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Kaipara R, Rajakumar B. Cl Atom-Initiated Photo-Oxidation Reactions of Vinyl Trifluoroacetate and Allyl Trifluoroacetate in Tropospheric Conditions. J Phys Chem A 2020; 124:2123-2139. [DOI: 10.1021/acs.jpca.9b11166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Revathy Kaipara
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - B. Rajakumar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
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Gupta P, Rajakumar B. Cl Atoms and OH Radicals Initiated Kinetic and Mechanistic Study on the Degradation of Propyl Butanoate under Tropospheric Conditions. J Phys Chem A 2019; 123:10976-10989. [PMID: 31789521 DOI: 10.1021/acs.jpca.9b09546] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactivity of various OVOCs (mainly esters) in the troposphere leads to the generation of various organics, which in turn leads to an increase in the cloud acidity of the Earth's atmosphere. Hence, it becomes necessary to understand the mechanistic aspects of the reaction of these molecules with dominant atmospheric agents. In this study, the tropospheric degradation of one such ester, propyl butanoate (PB; CH3CH2CH2COOCH2CH2CH3) was studied with OH radicals and Cl atoms at the CCSD(T)//M06-2x/6-311+G(2d,2p) and CCSD(T)//BHandHLYP/6-311+G(2d,2p) level of theories over the studied temperature range of 200-400 K. The Arrhenius expressions obtained using the CVT/SCT/ISPE method were calculated as kPB + Cl (200-400 K) = 1.3 × 10-14 T1.3 exp[1335/T] cm3 molecule-1 s-1 and kPB + OH (200-400 K) = 1.8 × 10-26 T4.6 exp[4469/T] cm3 molecule-1 s-1. The obtained kinetics was also well validated against the SAR (structure-activity relationship)-based rate coefficients. The most prominent H-abstraction reaction channels were investigated for the PB + OH/Cl reaction. The abstraction of H atoms attached to the carbon atom present in the β-position to the ester (-C(O)O-) functionality was found to go via the lowest energy activation barriers for the reaction of PB toward both OH radicals and Cl atoms. The product degradation channels were also elucidated in an O2/NOx-rich environment. Moreover, to gauge the impact of the emitted PB on the troposphere, atmospheric lifetimes, radiative efficiencies, global warming potentials, and photochemical ozone creation potentials were also calculated and are included in the manuscript.
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Affiliation(s)
- Parth Gupta
- Department of Chemistry , Indian Institute of Technology, Madras , Chennai 600036 , India
| | - Balla Rajakumar
- Department of Chemistry , Indian Institute of Technology, Madras , Chennai 600036 , India
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Kaipara R, Rajakumar B. Temperature-Dependent Kinetics of the Reaction of a Criegee Intermediate with Propionaldehyde: A Computational Investigation. J Phys Chem A 2018; 122:8433-8445. [DOI: 10.1021/acs.jpca.8b06603] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Revathy Kaipara
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - B. Rajakumar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
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Paul S, Deka RC, Gour NK. Quantum chemical study on the reaction mechanism and kinetics of Cl-initiated oxidation of methyl n-propyl ether. Theor Chem Acc 2018. [DOI: 10.1007/s00214-018-2239-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Bai FY, Lv S, Ma Y, Liu CY, He CF, Pan XM. Understanding the insight into the mechanisms and dynamics of the Cl-initiated oxidation of (CH 3) 3CC(O)X and the subsequent reactions in the presence of NO and O 2 (X = F, Cl, and Br). CHEMOSPHERE 2017; 171:49-56. [PMID: 28002766 DOI: 10.1016/j.chemosphere.2016.12.037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 12/07/2016] [Accepted: 12/08/2016] [Indexed: 06/06/2023]
Abstract
In this work, the density functional and high-level ab initio theories are adopted to investigate the mechanisms and kinetics of reaction of (CH3)3CC(O)X (X = F, Cl, and Br) with atomic chlorine. Rate coefficients for the reactions of chlorine atom with (CH3)3CC(O)F (k1), (CH3)3CC(O)Cl (k2), and (CH3)3CC(O)Br (k3) are calculated using canonical variational transition state theory coupled with small curvature tunneling method over a wide range of temperatures from 250 to 1000 K. The dynamic calculations are performed by the variational transition state theory with the interpolated single-point energies method at the CCSD(T)/aug-cc-pVDZ//B3LYP/6-311++G(d,p) level of theory. Computed rate constant is in good line with the available experimental value. The rate constants for the title reactions are in this order: k1<k2<k3, suggesting that the effect of halogen substitution on the mechanisms and dynamics is different. The subsequent and secondary reactions for the hydrogen abstraction intermediates are studied involving NO and O2 molecules in the atmosphere. The atmospheric lifetime and global warming potential (GWP) of (CH3)3CC(O)X (X = F, Cl, and Br) are estimated, and it shows that (CH3)3CC(O)F have larger GWP value than that of (CH3)3CC(O)Cl and (CH3)3CC(O)Br. Due to the presence of Cl and Br atoms, the environmental impact of (CH3)3CC(O)Cl and (CH3)3CC(O)Br may be given more concerns.
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Affiliation(s)
- Feng-Yang Bai
- Institute of Functional Material Chemistry, National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
| | - Shuang Lv
- Institute of Functional Material Chemistry, National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
| | - Yuan Ma
- Institute of Functional Material Chemistry, National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
| | - Chun-Yu Liu
- Institute of Functional Material Chemistry, National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
| | - Chun-Fang He
- Institute of Functional Material Chemistry, National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
| | - Xiu-Mei Pan
- Institute of Functional Material Chemistry, National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China.
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Bai FY, Ma Y, Lv S, Pan XM, Jia XJ. Theoretical insight into OH- and Cl-initiated oxidation of CF 3OCH(CF 3) 2 and CF 3OCF 2CF 2H &fate of CF 3OC(X•)(CF 3) 2 and CF 3OCF 2CF 2X• radicals (X=O, O 2). Sci Rep 2017; 7:40264. [PMID: 28067283 PMCID: PMC5220334 DOI: 10.1038/srep40264] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Accepted: 12/05/2016] [Indexed: 11/17/2022] Open
Abstract
In this study, the mechanistic and kinetic analysis for reactions of CF3OCH(CF3)2 and CF3OCF2CF2H with OH radicals and Cl atoms have been performed at the CCSD(T)//B3LYP/6-311++G(d,p) level. Kinetic isotope effects for reactions CF3OCH(CF3)2/CF3OCD(CF3)2 and CF3OCF2CF2H/CF3OCF2CF2D with OH and Cl were estimated so as to provide the theoretical estimation for future laboratory investigation. All rate constants, computed by canonical variational transition state theory (CVT) with the small-curvature tunneling correction (SCT), are in reasonable agreement with the limited experimental data. Standard enthalpies of formation for the species were also calculated. Atmospheric lifetime and global warming potentials (GWPs) of the reaction species were estimated, the large lifetimes and GWPs show that the environmental impact of them cannot be ignored. The organic nitrates can be produced by the further oxidation of CF3OC(•)(CF3)2 and CF3OCF2CF2• in the presence of O2 and NO. The subsequent decomposition pathways of CF3OC(O•)(CF3)2 and CF3OCF2CF2O• radicals were studied in detail. The derived Arrhenius expressions for the rate coefficients over 230–350 K are: kT(1) = 5.00 × 10−24T3.57 exp(−849.73/T), kT(2) = 1.79 × 10−24T4.84 exp(−4262.65/T), kT(3) = 1.94 × 10−24T4.18 exp(−884.26/T), and kT(4) = 9.44 × 10−28T5.25 exp(−913.45/T) cm3 molecule−1 s−1.
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Affiliation(s)
- Feng-Yang Bai
- Institute of Functional Material Chemistry, National &Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024 Changchun, People's Republic of China
| | - Yuan Ma
- Institute of Functional Material Chemistry, National &Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024 Changchun, People's Republic of China
| | - Shuang Lv
- Institute of Functional Material Chemistry, National &Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024 Changchun, People's Republic of China
| | - Xiu-Mei Pan
- Institute of Functional Material Chemistry, National &Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, 130024 Changchun, People's Republic of China
| | - Xiu-Juan Jia
- School of Life Science, Northeast Normal University, 130024 Changchun, People's Republic of China
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Ye JT, Bai FY, Pan XM. Computational study of H-abstraction reactions from CH 3OCH 2CH 2Cl/CH 3CH 2OCH 2CH 2Cl by Cl atom and OH radical and fate of alkoxy radicals. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:23467-23484. [PMID: 27614635 DOI: 10.1007/s11356-016-7505-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 08/22/2016] [Indexed: 06/06/2023]
Abstract
UNLABELLED Multichannel gas-phase reactions of CH3OCH2CH2Cl/CH3CH2OCH2CH2Cl with chlorine atom and hydroxyl radical have been investigated using ab initio method and canonical variational transition-state dynamic computations with the small-curvature tunneling correction. Further energetic information is refined by the coupled-cluster calculations with single and double excitations (CCSD)(T) method. Both hydrogen abstraction and displacement processes are carried out at the same level. Our results reveal that H-abstraction from the -OCH2- group is the dominant channel for CH3OCH2CH2Cl by OH radical or Cl atom, and from α-CH2 of the group CH3CH2- is predominate for the reaction CH3CH2OCH2CH2Cl with Cl/OH. The contribution of displacement processes may be unimportant due to the high barriers. The values of the calculated rate constants reproduce remarkably well the available experiment data. Standard enthalpies of formation for reactants and product radicals are calculated by isodesmic reactions. The Arrhenius expressions are given within 220-1200 K. The atmospheric lifetime, ozone depleting potential (ODP), ozone formation potential (OFP), and global warming potential (GWP) of CH3OCH2CH2Cl/CH3CH2OCH2CH2Cl are investigated. Meanwhile, the atmospheric fate of the alkoxy radicals are also researched using the same level of theory. To shed light on the atmospheric degradation, a mechanistic study is obtained, which indicates that reaction with O2 is the dominant path for the decomposition of CH3OCH(O•)CH2Cl, the C-C bond scission reaction is the primary reaction path in the consumption of CH3CH(O•)OCH2CH2Cl in the atmosphere. HIGHLIGHTS Ab initio method and canonical variational transition-state theory are employed to study the kinetic nature of hydrogen abstraction reactions of CH3OCH2CH2Cl/CH3CH2OCH2CH2Cl with Cl atom and OH radical and fate of alkoxy radicals (CH3OCH(O•)CH2Cl/CH3CH(O•)OCH2CH2Cl).
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Affiliation(s)
- Jin-Ting Ye
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
| | - Feng-Yang Bai
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China
| | - Xiu-Mei Pan
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024, Changchun, People's Republic of China.
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Meisner J, Kästner J. Atom Tunneling in Chemistry. Angew Chem Int Ed Engl 2016; 55:5400-13. [DOI: 10.1002/anie.201511028] [Citation(s) in RCA: 140] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 01/08/2016] [Indexed: 01/01/2023]
Affiliation(s)
- Jan Meisner
- Institut für Theoretische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Johannes Kästner
- Institut für Theoretische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
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Affiliation(s)
- Jan Meisner
- Institut für Theoretische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Johannes Kästner
- Institut für Theoretische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Deutschland
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Bai FY, Wang X, Sun YQ, Wang RS, Pan XM. Atmospheric chemistry of ethers, esters, and alcohols on the lifetimes, temperature dependence, and kinetic isotope effect: an example of CF3CX2CX2CX2OX with OX reactions (X = H, D). RSC Adv 2016. [DOI: 10.1039/c6ra04902h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Mechanisms and kinetics of the reaction of CF3CX2CX2CX2OX with OX (X= H, D) radical are investigated on a sound theoretical basis.
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Affiliation(s)
- Feng-Yang Bai
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- People's Republic of China
| | - Xu Wang
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- People's Republic of China
| | - Yan-Qiu Sun
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- People's Republic of China
| | - Rong-Shun Wang
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- People's Republic of China
| | - Xiu-Mei Pan
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- People's Republic of China
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Bai FY, Liu YJ, Wang X, Sun YQ, Pan XM. Atmospheric chemistry of CF3(CX2)2CH2OH: rate coefficients and temperature dependence of reactions with chlorine atoms and the subsequent pathways of alkyl and alkoxy radicals (X = H, F). RSC Adv 2016. [DOI: 10.1039/c6ra10840g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The atmospheric and kinetic properties of CF3(CX2)2CH2OH (X = H, F) with chlorine atoms were studied by density functional and canonical variational transition state theories in conjunction with the small-curvature tunneling correction.
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Affiliation(s)
- Feng-Yang Bai
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- 130024 Changchun
- People’s Republic of China
| | - You-Jun Liu
- Faculty of Physics
- Aviation University of Air Force
- 130022 Changchun
- People’s Republic of China
| | - Xu Wang
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- 130024 Changchun
- People’s Republic of China
| | - Yan-Qiu Sun
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- 130024 Changchun
- People’s Republic of China
| | - Xiu-Mei Pan
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- 130024 Changchun
- People’s Republic of China
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Bai FY, Wang X, Sun YQ, Pan XM. Atmospheric chemistry of alkyl iodides: theoretical studies on the mechanisms and kinetics of CH3I/C2H5I + NO3 reactions. RSC Adv 2015. [DOI: 10.1039/c5ra16215g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Mechanisms and kinetics of the reactions of the NO3 radical with CH3I and C2H5I have been investigated from a sound theoretical basis.
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Affiliation(s)
- Feng-Yang Bai
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- People's Republic of China
| | - Xu Wang
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- People's Republic of China
| | - Yan-Qiu Sun
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- People's Republic of China
| | - Xiu-Mei Pan
- Institute of Functional Material Chemistry
- Faculty of Chemistry
- Northeast Normal University
- Changchun
- People's Republic of China
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