent CoIV atoms and a rate-determining step that involves oxygen-oxygen bond formation and compare it with models proposed in the literature.
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Affiliation(s)
- Chiara Pasquini
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
| | - Ivelina Zaharieva
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
| | - Diego González-Flores
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
| | - Petko Chernev
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
| | - Mohammad Reza Mohammadi
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany.,Department of Physics , University of Sistan and Baluchestan , Zahedan , 98167-45845 , Iran
| | - Leonardo Guidoni
- Dipartimento di Scienze Fisiche e Chimiche , Università degli studi dell'Aquila,Via Vetoio (Coppito) , 67100 L'Aquila , Italy
| | - Rodney D L Smith
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany.,Department of Chemistry , University of Waterloo , 200 University Avenue W , N2L 3G1 Waterloo , ON , Canada
| | - Holger Dau
- Department of Physics , Freie Universität Berlin , Arnimallee 14 , 14195 Berlin , Germany
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5
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6
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Palluccio TD, Cai X, Majumdar S, Serafim LF, Tomson NC, Wieghardt K, Cazin CSJ, Nolan SP, Rybak-Akimova EV, Fernández-González MÁ, Temprado M, Captain B, Hoff CD. Ligand-Directed Reactivity in Dioxygen and Water Binding to cis-[Pd(NHC) 2(η 2-O 2)]. J Am Chem Soc 2018; 140:264-276. [PMID: 29172489 DOI: 10.1021/jacs.7b09905] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Reaction of [Pd(IPr)2] (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) and O2 leads to the surprising discovery that at low temperature the initial reaction product is a highly labile peroxide complex cis-[Pd(IPr)2(η2-O2)]. At temperatures ≳ -40 °C, cis-[Pd(IPr)2(η2-O2)] adds a second O2 to form trans-[Pd(IPr)2(η1-O2)2]. Squid magnetometry and EPR studies yield data that are consistent with a singlet diradical ground state with a thermally accessible triplet state for this unique bis-superoxide complex. In addition to reaction with O2, cis-[Pd(IPr)2(η2-O2)] reacts at low temperature with H2O in methanol/ether solution to form trans-[Pd(IPr)2(OH)(OOH)]. The crystal structure of trans-[Pd(IPr)2(OOH)(OH)] is reported. Neither reaction with O2 nor reaction with H2O occurs under comparable conditions for cis-[Pd(IMes)2(η2-O2)] (IMes = 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene). The increased reactivity of cis-[Pd(IPr)2(η2-O2)] is attributed to the enthalpy of binding of O2 to [Pd(IPr)2] (-14.5 ± 1.0 kcal/mol) that is approximately one-half that of [Pd(IMes)2] (-27.9 ± 1.5 kcal/mol). Computational studies identify the cause as interligand repulsion forcing a wider C-Pd-C angle and tilting of the NHC plane in cis-[Pd(IPr)2(η2-O2)]. Arene-arene interactions are more favorable and serve to further stabilize cis-[Pd(IMes)2(η2-O2)]. Inclusion of dispersion effects in DFT calculations leads to improved agreement between experimental and computational enthalpies of O2 binding. A complete reaction diagram is constructed for formation of trans-[Pd(IPr)2(η1-O2)2] and leads to the conclusion that kinetic factors inhibit formation of trans-[Pd(IMes)2(η1-O2)2] at the low temperatures at which it is thermodynamically favored. Failure to detect the predicted T-shaped intermediate trans-[Pd(NHC)2(η1-O2)] for either NHC = IMes or IPr is attributed to dynamic effects. A partial potential energy diagram for initial binding of O2 is constructed. A range of low-energy pathways at different angles of approach are present and blur the distinction between pure "side-on" or "end-on" trajectories for oxygen binding.
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Affiliation(s)
- Taryn D Palluccio
- Department of Chemistry, Tufts University , 62 Talbot Avenue, Medford, Massachusetts 02155, United States
| | - Xiaochen Cai
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Subhojit Majumdar
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Leonardo F Serafim
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Neil C Tomson
- Max-Planck Institute for Chemical Energy Conversion , Mülheim an der Ruhr, Germany.,Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
| | - Karl Wieghardt
- Max-Planck Institute for Chemical Energy Conversion , Mülheim an der Ruhr, Germany
| | - Catherine S J Cazin
- Department of Chemistry and Center for Sustainable Chemistry, Ghent University , Campus Sterre, Building S-3, Krijgslaan 281, Ghent 9000, Belgium
| | - Steven P Nolan
- Department of Chemistry and Center for Sustainable Chemistry, Ghent University , Campus Sterre, Building S-3, Krijgslaan 281, Ghent 9000, Belgium
| | - Elena V Rybak-Akimova
- Department of Chemistry, Tufts University , 62 Talbot Avenue, Medford, Massachusetts 02155, United States
| | - Miguel Ángel Fernández-González
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Universidad de Alcalá , Madrid 28871, Spain
| | - Manuel Temprado
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Universidad de Alcalá , Madrid 28871, Spain
| | - Burjor Captain
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Carl D Hoff
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
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7
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Ghogare AA, Debaz CJ, Silva Oliveira M, Abramova I, Mohapatra PP, Kwon K, Greer EM, Prado FM, Valerio HP, Di Mascio P, Greer A. Experimental and DFT Computational Insight into Nitrosamine Photochemistry—Oxygen Matters. J Phys Chem A 2017; 121:5954-5966. [DOI: 10.1021/acs.jpca.7b02414] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ashwini A. Ghogare
- Department
of Chemistry, Brooklyn College, 2900 Bedford Avenue, Brooklyn, New York 11210, United States
- Ph.D.
Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Ciro J. Debaz
- Department
of Chemistry, Brooklyn College, 2900 Bedford Avenue, Brooklyn, New York 11210, United States
| | - Marilene Silva Oliveira
- Department
of Chemistry, Brooklyn College, 2900 Bedford Avenue, Brooklyn, New York 11210, United States
- Departamento
de Bioquímica, Instituto de Química, Universidade de São Paulo, CEP, 05508-000 São Paulo, Brazil
| | - Inna Abramova
- Department
of Chemistry, Brooklyn College, 2900 Bedford Avenue, Brooklyn, New York 11210, United States
| | - Prabhu P. Mohapatra
- Department
of Chemistry, Brooklyn College, 2900 Bedford Avenue, Brooklyn, New York 11210, United States
| | - Kitae Kwon
- Department
of Natural Sciences, Baruch College, City University of New York, New York 10010, United States
| | - Edyta M. Greer
- Department
of Natural Sciences, Baruch College, City University of New York, New York 10010, United States
| | - Fernanda Manso Prado
- Departamento
de Bioquímica, Instituto de Química, Universidade de São Paulo, CEP, 05508-000 São Paulo, Brazil
| | - Hellen Paula Valerio
- Departamento
de Bioquímica, Instituto de Química, Universidade de São Paulo, CEP, 05508-000 São Paulo, Brazil
| | - Paolo Di Mascio
- Departamento
de Bioquímica, Instituto de Química, Universidade de São Paulo, CEP, 05508-000 São Paulo, Brazil
| | - Alexander Greer
- Department
of Chemistry, Brooklyn College, 2900 Bedford Avenue, Brooklyn, New York 11210, United States
- Ph.D.
Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
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Spahr S, Cirpka OA, von Gunten U, Hofstetter TB. Formation of N-Nitrosodimethylamine during Chloramination of Secondary and Tertiary Amines: Role of Molecular Oxygen and Radical Intermediates. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:280-290. [PMID: 27958701 DOI: 10.1021/acs.est.6b04780] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
N-Nitrosodimethylamine (NDMA) is a carcinogenic disinfection byproduct from water chloramination. Despite the identification of numerous NDMA precursors, essential parts of the reaction mechanism such as the incorporation of molecular O2 are poorly understood. In laboratory model systems for the chloramination of secondary and tertiary amines, we investigated the kinetics of precursor disappearance and NDMA formation, quantified the stoichiometries of monochloramine (NH2Cl) and aqueous O2 consumption, derived 18O-kinetic isotope effects (18O-KIE) for the reactions of aqueous O2, and studied the impact of radical scavengers on NDMA formation. Although the molar NDMA yields from five N,N-dimethylamine-containing precursors varied between 1.4% and 90%, we observed the stoichiometric removal of one O2 per N,N-dimethylamine group of the precursor indicating that the oxygenation of N atoms did not determine the molar NDMA yield. Small 18O-KIEs between 1.0026 ± 0.0003 and 1.0092 ± 0.0009 found for all precursors as well as completely inhibited NDMA formation in the presence of radical scavengers (ABTS and trolox) imply that O2 reacted with radical species. Our study suggests that aminyl radicals from the oxidation of organic amines by NH2Cl and N-peroxyl radicals from the reaction of aminyl radicals with aqueous O2 are part of the NDMA formation mechanism.
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Affiliation(s)
- Stephanie Spahr
- Eawag, Swiss Federal Institute of Aquatic Science and Technology , CH-8600 Dübendorf, Switzerland
- School of Architecture, Civil and Environmental Engineering (ENAC), Ecole Polytechnique Federale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland
| | - Olaf A Cirpka
- Center for Applied Geoscience, University of Tübingen , D-72074 Tübingen, Germany
| | - Urs von Gunten
- Eawag, Swiss Federal Institute of Aquatic Science and Technology , CH-8600 Dübendorf, Switzerland
- School of Architecture, Civil and Environmental Engineering (ENAC), Ecole Polytechnique Federale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland
- Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich , CH-8092 Zürich, Switzerland
| | - Thomas B Hofstetter
- Eawag, Swiss Federal Institute of Aquatic Science and Technology , CH-8600 Dübendorf, Switzerland
- Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich , CH-8092 Zürich, Switzerland
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9
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Zhang S, Liu H, Cheng P, Ren D, Gong X. Analysis of the [CuL n ]2+ and [CuG n ]2+ (n = 2–4) complex structures: Comparison with CID experiment and DFT calculation. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2016. [DOI: 10.1134/s0036024416130173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Peck SC, van der Donk WA. Go it alone: four-electron oxidations by mononuclear non-heme iron enzymes. J Biol Inorg Chem 2016; 22:381-394. [PMID: 27783267 DOI: 10.1007/s00775-016-1399-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2016] [Accepted: 10/11/2016] [Indexed: 10/20/2022]
Abstract
This review discusses the current mechanistic understanding of a group of mononuclear non-heme iron-dependent enzymes that catalyze four-electron oxidation of their organic substrates without the use of any cofactors or cosubstrates. One set of enzymes acts on α-ketoacid-containing substrates, coupling decarboxylation to oxygen activation. This group includes 4-hydroxyphenylpyruvate dioxygenase, 4-hydroxymandelate synthase, and CloR involved in clorobiocin biosynthesis. A second set of enzymes acts on substrates containing a thiol group that coordinates to the iron. This group is comprised of isopenicillin N synthase, thiol dioxygenases, and enzymes involved in the biosynthesis of ergothioneine and ovothiol. The final group of enzymes includes HEPD and MPnS that both carry out the oxidative cleavage of the carbon-carbon bond of 2-hydroxyethylphosphonate but generate different products. Commonalities amongst many of these enzymes are discussed and include the initial substrate oxidation by a ferric-superoxo-intermediate and a second oxidation by a ferryl species.
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Affiliation(s)
- Spencer C Peck
- Department of Chemistry and Howard Hughes Medical Institute, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave., Urbana, IL, 61801, USA.,Institute for Genomic Biology, University of Illinois at Urbana-Champaign, 1206 West Gregory Drive, Urbana, IL, 61801, USA
| | - Wilfred A van der Donk
- Department of Chemistry and Howard Hughes Medical Institute, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave., Urbana, IL, 61801, USA. .,Institute for Genomic Biology, University of Illinois at Urbana-Champaign, 1206 West Gregory Drive, Urbana, IL, 61801, USA.
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Abstract
Primary and secondary (18)O equilibrium isotope effects on the acidities of a variety of Brønsted and Lewis acids centered on carbon, boron, nitrogen, and phosphorus were computed by density-functional theory. For many of these acids, the secondary isotope effect was found to be larger than the primary isotope effect. This is a counterintuitive result, because the H atom that is lost is closer to the (18)O atom that is responsible for the primary isotope effect. The relative magnitudes of the isotope effects can be associated with the vibrational frequency and zero-point energy of the X═O vibrations, which are greater than those of the X-O vibrations. However, the difference between these contributions is small, and the major responsibility for the larger secondary isotope effect comes from the moment-of-inertia factor, which depends on the position of the (18)O atom relative to the principal axes of rotation.
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Affiliation(s)
- Charles L Perrin
- Department of Chemistry, University of California-San Diego, La Jolla, California 92093-0358, United States
| | - Kathryn D Burke
- Department of Chemistry, University of California-San Diego, La Jolla, California 92093-0358, United States
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12
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Cheah MH, Millar AH, Myers RC, Day DA, Roth J, Hillier W, Badger MR. Online oxygen kinetic isotope effects using membrane inlet mass spectrometry can differentiate between oxidases for mechanistic studies and calculation of their contributions to oxygen consumption in whole tissues. Anal Chem 2014; 86:5171-8. [PMID: 24786640 DOI: 10.1021/ac501086n] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The reduction chemistry of molecular oxygen underpins the energy metabolism of multicellular organisms, liberating free energy needed to catalyze a plethora of enzymatic reactions. Measuring the isotope signatures of (16)O and (18)O during O2 reduction can provide insights into both kinetic and equilibrium isotope effects. However, current methods to measure O2 isotope signatures are time-consuming and disruptive. This paper describes the application of membrane inlet mass spectrometry to determine the oxygen isotope discrimination of a range of O2-consuming reactions, providing a rapid and convenient method for determining these values. A survey of oxygenase and oxidase reactions provides new insights into previously uncharacterized amino acid oxidase enzymes. Liquid and gas phase measurements show the ease of assays using this approach for purified enzymes, biological extracts and intact tissues.
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Affiliation(s)
- Mun Hon Cheah
- Division of Plant Science, Research School of Biology, the Australian National University , Canberra ACT 0200, Australia
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13
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Angeles-Boza AM, Ertem MZ, Sarma R, Ibañez CH, Maji S, Llobet A, Cramer CJ, Roth JP. Competitive oxygen-18 kinetic isotope effects expose O–O bond formation in water oxidation catalysis by monomeric and dimeric ruthenium complexes. Chem Sci 2014. [DOI: 10.1039/c3sc51919h] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Competitive 18O KIEs on water oxidation catalysis provide a probe of transition states for O–O bond formation.
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Affiliation(s)
| | - Mehmed Z. Ertem
- Department of Chemistry and Supercomputing Center
- University of Minnesota
- Minneapolis, USA
| | - Rupam Sarma
- Department of Chemistry
- Johns Hopkins University
- Baltimore, USA
| | | | - Somnath Maji
- Institute of Chemical Research of Catalonia (ICIQ)
- 43007 Tarragona, Spain
| | - Antoni Llobet
- Institute of Chemical Research of Catalonia (ICIQ)
- 43007 Tarragona, Spain
| | - Christopher J. Cramer
- Department of Chemistry and Supercomputing Center
- University of Minnesota
- Minneapolis, USA
| | - Justine P. Roth
- Department of Chemistry
- Johns Hopkins University
- Baltimore, USA
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14
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Affiliation(s)
- Katarzyna Swiderek
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology , Zeromskiego 116, 90-924 Lodz, Poland
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15
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Liu Y, Mukherjee A, Nahumi N, Ozbil M, Brown D, Angeles-Boza AM, Dooley DM, Prabhakar R, Roth JP. Experimental and Computational Evidence of Metal-O2 Activation and Rate-Limiting Proton-Coupled Electron Transfer in a Copper Amine Oxidase. J Phys Chem B 2012; 117:218-29. [DOI: 10.1021/jp3121484] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Yi Liu
- Department of Chemistry, Johns Hopkins University, 3400 North
Charles Street, Baltimore, Maryland 21218, United States
| | - Arnab Mukherjee
- Department of Chemistry, Johns Hopkins University, 3400 North
Charles Street, Baltimore, Maryland 21218, United States
| | - Nadav Nahumi
- Department of Chemistry, Johns Hopkins University, 3400 North
Charles Street, Baltimore, Maryland 21218, United States
| | - Mehmet Ozbil
- Department of Chemistry, University of Miami, 1301 Memorial Drive,
Coral Gables, Florida 33146, United States
| | - Doreen Brown
- Department of Chemistry
and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Alfredo M. Angeles-Boza
- Department of Chemistry, Johns Hopkins University, 3400 North
Charles Street, Baltimore, Maryland 21218, United States
| | - David M. Dooley
- Department of Chemistry
and Biochemistry, Montana State University, Bozeman, Montana 59717, United States
| | - Rajeev Prabhakar
- Department of Chemistry, University of Miami, 1301 Memorial Drive,
Coral Gables, Florida 33146, United States
| | - Justine P. Roth
- Department of Chemistry, Johns Hopkins University, 3400 North
Charles Street, Baltimore, Maryland 21218, United States
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16
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Sarma R, Angeles-Boza AM, Brinkley DW, Roth JP. Studies of the Di-iron(VI) Intermediate in Ferrate-Dependent Oxygen Evolution from Water. J Am Chem Soc 2012; 134:15371-86. [DOI: 10.1021/ja304786s] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Rupam Sarma
- Department of Chemistry, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland
21218, United States
| | - Alfredo M. Angeles-Boza
- Department of Chemistry, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland
21218, United States
| | - David W. Brinkley
- Department of Chemistry, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland
21218, United States
| | - Justine P. Roth
- Department of Chemistry, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland
21218, United States
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17
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Angeles-Boza AM, Roth JP. Oxygen Kinetic Isotope Effects upon Catalytic Water Oxidation by a Monomeric Ruthenium Complex. Inorg Chem 2012; 51:4722-9. [DOI: 10.1021/ic202745n] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Alfredo M. Angeles-Boza
- Department
of Chemistry, Johns Hopkins University, 3400 North Charles Street,
Baltimore, Maryland 21218, United States
| | - Justine P. Roth
- Department
of Chemistry, Johns Hopkins University, 3400 North Charles Street,
Baltimore, Maryland 21218, United States
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18
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Huff GS, Doncheva IS, Brinkley DW, Angeles-Boza AM, Mukherjee A, Cramer CJ, Roth JP. Experimental and Computational Investigations of Oxygen Reactivity in a Heme and Tyrosyl Radical-Containing Fatty Acid α-(Di)oxygenase. Biochemistry 2011; 50:7375-89. [DOI: 10.1021/bi201016h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Gregory S. Huff
- Department of Chemistry, Johns Hopkins University, 3400 North Charles Street
Baltimore, Maryland 21218, United States
| | - Irina S. Doncheva
- Department of Chemistry, Johns Hopkins University, 3400 North Charles Street
Baltimore, Maryland 21218, United States
| | - David W. Brinkley
- Department of Chemistry, Johns Hopkins University, 3400 North Charles Street
Baltimore, Maryland 21218, United States
| | - Alfredo M. Angeles-Boza
- Department of Chemistry, Johns Hopkins University, 3400 North Charles Street
Baltimore, Maryland 21218, United States
| | - Arnab Mukherjee
- Department of Chemistry, Johns Hopkins University, 3400 North Charles Street
Baltimore, Maryland 21218, United States
| | - Christopher J. Cramer
- Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis,
Minnesota 55455, United States
| | - Justine P. Roth
- Department of Chemistry, Johns Hopkins University, 3400 North Charles Street
Baltimore, Maryland 21218, United States
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20
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Abstract
Kinetic isotope effects are exquisitely sensitive probes of transition structure. As such, kinetic isotope effects offer a uniquely useful probe for the symmetry-breaking process that is inherent to stereoselective reactions. In this Concept article, we explore the role of steric and electronic effects in stereocontrol, and we relate these concepts to recent studies carried out in our laboratory. We also explore the way in which kinetic isotope effects serve as useful points of contact with computational models of transition structures. Finally, we discuss future opportunities for kinetic isotope effects to play a role in asymmetric catalyst development.
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Affiliation(s)
- Thomas Giagou
- School of Natural Sciences, University of California Merced, 5200 N. Lake Rd., Merced, CA 95344 (USA)
| | - Matthew P. Meyer
- School of Natural Sciences, University of California Merced, 5200 N. Lake Rd., Merced, CA 95344 (USA)
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21
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Snir O, Wang Y, Tuckerman ME, Geletii YV, Weinstock IA. Concerted Proton−Electron Transfer to Dioxygen in Water. J Am Chem Soc 2010; 132:11678-91. [DOI: 10.1021/ja104392k] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Ophir Snir
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 84105, Israel, Department of Chemistry, Emory University, Atlanta, Georgia 30322, and Department of Chemistry and Courant Institute of Mathematical Sciences, New York University, New York, New York 10003
| | - Yifeng Wang
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 84105, Israel, Department of Chemistry, Emory University, Atlanta, Georgia 30322, and Department of Chemistry and Courant Institute of Mathematical Sciences, New York University, New York, New York 10003
| | - Mark E. Tuckerman
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 84105, Israel, Department of Chemistry, Emory University, Atlanta, Georgia 30322, and Department of Chemistry and Courant Institute of Mathematical Sciences, New York University, New York, New York 10003
| | - Yurii V. Geletii
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 84105, Israel, Department of Chemistry, Emory University, Atlanta, Georgia 30322, and Department of Chemistry and Courant Institute of Mathematical Sciences, New York University, New York, New York 10003
| | - Ira A. Weinstock
- Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 84105, Israel, Department of Chemistry, Emory University, Atlanta, Georgia 30322, and Department of Chemistry and Courant Institute of Mathematical Sciences, New York University, New York, New York 10003
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