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Snitsiriwat S, Yommee S, Bozzelli JW. Kinetic Analysis of Unimolecular Reactions Following the Addition of the Hydroxyl Radical to 1,1,2-Trifluoroethene. J Phys Chem A 2021; 125:5375-5384. [PMID: 34111923 DOI: 10.1021/acs.jpca.1c02390] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fluorinated olefins are valued chemicals in industry, especially as heat transfer fluids in refrigeration applications. As these volatile compounds are widely used, they may be released into the atmosphere, and investigation of their reactions in the atmosphere are therefore of importance. The kinetic analysis of the reaction mechanisms of trifluoroethene (CF2═CHF) with hydroxyl radicals is studied using computational chemistry at the M06-2X level with the 6-311++G(2d,d,p) and aug-cc-pVDZ basis sets as well as the composite CBS-QB3 method. Rate coefficients for the proposed mechanisms are calculated using transition state theory (TST) with tunneling corrections. The calculated rate constants for OH addition to CF2═CHF are in excellent agreement with experimental values. Kinetic parameters as a function of temperature and pressure are evaluated for the chemically activated formation and unimolecular dissociation of hydroxylfluoroalkyl intermediates. Important forward reactions result in adduct stabilization, H atoms, hydrogen fluoride (HF) via molecular elimination, and formation of fluorinated carbonyl radicals with CF2(═O) and CHF(═O) product channels. Stabilization of initial adducts along with HF elimination are important reaction pathways under high pressure and low temperatures. Important HF eliminations and H atom transfers primarily involve H atoms from the hydroxyl group, as the C-H bonds on or adjacent to carbons with F atoms are stronger and show high barriers to H atom transfer.
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Affiliation(s)
- Suarwee Snitsiriwat
- Department of Chemistry, Faculty of Science, Mahidol University, 272 Rama VI Road, Ratchathewi, Bangkok 10400, Thailand
| | - Suriyakit Yommee
- Faculty of Science and Technology, Thammasat University, 2 Prachan Road, Phra Nakhon District, Bangkok 10200, Thailand
| | - Joseph W Bozzelli
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
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2
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Bai FY, Deng MS, Chen MY, Kong L, Ni S, Zhao Z, Pan XM. Atmospheric oxidation of fluoroalcohols initiated by ˙OH radicals in the presence of water and mineral dusts: mechanism, kinetics, and risk assessment. Phys Chem Chem Phys 2021; 23:13115-13127. [PMID: 34075970 DOI: 10.1039/d1cp01324f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The transport and formation of fluorinated compounds are greatly significant due to their possible environmental risks. In this work, the ˙OH-mediated degradation of CF3CF2CF2CH2OH and CF3CHFCF2CH2OH in the presence of O2/NO/NO2 was studied by using density functional theory and the direct kinetic method. The formation mechanisms of perfluorocarboxylic/hydroperfluorocarboxylic acids (PFCAs/H-PFCAs), which were produced from the reactions of α-hydroxyperoxy radicals with NO/NO2 and the ensuing oxidation of α-hydroxyalkoxy radicals, were clarified and discussed. The roles of water and silica particles in the rate constants and ˙OH reaction mechanism with fluoroalcohols were investigated theoretically. The results showed that water and silica particles do not alter the reaction mechanism but obviously change the kinetic properties. Water could retard fluoroalcohol degradation by decreasing the rate constants by 3-5 orders of magnitude. However, the heterogeneous ˙OH-rate coefficients on the silica particle surfaces, including H4SiO4, H6Si2O7, and H12Si6O18, are larger than that of the naked reaction by 1.20-24.50 times. This finding suggested that these heterogeneous reactions may be responsible for the atmospheric loss of fluoroalcohols and the burden of PFCAs. In addition, fluoroalcohols could be exothermically trapped by H12Si6O18, H6Si2O7, and H4SiO4, in which the chemisorption on H12Si6O18 is stronger than that on H6Si2O7 or H4SiO4. The global warming potentials and radiative forcing of CF3CF2CF2CH2OH/CF3CHFCF2CH2OH were calculated to assess their contributions to the greenhouse effect. The toxicities of individual species were also estimated via the ECOSAR program and experimental measurements. This work enhances the understanding of the environmental formation of PFCAs and the transformation of fluoroalcohols.
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Affiliation(s)
- Feng-Yang Bai
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, Liaoning 110034, P. R. China.
| | - Ming-Shuai Deng
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, Liaoning 110034, P. R. China.
| | - Mei-Yan Chen
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, Liaoning 110034, P. R. China.
| | - Lian Kong
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, Liaoning 110034, P. R. China.
| | - Shuang Ni
- National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China.
| | - Zhen Zhao
- Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, Liaoning 110034, P. R. China. and State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Chang Ping, Beijing 102249, P. R. China
| | - Xiu-Mei Pan
- National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China.
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Atmospheric chemistry of CF3CHFCF2OCH2CF2CF3: Kinetics and mechanism on the OH-initiated degradation and subsequent reactions in the presence of O2 and NO. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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4
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Kumar A, Gonu S, Vijayakumar S, Ramya CB, Rajakumar B. Experimental and Computational Investigations of the Tropospheric Photooxidation Reactions of 1,1,1,3,3,3-Hexafluoro-2-Methyl-2-Propanol Initiated by OH Radicals and Cl Atoms. J Phys Chem A 2021; 125:523-535. [PMID: 33405922 DOI: 10.1021/acs.jpca.0c08130] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The gas-phase kinetics for the reactions of OH radicals and Cl atoms with 1,1,1,3,3,3-hexafluoro-2-methyl-2-propanol (HF2M2P) were measured at temperatures between 268 and 363 K using the relative rate experimental technique. Methane and acetonitrile were used as reference compounds to measure the rate coefficients of the title reactions. For the reactions of HF2M2P with OH radicals and Cl atoms, the rate coefficients were measured to be (7.07 ± 1.21) × 10-15 and (2.85 ± 0.54) × 10-14 cm3 molecule-1 s-1, respectively, at 298 K. The obtained Arrhenius expressions for the reactions of HF2M2P with OH radicals and Cl atoms are kHF2M2P + OHExp - (268 - 363 K) = (7.84 ± 0.75) × 10-14 exp [-(717 ± 59)/T] and kHF2M2P + ClExp - (268 - 363 K) = (3.21 ± 0.45) × 10-12 exp [-(1395 ± 83)/T] cm3 molecule-1 s-1. In addition to the experimental measurements, computational kinetic calculations were also performed for the title reactions at the M06-2X/MG3S//M06-2X/6-31 + G(d,p) level of theory using advanced methods such as the canonical variational transition-state theory coupled with small curvature tunneling corrections at temperatures between 200 and 400 K. Theoretical calculations reveal that the H-abstraction from the CH3 group is a more favorable reaction channel than that from the OH group. Thermochemistry, branching ratios, cumulative atmospheric lifetime, global warming potential, acidification potential, and photochemical ozone creation potential of HF2M2P were calculated in the present investigation.
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Affiliation(s)
- Avinash Kumar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - Srinivasulu Gonu
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - S Vijayakumar
- Department of Applied Chemistry, Samrat Ashok Technological Institute, Vidisha 464001, Madhya Pradesh, India
| | - C B Ramya
- 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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5
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Saghafi H, Vahedpour M, Douroudgari H. Complete degradation of glyoxal by NO radicals through two steps: The first at high-temperatures and the second at low-temperatures. COMPUT THEOR CHEM 2020. [DOI: 10.1016/j.comptc.2020.112822] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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6
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7
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Gour NK, Rajkumari NP, Deka RC, Paul S, Deka A. Atmospheric degradation pathways and kinetics of 2,2-difluoroethanol (CHF2CH2OH) with Cl atom: A theoretical investigation. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2018.11.063] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Paul S, Gour NK, Deka RC. Mechanistic investigation of the atmospheric oxidation of bis(2-chloroethyl) ether (ClCH2CH2OCH2CH2Cl) by OH and NO3 radicals and Cl atoms: a DFT approach. J Mol Model 2019; 25:43. [DOI: 10.1007/s00894-019-3923-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 01/03/2019] [Indexed: 10/27/2022]
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9
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Baidya B, Lily M, Chandra AK. Theoretical Insight into the Kinetics of H-Abstraction Reaction of CHF 2
CH 2
OH with OH Radical, Atmospheric Lifetime and Global Warming Potential. ChemistrySelect 2018. [DOI: 10.1002/slct.201800491] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Bidisha Baidya
- Centre for Advanced Studies in Chemistry; North-Eastern Hill University; Shillong 793 022 India
| | - Makroni Lily
- Centre for Advanced Studies in Chemistry; North-Eastern Hill University; Shillong 793 022 India
| | - Asit K. Chandra
- Centre for Advanced Studies in Chemistry; North-Eastern Hill University; Shillong 793 022 India
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10
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Ponnusamy S, Sandhiya L, Senthilkumar K. Atmospheric Oxidation Mechanism and Kinetics of Hydrofluoroethers, CH3OCF3, CH3OCHF2, and CHF2OCH2CF3, by OH Radical: A Theoretical Study. J Phys Chem A 2018; 122:4972-4982. [DOI: 10.1021/acs.jpca.8b01890] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S. Ponnusamy
- Department of Physics, Bharathiar University, Coimbatore 641 046, India
| | - L. Sandhiya
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, United States
| | - K. Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore 641 046, India
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11
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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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12
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Molecular insights for the HFO-1345fz +X (X = Cl, O3 or NO3) reaction and fate of alkoxy radicals initiated by Cl: DFT investigations. J Fluor Chem 2017. [DOI: 10.1016/j.jfluchem.2017.08.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Baidya B, Lily M, Chandra AK. Theoretical studies on atmospheric chemistry of CHF 2 CF 2 CH 2 OH: Reaction with OH radicals, lifetime and global warming potentials. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2017.09.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Lily M, Baidya B, Chandra AK. Theoretical studies on atmospheric chemistry of HFE-245mc and perfluoro-ethyl formate: Reaction with OH radicals, atmospheric fate of alkoxy radical and global warming potential. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2016.12.037] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Rao PK, Gejji SP. Kinetics and Mechanistic Investigations of Atmospheric Oxidation of HFO-1345fz by OH Radical: Insights from Theory. J Phys Chem A 2017; 121:595-607. [DOI: 10.1021/acs.jpca.6b11312] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pradeep Kumar Rao
- Department of Chemistry, Savitribai Phule Pune University, Pune 411007, India
| | - Shridhar P. Gejji
- Department of Chemistry, Savitribai Phule Pune University, Pune 411007, India
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16
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Bao JL, Truhlar DG. Variational transition state theory: theoretical framework and recent developments. Chem Soc Rev 2017; 46:7548-7596. [DOI: 10.1039/c7cs00602k] [Citation(s) in RCA: 207] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This article reviews the fundamentals of variational transition state theory (VTST), its recent theoretical development, and some modern applications.
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Affiliation(s)
- Junwei Lucas Bao
- Department of Chemistry
- Chemical Theory Center, and Minnesota Supercomputing Institute
- University of Minnesota
- Minneapolis
- USA
| | - Donald G. Truhlar
- Department of Chemistry
- Chemical Theory Center, and Minnesota Supercomputing Institute
- University of Minnesota
- Minneapolis
- USA
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17
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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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18
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Rate coefficients for hydrogen abstraction reaction of pinonaldehyde (C10H16O2) with Cl atoms between 200 and 400 K: A DFT study. J CHEM SCI 2016. [DOI: 10.1007/s12039-016-1075-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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19
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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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20
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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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21
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Dash MR, Rajakumar B. Theoretical investigations of the gas phase reaction of limonene (C 10H 16) with OH radical. Mol Phys 2015. [DOI: 10.1080/00268976.2015.1014002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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22
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Ramanjaneyulu C, Rajakumar B. Kinetic parameters for the reaction of OH radical with cis-CHFCHCHF2, trans-CHFCHCHF2, CF2CHCHF2 and CF2CCHF: Hybrid meta DFT and CVT/SCT/ISPE calculations. J Fluor Chem 2015. [DOI: 10.1016/j.jfluchem.2015.08.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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23
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Srinivasulu G, Rajakumar B. Gas Phase Kinetics of 2,2,2-Trifluoroethylbutyrate with the Cl Atom: An Experimental and Theoretical Study. J Phys Chem A 2015; 119:9294-306. [DOI: 10.1021/acs.jpca.5b03961] [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)
- G. Srinivasulu
- 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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24
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Theoretical studies on atmospheric chemistry of (CF3)2C(OH)CH3: Kinetics, mechanism and thermochemistry of gas phase reactions with OH radicals. J Fluor Chem 2015. [DOI: 10.1016/j.jfluchem.2015.04.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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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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26
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Parandaman A, Balaganesh M, Rajakumar B. Experimental and theoretical study on thermal decomposition of methyl butanoate behind reflected shock waves. RSC Adv 2015. [DOI: 10.1039/c5ra16977a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The rate coefficients for total decomposition of MB in the temperature range of 1229–1427 K, were reported.
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Affiliation(s)
- A. Parandaman
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600036
- India
| | - M. Balaganesh
- 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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27
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Begum S, Subramanian R. Reaction of chlorine radical with tetrahydrofuran: a theoretical investigation on mechanism and reactivity in gas phase. J Mol Model 2014; 20:2262. [PMID: 24867438 DOI: 10.1007/s00894-014-2262-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Accepted: 04/23/2014] [Indexed: 10/25/2022]
Abstract
Reaction of chlorine (Cl) radical with heterocyclic saturated ether, tetrahydrofuran has been studied. The detailed reactivity and mechanism of this reaction is analyzed using hybrid density functional theory (DFT), B3LYP and BB1K methods, and aug-cc-pVTZ basis set. To explore the mechanism of the reaction of tetrahydrofuran with Cl radical, four possible sites of hydrogen atom (H) abstraction pathways in tetrahydrofuran were analyzed. The barrier height and rate constants are calculated for the four H-abstraction channels. The BB1K calculated rate constant for α-axial H-abstraction is comparable with the experimentally determined rate constant. It reflects that α-axial H-abstraction is the main degradation pathway of tetrahydrofuran with Cl radical. DFT-based reactivity descriptors are also calculated and these values describe α-axial H-abstraction as the main reaction channel.
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Affiliation(s)
- Samiyara Begum
- Department of Chemistry, Indian Institute of Technology, Patna, India, 800013
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28
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Kinetics, mechanism and thermochemistry of the gas phase reactions of CF3CH2OCH2CF3 with OH radicals: A theoretical study. J Fluor Chem 2014. [DOI: 10.1016/j.jfluchem.2014.02.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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29
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Mishra BK, Lily M, Chakrabartty AK, Bhattacharjee D, Deka RC, Chandra AK. Theoretical investigation of atmospheric chemistry of volatile anaesthetic sevoflurane: reactions with the OH radicals and atmospheric fate of the alkoxy radical (CF3)2CHOCHFO: thermal decomposition vs. oxidation. NEW J CHEM 2014. [DOI: 10.1039/c3nj01408h] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reaction profile (kcal mol−1) for (CF3)2CHOCHFO radical at the M06-2X/6-311++G(d,p) level.
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Affiliation(s)
| | - Makroni Lily
- Department of Chemistry
- North-Eastern Hill University
- Shillong, India
| | | | | | | | - Asit K. Chandra
- Department of Chemistry
- North-Eastern Hill University
- Shillong, India
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