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Espinosa S, Asensio M, Antiñolo M, Albaladejo J, Jiménez E. Atmospheric chemistry of CF 3CHFCF 2OCH 3 (HFE-356mec3) and CHF 2CHFOCF 3 (HFE-236ea1) initiated by OH and Cl and their contribution to global warming. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:50347-50358. [PMID: 39095632 DOI: 10.1007/s11356-024-34374-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Accepted: 07/09/2024] [Indexed: 08/04/2024]
Abstract
The kinetic study of the gas-phase reactions of hydroxyl (OH) radicals and chlorine (Cl) atoms with CF3CHFCF2OCH3 (HFE-356mec3) and CHF2CHFOCF3 (HFE-236ea1) was performed by the pulsed laser photolysis/laser-induced fluorescence technique and a relative method by using Fourier Transform infrared (FTIR) spectroscopy as detection technique. The temperature dependences of the OH-rate coefficients (kOH(T) in cm3s-1) between 263 and 353 K are well described by the following expressions: 9.93 × 10-13exp{-(988 ± 35)/T}for HFE-356mec3 and 4.75 × 10-13exp{-(1285 ± 22)/T} for HFE-236ea1. Under NOx-free conditions, the rate coefficients kCl at 298 K and 1013 mbar (760 Torr) of air were determined to be (2.30 ± 1.08) × 10-13 cm3s-1and (1.19 ± 0.10) × 10-15 cm3s-1, for HFE-356mec3 and HFE-236ea1, respectively. Additionally, the relative kinetic study of the Cl + CH2ClCHCl2 reaction was investigated at 298 K, as it was used as a reference reaction in the kinetic study of the Cl-reaction with HFE-356mec3 and discrepant rate coefficients were found in the literature. The global atmospheric lifetimes were estimated relative to CH3CCl3 at the tropospheric mean temperature (272 K) as 1.4 and 8.6 years for HFE-356mec3 and HFE-236ea1, respectively. These values combined with the radiative efficiencies for HFE-356mec3 and HFE-236ea1 derived from the measured IR absorption cross sections (0.27 and 0.41 W m-2 ppv-1) yield global warming potentials at a 100-yrs time horizon of 143 and 1473, respectively. The contribution of HFE-356mec3 and HFE-236ea1 to global warming of the atmosphere would be large if they become widespread increasing their atmospheric concentration.
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Affiliation(s)
- Sara Espinosa
- Facultad de Ciencias y Tecnologías Químicas, Departamento de Química Física, Universidad de Castilla-La Mancha (UCLM), Avda. Camilo José Cela, 1B, 13071, Ciudad Real, Spain
- Instituto de Investigación en Combustión y Contaminación Atmosférica (ICCA), Universidad de Castilla-La Mancha (UCLM), Camino de Moledores, S/N, 13071, Ciudad Real, Spain
| | - María Asensio
- Facultad de Ciencias y Tecnologías Químicas, Departamento de Química Física, Universidad de Castilla-La Mancha (UCLM), Avda. Camilo José Cela, 1B, 13071, Ciudad Real, Spain
- Instituto de Investigación en Combustión y Contaminación Atmosférica (ICCA), Universidad de Castilla-La Mancha (UCLM), Camino de Moledores, S/N, 13071, Ciudad Real, Spain
| | - María Antiñolo
- Facultad de Ciencias y Tecnologías Químicas, Departamento de Química Física, Universidad de Castilla-La Mancha (UCLM), Avda. Camilo José Cela, 1B, 13071, Ciudad Real, Spain
- Instituto de Investigación en Combustión y Contaminación Atmosférica (ICCA), Universidad de Castilla-La Mancha (UCLM), Camino de Moledores, S/N, 13071, Ciudad Real, Spain
| | - José Albaladejo
- Facultad de Ciencias y Tecnologías Químicas, Departamento de Química Física, Universidad de Castilla-La Mancha (UCLM), Avda. Camilo José Cela, 1B, 13071, Ciudad Real, Spain
- Instituto de Investigación en Combustión y Contaminación Atmosférica (ICCA), Universidad de Castilla-La Mancha (UCLM), Camino de Moledores, S/N, 13071, Ciudad Real, Spain
| | - Elena Jiménez
- Facultad de Ciencias y Tecnologías Químicas, Departamento de Química Física, Universidad de Castilla-La Mancha (UCLM), Avda. Camilo José Cela, 1B, 13071, Ciudad Real, Spain.
- Instituto de Investigación en Combustión y Contaminación Atmosférica (ICCA), Universidad de Castilla-La Mancha (UCLM), Camino de Moledores, S/N, 13071, Ciudad Real, Spain.
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Arathala P, Musah RA. Thermochemistry and Kinetics of the Atmospheric Oxidation Reactions of Propanesulfinyl Chloride Initiated by OH Radicals: A Computational Approach. J Phys Chem A 2022; 126:4264-4276. [PMID: 35758544 DOI: 10.1021/acs.jpca.2c01203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The thermochemistry and kinetics of the atmospheric oxidation mechanism for propanesulfinyl chloride (CH3-CH2-CH2-S(═O)Cl; PSICl) initiated by the hydroxyl (OH) radical were investigated with high level quantum chemistry calculations and the Master equation solver for multi-energy well reaction (Mesmer) kinetic code. The mechanism for the oxidation of PSICl in the presence of OH radical can proceed via H-abstraction and substitution pathways. The CCSD(T)/aug-cc-pV(T+d)Z//MP2/aug-cc-pV(T+d)Z level calculated energies revealed addition of the OH radical to the S-atom of the sulfinyl (-S(═O)) moiety, followed by cleavage of the Cl-S(═O) single bond, leading to formation of propanesulfinic acid (PSIA) and the Cl radical to be the major pathway when compared to all other possible channels. The transition state barrier height for this reaction was found to be -3.0 kcal mol-1 relative to the energy of the starting PSICl + OH radical reactants. The rate coefficients were calculated for all possible paths in the atmospherically relevant temperature range of 200-320 K and at 1 atm. The rate coefficient for the formation of the PSIA + Cl radical from the PSICl + OH radical reaction was found to be 8.2 × 10-12 cm3 molecule-1 s-1 at 298 K and a pressure of 1 atm. From branching ratio calculations, it was revealed that the reaction resulting in the formation of the PSIA + Cl radical contributed ∼52% to the total reaction. The overall rate coefficient for the PSICl + OH reaction was also calculated and found to be 1.6 × 10-11 cm3 molecule-1 s-1 at 298 K and a pressure of 1 atm. In the aggregate, the results indicate the atmospheric lifetime of PSICl to be ∼12-20 h in the temperature range between 200 and 320 K, which suggests that its contribution to global warming is negligible. However, the degradation products revealed to be formed in its interactions with the OH radical, which include that SO2, Cl radical, HO2 radical, and propylene have significant effects on the formation of acid rain, secondary organic aerosols, the ozone layer, and global warming.
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Affiliation(s)
- Parandaman Arathala
- Department of Chemistry, University at Albany─State University of New York, 1400 Washington Avenue, Albany, New York 12222, United States
| | - Rabi A Musah
- Department of Chemistry, University at Albany─State University of New York, 1400 Washington Avenue, Albany, New York 12222, United States
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Kjærgaard ER, Vogt E, Møller KH, Nielsen OJ, Kjaergaard HG. Atmospheric Chemistry of CH 3OCF 2CHF 2. J Phys Chem A 2021; 125:10640-10648. [PMID: 34904843 DOI: 10.1021/acs.jpca.1c08973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Fourier transform infrared spectroscopy has been used to follow the reaction of CH3OCF2CHF2 with either Cl or OH radicals within a photoreactor. Rate constants of k(OH + CH3OCF2CHF2) = (2.25 ± 0.60) × 10-14 cm3 molecule-1 s-1 and k(Cl + CH3OCF2CHF2) = (2.50 ± 0.39) × 10-13 cm3 molecule-1 s-1 were determined at 296 ± 2 K. Theoretical and experimental investigation of the Cl + CH3OCF2CHF2 reaction identified the formation of two main products, HC(O)OCF2CHF2 and COF2. Chlorine (and OH) radicals react with CH3OCF2CHF2 by H-abstraction from either the -CH3 or -CHF2 site. Abstraction from the -CH3 site was determined to constitute at least 60%, as determined from the formation of the primary product, HC(O)OCF2CHF2, which can only form from this abstraction site. At longer reaction times, HC(O)OCF2CHF2 further reacts and the yield of COF2 approaches two, the maximum possible with the number of F atoms in the reactant. The atmospheric lifetime of CH3OCF2CHF2 with OH radicals was determined to be 1.4 years. The global warming potentials over 20-, 100-, and 500-year time horizons were estimated to be 325, 88, and 25, respectively.
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Affiliation(s)
- Eva R Kjærgaard
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
| | - Emil Vogt
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
| | - Kristian H Møller
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
| | - Ole John Nielsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
| | - Henrik G Kjaergaard
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
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Subramani M, Saravanan V, Theerthagiri J, Subramaniam V, Pazhanivel T, Ramasamy S, Manickam S. Kinetics and degradation of camphene with OH radicals and its subsequent fate under the atmospheric O 2 and NO radicals - A theoretical study. CHEMOSPHERE 2021; 267:129250. [PMID: 33338722 DOI: 10.1016/j.chemosphere.2020.129250] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 11/28/2020] [Accepted: 12/06/2020] [Indexed: 06/12/2023]
Abstract
Camphene (C10H16) is an abundant bicyclic monoterpene in the atmosphere which can be easily oxidized by the atmospheric OH radicals. In this study, the oxidation of camphene with OH radicals and its subsequent reactions are studied using quantum chemical method. Thermochemical parameters show that the addition of OH radicals to the terminal C10 atom of camphene is thermodynamically more stable than the addition of OH radicals to the internal C7 atom of camphene. The reaction force profile demonstrates that the formation of two hydroxyalkoxy radical intermediates (I1a and I2a) are mainly dominated by the structural rearrangement with 94.28% and 99.43% of the total energy, respectively. The overall reaction rate coefficient for camphene + OH radical is 2.1⨯10-12 cm3 molecule-1 sec-1 at 298 K and 1 atm which agree well with the experimental reaction rate coefficient (5.58⨯10-11 cm3 molecule-1 sec-1) for the reaction of camphene with OH radical. The branching ratio for the addition of OH radical to the C10 position of camphene is 68.32%, and the C7 position of camphene is 31.68% at 298 K. The calculated lifetime reveals that camphene degrades quickly in the atmosphere owing to its short lifetime of 5.3 h. The obtained mechanistic and kinetic results reveal that the addition of OH radical to the C10 position is more dominant than the C7 position, and it is more stable and spontaneous in the atmosphere.
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Affiliation(s)
| | - Vinnarasi Saravanan
- Department of Physics, Bharathiar University, Coimbatore, Tamil Nadu, 641046, India
| | - Jayaraman Theerthagiri
- Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 52828, South Korea
| | | | - Thangavelu Pazhanivel
- Smart Materials Interface Laboratory, Department of Physics, Periyar University, Salem, Tamilnadu, 636011, India
| | - Shankar Ramasamy
- Department of Physics, Bharathiar University, Coimbatore, Tamil Nadu, 641046, India.
| | - Sivakumar Manickam
- Petroleum and Chemical Engineering, Faculty of Engineering, Universiti Teknologi Brunei, Bandar Seri Begawan, BE1410, Brunei Darussalam
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Baidya B, Lily M, Patgiri D, Hynniewta S, Chandra AK. CHF 2CF 2OCHF 2: conformational analysis and direct dynamics study of its reaction with Cl atoms and atmospheric fate. NEW J CHEM 2020. [DOI: 10.1039/c9nj06069c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Conformers of CHF2CF2OCHF2 are identified, and the kinetics of its reaction with Cl atoms and final atmospheric degradation products are studied to assess atmospheric impact.
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Affiliation(s)
- Bidisha Baidya
- Centre for Advanced Studies in Chemistry
- North – Eastern Hill University
- Shillong
- India
| | - Makroni Lily
- Centre for Advanced Studies in Chemistry
- North – Eastern Hill University
- Shillong
- India
| | - Dimpal Patgiri
- Centre for Advanced Studies in Chemistry
- North – Eastern Hill University
- Shillong
- India
| | - Shemphang Hynniewta
- Centre for Advanced Studies in Chemistry
- North – Eastern Hill University
- Shillong
- India
| | - Asit K. Chandra
- Centre for Advanced Studies in Chemistry
- North – Eastern Hill University
- Shillong
- India
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Paul S, Mishra BK, Baruah SD, Deka RC, Gour NK. Atmospheric oxidation of HFE-7300 [n-C 2F 5CF(OCH 3)CF(CF 3) 2] initiated by •OH/Cl oxidants and subsequent degradation of its product radical: a DFT approach. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:907-920. [PMID: 31820248 DOI: 10.1007/s11356-019-06975-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 11/05/2019] [Indexed: 06/10/2023]
Abstract
To understand the atmospheric chemistry of hydrofluoroethers, we have studied the oxidation of a highly fluorinated compound n-C2F5CF(OCH3)CF(CF3)2 (HFE-7300) by OH/Cl oxidants. Here, we have employed M06-2X functional along with a 6-31 + G(d,p) basis set to obtain the optimized structures, various forms of energies, and different modes of frequencies for all species. We have characterized energies of all species on the potential energy surface, and it indicates that H-abstraction from n-C2F5CF(OCH3)CF(CF3)2 by Cl atom is kinetically more dominant than the H-abstraction reaction initiated by OH radical. In contrast, the calculated energy change (ΔrH°298 and ΔrG°298) results govern that OH-initiated H-abstraction reaction is highly exothermic and spontaneous compared to the Cl-initiated H-abstraction reaction. Rate constants are estimated using transition state theory as well as canonical variation transition state theory at the temperature range 200-1000 K and 1 atm pressure. The calculated rate constants of the H-abstraction channels are found to be in good agreement with the reported experimental rate constant at 298 K. Moreover, we have estimated the atmospheric lifetimes of HFE-7300 for the reaction with OH radical and Cl atom and are found to be 1.75 and 153.93 years, respectively. Additionally, the global warming potentials for HFE-7300 molecule are also estimated for 20-, 100-, and 500-year time horizons. Further, subsequent aerial oxidation of product radical (n-C2F5CF(OCH2)CF(CF3)2) in the presence of NO radical is performed, and it produced alkoxy radical via formation of peroxy radical. This alkoxy radical undergoes unimolecular decompositions via two different ways and formed n-C2F5CF(OCHO)CF(CF3)2 and n-C2F5CF(OH) CF(CF3)2 products.
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Affiliation(s)
- Subrata Paul
- Department of Chemical Sciences, Tezpur University Tezpur, Tezpur, Assam, 784028, India
| | - Bhupesh Kumar Mishra
- Department of Chemistry, D. N. Government College, Itanagar, Arunachal Pradesh, 791113, India
| | - Satyajit Dey Baruah
- Department of Chemical Sciences, Tezpur University Tezpur, Tezpur, Assam, 784028, India
| | - Ramesh Chandra Deka
- Department of Chemical Sciences, Tezpur University Tezpur, Tezpur, Assam, 784028, India
| | - Nand Kishor Gour
- Department of Chemical Sciences, Tezpur University Tezpur, Tezpur, Assam, 784028, India.
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Paul S, Gour NK, Deka RC. Oxidation pathways, kinetics and branching ratios of chloromethyl ethyl ether (CMEE) initiated by OH radicals and the fate of its product radical: an insight from a computational study. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2019; 21:1519-1531. [PMID: 31274139 DOI: 10.1039/c9em00104b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The OH-initiated oxidation reactions of chloromethyl ethyl ether (CH2ClOCH2CH3) have been presented by using quantum calculation methods. The Minnesota functional (M06-2X) of the density functional theory method along with a polarization and diffuse 6-311++G(d,p) basis set is chosen for optimization and frequency calculations for H-abstractions from CH2ClOCH2CH3 molecules by OH radicals. Furthermore, the CCSD(T) method along with the same basis set is used for energy refinement of all optimized structures to obtain more accurate energies of the species. Our thermo-chemical calculation results show that the C˙HClOCH2CH3 product radical is more stable, corresponding to hydrogen atom abstraction from the -CH2Cl site, than others while the energy profile results indicate that the H-atom abstracted from the -OCH2 site follows the minimum energy path compared to other channels. The rate constants are computed using canonical transition state theory (CTST) within the temperature range of 250-450 K at 1 atm. The overall rate constant (at 298 K) for the abstraction reactions is found to be consistent with the earlier reported rate constant. The percentage branching ratios of different abstraction channels and the lifetime of chloromethyl ethyl ether are also given herein. We further investigated the unimolecular decomposition pathways of the CH2ClOCH(O˙)CH3 radical and found that unimolecular C-C bond scission is the kinetically and thermodynamically more feasible pathway compared to other unimolecular decomposition reactions.
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Affiliation(s)
- Subrata Paul
- Department of Chemical Sciences, Tezpur University Tezpur, Assam - 784028, India.
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Salta Z, Liaska S, Papayannis DK, Lesar A, Kosmas AM. Computational studies on the reactions of the peroxy radical CF3OCH2O2 with HO2 and NO. COMPUT THEOR CHEM 2019. [DOI: 10.1016/j.comptc.2019.112510] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Le XT, Mai TVT, Duong MV, Huynh LK. Kinetics of hydrogen abstraction from desflurane by OH and Cl radicals – A theoretical study. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.04.059] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Hass SA, Andersen ST, Sulbaek Andersen MP, Nielsen OJ. Atmospheric Chemistry of Methoxyflurane (CH3OCF2CHCl2): Kinetics of the gas-phase reactions with OH radicals, Cl atoms and O3. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.02.041] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Begum SS, Gour NK, Baruah SD, Deka RC. Kinetics and mechanism of 3-chloro-2-methyl-1-propene(3-ClMP) initiated by OH radical: an insight from DFT calculations [1]. Mol Phys 2019. [DOI: 10.1080/00268976.2018.1509146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
| | - Nand Kishor Gour
- Department of Chemical Sciences, Tezpur University Tezpur, Assam, India
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Paul S, Gour NK, Chandra Deka R. Quantum mechanical study on the oxidation of ethyl vinyl ketone initiated by an OH radical. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2018; 20:1708-1715. [PMID: 30339175 DOI: 10.1039/c8em00365c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Oxidation of ethyl vinyl ketone (CH2CHCOCH2CH3) by an OH radical was carried out using the M06-2X/6-311++G(d,p) level of theory. For the OH-initiated oxidation of ethyl vinyl ketone (EVK), we have considered six H-atom abstractions and three addition reactions. From the energetic calculation of the species involved therein, the potential energy surface (PES) of all the reaction channels was constructed. From the energy profile, we found that the H-atom abstraction from the methylene group (-CH2-) of CH2CHCOCH2CH3 is energetically more favourable than the other H-abstraction channels. Moreover, we also observed that OH-addition to the α-carbon of the carbon-carbon double bond of the title molecule is energetically and thermodynamically more dominant than β-carbon and carbonyl carbon. The rate coefficients for all the reaction channels were calculated using the canonical transition state theory at the temperature range of 250-450 K and it reveals that among all the reaction channels, OH-addition to α-carbon is kinetically more dominant to the total rate constant. The total rate coefficient for the reaction at 298 K is found to be in good agreement with the reported experimental rate constant. Finally, we have determined the atmospheric lifetime of the title molecule.
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Affiliation(s)
- Subrata Paul
- Department of Chemical Sciences, Tezpur University, Napaam, Tezpur, 784028, Assam, India.
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Paul S, Deka RC, Gour NK. Kinetics, mechanism, and global warming potentials of HFO-1234yf initiated by O 3 molecules and NO 3 radicals: insights from quantum study. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:26144-26156. [PMID: 29971745 DOI: 10.1007/s11356-018-2633-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Accepted: 06/20/2018] [Indexed: 06/08/2023]
Abstract
In the present investigation, the oxidation of HFO-1234yf (2,3,3,3-tetrafluoropropene) with O3 molecule and NO3 radical is studied by quantum chemical methods. The possible reaction pathways of the titled molecule with O3 molecule and NO3 radical are analyzed using M06-2X meta-hybrid density functional with the 6-311++G(d,p) basis set. We have further employed a series of single-point energy calculations by using a potentially high-level couple cluster method with single and double excitations, including perturbative corrections ((CCSD(T)) at the same basis set. The addition reaction of HFO-1234yf with O3 molecule is initiated by the formation of primary ozonide complex, which leads to the formation of various carbonyl compounds and Criegee intermediates. The calculated energy barriers and thermochemical parameters inferred that decomposition of C˙H2OO˙ and CF3CFO is slightly more preferred over the formation of CF3C˙FOO˙ and CH2O. Further, the NO3 radical addition at α- and β-sits of CF3CF〓CH2 molecule is analyzed in details. The individual and overall rate constants for each reaction pathways are calculated by using canonical transition state theory over the temperature range of 250-450 K. We have observed that the computed rate constants are in good agreement with the available experimental data. Atmospheric lifetimes and global warming potentials of the HFO-1234yf are also reported in this manuscript.
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Affiliation(s)
- Subrata Paul
- Department of Chemical Sciences, Tezpur University, Tezpur, Assam, 784028, India
| | - Ramesh Chandra Deka
- Department of Chemical Sciences, Tezpur University, Tezpur, Assam, 784028, India
| | - Nand Kishor Gour
- Department of Chemical Sciences, Tezpur University, Tezpur, Assam, 784028, India.
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Begum SS, Deka RC, Gour NK. Theoretical prediction of the mechanistic pathways and kinetics of methylcyclohexane initiated by OH radicals. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1436202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
| | | | - Nand Kishor Gour
- Department of Chemical Sciences, Tezpur University, Tezpur, India
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Baruah SD, Gour NK, Sarma PJ, Deka RC. OH-initiated mechanistic pathways and kinetics of camphene and fate of product radical: a DFT approach. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:2147-2156. [PMID: 29116529 DOI: 10.1007/s11356-017-0646-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 10/30/2017] [Indexed: 06/07/2023]
Abstract
Present manuscript represents the DFT studies on the oxidation reaction of camphene initiated by OH radical and fate of product radicals using M06-2X functional along with 6-31+G(d,p) basis set. Intrinsic reaction calculation is done for transition states involving OH-addition reactions which proceed via reaction complexes proceeding to the formation of transition states. The rate constant calculated by using canonical transition state theory at 298 K and 1 atm is found to be 5.67 × 10-11 cm3 molecule-1 s-1 which is in good agreement with the experimental rate constant. The atmospheric lifetime of the titled molecule has also been reported in our work.
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Affiliation(s)
- Satyajit Dey Baruah
- Department of Chemical Sciences, Tezpur University Tezpur, Napaam, Assam, 784028, India
| | - Nand Kishor Gour
- Department of Chemical Sciences, Tezpur University Tezpur, Napaam, Assam, 784028, India.
| | - Plaban Jyoti Sarma
- Department of Chemical Sciences, Tezpur University Tezpur, Napaam, Assam, 784028, India
| | - Ramesh Chandra Deka
- Department of Chemical Sciences, Tezpur University Tezpur, Napaam, Assam, 784028, India.
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Tropospheric degradation of HFE-7500[ n -C 3 F 7 CF(OCH 2 CH 3 )CF(CF 3 ) 2 ] initiated by OH radicals and Fate of alkoxy radical [ n -C 3 F 7 CF(OCH(O )CH 3 )CF(CF 3 ) 2 ]: A DFT investigation. J Fluor Chem 2017. [DOI: 10.1016/j.jfluchem.2017.09.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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Theoretical investigation on the kinetics and thermochemisty of H-atom abstraction reactions of 2-chloroethyl methyl ether (CH3OCH2CH2Cl) with OH radical at 298 K. Struct Chem 2016. [DOI: 10.1007/s11224-016-0771-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Mishra BK, Lily M, Deka RC, Chandra AK. A theoretical insight into atmospheric chemistry of HFE-7100 and perfluoro-butyl formate: reactions with OH radicals and Cl atoms and the fate of alkoxy radicals. NEW J CHEM 2016. [DOI: 10.1039/c5nj02752g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The calculated rate constants for C4F9OCH3 + OH/Cl reactions are found to be 1.94 × 10−14 and 1.74 × 10−12 cm3 molecule−1 s−1, respectively, at 298 K. The atmospheric lifetime and global warming potential for HFE-7100 are computed to be 2.12 years and 155.3, respectively.
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Affiliation(s)
| | - Makroni Lily
- Department of Chemistry
- North-Eastern Hill University
- Shillong – 793 022
- India
| | | | - Asit K. Chandra
- Department of Chemistry
- North-Eastern Hill University
- Shillong – 793 022
- India
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19
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Bhattacharjee D, Tiwari L, Singh HJ, Mishra BK, Deka RC. Theoretical investigation on mechanism, kinetics and thermochemistry of gas-phase reactions of ethyl trifluoroacetate with OH radicals. J Fluor Chem 2015. [DOI: 10.1016/j.jfluchem.2015.07.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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20
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Lily M, Chandra AK. Theoretical investigation on kinetics and thermochemistry of reaction of CHF 2CF 2OCH 2CF 3with OH radicals and global warming potentials. Mol Phys 2015. [DOI: 10.1080/00268976.2014.955541] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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21
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GOUR NANDKISHOR, GUPTA SATYENDRA, MISHRA BHUPESHKUMAR, SINGH HARIJI. A computational study on kinetics, mechanism and thermochemistry of gas-phase reactions of 3-hydroxy-2-butanone with OH radicals. J CHEM SCI 2015. [DOI: 10.1007/s12039-014-0733-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Papadimitriou VC, Spitieri CS, Papagiannakopoulos P, Cazaunau M, Lendar M, Daële V, Mellouki A. Atmospheric chemistry of (CF3)2CCH2: OH radicals, Cl atoms and O3 rate coefficients, oxidation end-products and IR spectra. Phys Chem Chem Phys 2015; 17:25607-20. [DOI: 10.1039/c5cp03840e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
OH, Cl and O3 kinetics and IR spectra of (CF3)2CCH2 utilized to estimate tropospheric lifetimes, radiative efficiencies, global warming potentials, estimated photochemical ozone creation potentials and tropospheric oxidation end-products.
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Affiliation(s)
| | - Christina S. Spitieri
- Laboratory of Photochemistry and Kinetics
- Department of Chemistry
- University of Crete
- Heraklion
- Greece
| | - Panos Papagiannakopoulos
- Laboratory of Photochemistry and Kinetics
- Department of Chemistry
- University of Crete
- Heraklion
- Greece
| | - Mathieu Cazaunau
- Institut de Combustion
- Aérothermique
- Réactivité et Environnement
- CNRS/OSUC
- Orléans
| | - Maria Lendar
- Institut de Combustion
- Aérothermique
- Réactivité et Environnement
- CNRS/OSUC
- Orléans
| | - Véronique Daële
- Institut de Combustion
- Aérothermique
- Réactivité et Environnement
- CNRS/OSUC
- Orléans
| | - Abdelwahid Mellouki
- Institut de Combustion
- Aérothermique
- Réactivité et Environnement
- CNRS/OSUC
- Orléans
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23
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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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24
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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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25
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The reaction mechanisms and kinetics of CF3CHFOCH3 and CHF2CHFOCF3 with atomic chlorine: a computational study. J Mol Model 2014; 20:2435. [DOI: 10.1007/s00894-014-2435-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 08/25/2014] [Indexed: 10/24/2022]
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26
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Bai F, Sun Y, Wang X, Jia Z, Wang R, Pan X. Theoretical investigation of the mechanisms and dynamics of the reaction CHF2OCF 2CHFCl+Cl. J Mol Model 2014; 20:2419. [PMID: 25129661 DOI: 10.1007/s00894-014-2419-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2014] [Accepted: 07/16/2014] [Indexed: 11/28/2022]
Abstract
The reaction of CHF2OCF2CHFCl with atomic chlorine was studied using B3LYP/6-311G(d,p), BHandHLYP/6-311G(d,p), and M06-2X/6-311G(d,p) methods and further using CCSD(T) and QCISD(T) methods. Two hydrogen abstraction channels were found for the title reaction. Dynamics calculations were followed by means of canonical variational transition state with the small-curvature tunneling correction between 220 and 2,000 K. Our rate constant k = 2.90 × 10(-15) cm(3) molecule(-1) s(-1) is in reasonable agreement with the available data (3.20 ± 0.32) × 10(-15) cm(3) molecule(-1) s(-1) at 296 K. The three-parameter Arrhenius expression (in the unit of cm(3) molecule(-1) s(-1)) for the title reaction is given as k (T) = 1.38 × 10 (-19) T (2.57) exp (-2622.95/T).
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Affiliation(s)
- Fengyang Bai
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
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27
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Mishra BK, Lily M, Chandra AK, Deka RC. Theoretical studies on atmospheric chemistry of HFE-347mcc3: reactions with OH radicals and Cl atoms. J PHYS ORG CHEM 2014. [DOI: 10.1002/poc.3340] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | - Makroni Lily
- Department of Chemistry; North - Eastern Hill University; Shillong 793 022 India
| | - Asit K. Chandra
- Department of Chemistry; North - Eastern Hill University; Shillong 793 022 India
| | - Ramesh Chandra Deka
- Department of Chemical Sciences; Tezpur University Tezpur; Assam 784 028 India
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28
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Theoretical studies on kinetics, mechanism and thermochemistry of gas-phase reactions of HFE-449mec-f with OH radicals and Cl atom. J Mol Graph Model 2014; 53:23-30. [PMID: 25068438 DOI: 10.1016/j.jmgm.2014.07.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Revised: 07/04/2014] [Accepted: 07/07/2014] [Indexed: 11/21/2022]
Abstract
A theoretical study on the mechanism and kinetics of the gas phase reactions of CF3CHFCF2OCH2CF3 (HFE-449mec-f) with the OH radicals and Cl atom have been performed using meta-hybrid modern density functional M06-2X using 6-31+G(d,p) basis set. Two conformers have been identified for CF3CHFCF2OCH2CF3 and the most stable one is considered for detailed study. Reaction profiles for OH-initiated hydrogen abstraction are modeled including the formation of pre-reactive and post-reactive complexes at entrance and exit channels. Our calculations reveal that hydrogen abstraction from the CH2 group is thermodynamically and kinetically more facile than that from the CHF group. Using group-balanced isodesmic reactions, the standard enthalpies of formation for HFE-449mecf and radicals generated by hydrogen abstraction, are also reported. The calculated bond dissociation energies for CH bonds are in good agreement with experimental results. The rate constants of the two reactions are determined for the first time in a wide temperature range of 250-450K. The calculated rate constant values are found to be 9.10×10(-15) and 4.77×10(-17)cm(3)molecule(-1)s(-1) for reactions with OH radicals and Cl atom, respectively. At 298K, the total calculated rate coefficient for reactions with OH radical is in good agreement with the experimental results. The atmospheric life time of HFE-449mec-f is estimated to be 0.287 years.
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29
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Theoretical study on the gas-phase reactions of ethyl butyrate with OH radicals at 298 K. MONATSHEFTE FUR CHEMIE 2014. [DOI: 10.1007/s00706-014-1255-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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30
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A computational perspective on mechanism and kinetics of the reactions of CF3C(O)OCH2CF3 with OH radicals and Cl atoms at 298K. J Fluor Chem 2014. [DOI: 10.1016/j.jfluchem.2014.01.017] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Theoretical investigation of the atmospheric chemistry of methyl difluoroacetate: reaction with Cl atoms and fate of alkoxy radical at 298 K. Struct Chem 2014. [DOI: 10.1007/s11224-014-0425-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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32
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33
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Zhu P, Ai LL, Wang H, Liu JY. Theoretical studies on mechanism and kinetics of the hydrogen-abstraction reaction of CF2HCOOCH3 with OH radicals. COMPUT THEOR CHEM 2014. [DOI: 10.1016/j.comptc.2013.12.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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34
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Sutradhar D, Zeegers-Huyskens T, Chandra AK. A theoretical investigation on the conformation and the interaction of CHF₂OCF₂CHF₂ (desflurane II) with one water molecule. J Mol Model 2013; 19:5045-52. [PMID: 24077838 DOI: 10.1007/s00894-013-2016-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Accepted: 09/15/2013] [Indexed: 10/26/2022]
Abstract
The conformation and the interaction of CHF₂OCF₂CHF₂ (desflurane II) with one water molecule is investigated theoretically using the ab initio MP2/aug-cc-pvdz and DFT-based M062X/6-311++G(d,p) methods. The calculations include the optimized geometries, the harmonic frequencies of relevant vibrational modes along with a natural bond orbital (NBO) analysis including the NBO charges, the hybridization of the C atom and the intra- and intermolecular hyperconjugation energies. In the two most stable conformers, the CH bond of the F2HCO- group occupies the gauche position. The hyperconjugation energies are about the same for both conformers and the conformational preference depends on the interaction between the non-bonded F and H atoms. The deprotonation enthalpies of the CH bonds are about the same for both conformers, the proton affinity of the less stable conformer being 3 kcal mol−1 higher. Both conformers of desflurane II interact with water forming cyclic complexes characterized by CH…O and OH…F hydrogen bonds. The binding energies are moderate, ranging from −2.4 to −3.2 kcal mol−1 at the MP2 level. The origin of the blue shifts of the ν(CH) vibrations is analyzed. In three of the complexes, the water molecule acts as an electron donor. Interestingly, in these cases a charge transfer is also directed to the non bonded OH group of the water molecule. This effect seems to be a property of polyfluorinated ethers.
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35
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Lily M, Sutradhar D, Chandra AK. Theoretical investigations on kinetics, mechanism and thermochemistry of the gas phase reactions of CHF2OCF2CHF2 with OH radicals. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2013.08.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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36
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A theoretical investigation on the kinetics and reactivity of the gas-phase reactions of ethyl chlorodifluoroacetate with OH radical and Cl atom at 298 K. Struct Chem 2013. [DOI: 10.1007/s11224-013-0312-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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37
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Zeegers-Huyskens T, Lily M, Sutradhar D, Chandra AK. Theoretical Study of the O···Cl Interaction in Fluorinated Dimethyl Ethers Complexed with a Cl Atom: Is It through a Two-Center–Three-Electron Bond? J Phys Chem A 2013; 117:8010-6. [PMID: 23876015 DOI: 10.1021/jp4046353] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Makroni Lily
- Department of Chemistry, North-Eastern Hill University, Shillong 793022, India
| | - Dipankar Sutradhar
- Department of Chemistry, North-Eastern Hill University, Shillong 793022, India
| | - Asit K. Chandra
- Department of Chemistry, North-Eastern Hill University, Shillong 793022, India
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38
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Theoretical investigation of the gas-phase reactions of CF2ClC(O)OCH3 with the hydroxyl radical and the chlorine atom at 298 K. J Mol Model 2013; 19:3263-70. [DOI: 10.1007/s00894-013-1865-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Accepted: 04/19/2013] [Indexed: 10/26/2022]
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39
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Wang L, Zhao J, He H, Zhang J. Theoretical studies on the reactions of CHF2CF2OCH3/CH2FCF2OCH3 with OH radicals. J Fluor Chem 2013. [DOI: 10.1016/j.jfluchem.2013.02.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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40
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Poutsma ML. Evolution of Structure–Reactivity Correlations for the Hydrogen Abstraction Reaction by Chlorine Atom. J Phys Chem A 2013; 117:687-703. [DOI: 10.1021/jp310970t] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Marvin L. Poutsma
- Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee
37831-6197, United States
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41
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Chandra AK. Theoretical studies on the kinetics and mechanism of the gas-phase reactions of CHF2OCHF2 with OH radicals. J Mol Model 2012; 18:4239-47. [PMID: 22562169 DOI: 10.1007/s00894-012-1432-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Accepted: 04/10/2012] [Indexed: 10/28/2022]
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42
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Romanias MN, Stefanopoulos VG, Papanastasiou DK, Papadimitriou VC, Papagiannakopoulos P. Temperature-dependent rate coefficients and mechanism for the gas-phase reaction of chlorine atoms with acetone. INT J CHEM KINET 2010. [DOI: 10.1002/kin.20517] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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43
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Song G, Jia X, Gao Y, Luo J, Yu Y, Wang R, Pan X. Theoretical Studies on the Mechanisms and Dynamics of OH Radicals with CH2FCF2OCHF2 and CH2FOCH2F. J Phys Chem A 2010; 114:9057-68. [PMID: 20669929 DOI: 10.1021/jp102421g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Guicai Song
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China
| | - Xiujuan Jia
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China
| | - Yang Gao
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China
| | - Jie Luo
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China
| | - Yanbo Yu
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China
| | - Rongshun Wang
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China
| | - Xiumei Pan
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China
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44
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Bravo I, Aranda A, Díaz-de-Mera Y, Moreno E, Tucceri ME, Rodríguez D. Kinetic, mechanistic and temperature dependence study of Cl reactions with CH3OC(O)H and CH3CH2OC(O)H. Atmospheric implications. Phys Chem Chem Phys 2009; 11:384-90. [DOI: 10.1039/b810285f] [Citation(s) in RCA: 5] [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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45
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Wallington TJ, Hurley MD, Javadi MS, Nielsen OJ. Kinetics and products of chlorine atom initiated oxidation of HCF2OCF2OCF2CF2OCF2H and HCF2O(CF2O)n-(CF2CF2O)mCF2H. INT J CHEM KINET 2008. [DOI: 10.1002/kin.20349] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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46
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Morozov I, Gligorovski S, Barzaghi P, Hoffmann D, Lazarou YG, Vasiliev E, Herrmann H. Hydroxyl radical reactions with halogenated ethanols in aqueous solution: Kinetics and thermochemistry. INT J CHEM KINET 2008. [DOI: 10.1002/kin.20301] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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47
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Papadimitriou VC, Papanastasiou DK, Stefanopoulos VG, Zaras AM, Lazarou YG, Papagiannakopoulos P. Kinetic Study of the Reactions of Cl Atoms with CF3CH2CH2OH, CF3CF2CH2OH, CHF2CF2CH2OH, and CF3CHFCF2CH2OH. J Phys Chem A 2007; 111:11608-17. [DOI: 10.1021/jp074728e] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vassileios C. Papadimitriou
- Laboratory of Photochemistry and Kinetics, Department of Chemistry, University of Crete, 71003 Heraklion, Crete, Greece
| | - Dimitrios K. Papanastasiou
- Laboratory of Photochemistry and Kinetics, Department of Chemistry, University of Crete, 71003 Heraklion, Crete, Greece
| | - Vassileios G. Stefanopoulos
- Laboratory of Photochemistry and Kinetics, Department of Chemistry, University of Crete, 71003 Heraklion, Crete, Greece
| | - Aristotelis M. Zaras
- Laboratory of Photochemistry and Kinetics, Department of Chemistry, University of Crete, 71003 Heraklion, Crete, Greece
| | - Yannis G. Lazarou
- Laboratory of Photochemistry and Kinetics, Department of Chemistry, University of Crete, 71003 Heraklion, Crete, Greece
| | - Panos Papagiannakopoulos
- Laboratory of Photochemistry and Kinetics, Department of Chemistry, University of Crete, 71003 Heraklion, Crete, Greece
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48
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Yang L, Liu JY, Wang L, He HQ, Wang Y, Li ZS. Theoretical study of the reactions CF3CH2OCHF2+ OH/Cl and its product radicals and parent ether(CH3CH2OCH3) with OH. J Comput Chem 2007; 29:550-61. [PMID: 17705163 DOI: 10.1002/jcc.20813] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A dual-level direct dynamic method is employed to study the reaction mechanisms of CF3CH2OCHF2 (HFE-245fa2; HFE-245mf) with the OH radicals and Cl atoms. Two hydrogen abstraction channels and two displacement processes are found for each reaction. For further study, the reaction mechanisms of its products (CF3CH2OCF2 and CF3CHOCHF2) and parent ether CH3CH2OCH3 with OH radical are investigated theoretically. The geometries and frequencies of all the stationary points and the minimum energy paths (MEPs) are calculated at the B3LYP/6-311G(d,p) level. The energetic information along the MEPs is further refined at the G3(MP2) level of theory. For reactions CF3CH2OCHF2 + OH/Cl, the calculation indicates that the hydrogen abstraction from --CH2-- group is the dominant reaction channel, and the displacement processes may be negligible because of the high barriers. The standard enthalpies of formation for the reactant CF3CH2OCHF2, and two products CF3CH2OCHF2 and CF3CHOCHF2 are evaluated via group-balanced isodesmic reactions. The rate constants of reactions CF3CH2OCHF2 + OH/Cl and CH3CH2OCH3 + OH are estimated by using the variational transition state theory over a wide range of temperature (200-2000 K). The agreement between the theoretical and experimental rate constants is good in the measured temperature range. From the comparison between the rate constants of the reactions CF3CH2OCHF2 and CH3CH2OCH3 with OH, it is shown that the fluorine substitution decreases the reactivity of the C--H bond.
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Affiliation(s)
- Lei Yang
- State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People's Republic of China
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49
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Yang L, He HQ, Ji YM, Liu JY, Li ZS. Direct ab initio dynamics calculations of the rate constants for the reaction of CHF2CF2OCH3 with Cl. INT J CHEM KINET 2007. [DOI: 10.1002/kin.20230] [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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50
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Oyaro N, Sellevåg SR, Nielsen CJ. Atmospheric Chemistry of Hydrofluoroethers: Reaction of a Series of Hydrofluoroethers with OH Radicals and Cl Atoms, Atmospheric Lifetimes, and Global Warming Potentials. J Phys Chem A 2004; 109:337-46. [PMID: 16833352 DOI: 10.1021/jp047860c] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The kinetics of the OH radical and Cl atom reactions with nine fluorinated ethers have been studied by the relative rate method at 298 K and 1013 hPa using gas chromatography-mass spectroscopy (GC-MS) detection: k(OH + CH3CH2OCF3) = (1.55 +/- 0.25) x 10(-13), k(OH + CF3CH2OCH3) = (5.7 +/- 0.8) x 10(-13),k(OH + CF3CH2OCHF2) = (9.1 +/- 1.1) x 10(-15), k(OH + CF3CHFOCHF2) = (6.5 +/- 0.8) x 10(-15), k(OH + CHF2CHFOCF3) = (6.8 +/- 1.1) x 10(-15), k(OH + CF3CHFOCF3) < 1 x 10(-15), k(OH + CF3CHFCF2OCHF2) = (1.69 +/- 0.26) x 10(-14), k(OH + CF3CHFCF2OCH2CH3) = (1.47 +/- 0.13) x 10(-13), k(OH + CF3CF2CF2OCHFCF3) < 1 x 10(-15), k(Cl + CH3CH2OCF3) = (2.2 +/- 0.8) x 10(-12), k(Cl + CF3CH2OCH3) = (1.8 +/- 0.9) x 10(-11), k(Cl + CF3CH2OCHF2) = (1.5 +/- 0.4) x 10(-14), k(Cl + CF3CHFOCHF2) = (1.1 +/- 1.9) x 10(-15), k(Cl + CHF2CHFOCF3) = (1.2 +/- 2.0) x 10(-15), k(Cl + CF3CHFOCF3) < 3 x 10(-15), k(Cl + CF3CHFCF2OCHF2) < 6 x 10(-16), k(Cl + CF3CHFCF2OCH2CH3) = (3.1 +/- 1.1) x 10(-12), and k(Cl + CF3CF2CF2OCHFCF3) < 3 x 10(-15) cm3 molecule(-1) s(-1). The error limits include three standard deviations (3 sigma) from the statistical data analyses, as well as the errors in the rate coefficients of the reference compounds that are used. Infrared absorption cross sections and estimates of the trophospheric lifetimes and the global warming potentials of the fluorinated ethers are presented. The atmospheric degradation of the compounds is discussed.
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Affiliation(s)
- Nathan Oyaro
- Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, Norway
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