201
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Huang MQ, Cai SY, Liao YM, Zhao WX, Hu CJ, Wang ZY, Zhang WJ. Theoretical Studies on Mechanism and Rate Constant of Gas Phase Hydrolysis of Glyoxal Catalyzed by Sulfuric Acid. CHINESE J CHEM PHYS 2016. [DOI: 10.1063/1674-0068/29/cjcp1509193] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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202
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Porada E, Szyszkowicz M. UNMIX Methods Applied to Characterize Sources of Volatile Organic Compounds in Toronto, Ontario. TOXICS 2016; 4:E11. [PMID: 29051416 PMCID: PMC5606629 DOI: 10.3390/toxics4020011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 05/17/2016] [Accepted: 06/07/2016] [Indexed: 11/30/2022]
Abstract
UNMIX, a sensor modeling routine from the U.S. Environmental Protection Agency (EPA), was used to model volatile organic compound (VOC) receptors in four urban sites in Toronto, Ontario. VOC ambient concentration data acquired in 2000-2009 for 175 VOC species in four air quality monitoring stations were analyzed. UNMIX, by performing multiple modeling attempts upon varying VOC menus-while rejecting the results that were not reliable-allowed for discriminating sources by their most consistent chemical characteristics. The method assessed occurrences of VOCs in sources typical of the urban environment (traffic, evaporative emissions of fuels, banks of fugitive inert gases), industrial point sources (plastic-, polymer-, and metalworking manufactures), and in secondary sources (releases from water, sediments, and contaminated urban soil). The remote sensing and robust modeling used here produces chemical profiles of putative VOC sources that, if combined with known environmental fates of VOCs, can be used to assign physical sources' shares of VOCs emissions into the atmosphere. This in turn provides a means of assessing the impact of environmental policies on one hand, and industrial activities on the other hand, on VOC air pollution.
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Affiliation(s)
- Eugeniusz Porada
- Department of Computer Science, University of Québec at Outaouais, Gatineau, QB J8X 3X7, Canada.
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203
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Křůmal K, Mikuška P, Večeřová K, Urban O, Pallozzi E, Večeřa Z. Wet effluent diffusion denuder: The tool for determination of monoterpenes in forest. Talanta 2016; 153:260-7. [DOI: 10.1016/j.talanta.2016.03.032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 03/08/2016] [Accepted: 03/10/2016] [Indexed: 01/10/2023]
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204
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Long B, Tan XF, Wang YB, Li J, Ren DS, Zhang WJ. Theoretical Studies on Reactions of OH with H2SO4…NH3Complex and NH2with H2SO4in the Presence of Water. ChemistrySelect 2016. [DOI: 10.1002/slct.201600194] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Bo Long
- College of Information Engineering; Guizhou Minzu University; Guiyang 550025 China
| | - Xing-Feng Tan
- College of Information Engineering; Guizhou Minzu University; Guiyang 550025 China
| | - Yi-Bo Wang
- Key Laboratory of Guizhou High Performance Computational Chemistry; Department of Chemistry; Guizhou University; Guiyang 550025 China
| | - Jun Li
- Department of Chemistry & Laboratory of Organic; Optoelectronics and Molecular Engineering of the Ministry of Education; Tsinghua University; Beijing 100084 China
| | - Da-Sen Ren
- College of Information Engineering; Guizhou Minzu University; Guiyang 550025 China
| | - Wei-Jun Zhang
- Laboratory of Atmospheric Physico-Chemistry; Anhui Institute of Optics and Fine Mechanics; Chinese Academy of Sciences; Hefei 230031 China
- Key Laboratory of Atmospheric Composition and Optical Radiation; Anhui Institute of Optics and Fine Mechanics; Chinese Academy of Sciences; Hefei 230031 China
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205
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McCarthy MC, Gauss J. Exotic SiO(2)H(2) Isomers: Theory and Experiment Working in Harmony. J Phys Chem Lett 2016; 7:1895-1900. [PMID: 27139016 DOI: 10.1021/acs.jpclett.6b00632] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Replacing carbon with silicon can result in dramatic and unanticipated changes in isomeric stability, as the well-studied CO2H2 and the essentially unknown SiO2H2 systems illustrate. Guided by coupled-cluster calculations, three SiO2H2 isomers have been detected and spectroscopically characterized in a molecular beam discharge source using rotational spectroscopy. The cis,trans conformer of dihydroxysilylene HOSiOH, the ground-state isomer, and the high-energy, metastable dioxasilirane c-H2SiO2 are abundantly produced in a dilute SiH4/O2 electrical discharge, enabling precise structural determinations of both by a combination of isotopic measurements and calculated vibrational corrections. The isotopic studies also provide insight into their formation route, suggesting that c-H2SiO2 is formed promptly in the expansion but that cis,trans-HOSiOH is likely formed by secondary reactions following formation of the most stable dissociation pair, SiO + H2O. Although less abundant, the rotational spectrum of trans-silanoic acid, the silicon analogue of formic acid, HSi(O)OH, has also been observed.
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Affiliation(s)
- Michael C McCarthy
- Harvard-Smithsonian Center for Astrophysics , Cambridge, Massachusetts 02138, United States
- School of Engineering & Applied Sciences, Harvard University , Cambridge, Massachusetts 02138, United States
| | - Jürgen Gauss
- Institut für Physikalische Chemie, Universität Mainz , Mainz 55128, Germany
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206
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Elsamra RMI, Jalan A, Buras ZJ, Middaugh JE, Green WH. Temperature- and Pressure-Dependent Kinetics of CH2OO + CH3COCH3and CH2OO + CH3CHO: Direct Measurements and Theoretical Analysis. INT J CHEM KINET 2016. [DOI: 10.1002/kin.21007] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Rehab M. I. Elsamra
- Department of Chemical Engineering; Massachusetts Institute of Technology; Cambridge MA 02139
- Department of Chemistry; Faculty of Science; Alexandria University; Ibrahimia 21321 Alexandria Egypt
| | - Amrit Jalan
- Department of Chemical Engineering; Massachusetts Institute of Technology; Cambridge MA 02139
| | - Zachary J. Buras
- Department of Chemical Engineering; Massachusetts Institute of Technology; Cambridge MA 02139
| | - Joshua E. Middaugh
- Department of Chemical Engineering; Massachusetts Institute of Technology; Cambridge MA 02139
| | - William H. Green
- Department of Chemical Engineering; Massachusetts Institute of Technology; Cambridge MA 02139
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207
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Nguyen TB, Tyndall GS, Crounse JD, Teng AP, Bates KH, Schwantes RH, Coggon MM, Zhang L, Feiner P, Milller DO, Skog KM, Rivera-Rios JC, Dorris M, Olson KF, Koss A, Wild RJ, Brown SS, Goldstein AH, de Gouw JA, Brune WH, Keutsch FN, Seinfeld JH, Wennberg PO. Atmospheric fates of Criegee intermediates in the ozonolysis of isoprene. Phys Chem Chem Phys 2016; 18:10241-54. [PMID: 27021601 DOI: 10.1039/c6cp00053c] [Citation(s) in RCA: 115] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We use a large laboratory, modeling, and field dataset to investigate the isoprene + O3 reaction, with the goal of better understanding the fates of the C1 and C4 Criegee intermediates in the atmosphere. Although ozonolysis can produce several distinct Criegee intermediates, the C1 stabilized Criegee (CH2OO, 61 ± 9%) is the only one observed to react bimolecularly. We suggest that the C4 Criegees have a low stabilization fraction and propose pathways for their decomposition. Both prompt and non-prompt reactions are important in the production of OH (28% ± 5%) and formaldehyde (81% ± 16%). The yields of unimolecular products (OH, formaldehyde, methacrolein (42 ± 6%) and methyl vinyl ketone (18 ± 6%)) are fairly insensitive to water, i.e., changes in yields in response to water vapor (≤4% absolute) are within the error of the analysis. We propose a comprehensive reaction mechanism that can be incorporated into atmospheric models, which reproduces laboratory data over a wide range of relative humidities. The mechanism proposes that CH2OO + H2O (k(H2O)∼ 1 × 10(-15) cm(3) molec(-1) s(-1)) yields 73% hydroxymethyl hydroperoxide (HMHP), 6% formaldehyde + H2O2, and 21% formic acid + H2O; and CH2OO + (H2O)2 (k(H2O)2∼ 1 × 10(-12) cm(3) molec(-1) s(-1)) yields 40% HMHP, 6% formaldehyde + H2O2, and 54% formic acid + H2O. Competitive rate determinations (kSO2/k(H2O)n=1,2∼ 2.2 (±0.3) × 10(4)) and field observations suggest that water vapor is a sink for greater than 98% of CH2OO in a Southeastern US forest, even during pollution episodes ([SO2] ∼ 10 ppb). The importance of the CH2OO + (H2O)n reaction is demonstrated by high HMHP mixing ratios observed over the forest canopy. We find that CH2OO does not substantially affect the lifetime of SO2 or HCOOH in the Southeast US, e.g., CH2OO + SO2 reaction is a minor contribution (<6%) to sulfate formation. Extrapolating, these results imply that sulfate production by stabilized Criegees is likely unimportant in regions dominated by the reactivity of ozone with isoprene. In contrast, hydroperoxide, organic acid, and formaldehyde formation from isoprene ozonolysis in those areas may be significant.
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Affiliation(s)
- Tran B Nguyen
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA.
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208
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Karton A. A computational chemist's guide to accurate thermochemistry for organic molecules. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2016. [DOI: 10.1002/wcms.1249] [Citation(s) in RCA: 134] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Amir Karton
- School of Chemistry and Biochemistry; The University of Western Australia; Perth WA Australia
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209
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Jørgensen S, Knap HC, Otkjær RV, Jensen AM, Kjeldsen MLH, Wennberg PO, Kjaergaard HG. Rapid Hydrogen Shift Scrambling in Hydroperoxy-Substituted Organic Peroxy Radicals. J Phys Chem A 2016; 120:266-75. [DOI: 10.1021/acs.jpca.5b06768] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Solvejg Jørgensen
- Department
of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
| | - Hasse C. Knap
- Department
of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
| | - Rasmus V. Otkjær
- Department
of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
| | - Annesofie M. Jensen
- Department
of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
| | - Mette L. H. Kjeldsen
- Department
of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
| | - Paul O. Wennberg
- Division
of Geological and Planetary Sciences and Division of Engineering and
Applied Science, California Institute of Technology, 1200 E. California
Blvd., Pasadena, California 91125, United States
| | - Henrik G. Kjaergaard
- Department
of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
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210
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Lin X, Ma Q, Yang C, Tang X, Zhao W, Hu C, Gu X, Fang B, Gai Y, Zhang W. Kinetics and mechanisms of gas phase reactions of hexenols with ozone. RSC Adv 2016. [DOI: 10.1039/c6ra17107a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The reactivity of hexenols, especially for the (E)-2-hexen-1-ol, with O3 shows a strong dependence on their chemical structure.
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211
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Dang J, He M. Mechanisms and kinetic parameters for the gas-phase reactions of anthracene and pyrene with Cl atoms in the presence of NOx. RSC Adv 2016. [DOI: 10.1039/c5ra25959b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The mechanisms of the Cl radical-initiated atmospheric oxidation of anthracene (Ant) and pyrene (Pyr) were investigated by using quantum chemistry calculations.
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Affiliation(s)
- Juan Dang
- Environment Research Institute
- Shandong University
- Jinan 250100
- P. R. China
| | - Maoxia He
- Environment Research Institute
- Shandong University
- Jinan 250100
- P. R. China
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212
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Lin LC, Chang HT, Chang CH, Chao W, Smith MC, Chang CH, Jr-Min Lin J, Takahashi K. Competition between H2O and (H2O)2 reactions with CH2OO/CH3CHOO. Phys Chem Chem Phys 2016; 18:4557-68. [DOI: 10.1039/c5cp06446e] [Citation(s) in RCA: 115] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We calculated the bimolecular rate coefficients for the CH2OO/CH3CHOO reactions with H2O/(H2O)2.
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Affiliation(s)
- Liang-Chun Lin
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
- Department of Chemistry
| | - Hung-Tzu Chang
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
| | - Chien-Hsun Chang
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
| | - Wen Chao
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
- Department of Chemistry
| | - Mica C. Smith
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
- Department of Chemistry
| | - Chun-Hung Chang
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
| | - Jim Jr-Min Lin
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
- Department of Chemistry
| | - Kaito Takahashi
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
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213
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Lin LC, Chao W, Chang CH, Takahashi K, Lin JJM. Temperature dependence of the reaction of anti-CH3CHOO with water vapor. Phys Chem Chem Phys 2016; 18:28189-28197. [DOI: 10.1039/c6cp05171e] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The kinetics of the reaction of anti-CH3CHOO with water vapor were investigated using transient UV absorption spectroscopy at temperatures from 288 to 328 K and 500 Torr.
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Affiliation(s)
- Liang-Chun Lin
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
- Department of Chemistry
| | - Wen Chao
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
- Department of Chemistry
| | - Chun-Hung Chang
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
| | - Kaito Takahashi
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
| | - Jim Jr-Min Lin
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
- Department of Chemistry
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214
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Wan W, Yu LJ, Karton A. Mechanistic Insights into Water-Catalyzed Formation of Levoglucosenone from Anhydrosugar Intermediates by Means of High-Level Theoretical Procedures. Aust J Chem 2016. [DOI: 10.1071/ch16206] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Levoglucosenone (LGO) is an important anhydrosugar product of fast pyrolysis of cellulose and biomass. We use the high-level G4(MP2) thermochemical protocol to study the reaction mechanism for the formation of LGO from the 1,4:3,6-dianhydro-α-d-glucopyranose (DGP) pyrolysis intermediate. We find that the DGP-to-LGO conversion proceeds via a multistep reaction mechanism, which involves ring-opening, ring-closing, enol-to-keto tautomerization, hydration, and dehydration reactions. The rate-determining step for the uncatalyzed process is the enol-to-keto tautomerization (ΔG‡298 = 68.6 kcal mol–1). We find that a water molecule can catalyze five of the seven steps in the reaction pathway. In the water-catalyzed process, the barrier for the enol-to-keto tautomerization is reduced by as much as 15.1 kcal mol–1, and the hydration step becomes the rate-determining step with an activation energy of ΔG‡298 = 58.1 kcal mol–1.
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215
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Launder AM, Agarwal J, Schaefer HF. Exploring mechanisms of a tropospheric archetype: CH3O2 + NO. J Chem Phys 2015; 143:234302. [PMID: 26696057 DOI: 10.1063/1.4937381] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Methylperoxy radical (CH3O2) and nitric oxide (NO) contribute to the propagation of photochemical smog in the troposphere via the production of methoxy radical (CH3O) and nitrogen dioxide (NO2). This reaction system also furnishes trace quantities of methyl nitrate (CH3ONO2), a sink for reactive NOx species. Here, the CH3O2 + NO reaction is examined with highly reliable coupled-cluster methods. Specifically, equilibrium geometries for the reactants, products, intermediates, and transition states of the ground-state potential energy surface are characterized. Relative reaction enthalpies at 0 K (ΔH0K) are reported; these values are comprised of electronic energies extrapolated to the complete basis set limit of CCSDT(Q) and zero-point vibrational energies computed at CCSD(T)/cc-pVTZ. A two-part mechanism involving CH3O and NO2 production followed by radical recombination to CH3ONO2 is determined to be the primary channel for formation of CH3ONO2 under tropospheric conditions. Constrained optimizations of the reaction paths at CCSD(T)/cc-pVTZ suggest that the homolytic bond dissociations involved in this reaction path are barrierless.
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Affiliation(s)
- Andrew M Launder
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Jay Agarwal
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Henry F Schaefer
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA
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216
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Miliordos E, Xantheas SS. The Origin of the Reactivity of the Criegee Intermediate: Implications for Atmospheric Particle Growth. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201509685] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Evangelos Miliordos
- Physical Sciences Division Pacific Northwest National Laboratory 902 Battelle Boulevard, P.O. Box 999, MS K1-83 Richland WA 99352 USA
| | - Sotiris S. Xantheas
- Physical Sciences Division Pacific Northwest National Laboratory 902 Battelle Boulevard, P.O. Box 999, MS K1-83 Richland WA 99352 USA
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217
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Miliordos E, Xantheas SS. The Origin of the Reactivity of the Criegee Intermediate: Implications for Atmospheric Particle Growth. Angew Chem Int Ed Engl 2015; 55:1015-9. [DOI: 10.1002/anie.201509685] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Indexed: 11/05/2022]
Affiliation(s)
- Evangelos Miliordos
- Physical Sciences Division Pacific Northwest National Laboratory 902 Battelle Boulevard, P.O. Box 999, MS K1-83 Richland WA 99352 USA
| | - Sotiris S. Xantheas
- Physical Sciences Division Pacific Northwest National Laboratory 902 Battelle Boulevard, P.O. Box 999, MS K1-83 Richland WA 99352 USA
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218
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Wei WM, Yang X, Zheng RH, Qin YD, Wu YK, Yang F. Theoretical studies on the reactions of the simplest Criegee intermediate CH2OO with CH3CHO. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.10.013] [Citation(s) in RCA: 9] [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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219
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Xie HB, Ma F, Wang Y, He N, Yu Q, Chen J. Quantum Chemical Study on ·Cl-Initiated Atmospheric Degradation of Monoethanolamine. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:13246-55. [PMID: 26495768 DOI: 10.1021/acs.est.5b03324] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Recent findings on the formation of ·Cl in continental urban areas necessitate the consideration of ·Cl initiated degradation when assessing the fate of volatile organic pollutants. Monoethanolamine (MEA) is considered as a potential atmospheric pollutant since it is a benchmark and widely utilized solvent in a leading CO2 capture technology. Especially, ·Cl may have specific interactions with the N atom of MEA, which could make the MEA + ·Cl reaction have different pathways and products from those of the MEA + ·OH reaction. Hence, ·Cl initiated reactions with MEA were investigated by a quantum chemical method [CCSD(T)/aug-cc-pVTZ//MP2/6-31+G(3df,2p)] and kinetics modeling. Results show that the overall rate constant for ·Cl initiated H-abstraction of MEA is 5 times faster than that initiated by ·OH, and the tropospheric lifetimes of MEA will be overestimated by 6-46% when assuming that [·Cl]/[·OH] = 1-10% if the role of ·Cl is ignored. The MEA + ·Cl reaction exclusively produces MEA-N that finally transforms into several products including mutagenic nitramine and carcinogenic nitrosamine via further reactions with O2/NOx, and the contribution of ·Cl to their formation is about 25-250% of that of ·OH. Thus, it is necessary to consider ·Cl initiated tropospheric degradation of MEA for its risk assessment.
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Affiliation(s)
- Hong-Bin Xie
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology , Dalian 116024, China
| | - Fangfang Ma
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology , Dalian 116024, China
| | - Yuanfang Wang
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology , Dalian 116024, China
| | - Ning He
- State Key Laboratory of Fine Chemicals, Dalian University of Technology , Dalian 116024, China
| | - Qi Yu
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology , Dalian 116024, China
| | - Jingwen Chen
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology , Dalian 116024, China
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220
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Nakajima M, Endo Y. Observation of hydroxymethyl hydroperoxide in a reaction system containing CH2OO and water vapor through pure rotational spectroscopy. J Chem Phys 2015; 143:164307. [DOI: 10.1063/1.4933433] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Affiliation(s)
- Masakazu Nakajima
- Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Yasuki Endo
- Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
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221
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Viegas LP, Varandas AJC. Role of (H2O)n (n = 2–3) Clusters on the HO2 + O3 Reaction: A Theoretical Study. J Phys Chem B 2015; 120:1560-8. [DOI: 10.1021/acs.jpcb.5b07691] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Luís P. Viegas
- Centro
de Química
and Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
| | - António J. C. Varandas
- Centro
de Química
and Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal
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222
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Li J, Guo H. Full-Dimensional Potential Energy Surface and Ro-vibrational Levels of Dioxirane. J Phys Chem A 2015; 120:2991-8. [DOI: 10.1021/acs.jpca.5b08491] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jun Li
- School
of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
- Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Hua Guo
- Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
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223
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Kuwata KT, Guinn EJ, Hermes MR, Fernandez JA, Mathison JM, Huang K. A Computational Re-examination of the Criegee Intermediate–Sulfur Dioxide Reaction. J Phys Chem A 2015; 119:10316-35. [DOI: 10.1021/acs.jpca.5b06565] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Keith T. Kuwata
- Department of Chemistry, Macalester College, Saint Paul, Minnesota 55105-1899, United States
| | - Emily J. Guinn
- Department of Chemistry, Macalester College, Saint Paul, Minnesota 55105-1899, United States
| | - Matthew R. Hermes
- Department of Chemistry, Macalester College, Saint Paul, Minnesota 55105-1899, United States
| | - Jenna A. Fernandez
- Department of Chemistry, Macalester College, Saint Paul, Minnesota 55105-1899, United States
| | - Jon M. Mathison
- Department of Chemistry, Macalester College, Saint Paul, Minnesota 55105-1899, United States
| | - Ke Huang
- Department of Chemistry, Macalester College, Saint Paul, Minnesota 55105-1899, United States
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224
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Yu HG, Ndengue S, Li J, Dawes R, Guo H. Vibrational energy levels of the simplest Criegee intermediate (CH2OO) from full-dimensional Lanczos, MCTDH, and MULTIMODE calculations. J Chem Phys 2015; 143:084311. [DOI: 10.1063/1.4929707] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Hua-Gen Yu
- Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Steve Ndengue
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
| | - Jun Li
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - Richard Dawes
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA
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225
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Säurevermittelte Bildung von Radikalen oder Baeyer-Villiger-Oxidation, ausgehend von Criegee-Addukten. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505648] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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226
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Acid‐Mediated Formation of Radicals or Baeyer–Villiger Oxidation from Criegee Adducts. Angew Chem Int Ed Engl 2015; 54:11848-51. [DOI: 10.1002/anie.201505648] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Indexed: 11/07/2022]
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227
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228
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Liu F, Fang Y, Kumar M, Thompson WH, Lester MI. Direct observation of vinyl hydroperoxide. Phys Chem Chem Phys 2015. [PMID: 26199999 DOI: 10.1039/c5cp02917a] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Many alkyl-substituted Criegee intermediates are predicted to undergo an intramolecular 1,4-hydrogen transfer to form isomeric vinyl hydroperoxide species (C[double bond, length as m-dash]COOH moiety), which break apart to release OH and vinoxy radicals. We report direct detection of stabilized vinyl hydroperoxides formed via carboxylic acid-catalyzed tautomerization of Criegee intermediates. A doubly hydrogen-bonded interaction between the Criegee intermediate and carboxylic acid facilitates efficient hydrogen transfer through a double hydrogen shift. Deuteration of formic or acetic acid permits migration of a D atom to yield partially deuterated vinyl hydroperoxides, which are distinguished from the CH3CHOO, (CH3)2COO, and CH3CH2CHOO Criegee intermediates by mass. Using 10.5 eV photoionization, three prototypical vinyl hydroperoxides, CH2[double bond, length as m-dash]CHOOD, CH2[double bond, length as m-dash]C(CH3)OOD, and CH3CH[double bond, length as m-dash]CHOOD, are detected directly. Complementary electronic structure calculations reveal several reaction pathways, including the barrierless acid-catalyzed tautomerization reaction predicted previously and a barrierless addition reaction that yields hydroperoxy alkyl formate.
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Affiliation(s)
- Fang Liu
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, USA.
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229
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Li H, Fang Y, Kidwell NM, Beames JM, Lester MI. UV Photodissociation Dynamics of the CH3CHOO Criegee Intermediate: Action Spectroscopy and Velocity Map Imaging of O-Atom Products. J Phys Chem A 2015; 119:8328-37. [DOI: 10.1021/acs.jpca.5b05352] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hongwei Li
- Department
of Chemistry, University of Pennsylvania, Philadelphia Pennsylvania 19104-6323, United States
| | - Yi Fang
- Department
of Chemistry, University of Pennsylvania, Philadelphia Pennsylvania 19104-6323, United States
| | - Nathanael M. Kidwell
- Department
of Chemistry, University of Pennsylvania, Philadelphia Pennsylvania 19104-6323, United States
| | - Joseph M. Beames
- Department
of Chemistry, University of Pennsylvania, Philadelphia Pennsylvania 19104-6323, United States
| | - Marsha I. Lester
- Department
of Chemistry, University of Pennsylvania, Philadelphia Pennsylvania 19104-6323, United States
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230
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Lee YP. Perspective: Spectroscopy and kinetics of small gaseous Criegee intermediates. J Chem Phys 2015; 143:020901. [DOI: 10.1063/1.4923165] [Citation(s) in RCA: 134] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Yuan-Pern Lee
- Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 30010, Taiwan and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
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231
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Hyttinen N, Kupiainen-Määttä O, Rissanen MP, Muuronen M, Ehn M, Kurtén T. Modeling the Charging of Highly Oxidized Cyclohexene Ozonolysis Products Using Nitrate-Based Chemical Ionization. J Phys Chem A 2015; 119:6339-45. [DOI: 10.1021/acs.jpca.5b01818] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Noora Hyttinen
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki FI-00014, Finland
| | - Oona Kupiainen-Määttä
- Department
of Physics, University of Helsinki, P.O. Box 64, Helsinki FI-00014, Finland
| | - Matti P. Rissanen
- Department
of Physics, University of Helsinki, P.O. Box 64, Helsinki FI-00014, Finland
| | - Mikko Muuronen
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki FI-00014, Finland
| | - Mikael Ehn
- Department
of Physics, University of Helsinki, P.O. Box 64, Helsinki FI-00014, Finland
| | - Theo Kurtén
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki FI-00014, Finland
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232
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Chapleski RC, Morris JR, Troya D. A theoretical study of the ozonolysis of C60: primary ozonide formation, dissociation, and multiple ozone additions. Phys Chem Chem Phys 2015; 16:5977-86. [PMID: 24549406 DOI: 10.1039/c3cp55212h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
We present an investigation of the reaction of ozone with C60 fullerene using electronic structure methods. Motivated by recent experiments of ozone exposure to a C60 film, we have characterized stationary points in the potential energy surface for the reactions of O3 with C60 that include both the formation of primary ozonide and subsequent dissociation reactions of this intermediate that lead to C-C bond cleavage. We have also investigated the addition of multiple O3 molecules to the C60 cage to explore potential reaction pathways under the high ozone flux conditions used in recent experiments. The lowest-energy product of the reaction of a single ozone molecule with C60 that results in C-C bond breakage corresponds to an open-cage C60O3 structure that contains ester and ketone moieties at the seam. This open-cage product is of much lower energy than the C60O + O2 products identified in prior work, and it is consistent with IR experimental spectra. Subsequent reaction of the open-cage C60O3 product with a second ozone molecule opens a low-energy reaction pathway that results in cage degradation via the loss of a CO2 molecule. Our calculations also reveal that, while full ozonation of all bonds between hexagons in C60 is unlikely even under high ozone concentration, the addition of a few ozone molecules to the C60 cage is favorable at room temperature.
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233
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Nguyen TL, Lee H, Matthews DA, McCarthy MC, Stanton JF. Stabilization of the Simplest Criegee Intermediate from the Reaction between Ozone and Ethylene: A High-Level Quantum Chemical and Kinetic Analysis of Ozonolysis. J Phys Chem A 2015; 119:5524-33. [DOI: 10.1021/acs.jpca.5b02088] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thanh Lam Nguyen
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Austin, Texas 78712-0165, United States
| | - Hyunwoo Lee
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Austin, Texas 78712-0165, United States
| | - Devin A. Matthews
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Austin, Texas 78712-0165, United States
| | - Michael C. McCarthy
- Harvard-Smithsonian
Center for Astrophysics, 60 Garden
Street, Cambridge, Massachusetts 02138, United States
| | - John F. Stanton
- Department
of Chemistry, The University of Texas at Austin, Mail Stop A5300, Austin, Texas 78712-0165, United States
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234
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Vereecken L, Glowacki DR, Pilling MJ. Theoretical Chemical Kinetics in Tropospheric Chemistry: Methodologies and Applications. Chem Rev 2015; 115:4063-114. [DOI: 10.1021/cr500488p] [Citation(s) in RCA: 146] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Luc Vereecken
- Max Planck Institute for Chemistry, 55128 Mainz, Germany
| | - David R. Glowacki
- PULSE
Institute and Department of Chemistry, Stanford University, Stanford, California 94305, United States
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
- School
of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
- Department
of Computer Science, University of Bristol, Bristol BS8 1UB, United Kingdom
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235
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236
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Maeda S, Taketsugu T, Ohno K, Morokuma K. From Roaming Atoms to Hopping Surfaces: Mapping Out Global Reaction Routes in Photochemistry. J Am Chem Soc 2015; 137:3433-45. [DOI: 10.1021/ja512394y] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Satoshi Maeda
- Department
of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Tetsuya Taketsugu
- Department
of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Koichi Ohno
- Graduate
School of Science, Tohoku University, Sendai 980-8578, Japan
- Institute for Quantum Chemical Exploration, Tokyo 108-0022, Japan
| | - Keiji Morokuma
- Fukui
Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
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237
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Womack CC, Martin-Drumel MA, Brown GG, Field RW, McCarthy MC. Observation of the simplest Criegee intermediate CH2OO in the gas-phase ozonolysis of ethylene. SCIENCE ADVANCES 2015; 1:e1400105. [PMID: 26601145 PMCID: PMC4643816 DOI: 10.1126/sciadv.1400105] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 02/06/2015] [Indexed: 06/05/2023]
Abstract
Ozonolysis is one of the dominant oxidation pathways for tropospheric alkenes. Although numerous studies have confirmed a 1,3-cycloaddition mechanism that generates a Criegee intermediate (CI) with form R1R2COO, no small CIs have ever been directly observed in the ozonolysis of alkenes because of their high reactivity. We present the first experimental detection of CH2OO in the gas-phase ozonolysis of ethylene, using Fourier transform microwave spectroscopy and a modified pulsed nozzle, which combines high reactant concentrations with rapid sampling and sensitive detection. Nine other product species of the O3 + C2H4 reaction were also detected, including formaldehyde, formic acid, dioxirane, and ethylene ozonide. The presence of all these species can be attributed to the unimolecular and bimolecular reactions of CH2OO, and their abundances are in qualitative agreement with published mechanisms and rate constants.
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Affiliation(s)
- Caroline C. Womack
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | | | - Gordon G. Brown
- Department of Science and Mathematics, Coker College, Hartsville, SC 29550, USA
| | - Robert W. Field
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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238
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Savee JD, Papajak E, Rotavera B, Huang H, Eskola AJ, Welz O, Sheps L, Taatjes CA, Zádor J, Osborn DL. Direct observation and kinetics of a hydroperoxyalkyl radical (QOOH). Science 2015; 347:643-6. [DOI: 10.1126/science.aaa1495] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Oxidation of organic compounds in combustion and in Earth’s troposphere is mediated by reactive species formed by the addition of molecular oxygen (O2) to organic radicals. Among the most crucial and elusive of these intermediates are hydroperoxyalkyl radicals, often denoted “QOOH.” These species and their reactions with O2 are responsible for the radical chain branching that sustains autoignition and are implicated in tropospheric autoxidation that can form low-volatility, highly oxygenated organic aerosol precursors. We report direct observation and kinetics measurements of a QOOH intermediate in the oxidation of 1,3-cycloheptadiene, a molecule that offers insight into both resonance-stabilized and nonstabilized radical intermediates. The results establish that resonance stabilization dramatically changes QOOH reactivity and, hence, that oxidation of unsaturated organics can produce exceptionally long-lived QOOH intermediates.
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239
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Kettner M, Karton A, McKinley A, Wild D. The CH3CHOO ‘Criegee intermediate’ and its anion: Isomers, infrared spectra, and W3-F12 energetics. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2014.12.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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240
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Rissanen MP, Kurtén T, Sipilä M, Thornton JA, Kausiala O, Garmash O, Kjaergaard HG, Petäjä T, Worsnop DR, Ehn M, Kulmala M. Effects of Chemical Complexity on the Autoxidation Mechanisms of Endocyclic Alkene Ozonolysis Products: From Methylcyclohexenes toward Understanding α-Pinene. J Phys Chem A 2015; 119:4633-50. [DOI: 10.1021/jp510966g] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Matti P. Rissanen
- Department of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland
| | - Theo Kurtén
- Department of Chemistry, University of Helsinki, P.O. Box 55, 00014 Helsinki, Finland
| | - Mikko Sipilä
- Department of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland
| | - Joel A. Thornton
- Department of Atmospheric
Sciences, University of Washington, Seattle, Washington 98195, United States
| | - Oskari Kausiala
- Department of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland
| | - Olga Garmash
- Department of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland
| | - Henrik G. Kjaergaard
- Department of Chemistry, University of Copenhagen, Universitetsparken
5, 2100 Copenhagen
Ø, Denmark
| | - Tuukka Petäjä
- Department of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland
| | - Douglas R. Worsnop
- Department of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland
- Department of Applied Physics, University of Eastern Finland, 70211 Kuopio, Finland
- Aerodyne Research Inc., 45 Manning Road, Billerica, Massachusetts 01821, United States
| | - Mikael Ehn
- Department of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland
| | - Markku Kulmala
- Department of Physics, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland
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241
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Vereecken L, Rickard AR, Newland MJ, Bloss WJ. Theoretical study of the reactions of Criegee intermediates with ozone, alkylhydroperoxides, and carbon monoxide. Phys Chem Chem Phys 2015; 17:23847-58. [DOI: 10.1039/c5cp03862f] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of Criegee intermediates with hydroperoxides yields exotic ether oxides, as well as oligomers.
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Affiliation(s)
| | - A. R. Rickard
- National Centre for Atmospheric Science (NCAS)
- University of York
- York
- UK
- Wolfson Atmospheric Chemistry Laboratories
| | - M. J. Newland
- School of Geography
- Earth and Environmental Sciences
- University of Birmingham
- Birmingham
- UK
| | - W. J. Bloss
- School of Geography
- Earth and Environmental Sciences
- University of Birmingham
- Birmingham
- UK
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242
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Kang L, Zhang C, Sun X. The mechanism and kinetic studies on oxidation reaction of acetofenate initiated by HO x, NO 3, O 3, and Cl radicals. RSC Adv 2015. [DOI: 10.1039/c5ra11453e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The chemical reaction of acetofenate (AF) in the atmosphere.
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Affiliation(s)
- Lingyan Kang
- Environment Research Institute
- Shandong University
- Jinan 250100
- P. R. China
| | - Chenxi Zhang
- Department of Resource and Environment
- Binzhou University
- Binzhou 256600
- PR China
| | - Xiaomin Sun
- Environment Research Institute
- Shandong University
- Jinan 250100
- P. R. China
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243
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Zhao Y, Wingen LM, Perraud V, Greaves J, Finlayson-Pitts BJ. Role of the reaction of stabilized Criegee intermediates with peroxy radicals in particle formation and growth in air. Phys Chem Chem Phys 2015; 17:12500-14. [DOI: 10.1039/c5cp01171j] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
We investigate the particle formation mechanism from ozonolysis, and find that it is highly dependent on the structure of the alkene.
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Affiliation(s)
- Yue Zhao
- Department of Chemistry
- University of California
- Irvine
- USA
| | - Lisa M. Wingen
- Department of Chemistry
- University of California
- Irvine
- USA
| | | | - John Greaves
- Department of Chemistry
- University of California
- Irvine
- USA
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244
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Liu F, Beames JM, Lester MI. Direct production of OH radicals upon CH overtone activation of (CH3)2COO Criegee intermediates. J Chem Phys 2014; 141:234312. [DOI: 10.1063/1.4903961] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Fang Liu
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA
| | - Joseph M. Beames
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA
| | - Marsha I. Lester
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA
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245
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Wang L, Zhang T, Wen J, He H, Zhang J. Theoretical study on dynamics of the gas phase reactions of CF 3 CF 2 CH 2 OCHF 2 with OH radicals. J Fluor Chem 2014. [DOI: 10.1016/j.jfluchem.2014.08.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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246
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Rissanen MP, Kurtén T, Sipilä M, Thornton JA, Kangasluoma J, Sarnela N, Junninen H, Jørgensen S, Schallhart S, Kajos MK, Taipale R, Springer M, Mentel TF, Ruuskanen T, Petäjä T, Worsnop DR, Kjaergaard HG, Ehn M. The formation of highly oxidized multifunctional products in the ozonolysis of cyclohexene. J Am Chem Soc 2014; 136:15596-606. [PMID: 25283472 DOI: 10.1021/ja507146s] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The prompt formation of highly oxidized organic compounds in the ozonolysis of cyclohexene (C6H10) was investigated by means of laboratory experiments together with quantum chemical calculations. The experiments were performed in borosilicate glass flow tube reactors coupled to a chemical ionization atmospheric pressure interface time-of-flight mass spectrometer with a nitrate ion (NO3(-))-based ionization scheme. Quantum chemical calculations were performed at the CCSD(T)-F12a/VDZ-F12//ωB97XD/aug-cc-pVTZ level, with kinetic modeling using multiconformer transition state theory, including Eckart tunneling corrections. The complementary investigation methods gave a consistent picture of a formation mechanism advancing by peroxy radical (RO2) isomerization through intramolecular hydrogen shift reactions, followed by sequential O2 addition steps, that is, RO2 autoxidation, on a time scale of seconds. Dimerization of the peroxy radicals by recombination and cross-combination reactions is in competition with the formation of highly oxidized monomer species and is observed to lead to peroxides, potentially diacyl peroxides. The molar yield of these highly oxidized products (having O/C > 1 in monomers and O/C > 0.55 in dimers) from cyclohexene ozonolysis was determined as (4.5 ± 3.8)%. Fully deuterated cyclohexene and cis-6-nonenal ozonolysis, as well as the influence of water addition to the system (either H2O or D2O), were also investigated in order to strengthen the arguments on the proposed mechanism. Deuterated cyclohexene ozonolysis resulted in a less oxidized product distribution with a lower yield of highly oxygenated products and cis-6-nonenal ozonolysis generated the same monomer product distribution, consistent with the proposed mechanism and in agreement with quantum chemical modeling.
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Affiliation(s)
- Matti P Rissanen
- Department of Physics, University of Helsinki , P.O. Box 64, Helsinki, 00014, Finland
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247
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Theoretical studies on kinetics, mechanism and thermochemistry of gas-phase reactions of CF3CHFCF2OCF3 with OH radicals and Cl atoms and fate of alkoxy radical at 298K. J Fluor Chem 2014. [DOI: 10.1016/j.jfluchem.2014.08.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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248
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Baptista L, Fernandes Francisco L, Dias JF, da Silva EC, Ferreira dos Santos CV, Gil de Mendonça FS, Arbilla G. Theoretical study of Δ-3-(+)-carene oxidation. Phys Chem Chem Phys 2014; 16:19376-85. [PMID: 25102281 DOI: 10.1039/c4cp02627f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, the rate-limiting steps of Δ(3)-carene oxidation by ozone and OH radicals were studied. The thermochemical and kinetic parameters were evaluated using the B3LYP, PBE1PBE and BHandHLYP functionals, coupled cluster methods and the 6-311G(d,p) and 6-311++G(d,p) basis sets. The attack on the double bond may occur in different orientations, leading to different oxidation products. The rate coefficients of each step of the reactions were evaluated using conventional canonical transition-state theory and variational canonical transition-state theory whenever necessary. The theoretical rate coefficient for the ozonolysis mechanism, evaluated at the CCSD(T)/6-31G(d,p)//PBE1PBE/6-311++G(d,p) level, was 2.08 × 10(-17) cm(3) molecule(-1) s(-1). The coefficient for the oxidation initialised by the OH radical, calculated at the BHandHLYP/6-311++G(d,p) level, was 5.06 × 10(-12) cm(3) molecule(-1) s(-1). These values are in reasonable agreement with the experimental results. The importance of these reactions in atmospheric chemistry is discussed.
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Affiliation(s)
- Leonardo Baptista
- Universidade do Estado do Rio de Janeiro, Faculdade de Tecnologia, Departamento de Química e Ambiental, Rodovia Presidente Dutra Km 298, Resende, RJ, Brazil.
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249
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Liu F, Beames JM, Petit AS, McCoy AB, Lester MI. Infrared-driven unimolecular reaction of CH3CHOO Criegee intermediates to OH radical products. Science 2014; 345:1596-8. [DOI: 10.1126/science.1257158] [Citation(s) in RCA: 104] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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250
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Mishra BK. Theoretical investigation on the atmospheric fate of CF3C(O)OCH 2O radical: alpha-ester rearrangement vs oxidation at 298 K. J Mol Model 2014; 20:2444. [PMID: 25208556 DOI: 10.1007/s00894-014-2444-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Accepted: 08/26/2014] [Indexed: 11/25/2022]
Abstract
A theoretical study on the mechanism of the thermal decomposition of CF(3)C(O)OCH(2)O radical is presented for the first time. Geometry optimization and frequency calculations were performed at the MPWB1K/6-31 + G(d, p) level of theory and energetic information further refined by calculating the energy of the species using G2(MP2) theory. Three plausible decomposition pathways including α-ester rearrangement, reaction with O(2) and thermal decomposition (C-O bond scission) were considered in detail. Our results reveal that reaction with O(2) is the dominant path for the decomposition of CF(3)C(O)OCH(2)O radical in the atmosphere, involving the lowest energy barrier, which is in accord with experimental findings. Our theoretical results also suggest that α-ester rearrangement leading to the formation of trifluoroacetic acid TFA makes a negligible contribution to decomposition of the title alkoxy radical. The thermal rate constants for the above decomposition pathways were evaluated using canonical transition state theory (CTST) at 298 K.
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Affiliation(s)
- Bhupesh Kumar Mishra
- Department of Chemical Sciences, Tezpur University Tezpur, Tezpur, Assam, 784 028, India,
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