1
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Shuman NS, Sweeny BC, Viggiano AA, Plane JMC, Feng W, Lachowicz A, Heaven MC, Ard SG. Kinetics of O 3 with Ca + and Its Higher Oxides CaO n+ ( n = 1-3) and Updates to a Model of Meteoric Calcium in the Mesosphere and Lower Thermosphere. J Phys Chem A 2023; 127:4043-4054. [PMID: 37115955 DOI: 10.1021/acs.jpca.3c01126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
The room-temperature rate constants and product branching fractions of CaOn+ (n = 0-3) + O3 are measured using a selected ion flow tube apparatus. Ca+ + O3 produces CaO+ + O2 with k = 9 ± 4 × 10-10 cm3 s-1, within uncertainty equal to the Langevin capture rate constant. This value is significantly larger than several literature values. Most likely, those values were underestimated due to the reformation of Ca+ from the sequential chemistry of higher calcium oxide cations with O3, as explored here. A rate constant of 8 ± 3 × 10-10 cm3 s-1 is recommended. Both CaO+ and CaO2+ react near the capture rate constant with ozone. The CaO+ reaction yields both CaO2+ + O2 (0.80 ± 0.15 branching) and Ca+ + 2O2. Similarly, the CaO2+ reaction yields both CaO3+ + O2 (0.85 ± 0.15 branching) and CaO+ + 2O2. CaO3+ + O3 yield CaO2+ + 2O2 at 2 ± 1 × 10-11 cm3 s-1, about 2% of the capture rate constant. The results are supported using density functional calculations and statistical modeling. In general, CaOn+ + O3 yield CaOn+1+ + O2, the expected oxidation. Some fraction of CaOn+1+ is produced with sufficient internal energy to further dissociate to CaOn-1+ + O2, yielding the same products as the oxidation of O3 by CaOn+. Mesospheric Ca and Ca+ concentrations are modeled as functions of day, latitude, and altitude using the Whole Atmosphere Community Climate Model (WACCM); incorporating the updated rate constants improves agreement with concentrations derived from lidar measurements.
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Affiliation(s)
- Nicholas S Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, United States
| | - Brendan C Sweeny
- Boston College Institute for Scientific Research, Boston, Massachusetts 02549, United States
| | - Albert A Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, United States
| | - John M C Plane
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | - Wuhu Feng
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
- National Centre for Atmospheric Science and School of Earth and Environment, University of Leeds, Leeds LS2 9JT, U.K
| | - Anton Lachowicz
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, United States
| | - Michael C Heaven
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Shaun G Ard
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, United States
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2
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Guo M, Zhou S, Sun X. Room-Temperature Conversion of Methane to Methanediol by [FeO 2] . J Phys Chem Lett 2023; 14:1633-1640. [PMID: 36752636 DOI: 10.1021/acs.jpclett.2c03786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Inspired by the activities of P-450 enzyme and Rieske oxygenases in nature, in which the high-valent Fe-oxo complexes play a key role for oxidation of alkanes, the oxidation process of methane by the high-valent iron oxide cation [FeO2]+ has been explored by using Fourier transform-ion cyclotron resonance (FT-ICR) mass spectrometry complemented by high-level quantum chemical calculations. In contrast to the previously reported [FeO]+/CH4 and [Fe(O)OH]+/CH4 systems, which afford [FeOH]+ as the main product, the generation of Fe+ dominates the reaction of [FeO2]+ with CH4. Theoretical calculations suggest a novel "oxygen rebound" pathway for the liberation of methanediol. In particular, the inevitable valence increase of Fe prior to C-H activation is similar to the cytochrome P-450 mediated processes. To our best knowledge, this study provides the first example of methane activation by the high-valent Fe(V)-oxo species in the gas phase, which may thus bridge the gas-phase model and the condensed-phase biosystems.
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Affiliation(s)
- Mengdi Guo
- Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
- Shandong Energy Institute, Qingdao 266101, China
| | - Shaodong Zhou
- College of Chemical and Biological Engineering, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Zhejiang University, Hangzhou 310027, China
- Institute of Zhejiang University─Quzhou, Zheda Road No. 99, Quzhou 324000, China
| | - Xiaoyan Sun
- Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
- Shandong Energy Institute, Qingdao 266101, China
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3
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Viggiano AA, Ard SG, Shuman NS. Temperature and energy dependences of ion-molecule reactions: Studies inspired by Diethard Böhme. MASS SPECTROMETRY REVIEWS 2022; 41:568-592. [PMID: 34159628 DOI: 10.1002/mas.21700] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 04/27/2021] [Accepted: 04/28/2021] [Indexed: 06/13/2023]
Abstract
Diethard Böhme has had a long career covering many topics in ion-molecule reactivity. In this review, we describe the work done at the Air Force Research Laboratory (and its variously named preceding organizations) that was inspired by his studies. These fall into two main areas: nucleophilic displacement (SN 2) and metal cation chemistry. In SN 2 chemistry, we revisited many of the reactions Diethard pioneered and studied them in more detail. We found nonstatistical behavior, both competition and noncompetition between multiple channels. New channels were found as hydration occurred, with more solution-like behavior occurring as only a few ligands were added. Temperature-dependent studies revealed details that were not observable at room temperature. These and other highlights will be discussed. In metal cation reactions, Diethard's use of an inductively coupled ion source allowed him to systematically study the periodic table of elements with a number of simple neutrals. We have taken the most interesting of these and studied them in greater detail. In doing so, we were able to identify curve crossing rates, in a few instances information about product states, and the importance of multiple entrance channels.
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Affiliation(s)
- Albert A Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico, USA
| | - Shaun G Ard
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico, USA
| | - Nicholas S Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico, USA
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4
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Sweeny BC, Long BA, Viggiano AA, Ard SG, Shuman NS. Effect of Intersystem Crossings on the Kinetics of Thermal Ion-Molecule Reactions: Ti + + O 2, CO 2, and N 2O. J Phys Chem A 2022; 126:859-869. [PMID: 35107288 DOI: 10.1021/acs.jpca.1c10196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A selected-ion flow tube apparatus has been used to measure rate constants and product branching fractions of 2Ti+ reacting with O2, CO2, and N2O over the range of 200-600 K. Ti+ + O2 proceeds at near the Langevin capture rate constant of 6-7 × 10-10 cm3 s-1 at all temperatures to yield 4TiO+ + O. Reactions initiated on doublet or quartet surfaces are formally spin-allowed; however, the 50% of reactions initiated on sextet surfaces must undergo an intersystem crossing (ISC). Statistical theory is used to calculate the energy and angular momentum dependences of the specific rate constants for the competing isomerization and dissociation channels. This acts as an internal clock on the lifetime to ISC, setting an upper limit on the order of τISC < 1e-11 s. 2Ti+ + CO2 produces 4TiO+ + CO less efficiently, with a rate constant fit as 5.5 ± 1.3 × 10-11 (T/300)-1.1 ± 0.2 cm3 s-1. The reaction is formally spin-prohibited, and statistical modeling shows that ISC, not a submerged transition state, is rate-limiting, occurring with a lifetime on the order of 10-7 s. Ti+ + N2O proceeds at near the capture rate constant. In this case, both Ti+ON2 and Ti+N2O entrance channel complexes are formed and can interconvert over a barrier. The main product is >90% TiO+ + N2, and the remainder is TiN+ + NO. Both channels need to undergo ISC to form ground-state products but TiO+ can be formed in an excited state exothermically. Therefore, kinetic information is obtained only for the TiN+ channel, where ISC occurs with a lifetime on the order of 10-9 s. Statistical modeling indicates that the dipole-preferred Ti+ON2 complex is formed in ∼80% of collisions, and this value is reproduced using a capture model based on the generic ion-dipole + quadrupole long-range potential.
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Affiliation(s)
- Brendan C Sweeny
- Institute for Scientific Research, Boston College, Boston, Massachusetts 02467, United States
| | - Bryan A Long
- NRC Postdoc at Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, United States
| | - Albert A Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, United States
| | - Shaun G Ard
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, United States
| | - Nicholas S Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, United States
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Ehrhard AA, Klein MP, Mohrbach J, Dillinger S, Niedner-Schatteburg G. Cryokinetics and spin quenching in the N2 adsorption onto rhodium cluster cations. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1953172] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Amelie A. Ehrhard
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany
| | - Matthias P. Klein
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany
| | - Jennifer Mohrbach
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany
| | - Sebastian Dillinger
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany
| | - Gereon Niedner-Schatteburg
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Kaiserslautern, Germany
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Ciborowski SM, Buszek R, Liu G, Blankenhorn M, Zhu Z, Marshall MA, Harris RM, Chiba T, Collins EL, Marquez S, Boatz JA, Chambreau SD, Vaghjiani GL, Bowen KH. Study of the Reaction of Hydroxylamine with Iridium Atomic and Cluster Anions ( n = 1-5). J Phys Chem A 2021; 125:5922-5932. [PMID: 34229436 DOI: 10.1021/acs.jpca.1c03935] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Elucidating the multifaceted processes of molecular activation and subsequent reactions gives a fundamental view into the development of iridium catalysts as they apply to fuels and propellants, for example, for spacecraft thrusters. Hydroxylamine, a component of the well-known hydroxylammonium nitrate (HAN) ionic liquid, is a safer alternative and mimics the chemistry and performance standards of hydrazine. The activation of hydroxylamine by anionic iridium clusters, Irn- (n = 1-5), depicts a part of the mechanism, where two hydrogen atoms are removed, likely as H2, and Irn(NOH)- clusters remain. The significant photoelectron spectral differences between these products and the bare clusters illustrate the substantial electronic changes imposed by the hydroxylamine fragment on the iridium clusters. In combination with DFT calculations, a preliminary reaction mechanism is proposed, identifying the possible intermediate steps leading to the formation of Ir(NOH)-.
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Affiliation(s)
- Sandra M Ciborowski
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Robert Buszek
- Jacobs Technology, Inc., Air Force Research Laboratory, AFRL/RQRP, Edwards Air Force Base, California 93524, United States
| | - Gaoxiang Liu
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Moritz Blankenhorn
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Zhaoguo Zhu
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Mary A Marshall
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | | | - Tatsuya Chiba
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Evan L Collins
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Sara Marquez
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Jerry A Boatz
- Propellants Branch, Rocket Propulsion Division, Aerospace Systems Directorate, Air Force Research Laboratory, AFRL/RQRP, Edwards Air Force Base, California 93524, United States
| | - Steven D Chambreau
- Jacobs Technology, Inc., Air Force Research Laboratory, AFRL/RQRP, Edwards Air Force Base, California 93524, United States
| | - Ghanshyam L Vaghjiani
- In-Space Propulsion Branch, Rocket Propulsion Division, Aerospace Systems Directorate, Air Force Research Laboratory, AFRL/RQRS, Edwards Air Force Base, California 93524, United States
| | - Kit H Bowen
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
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7
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Ard SG, Viggiano AA, Shuman NS. Old School Techniques with Modern Capabilities: Kinetics Determination of Dynamical Information Such as Barriers, Multiple Entrance Channel Complexes, Product States, Spin Crossings, and Size Effects in Metallic Ion–Molecule Reactions. J Phys Chem A 2021; 125:3503-3527. [DOI: 10.1021/acs.jpca.0c11395] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Shaun G. Ard
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, United States
| | - Albert A. Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, United States
| | - Nicholas S. Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, United States
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8
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Zhu X, Xu F, He Q, Xing Z, Zhang S, Zhang X. Detection of intermediates for diatomic [TaO]+ catalyzed gas-phase reaction of methane coupling to ethane and ethylene by ICP-MS/MS. Microchem J 2021. [DOI: 10.1016/j.microc.2020.105762] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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9
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Sweeny BC, McDonald DC, Poutsma JL, Poutsma JC, Shuman NS, Ard SG, Viggiano AA. Catalytic Oxidation of CO by N2O Enabled by Al2O2/3+: Temperature Dependent Kinetics and Statistical Modeling. J Phys Chem A 2020; 124:1705-1711. [DOI: 10.1021/acs.jpca.9b10732] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Brendan C. Sweeny
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, United States
| | - David C. McDonald
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, United States
| | - Jennifer L. Poutsma
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, Virginia 23529, United States
| | - John C. Poutsma
- Department of Chemistry and Biochemistry, The College of William and Mary, Williamsburg, Virginia 23185, United States
| | - Nicholas S. Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, United States
| | - Shaun G. Ard
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, United States
| | - Albert A. Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, United States
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10
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Sweeny BC, Pan H, Kassem A, Sawyer JC, Ard SG, Shuman NS, Viggiano AA, Brickel S, Unke OT, Upadhyay M, Meuwly M. Thermal activation of methane by MgO+: temperature dependent kinetics, reactive molecular dynamics simulations and statistical modeling. Phys Chem Chem Phys 2020; 22:8913-8923. [DOI: 10.1039/d0cp00668h] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The kinetics methane activation (MgO+ + CH4) was studied experimentally and computationally by running and analyzing reactive atomistic simulations.
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Affiliation(s)
- Brendan C. Sweeny
- NRC Postdoc at Air Force Research Laboratory
- Space Vehicles Directorate
- Kirtland Air Force Base
- USA
| | - Hanqing Pan
- USRA Space Scholar at Air Force Research Laboratory
- Space Vehicles Directorate
- Kirtland Air Force Base
- USA
| | - Asmaa Kassem
- USRA Space Scholar at Air Force Research Laboratory
- Space Vehicles Directorate
- Kirtland Air Force Base
- USA
| | - Jordan C. Sawyer
- NRC Postdoc at Air Force Research Laboratory
- Space Vehicles Directorate
- Kirtland Air Force Base
- USA
| | - Shaun G. Ard
- Air Force Research Laboratory
- Space Vehicles Directorate
- Kirtland Air Force Base
- USA
| | - Nicholas S. Shuman
- Air Force Research Laboratory
- Space Vehicles Directorate
- Kirtland Air Force Base
- USA
| | - Albert A. Viggiano
- Air Force Research Laboratory
- Space Vehicles Directorate
- Kirtland Air Force Base
- USA
| | | | - Oliver T. Unke
- Department of Chemistry
- University of Basel
- CH-4056 Basel
- Switzerland
| | - Meenu Upadhyay
- Department of Chemistry
- University of Basel
- CH-4056 Basel
- Switzerland
| | - Markus Meuwly
- Department of Chemistry
- University of Basel
- CH-4056 Basel
- Switzerland
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11
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Ard SG, Sweeny BC, McDonald DC, Viggiano AA, Shuman NS. Quantifying the Competition between Intersystem Crossing and Spin-Conserved Pathways in the Thermal Reaction of V+ + N2O. J Phys Chem A 2019; 124:30-38. [DOI: 10.1021/acs.jpca.9b09235] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shaun G. Ard
- Institute for Scientific Research, Boston College, Boston, Massachusetts 02467, United States
| | - Brendan C. Sweeny
- NRC Postdoc at Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, United States
| | - David C. McDonald
- NRC Postdoc at Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, United States
| | - Albert A. Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, Albuquerque, New Mexico 87117, United States
| | - Nicholas S. Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, Albuquerque, New Mexico 87117, United States
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12
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Hori Y, Abe T, Shiota Y, Yoshizawa K. Mechanistic Insights into Methane Oxidation by Molecular Oxygen under Photoirradiation: Controlled Radical Chain Reactions. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20190171] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yuta Hori
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, Fukuoka 819-0395, Japan
- Center for Computational Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - Tsukasa Abe
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, Fukuoka 819-0395, Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, Fukuoka 819-0395, Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering and IRCCS, Kyushu University, Fukuoka 819-0395, Japan
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13
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Mechanisms of sequential ion-molecule reactions in protonated methanol using mass spectrometry, ab initio methods, and statistical modeling. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2019.110420] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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14
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Lesniak L, Salas J, Burner J, Diedhiou M, Burgos Paci MA, Bodi A, Mayer PM. Trifluoroacetic Acid and Trifluoroacetic Anhydride Radical Cations Dissociate near the Ionization Limit. J Phys Chem A 2019; 123:6313-6318. [DOI: 10.1021/acs.jpca.9b04883] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lukas Lesniak
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa K1N 6N5, Canada
| | - Juana Salas
- INFIQC − CONICET, Departamento Fisicoquimica, Universidad Nacional de Córdoba, Cordoba 5000, Argentina
| | - Jake Burner
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa K1N 6N5, Canada
| | - Malick Diedhiou
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa K1N 6N5, Canada
| | - Maxi A Burgos Paci
- INFIQC − CONICET, Departamento Fisicoquimica, Universidad Nacional de Córdoba, Cordoba 5000, Argentina
| | - Andras Bodi
- Paul Scherrer Institute, Villigen, 5232 Switzerland
| | - Paul M Mayer
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa K1N 6N5, Canada
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15
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Sweeny BC, Ard SG, Viggiano AA, Shuman NS. Reaction of Mass-Selected, Thermalized VnOm+ Clusters with CCl4. J Phys Chem A 2019; 123:4817-4824. [DOI: 10.1021/acs.jpca.9b00479] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Brendan C. Sweeny
- NRC Postdoc at Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, United States
| | - Shaun G. Ard
- Institute for Scientific Research, Boston College, Boston, Massachusetts 02467, United States
| | - Albert A. Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, United States
| | - Nicholas S. Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, Albuquerque, New Mexico 87117, United States
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16
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Sweeny BC, Pan H, Ard SG, Shuman NS, Viggiano AA. On the Role of Hydrogen Atom Transfer (HAT) in Thermal Activation of Methane by MnO+: Entropy vs. Energy. ACTA ACUST UNITED AC 2019. [DOI: 10.1515/zpch-2018-1354] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Abstract
The temperature dependent kinetics and product branching fractions of first-row transition metal oxide cation MnO+ with CH4 and CD4 at temperatures between 200 and 600 K are measured using a selected-ion flow tube apparatus. Likely reaction mechanisms are determined by comparison of temperature dependent kinetics to statistical modeling along calculated reaction coordinates. The data is well-modeled with the reaction proceeding over a rate limiting four-centered transition state leading to an insertion intermediate, similar to reactions of NiO+ and FeO+, and showing characteristics of proton-coupled electron transfer (PCET). However, a more direct pathway traversing a transition state of hydrogen atom transfer (HAT) character to a hydroxyl intermediate is found to possibly be competitive, especially with increasing temperature. While uncertainties in calculated energetics limit quantitative assessment of the role of HAT at thermal energies, it is clear that this mechanism becomes increasingly prevalent in higher energy regimes.
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Affiliation(s)
- Brendan C. Sweeny
- NRC postdoc at Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base , New Mexico 87117 , USA
| | - Hanqing Pan
- USRA Space Scholar at Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base , New Mexico 87117 , USA
| | - Shaun G. Ard
- Institute for Scientific Research, Boston College , Boston, MA 02467 , USA
| | - Nicholas S. Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base , New Mexico 87117 , USA
| | - Albert A. Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base , New Mexico 87117 , USA
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17
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Selective Generation of Free Hydrogen Atoms in the Reaction of Methane with Diatomic Gold Boride Cations. ACTA ACUST UNITED AC 2019. [DOI: 10.1515/zpch-2018-1334] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Abstract
The thermal reaction of diatomic gold boride cation AuB+ with methane has been studied by using state-of-the-art mass spectrometry in conjunction with density functional theory calculations. The AuB+ ion can activate a methane molecule to produce exclusively the free hydrogen atom, an important intermediate in hydrocarbon transformation. This result is different from the reactivity of AuC+ and CuB+ counterparts with methane in previous studies. The AuC+ cation mainly transforms methane into ethylene. The CuB+ reaction system principally generates the free hydrogen atoms, but it also gives rise a portion of ethylene-like product H2B−CH2. The B atom of AuB+ is the active site to activate methane. The strong relativistic effect on gold plays an important role for the product selectivity. The mechanistic insights obtained from this study provide guidance for rational design of active sites with high product selectivity toward methane activation.
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18
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Sweeny BC, Ard SG, Shuman NS, Viggiano AA. The Role of Non‐Reactive Binding Sites in the AlVO
4
+
+CO/AlVO
3
+
+N
2
O Catalytic Cycle. Chemphyschem 2018; 19:2835-2838. [DOI: 10.1002/cphc.201800714] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Indexed: 01/02/2023]
Affiliation(s)
- Brendan C. Sweeny
- National Academy of Sciences Washington DC 20001
- Air Force Research Laboratory, Space Vehicles Directorate Kirtland Air Force Base New Mexico 87117
| | - Shaun G. Ard
- Institute for Scientific Research Boston College Boston MA 02467
- Air Force Research Laboratory, Space Vehicles Directorate Kirtland Air Force Base New Mexico 87117
| | - Nicholas S. Shuman
- Air Force Research Laboratory, Space Vehicles Directorate Kirtland Air Force Base New Mexico 87117
| | - Albert A. Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate Kirtland Air Force Base New Mexico 87117
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19
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McDonald DC, Sweeny BC, Ard SG, Melko JJ, Ruliffson JE, White MC, Viggiano AA, Shuman NS. Temperature and Isotope Dependent Kinetics of Nickel-Catalyzed Oxidation of Methane by Ozone. J Phys Chem A 2018; 122:6655-6662. [PMID: 29914263 DOI: 10.1021/acs.jpca.8b02513] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The temperature dependent kinetics of Ni+ + O3 and of NiO+ + CH4/CD4 are measured from 300 to 600 K using a selected-ion flow tube apparatus. Together, these reactions comprise a catalytic cycle converting CH4 to CH3OH. The reaction of Ni+ + O3 proceeds at the collisional limit, faster than previously reported at 300 K. The NiO+ product reacts further with O3, also at the collisional limit, yielding both higher oxides (up to NiO5+ is observed) as well as undergoing an apparent reduction back to Ni+. This apparent reduction channel is due to the oxidation channel yielding NiO2+* with sufficient energy to dissociate. 4NiO+ + CH4 (CD4) (whereas 4NiO+ refers to the quartet state of NiO+) proceeds with a rate constant of (2.6 ± 0.4) × 10-10 cm3 s-1 [(1.8 ± 0.5) × 10-10 cm3 s-1] at 300 K and a temperature dependence of ∼ T-0.7±0.3 (∼ T-1.1±0.4), producing only the 2Ni+ + 1CH3OH channel up to 600 K. Statistical modeling of the reaction based on calculated stationary points along the reaction coordinate reproduces the experimental rate constant as a function of temperature but underpredicts the kinetic isotope shift. The modeling was found to better represent the data when the crossing from quartet to doublet surface was incomplete, suggesting a possible kinetic effect in crossing from quartet to doublet surfaces. Additionally, the modeling predicts a competing 3NiOH+ + 2CH3 channel to become increasingly important at higher temperatures.
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Affiliation(s)
- David C McDonald
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base , New Mexico 87117 , United States
| | - Brendan C Sweeny
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base , New Mexico 87117 , United States
| | - Shaun G Ard
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base , New Mexico 87117 , United States
| | - Joshua J Melko
- Department of Chemistry , University of North Florida , Jacksonville , Florida 32224 , United States
| | - Jennifer E Ruliffson
- Department of Chemistry , University of North Florida , Jacksonville , Florida 32224 , United States
| | - Melanie C White
- Department of Chemistry , University of North Florida , Jacksonville , Florida 32224 , United States
| | - Albert A Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base , New Mexico 87117 , United States
| | - Nicholas S Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base , New Mexico 87117 , United States
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20
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Sun X, Zhou S, Yue L, Schlangen M, Schwarz H. On the Origin of the Distinctly Different Reactivity of Ruthenium in [MO]+
/CH4
Systems (M=Fe, Ru, Os). Angew Chem Int Ed Engl 2018. [DOI: 10.1002/anie.201800173] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Xiaoyan Sun
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Germany
| | - Shaodong Zhou
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Germany
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering; Zhejiang University; 310027 Hangzhou P.R. China
| | - Lei Yue
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Germany
| | - Maria Schlangen
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Germany
| | - Helmut Schwarz
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Germany
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21
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Sun X, Zhou S, Yue L, Schlangen M, Schwarz H. Über die Ursachen der deutlich unterschiedlichen Reaktivität von Ruthenium unter den [MO]+
/CH4
-Systemen (M=Fe, Ru, Os). Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201800173] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Xiaoyan Sun
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Deutschland
| | - Shaodong Zhou
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Deutschland
- Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering; Zhejiang University; 310027 Hangzhou V.R. China
| | - Lei Yue
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Deutschland
| | - Maria Schlangen
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Deutschland
| | - Helmut Schwarz
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Deutschland
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22
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Sweeny BC, Ard SG, Shuman NS, Viggiano AA. Kinetics of First-Row Transition Metal Cations (V+, Fe+, Co+) with OCS at Thermal Energies. J Phys Chem A 2018; 122:4246-4251. [DOI: 10.1021/acs.jpca.8b01841] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Brendan C. Sweeny
- Space Vehicles Directorate, Air Force Research Laboratory, Kirtland Air Force Base, New Mexico 87117, United States
| | - Shaun G. Ard
- Space Vehicles Directorate, Air Force Research Laboratory, Kirtland Air Force Base, New Mexico 87117, United States
| | - Nicholas S. Shuman
- Space Vehicles Directorate, Air Force Research Laboratory, Kirtland Air Force Base, New Mexico 87117, United States
| | - Albert A. Viggiano
- Space Vehicles Directorate, Air Force Research Laboratory, Kirtland Air Force Base, New Mexico 87117, United States
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23
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Takayanagi T, Nakatomi T. Automated reaction path searches for spin-forbidden reactions. J Comput Chem 2018; 39:1319-1326. [PMID: 29504140 DOI: 10.1002/jcc.25202] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 02/02/2018] [Accepted: 02/14/2018] [Indexed: 01/09/2023]
Abstract
Many catalytic and biomolecular reactions containing transition metals involve changes in the electronic spin state. These processes are referred to as "spin-forbidden" reactions within nonrelativistic quantum mechanics framework. To understand detailed reaction mechanisms of spin-forbidden reactions, one must characterize reaction pathways on potential energy surfaces with different spin states and then identify crossing points. Here we propose a practical computational scheme, where only the lowest mixed-spin eigenstate obtained from the diagonalization of the spin-coupled Hamiltonian matrix is used in reaction path search calculations. We applied this method to the 6,4 FeO+ + H2 → 6,4 Fe+ + H2 O, 6,4 FeO+ + CH4 → 6,4 Fe+ + CH3 OH, and 7 Mn+ + OCS → 5 MnS+ + CO reactions, for which crossings between the different spin states are known to play essential roles in the overall reaction kinetics. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Toshiyuki Takayanagi
- Department of Chemistry, Saitama University, Shimo-Okubo 255, Sakura-Ku, Saitama City, Saitama, 338-8570, Japan
| | - Taiki Nakatomi
- Department of Chemistry, Saitama University, Shimo-Okubo 255, Sakura-Ku, Saitama City, Saitama, 338-8570, Japan
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24
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Gani TZH, Kulik HJ. Unifying Exchange Sensitivity in Transition-Metal Spin-State Ordering and Catalysis through Bond Valence Metrics. J Chem Theory Comput 2017; 13:5443-5457. [DOI: 10.1021/acs.jctc.7b00848] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Terry Z. H. Gani
- Department
of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Heather J. Kulik
- Department
of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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25
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Sweeny BC, Ard SG, McDonald DC, Martinez O, Viggiano AA, Shuman NS. Discrepancy Between Experimental and Theoretical Predictions of the Adiabaticity of Ti
+
+CH
3
OH. Chemistry 2017; 23:11780-11783. [DOI: 10.1002/chem.201703002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Indexed: 01/12/2023]
Affiliation(s)
- Brendan C. Sweeny
- Air Force Research Laboratory Space Vehicles Directorate Kirtland Air Force Base NM 87117 USA
| | - Shaun G. Ard
- Air Force Research Laboratory Space Vehicles Directorate Kirtland Air Force Base NM 87117 USA
| | - David C. McDonald
- Air Force Research Laboratory Space Vehicles Directorate Kirtland Air Force Base NM 87117 USA
| | - Oscar Martinez
- Air Force Research Laboratory Space Vehicles Directorate Kirtland Air Force Base NM 87117 USA
| | - Albert A. Viggiano
- Air Force Research Laboratory Space Vehicles Directorate Kirtland Air Force Base NM 87117 USA
| | - Nicholas S. Shuman
- Air Force Research Laboratory Space Vehicles Directorate Kirtland Air Force Base NM 87117 USA
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26
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Ard SG, Shuman NS, Martinez O, Keyes NR, Viggiano AA, Guo H, Troe J. Temperature and Pressure Dependences of the Reactions of Fe + with Methyl Halides CH 3X (X = Cl, Br, I): Experiments and Kinetic Modeling Results. J Phys Chem A 2017; 121:4058-4068. [PMID: 28488864 DOI: 10.1021/acs.jpca.7b02415] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The pressure and temperature dependences of the reactions of Fe+ with methyl halides CH3X (X = Cl, Br, I) in He were measured in a selected ion flow tube over the ranges 0.4 to 1.2 Torr and 300-600 K. FeX+ was observed for all three halides and FeCH3+ was observed for the CH3I reaction. FeCH3X+ adducts (for all X) were detected in all reactions. The results were interpreted assuming two-state reactivity with spin-inversions between sextet and quartet potentials. Kinetic modeling allowed for a quantitative representation of the experiments and for extrapolation to conditions outside the experimentally accessible range. The modeling required quantum-chemical calculations of molecular parameters and detailed accounting of angular momentum effects. The results show that the FeX+ products come via an insertion mechanism, while the FeCH3+ can be produced from either insertion or SN2 mechanisms, but the latter we conclude is unlikely at thermal energies. A statistical modeling cannot reproduce the competition between the bimolecular pathways in the CH3I reaction, indicating that some more direct process must be important.
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Affiliation(s)
- Shaun G Ard
- Air Force Research Laboratory , Space Vehicle Directorate, Kirtland AFB, Albuquerque, New Mexico 87117, United States
| | - Nicholas S Shuman
- Air Force Research Laboratory , Space Vehicle Directorate, Kirtland AFB, Albuquerque, New Mexico 87117, United States
| | - Oscar Martinez
- Air Force Research Laboratory , Space Vehicle Directorate, Kirtland AFB, Albuquerque, New Mexico 87117, United States
| | - Nicholas R Keyes
- Department of Chemistry and Chemical Biology, University of New Mexico , Albuquerque, New Mexico 87131, United States
| | - Albert A Viggiano
- Air Force Research Laboratory , Space Vehicle Directorate, Kirtland AFB, Albuquerque, New Mexico 87117, United States
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico , Albuquerque, New Mexico 87131, United States
| | - Jürgen Troe
- Institut für Physikalische Chemie, Universität Göttingen , Tammannstrasse 6, D-37077 Göttingen, Germany.,Max-Planck-Institut für Biophysikalische Chemie , D-37077 Göttingen, Germany
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27
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Wang Y, Sun X, Zhang J, Li J. A Theoretical Study on Methane C—H Bond Activation by Bare [FeO]+/0/–. J Phys Chem A 2017; 121:3501-3514. [DOI: 10.1021/acs.jpca.6b13113] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Yang Wang
- Institute of Theoretical
Chemistry, Jilin University, Changchun 130023, People’s Republic of China
| | - Xiaoli Sun
- Institute of Theoretical
Chemistry, Jilin University, Changchun 130023, People’s Republic of China
| | - Jun Zhang
- Department
of Chemistry, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Jilai Li
- Institute of Theoretical
Chemistry, Jilin University, Changchun 130023, People’s Republic of China
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
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28
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Ard SG, Martinez O, Brown SA, Sawyer JC, Armentrout PB, Viggiano AA, Shuman NS. Reactivity of 4Fe +(CO) n=0-2 + O 2: oxidation of CO by O 2 at an isolated metal atom. Phys Chem Chem Phys 2017; 19:8768-8777. [PMID: 28275770 DOI: 10.1039/c6cp08703e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The kinetics of 4Fe+(CO)n=0-2 + O2 are measured under thermal conditions from 300-600 K using a selected-ion flow tube apparatus. Both the bare metal and n = 2 cations are inert to reaction over this temperature range, but 4Fe+(CO) reacts rapidly (k = 3.2 ± 0.8 × 10-10 cm3 s-1 at 300 K, 52% of the collisional rate coefficient) to form FeO+ + CO2. This is an example of the oxidation of CO by O2 occurring entirely on a single non-noble metal atom. The reaction of the bare metal reaction is known to be endothermic, such that this result is expected; however, the n = 2 reaction has highly exothermic product channels available, such that the lack of reaction is surprising in light of the n = 1 reactivity. Stationary points along all three reaction coordinates are calculated using the TPSSh hybrid functional. These surfaces show that the n = 1 reaction is an example of two-state reactivity; the reaction proceeds initially on the sextet surface over a submerged barrier to a structure with an O-O bond distance longer than that in O2, but must cross to the quartet surface in order to proceed over a second submerged barrier to rearrange to form CO2. The n = 2 reaction does not proceed because, on all spin surfaces, the transition state corresponding to O-O separation is at higher energy than the separated reactants. The difference between the n = 1 and n = 2 reactions is not a result of steric effects, but rather because the O2 is more strongly bound to Fe in the entrance well of the n = 1 case, and that energy is available to overcome the rate-limiting barrier to O-O cleavage. Experimental verification of some of these details are provided by guided ion beam tandem mass spectrometry results. The kinetic energy dependence of the n = 1 reaction shows evidence for a curve crossing and yields relevant thermochemistry for competing reaction channels.
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Affiliation(s)
- Shaun G Ard
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, NM 87117, USA.
| | - Oscar Martinez
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, NM 87117, USA.
| | - Steven A Brown
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, NM 87117, USA.
| | - Jordan C Sawyer
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, NM 87117, USA.
| | - P B Armentrout
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA
| | - Albert A Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, NM 87117, USA.
| | - Nicholas S Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, NM 87117, USA.
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29
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Melko JJ, Ard SG, Lê T, Miller GS, Martinez O, Shuman NS, Viggiano AA. Determining Rate Constants and Mechanisms for Sequential Reactions of Fe + with Ozone at 500 K. J Phys Chem A 2017; 121:24-30. [PMID: 27996263 DOI: 10.1021/acs.jpca.6b08971] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present rate constants and product branching ratios for the reactions of FeOx+ (x = 0-4) with ozone at 500 K. Fe+ is observed to react with ozone at the collision rate to produce FeO+ + O2. The FeO+ in turn reacts with ozone at the collision rate to yield both Fe+ and FeO2+ product channels. Ions up to FeO4+ display similar reactivity patterns. Three-body clustering reactions with O2 prevent us from measuring accurate rate constants at 300 K although the data do suggest that the efficiency is also high. Therefore, it is probable that little to no temperature dependence exists over this range. Implications of our measurements to the regulation of atmospheric iron and ozone are discussed. Density functional calculations on the reaction of Fe+ with ozone show no substantial kinetic barriers to make the FeO+ + O2 product channel, which is consistent with the reaction's efficiency. While a pathway to make FeO2+ + O is also found to be barrierless, our experiments indicate no primary FeO2+ formation for this reaction.
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Affiliation(s)
- Joshua J Melko
- Department of Chemistry, University of North Florida , 1 UNF Drive, Jacksonville, Florida 32224, United States
| | - Shaun G Ard
- Space Vehicles Directorate, Air Force Research Laboratory , Kirtland AFB, New Mexico 87117-5776, United States
| | - Trí Lê
- Department of Chemistry, University of North Florida , 1 UNF Drive, Jacksonville, Florida 32224, United States
| | - Gregory S Miller
- Department of Chemistry, University of North Florida , 1 UNF Drive, Jacksonville, Florida 32224, United States
| | - Oscar Martinez
- Space Vehicles Directorate, Air Force Research Laboratory , Kirtland AFB, New Mexico 87117-5776, United States
| | - Nicholas S Shuman
- Space Vehicles Directorate, Air Force Research Laboratory , Kirtland AFB, New Mexico 87117-5776, United States
| | - Albert A Viggiano
- Space Vehicles Directorate, Air Force Research Laboratory , Kirtland AFB, New Mexico 87117-5776, United States
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30
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Schwarz H. Ménage-à-trois: single-atom catalysis, mass spectrometry, and computational chemistry. Catal Sci Technol 2017. [DOI: 10.1039/c6cy02658c] [Citation(s) in RCA: 111] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Genuine, single-atom catalysis can be realized in the gas phase and probed by mass spectrometry combined with computational chemistry.
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Affiliation(s)
- Helmut Schwarz
- Institut für Chemie
- Technische Universität Berlin
- 10623 Berlin
- Germany
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31
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Li ZY, Li HF, Zhao YX, He SG. Gold(III) Mediated Activation and Transformation of Methane on Au1-Doped Vanadium Oxide Cluster Cations AuV2O6+. J Am Chem Soc 2016; 138:9437-43. [DOI: 10.1021/jacs.6b03940] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Zi-Yu Li
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, Institute of
Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Hai-Fang Li
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, Institute of
Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Yan-Xia Zhao
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, Institute of
Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Sheng-Gui He
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, Institute of
Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
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32
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Ard SG, Johnson RS, Martinez O, Shuman NS, Guo H, Troe J, Viggiano A. Analysis of the Pressure and Temperature Dependence of the Complex-Forming Bimolecular Reaction CH3OCH3 + Fe(.). J Phys Chem A 2016; 120:5264-73. [PMID: 27228310 DOI: 10.1021/acs.jpca.6b01125] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The kinetics of the reaction CH3OCH3 + Fe(+) has been studied between 250 and 600 K in the buffer gas He at pressures between 0.4 and 1.6 Torr. Total rate constants and branching ratios for the formation of Fe(+)O(CH3)2 adducts and of Fe(+)OCH2 + CH4 products were determined. Quantum-chemical calculations provided the parameters required for an analysis in terms of statistical unimolecular rate theory. The analysis employed a recently developed simplified representation of the rates of complex-forming bimolecular reactions, separating association and chemical activation contributions. Satisfactory agreement between experimental results and kinetic modeling was obtained that allows for an extrapolation of the data over wide ranges of conditions. Possible reaction pathways with or without spin-inversion are discussed in relation to the kinetic modeling results.
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Affiliation(s)
- Shaun G Ard
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117-57776, United States
| | - Ryan S Johnson
- Department of Chemistry and Chemical Biology, University of New Mexico , Albuquerque, New Mexico 87131, United States
| | - Oscar Martinez
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117-57776, United States
| | - Nicholas S Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117-57776, United States
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico , Albuquerque, New Mexico 87131, United States
| | - Jürgen Troe
- Max-Planck-Institut für Biophysikalische Chemie , Am Fassberg 11, D-37077 Göttingen, Germany.,Institut für Physikalische Chemie, Universität Göttingen , Tammannstrasse 6, D-37077 Göttingen, Germany
| | - Albert Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117-57776, United States
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33
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Ard SG, Shuman NS, Martinez O, Brown SA, Sawyer JC, Viggiano AA. Reactivity from excited state (4)FeO(+) + CO sampled through reaction of ground state (4)FeCO(+) + N2O. J Chem Phys 2016; 144:234303. [PMID: 27334158 DOI: 10.1063/1.4953553] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The kinetics of the FeCO(+) + N2O reaction have been studied at thermal energies (300-600 K) using a variable temperature selected ion flow tube apparatus. Rate constants and product branching fractions are reported. The reaction is modestly inefficient, proceeding with a rate constant of 6.2 × 10(-11) cm(3) s(-1) at 300 K, with a small negative temperature dependence, declining to 4.4 × 10(-11) cm(3) s(-1) at 600 K. Both Fe(+) and FeO(+) products are observed, with a constant branching ratio of approximately 40:60 at all temperatures. Calculation of the stationary points along the reaction coordinate shows that only the ground state quartet surface is initially sampled resulting in N2 elimination; a submerged barrier along this portion of the surface dictates the magnitude and temperature dependence of the total rate constant. The product branching fractions are determined by the behavior of the remaining (4)OFeCO(+) fragment, and this behavior is compared to that found in the reaction of FeO(+) + CO, which initially forms (6)OFeCO(+). Thermodynamic and kinetic arguments are used to show that the spin-forbidden surface crossing in this region is efficient, proceeding with an average rate constant of greater than 10(12) s(-1).
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Affiliation(s)
- Shaun G Ard
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, USA
| | - Nicholas S Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, USA
| | - Oscar Martinez
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, USA
| | - Steven A Brown
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, USA
| | - Jordan C Sawyer
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, USA
| | - Albert A Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland Air Force Base, New Mexico 87117, USA
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34
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Melko JJ, Ard SG, Shuman NS, Pedder RE, Taormina CR, Viggiano AA. Coupling an electrospray source and a solids probe/chemical ionization source to a selected ion flow tube apparatus. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2015; 86:084101. [PMID: 26329209 DOI: 10.1063/1.4927716] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A new ion source region has been constructed and attached to a variable temperature selected ion flow tube. The source features the capabilities of electron impact, chemical ionization, a solids probe, and electrospray ionization. The performance of the instrument is demonstrated through a series of reactions from ions created in each of the new source regions. The chemical ionization source is able to create H3O(+), but not as efficiently as similar sources with larger apertures. The ability of this source to support a solids probe, however, greatly expands our capabilities. A variety of rhenium cations and dications are created from the solids probe in sufficient abundance to study in the flow tube. The reaction of Re(+) with O2 proceeds with a rate constant that agrees with the literature measurements, while the reaction of Re2(2+) is found to charge transfer with O2 at about 60% of the collision rate; we have also performed calculations that support the charge transfer pathway. The electrospray source is used to create Ba(+), which is reacted with N2O to create BaO(+), and we find a rate constant that agrees with the literature.
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Affiliation(s)
- Joshua J Melko
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, New Mexico 87117-5776, USA
| | - Shaun G Ard
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, New Mexico 87117-5776, USA
| | - Nicholas S Shuman
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, New Mexico 87117-5776, USA
| | - Randall E Pedder
- Ardara Technologies L.P., 12941 Route 993, Ardara, Pennsylvania 15615, USA
| | | | - Albert A Viggiano
- Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, New Mexico 87117-5776, USA
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Wang LN, Zhou ZX, Li XN, Ma TM, He SG. Thermal Conversion of Methane to Formaldehyde Promoted by Gold in AuNbO3+Cluster Cations. Chemistry 2015; 21:6957-61. [DOI: 10.1002/chem.201406497] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Indexed: 11/11/2022]
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Mai BK, Kim Y. The Kinetic Isotope Effect as a Probe of Spin Crossover in the CH Activation of Methane by the FeO+Cation. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201411309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Mai BK, Kim Y. The Kinetic Isotope Effect as a Probe of Spin Crossover in the CH Activation of Methane by the FeO+Cation. Angew Chem Int Ed Engl 2015; 54:3946-51. [DOI: 10.1002/anie.201411309] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 01/08/2015] [Indexed: 11/09/2022]
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Ushakov VG, Troe J, Johnson RS, Guo H, Ard SG, Melko JJ, Shuman NS, Viggiano AA. Statistical modeling of the reactions Fe+ + N2O → FeO+ + N2 and FeO+ + CO → Fe+ + CO2. Phys Chem Chem Phys 2015; 17:19700-8. [DOI: 10.1039/c5cp01416f] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The rates of the reactions Fe+ + N2O → FeO+ + N2 and FeO+ + CO → Fe+ + CO2 are modeled by statistical rate theory accounting for energy- and angular momentum-specific rate constants for formation of the primary and secondary cationic adducts and their backward and forward reactions.
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Affiliation(s)
- Vladimir G. Ushakov
- Max-Planck-Institut für Biophysikalische Chemie
- D-37077 Göttingen
- Germany
- Institute of Problems of Chemical Physics
- Russian Academy of Sciences
| | - Jürgen Troe
- Max-Planck-Institut für Biophysikalische Chemie
- D-37077 Göttingen
- Germany
- Institut für Physikalische Chemie
- Universität Göttingen
| | - Ryan S. Johnson
- Department of Chemistry and Chemical Biology
- University of New Mexico
- Albuquerque
- USA
| | - Hua Guo
- Department of Chemistry and Chemical Biology
- University of New Mexico
- Albuquerque
- USA
| | - Shaun G. Ard
- Air Force Research Laboratory
- Space Vehicle Directorate
- Kirtland AFB
- USA
| | - Joshua J. Melko
- Air Force Research Laboratory
- Space Vehicle Directorate
- Kirtland AFB
- USA
- Department of Chemistry
| | | | - Albert A. Viggiano
- Department of Chemistry and Chemical Biology
- University of New Mexico
- Albuquerque
- USA
- Air Force Research Laboratory
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39
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Ard SG, Melko JJ, Martinez O, Ushakov VG, Li A, Johnson RS, Shuman NS, Guo H, Troe J, Viggiano AA. Further Insight into the Reaction FeO+ + H2 → Fe+ + H2O: Temperature Dependent Kinetics, Isotope Effects, and Statistical Modeling. J Phys Chem A 2014; 118:6789-97. [DOI: 10.1021/jp5055815] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Shaun G. Ard
- Air Force Research
Laboratory, Space Vehicles Directorate, Kirtland AFB, Albuquerque, New Mexico 87117-5776, United States
| | - Joshua J. Melko
- Air Force Research
Laboratory, Space Vehicles Directorate, Kirtland AFB, Albuquerque, New Mexico 87117-5776, United States
- Department
of Chemistry, University of North Florida, Jacksonville, Florida 32224, United States
| | - Oscar Martinez
- Air Force Research
Laboratory, Space Vehicles Directorate, Kirtland AFB, Albuquerque, New Mexico 87117-5776, United States
| | - Vladimir G. Ushakov
- Institute of Problems
of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
- Max-Planck-Institut für Biophysikalische Chemie, Am Fassberg 11, D-37077 Göttingen, Germany
| | - Anyang Li
- Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Ryan S. Johnson
- Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Nicholas S. Shuman
- Air Force Research
Laboratory, Space Vehicles Directorate, Kirtland AFB, Albuquerque, New Mexico 87117-5776, United States
| | - Hua Guo
- Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Jürgen Troe
- Max-Planck-Institut für Biophysikalische Chemie, Am Fassberg 11, D-37077 Göttingen, Germany
- Institut
für Physikalische Chemie, Universität Göttingen, Tammannstrasse
6, D-37077 Göttingen, Germany
| | - Albert A. Viggiano
- Air Force Research
Laboratory, Space Vehicles Directorate, Kirtland AFB, Albuquerque, New Mexico 87117-5776, United States
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Schwarz H. How and Why Do Cluster Size, Charge State, and Ligands Affect the Course of Metal-Mediated Gas-Phase Activation of Methane? Isr J Chem 2014. [DOI: 10.1002/ijch.201300134] [Citation(s) in RCA: 168] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Zhao YX, Li ZY, Yuan Z, Li XN, He SG. Thermal Methane Conversion to Formaldehyde Promoted by Single Platinum Atoms in PtAl2O4−Cluster Anions. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403953] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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42
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Zhao YX, Li ZY, Yuan Z, Li XN, He SG. Thermal Methane Conversion to Formaldehyde Promoted by Single Platinum Atoms in PtAl2O4−Cluster Anions. Angew Chem Int Ed Engl 2014; 53:9482-6. [DOI: 10.1002/anie.201403953] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 05/21/2014] [Indexed: 01/05/2023]
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