1
|
Roscoe JM. A kinetic study of the reactions of atomic bromine with the trimethylbenzenes. Phys Chem Chem Phys 2023; 25:28948-28954. [PMID: 37855665 DOI: 10.1039/d3cp04030e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2023]
Abstract
This work presents the results of kinetic measurements for the reactions of atomic bromine with the three isomers of trimethylbenzene at temperatures from 295 K to 354 K and at pressures close to atmospheric. The atomic bromine was produced by photolysis of Br2 in a thermostated Pyrex chamber as described in our previous work. The reactants were present as dilute mixtures in argon with Br2 in sufficient excess to scavenge the free radical products of the initiation step. Chemical analysis was by gas chromatography and the rate coefficients were calculated from the chromatographic results using the relative rate method. The experimentally measured temperature dependence of the rate coefficients for the reactions of Br with the trimethylbenzenes is given in the units cm3 molec.-1 s-1 by: 1,2,3-trimethylbenzene + Br, log10(k) = -9.57 ± 0.43 - (996 ± 134)/T; 1,2,4-trimethylbenzene + Br, log10(k) = -9.74 ± 0.29 - (968 ± 91)/T; 1,3,5-trimethylbenzene + Br, log10(k) = -9.87 ± 0.26 - (1079 ± 85)/T. The enthalpies and entropies of activation for these reactions are compared to those for the reactions of Br with toluene and the xylenes.
Collapse
Affiliation(s)
- John M Roscoe
- Department of Chemistry, Acadia University, Wolfville, Nova Scotia, B4P 2R6, Canada.
| |
Collapse
|
2
|
Giri BR, Farooq A, Szőri M, Roscoe JM. The kinetics of the reactions of Br atoms with the xylenes: an experimental and theoretical study. Phys Chem Chem Phys 2022; 24:4843-4858. [PMID: 35080539 DOI: 10.1039/d1cp03740d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work reports the temperature dependence of the rate coefficients for the reactions of atomic bromine with the xylenes that are determined experimentally and theoretically. The experiments were carried out in a Pyrex chamber equipped with fluorescent lamps to measure the rate coefficients at temperatures from 295 K to 346 K. Experiments were made at several concentrations of oxygen to assess its potential kinetic role under atmospheric conditions and to validate comparison of our rate coefficients with those obtained by others using air as the diluent. Br2 was used to generate Br atoms photolytically. The relative rate method was used to obtain the rate coefficients for the reactions of Br atoms with the xylenes. The reactions of Br with both toluene and diethyl ether (DEE) were used as reference reactions where the loss of the organic reactants was measured by gas chromatography. The rate coefficient for the reaction of Br with diethyl ether was also measured in the same way over the same temperature range with toluene as the reference reactant. The rate coefficients were independent of the concentration of O2. The experimentally determined temperature dependence of the rate coefficients of these reactions can be given in the units cm3 molecule-1 s-1 by: o-xylene + Br, log10(k) = (-10.03 ± 0.35) - (921 ± 110)/T; m-xylene + Br, log10(k) = (-10.78 ± 0.09) - (787 ± 92/T); p-xylene + Br, log10(k) = (-9.98 ± 0.39) - (956 ± 121)/T; diethyl ether + Br, log10(k) = (-7.69 ± 0.55) - (1700 ± 180)/T). This leads to the following rate coefficients, in the units of cm3 molecule-1 s-1, based on our experimental measurements: o-xylene + Br, k(298 K) = 7.53 × 10-14; m-xylene + Br, k(298 K) = 3.77 × 10-14; p-xylene + Br, k(298 K) = 6.43 × 10-14; diethyl ether + Br, k(298 K) = 4.02 × 10-14. Various ab initio methods including G3, G4, CCSD(T)/cc-pV(D,T)Z//MP2/aug-cc-pVDZ and CCSD(T)/cc-pV(D,T)Z//B3LYP/cc-pVTZ levels of theory were employed to gain detailed information about the kinetics as well as the thermochemical quantities. Among the ab initio methods, the G4 method performed remarkably well in describing the kinetics and thermochemistry of the xylenes + Br reaction system. Our theoretical calculations revealed that the reaction of Br atoms with the xylenes proceeds via a complex forming mechanism in an overall endothermic reaction. The rate determining step is the intramolecular rearrangement of the pre-reactive complex leading to the post-reactive complex. After lowering the relative energy of the corresponding transition state by less than 1.5 kJ mol-1 for this step in the reaction of each of the xylenes with Br, the calculated rate coefficients are in very good agreement with the experimental data.
Collapse
Affiliation(s)
- Binod R Giri
- King Abdullah University of Science and Technology (KAUST), Clean Combustion Research Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Saudi Arabia.
| | - Aamir Farooq
- King Abdullah University of Science and Technology (KAUST), Clean Combustion Research Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Saudi Arabia.
| | - Milán Szőri
- Institute of Chemistry, Faculty of Materials Science and Engineering, University of Miskolc, Egyetemváros A/4, H-3515 Miskolc, Hungary
| | - John M Roscoe
- Department of Chemistry, Acadia University, Wolfville, Nova Scotia, B4P 2R6, Canada.
| |
Collapse
|
3
|
Grira A, Antiñolo M, Canosa A, Tomas A, Jiménez E, El Dib G. An experimental study of the gas-phase reaction between Cl atoms and trans-2-pentenal: Kinetics, products and SOA formation. CHEMOSPHERE 2021; 276:130193. [PMID: 34088089 DOI: 10.1016/j.chemosphere.2021.130193] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 02/26/2021] [Accepted: 03/02/2021] [Indexed: 06/12/2023]
Abstract
The gas-phase reaction of trans-2-pentenal (T2P) with Cl atoms was studied at atmospheric pressure and room temperature. A rate coefficient of (2.56 ± 0.83) × 10-10 cm3 molecule-1 s-1 was obtained using the relative rate method and isoprene, cyclohexane and ethanol as reference compounds. The kinetic study was carried out using a 300-L Teflon bag simulation chamber (IMT Lille Douai-France) and a 16-L Pyrex cell (UCLM-Ciudad Real-Spain), both coupled to the Fourier transform infrared (FTIR) technique. Gas-phase products and secondary organic aerosol (SOA) formation were studied at UCLM using a 16-L Pyrex cell and a 264-L quartz simulation chamber coupled to the FTIR and gas-chromatography-mass spectrometry (GC-MS) techniques. HCl, CO, and propanal were identified as products formed from the studied reaction and quantified by FTIR, the molar yield of the latter being (5.2 ± 0.2)%. Formic acid was identified as a secondary product and was quantified by FTIR with a yield of (6.2 ± 0.4)%. In addition, 2-chlorobutanal and 2-pentenoic acid were identified, but not quantified, by GC-MS as products. The SOA formation was investigated using a fast mobility particle sizer spectrometer. The observed SOA yields reached maximum values of around 7% at high particle mass concentrations. This work provides the first study of the formation of gaseous and particulate products for the reaction of Cl with T2P. A reaction mechanism is suggested to explain the formation of the observed gaseous products. The results are discussed in terms of structure-reactivity relationship, and the atmospheric implications derived from this study are commented as well.
Collapse
Affiliation(s)
- Asma Grira
- CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, Université de Rennes, F-35000, Rennes, France; IMT Lille Douai, Institut Mines-Télécom, Univ. Lille, Center for Energy and Environment, F-59000, Lille, France
| | - María Antiñolo
- Departamento de Química Física, Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, Avda. Camilo José Cela 1B, E-13071, Ciudad Real, Spain; Instituto de Investigación en Combustión y Contaminación Atmosférica (ICCA), Universidad de Castilla-La Mancha, Camino de Moledores S/n, E-13071, Ciudad Real, Spain.
| | - André Canosa
- CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, Université de Rennes, F-35000, Rennes, France
| | - Alexandre Tomas
- IMT Lille Douai, Institut Mines-Télécom, Univ. Lille, Center for Energy and Environment, F-59000, Lille, France
| | - Elena Jiménez
- Departamento de Química Física, Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, Avda. Camilo José Cela 1B, E-13071, Ciudad Real, Spain; Instituto de Investigación en Combustión y Contaminación Atmosférica (ICCA), Universidad de Castilla-La Mancha, Camino de Moledores S/n, E-13071, Ciudad Real, Spain
| | - Gisèle El Dib
- CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, Université de Rennes, F-35000, Rennes, France.
| |
Collapse
|
4
|
Davis JC, Koritzke AL, Caravan RL, Antonov IO, Christianson MG, Doner AC, Osborn DL, Sheps L, Taatjes CA, Rotavera B. Influence of the Ether Functional Group on Ketohydroperoxide Formation in Cyclic Hydrocarbons: Tetrahydropyran and Cyclohexane. J Phys Chem A 2019; 123:3634-3646. [PMID: 30865470 DOI: 10.1021/acs.jpca.8b12510] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Photolytically initiated oxidation experiments were conducted on cyclohexane and tetrahydropyran using multiplexed photoionization mass spectrometry to assess the impact of the ether functional group in the latter species on reaction mechanisms relevant to autoignition. Pseudo-first-order conditions, with [O2]0:[R•]0 > 2000, were used to ensure that R• + O2 → products were the dominant reactions. Quasi-continuous, tunable vacuum ultraviolet light from a synchrotron was employed over the range 8.0-11.0 eV to measure photoionization spectra of the products at two pressures (10 and 1520 Torr) and three temperatures (500, 600, and 700 K). Photoionization spectra of ketohydroperoxides were measured in both species and were qualitatively identical, within the limit of experimental noise, to those of analogous species formed in n-butane oxidation. However, differences were noted in the temperature dependence of ketohydroperoxide formation between the two species. Whereas the yield from cyclohexane is evident up to 700 K, ketohydroperoxides in tetrahydropyran were not detected above 650 K. The difference indicates that reaction mechanisms change due to the ether group, likely affecting the requisite •QOOH + O2 addition step. Branching fractions of nine species from tetrahydropyran were quantified with the objective of determining the role of ring-opening reactions in diminishing ketohydroperoxide. The results indicate that products formed from unimolecular decomposition of R• and •QOOH radicals via concerted C-C and C-O β-scission are pronounced in tetrahydropyran and are insignificant in cyclohexane oxidation. The main conclusion drawn is that, under the conditions herein, ring-opening pathways reduce the already low steady-state concentration of •QOOH, which in the case of tetrahydropyran prevents •QOOH + O2 reactions necessary for ketohydroperoxide formation. Carbon balance calculations reveal that products from ring opening of both R• and •QOOH, at 700 K, account for >70% at 10 Torr and >55% at 1520 Torr. Three pathways are confirmed to contribute to the depletion of •QOOH in tetrahydropyran including (i) γ-•QOOH → pentanedial + •OH, (ii) γ-•QOOH → vinyl formate + ethene + •OH, and (iii) γ-•QOOH → 3-butenal + formaldehyde + •OH. Analogous mechanisms in cyclohexane oxidation leading to similar intermediates are compared and, on the basis of mass spectral results, confirm that no such ring-opening reactions occur. The implication from the comparison to cyclohexane is that the ether group in tetrahydropyran increases the propensity for ring-opening reactions and inhibits the formation of ketohydroperoxide isomers that precede chain-branching. On the contrary, the absence of such reactions in cyclohexane enables ketohydroperoxide formation up to 700 K and perhaps higher temperature.
Collapse
Affiliation(s)
| | | | - Rebecca L Caravan
- Combustion Research Facility , Sandia National Laboratories , Livermore , California 94551 , United States
| | - Ivan O Antonov
- Combustion Research Facility , Sandia National Laboratories , Livermore , California 94551 , United States
| | | | | | - David L Osborn
- Combustion Research Facility , Sandia National Laboratories , Livermore , California 94551 , United States
| | - Leonid Sheps
- Combustion Research Facility , Sandia National Laboratories , Livermore , California 94551 , United States
| | - Craig A Taatjes
- Combustion Research Facility , Sandia National Laboratories , Livermore , California 94551 , United States
| | | |
Collapse
|
5
|
Ring-Size Effects on the Stability and Spectral Shifts of Hydrogen Bonded Cyclic Ethers Complexes. Sci Rep 2018; 8:1553. [PMID: 29367625 PMCID: PMC5784011 DOI: 10.1038/s41598-017-18191-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 12/07/2017] [Indexed: 11/08/2022] Open
Abstract
In order to investigate ring-size effects on the stability and spectral shifts of hydrogen bonded cyclic ethers complexes, the strength of hydrogen bonds in gas phase complexes formed between 2,2,2-trifluoroethanol (TFE) and selected cyclic ethers were examined using FTIR spectroscopy. TFE was chosen as hydrogen bond donor in these complexes, while trimethylene oxide (TMO), tetrahydrofuran (THF) and tetrahydropyran (THP) were selected as hydrogen bond acceptors. Comparable OH-stretching red shifts were observed in the three kinds of complexes. The difference of red shifts is so small (<7 cm−1) for TFE−TMO/THF/THP complexes that one can conclude that their stabilities and the strength of the hydrogen bonds are nearly similar and do not show any marked dependence with the ring size of the hydrogen bond acceptor. The equilibrium constants for the complexation were determined, and atoms-in-molecules (AIM) and natural bond orbital (NBO) analyses were performed to further investigate the intermolecular interactions. Regardless of the ring size, hydrogen bonds in the complexes showed similar strength, in agreement with the observed OH-stretching red shifts.
Collapse
|
6
|
Ballesteros B, Jiménez E, Moreno A, Soto A, Antiñolo M, Albaladejo J. Atmospheric fate of hydrofluoroolefins, C xF 2x+1CHCH 2 (x = 1,2,3,4 and 6): Kinetics with Cl atoms and products. CHEMOSPHERE 2017; 167:330-343. [PMID: 27736711 DOI: 10.1016/j.chemosphere.2016.09.156] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 09/20/2016] [Accepted: 09/30/2016] [Indexed: 06/06/2023]
Abstract
Rate coefficients for the gas-phase reactions of CxF2x+1CHCH2 (x = 1, 2, 3, 4 and 6) with Cl atoms were determined at (298 ± 2) K and (710 ± 5) Torr of air using a relative rate technique. Two experimental setups with simulation chambers were employed with Fourier Transform Infrared (FTIR) spectroscopy and Gas Chromatography coupled to Mass Spectrometry (GC-MS) as detection techniques. The Cl-rate coefficients obtained were (in 10-10 cm3 molecule-1 s-1): (0.85 ± 0.11) for CF3CHCH2, (1.11 ± 0.08) for C2F5CHCH2, (1.12 ± 0.18) for C3F7CHCH2, (0.97 ± 0.09) for C4F9CHCH2, and (0.99 ± 0.08) for C6F13CHCH2. Additionally, the gas-phase products were identified and quantified, when possible, by FTIR spectroscopy or GC-MS. The main reaction product was reported to be CxF2x+1C(O)CH2Cl. The fluorinated species, CxF2x+1CHO and CxF2x+1C(O)CH2Cl, were identified. CF3C(O)CH2Cl and CF3CHO were found to be formed with molar yield of (69 ± 5)% and (9 ± 1)%, respectively. The global lifetime of the investigated CxF2x+1CHCH2 due to their Cl-reaction is more than 100 days so this route does not compete with the removal by OH radicals. This lifetime is long enough for CxF2x+1CHCH2 to be transported to remote areas where they can be degraded. However, at a local scale, in marine regions at dawn the removal of CxF2x+1CHCH2 is expected to occur in ca. 1 day. The atmospheric degradation of these hydrofluoroolefins by Cl atoms is not expected to be a source of bioaccumulative perfluorinated carboxylic acids, CxF2x+1C(O)OH. Additionally, the UV absorption cross sections of CF3C(O)CH2Cl were determined together with the rate coefficient of the OH reaction by an absolute kinetic method at room temperature.
Collapse
Affiliation(s)
- Bernabé Ballesteros
- Departamento de Química Física, Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, Avenida Camilo José Cela 1B, 13071 Ciudad Real, Spain; Instituto de Investigación en Combustión y Contaminación Atmosférica, Universidad de Castilla-La Mancha, Camino de Moledores s/n, 13071 Ciudad Real, Spain.
| | - Elena Jiménez
- Departamento de Química Física, Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, Avenida Camilo José Cela 1B, 13071 Ciudad Real, Spain; Instituto de Investigación en Combustión y Contaminación Atmosférica, Universidad de Castilla-La Mancha, Camino de Moledores s/n, 13071 Ciudad Real, Spain
| | - Alberto Moreno
- Instituto de Investigación en Combustión y Contaminación Atmosférica, Universidad de Castilla-La Mancha, Camino de Moledores s/n, 13071 Ciudad Real, Spain
| | - Amparo Soto
- Instituto de Investigación en Combustión y Contaminación Atmosférica, Universidad de Castilla-La Mancha, Camino de Moledores s/n, 13071 Ciudad Real, Spain
| | - María Antiñolo
- Instituto de Investigación en Combustión y Contaminación Atmosférica, Universidad de Castilla-La Mancha, Camino de Moledores s/n, 13071 Ciudad Real, Spain
| | - José Albaladejo
- Departamento de Química Física, Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha, Avenida Camilo José Cela 1B, 13071 Ciudad Real, Spain; Instituto de Investigación en Combustión y Contaminación Atmosférica, Universidad de Castilla-La Mancha, Camino de Moledores s/n, 13071 Ciudad Real, Spain
| |
Collapse
|
7
|
Antonov IO, Zádor J, Rotavera B, Papajak E, Osborn DL, Taatjes CA, Sheps L. Pressure-Dependent Competition among Reaction Pathways from First- and Second-O2 Additions in the Low-Temperature Oxidation of Tetrahydrofuran. J Phys Chem A 2016; 120:6582-95. [DOI: 10.1021/acs.jpca.6b05411] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ivan O. Antonov
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Judit Zádor
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Brandon Rotavera
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Ewa Papajak
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - David L. Osborn
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Craig A. Taatjes
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Leonid Sheps
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| |
Collapse
|
8
|
Ballesteros B, Ceacero-Vega AA, Jiménez E, Albaladejo J. Atmospheric reactions of methylcyclohexanes with Cl atoms and OH radicals: determination of rate coefficients and degradation products. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:4806-4819. [PMID: 24788931 DOI: 10.1007/s11356-014-2901-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Accepted: 04/07/2014] [Indexed: 06/03/2023]
Abstract
As the result of biogenic and anthropogenic activities, large quantities of chemical compounds are emitted into the troposphere. Alkanes, in general, and cycloalkanes are an important chemical class of hydrocarbons found in diesel, jet and gasoline, vehicle exhaust emissions, and ambient air in urban areas. In general, the primary atmospheric fate of organic compounds in the gas phase is the reaction with hydroxyl radicals (OH). The oxidation by Cl atoms has gained importance in the study of atmospheric reactions because they may exert some influence in the boundary layer, particularly in marine and coastal environments, and in the Arctic troposphere. The aim of this paper is to study of the atmospheric reactivity of methylcylohexanes with Cl atoms and OH radicals under atmospheric conditions (in air at room temperature and pressure). Relative kinetic techniques have been used to determine the rate coefficients for the reaction of Cl atoms and OH radicals with methylcyclohexane, cis-1,4-dimethylcyclohexane, trans-1,4-dimethylcyclohexane, and 1,3,5-trimethylcyclohexane at 298 ± 2 K and 720 ± 5 Torr of air by Fourier transform infrared) spectroscopy and gas chromatography-mass spectrometry (GC-MS) in two atmospheric simulation chambers. The products formed in the reaction under atmospheric conditions were investigated using a 200-L Teflon bag and employing the technique of solid-phase microextraction coupled to a GC-MS. The rate coefficients obtained for the reaction of Cl atoms with the studied compounds are the following ones (in units of 10(-10) cm(3) molecule(-1) s(-1)): (3.11 ± 0.16), (2.89 ± 0.16), (2.89 ± 0.26), and (2.61 ± 0.42), respectively. For the reactions with OH radicals the determined rate coefficients are (in units of 10(-11) cm(3) molecule(-1) s(-1)): (1.18 ± 0.12), (1.49 ± 0.16), (1.41 ± 0.15), and (1.77 ± 0.23), respectively. The reported error is twice the standard deviation. A detailed mechanism for ring-retaining product channels is proposed to justify the observed reaction products. The global tropospheric lifetimes estimated from the reported OH- and Cl-rate coefficients show that the main removal path for the investigated methylcyclohexanes is the reaction with OH radicals. But in marine environments, after sunrise, Cl reactions become more important in the tropospheric degradation. Thus, the estimated lifetimes range from 16 to 24 h for the reactions of the OH radical (calculated with [OH] = 10(6) atoms cm(-3)) and around 7-8 h in the reactions with Cl atoms in marine environments (calculated with [Cl] = 1.3 × 10(5) atoms cm(-3)). The reaction of Cl atoms and OH radicals and methylcylohexanes can proceed by H abstraction from the different positions.
Collapse
Affiliation(s)
- Bernabé Ballesteros
- Department of Physical Chemistry, Faculty of Chemical Sciences and Technologies, University of Castilla-La Mancha, Avda. Camilo José Cela s/n, 13071, Ciudad Real, Spain
| | | | | | | |
Collapse
|
9
|
Sleiman C, El Dib G, Ballesteros B, Moreno A, Albaladejo J, Canosa A, Chakir A. Kinetics and Mechanism of the Tropospheric Reaction of 3-Hydroxy-3-methyl-2-butanone with Cl Atoms. J Phys Chem A 2014; 118:6163-70. [DOI: 10.1021/jp5054343] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- C. Sleiman
- Département
de Physique Moléculaire, Institut de Physique
de Rennes, UMR 6251 du CNRS - Université de Rennes 1, Bat. 11C, Campus de Beaulieu, 35042 Rennes Cedex, France
| | - G. El Dib
- Département
de Physique Moléculaire, Institut de Physique
de Rennes, UMR 6251 du CNRS - Université de Rennes 1, Bat. 11C, Campus de Beaulieu, 35042 Rennes Cedex, France
| | - B. Ballesteros
- Facultad
de Ciencias
y Tecnologías Químicas, Departamento de
Química Física, Universidad de Castilla La Mancha, , Campus Universitario, 13071 Ciudad Real, Spain
| | - A. Moreno
- Facultad
de Ciencias
y Tecnologías Químicas, Departamento de
Química Física, Universidad de Castilla La Mancha, , Campus Universitario, 13071 Ciudad Real, Spain
| | - J. Albaladejo
- Facultad
de Ciencias
y Tecnologías Químicas, Departamento de
Química Física, Universidad de Castilla La Mancha, , Campus Universitario, 13071 Ciudad Real, Spain
| | - A. Canosa
- Département
de Physique Moléculaire, Institut de Physique
de Rennes, UMR 6251 du CNRS - Université de Rennes 1, Bat. 11C, Campus de Beaulieu, 35042 Rennes Cedex, France
| | - A. Chakir
- Laboratoire
GSMA-UMR 6089 CNRS, Université de Reims, Campus Moulin de la Housse, BP
1039, 51687 Reims Cedex 02, France
| |
Collapse
|
10
|
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.
Collapse
Affiliation(s)
- Samiyara Begum
- Department of Chemistry, Indian Institute of Technology, Patna, India, 800013
| | | |
Collapse
|
11
|
Alwe HD, Walawalkar M, Sharma A, Pushpa KK, Dhanya S, Naik PD. Rate Coefficients for the Gas-Phase Reactions of Chlorine Atoms with Cyclic Ethers at 298 K. INT J CHEM KINET 2013. [DOI: 10.1002/kin.20765] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- H. D. Alwe
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Trombay; Mumbai; 400 085; India
| | - M. Walawalkar
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Trombay; Mumbai; 400 085; India
| | - A. Sharma
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Trombay; Mumbai; 400 085; India
| | - K. K. Pushpa
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Trombay; Mumbai; 400 085; India
| | - S. Dhanya
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Trombay; Mumbai; 400 085; India
| | - P. D. Naik
- Radiation & Photochemistry Division; Bhabha Atomic Research Centre; Trombay; Mumbai; 400 085; India
| |
Collapse
|
12
|
Ceacero-Vega AA, Ballesteros B, Bejan I, Barnes I, Jiménez E, Albaladejo J. Kinetics and Mechanisms of the Tropospheric Reactions of Menthol, Borneol, Fenchol, Camphor, and Fenchone with Hydroxyl Radicals (OH) and Chlorine Atoms (Cl). J Phys Chem A 2012; 116:4097-107. [DOI: 10.1021/jp212076g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Antonio A. Ceacero-Vega
- Departamento de Química
Física, Facultad de Ciencias y Tecnología Química, Universidad de Castilla-La Mancha, Avenida Camilo José
Cela, s/n. 13071 Ciudad Real, Spain
| | - Bernabé Ballesteros
- Departamento de Química
Física, Facultad de Ciencias y Tecnología Química, Universidad de Castilla-La Mancha, Avenida Camilo José
Cela, s/n. 13071 Ciudad Real, Spain
| | - Iustinian Bejan
- FB-C Physical Chemistry Department, University of Wuppertal, Gauss Strasse 20, 42119 Wuppertal,
Germany
| | - Ian Barnes
- FB-C Physical Chemistry Department, University of Wuppertal, Gauss Strasse 20, 42119 Wuppertal,
Germany
| | - Elena Jiménez
- Departamento de Química
Física, Facultad de Ciencias y Tecnología Química, Universidad de Castilla-La Mancha, Avenida Camilo José
Cela, s/n. 13071 Ciudad Real, Spain
| | - José Albaladejo
- Departamento de Química
Física, Facultad de Ciencias y Tecnología Química, Universidad de Castilla-La Mancha, Avenida Camilo José
Cela, s/n. 13071 Ciudad Real, Spain
| |
Collapse
|
13
|
Ceacero-Vega AA, Ballesteros B, Bejan I, Barnes I, Albaladejo J. Daytime Reactions of 1,8-Cineole in the Troposphere. Chemphyschem 2011; 12:2145-54. [DOI: 10.1002/cphc.201100077] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Revised: 05/03/2011] [Indexed: 11/07/2022]
|
14
|
Giri BR, Roscoe JM, González-García N, Olzmann M, Lo JMH, Marriott RA. Experimental and theoretical investigation of the kinetics of the reaction of atomic chlorine with 1,4-dioxane. J Phys Chem A 2011; 115:5105-11. [PMID: 21526862 DOI: 10.1021/jp201803g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The rate coefficients for the reaction of 1,4-dioxane with atomic chlorine were measured from T = 292-360 K using the relative rate method. The reference reactant was isobutane and the experiments were made in argon with atomic chlorine produced by photolysis of small concentrations of Cl2. The rate coefficients were put on an absolute basis by using the published temperature dependence of the absolute rate coefficients for the reference reaction. The rate coefficients for the reaction of Cl with 1,4-dioxane were found to be independent of total pressure from p = 290 to 782 Torr. The experimentally measured rate coefficients showed a weak temperature dependence, given by k(exp)(T) = (8.4(-2.3)(+3.1)) × 10(-10) exp(-(470 ± 110)/(T/K)) cm3 molecule (-1) s(-1). The experimental results are rationalized in terms of statistical rate theory on the basis of molecular data obtained from quantum-chemical calculations. Molecular geometries and frequencies were obtained from MP2/aug-cc-pVDZ calculations, while single-point energies of the stationary points were computed at CCSD(T) level of theory. The calculations indicate that the reaction proceeds by an overall exothermic addition-elimination mechanism via two intermediates, where the rate-determining step is the initial barrier-less association reaction between the chlorine atom and the chair conformer of 1,4-dioxane. This is in contrast to the Br plus 1,4-dioxane reaction studied earlier, where the rate-determining step is a chair-to-boat conformational change of the bromine-dioxane adduct, which is necessary for this reaction to proceed. The remarkable difference in the kinetic behavior of the reactions of 1,4-dioxane with these two halogen atoms can be consistently explained by this change in the reaction mechanism.
Collapse
Affiliation(s)
- Binod R Giri
- Department of Chemistry, Acadia University, Wolfville, NS, Canada
| | | | | | | | | | | |
Collapse
|
15
|
Herbinet O, Bax S, Glaude PA, Carré V, Battin-Leclerc F. Mass spectra of cyclic ethers formed in the low-temperature oxidation of a series of n-alkanes. FUEL (LONDON, ENGLAND) 2011; 90:528-535. [PMID: 24092947 PMCID: PMC3787300 DOI: 10.1016/j.fuel.2010.09.047] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Cyclic ethers are important intermediate species formed during the low-temperature oxidation of hydrocarbons. Along with ketones and aldehydes, they could consequently represent a significant part of the heavy oxygenated pollutants observed in the exhaust gas of engines. Apart a few of them such as ethylene oxide and tetrahydrofuran, cyclic ethers have not been much studied and very few of them are available for calibration and identification. Electron impact mass spectra are available for very few of them, making their detection in the exhaust emissions of combustion processes very difficult. The main goal of this study was to complete the existing set of mass spectra for this class of molecules. Thus cyclic ethers have been analyzed in the exhaust gases of a jet-stirred reactor in which the low-temperature oxidation of a series of n-alkanes was taking place. Analyzes were performed by gas chromatography coupled to mass spectrometry and to MS/MS. The second goal of this study was to derive some rules for the fragmentation of cyclic ethers in electron impact mass spectrometry and allow the identification of these species when no mass spectrum is available.
Collapse
Affiliation(s)
- Olivier Herbinet
- Laboratoire Réactions et Génie des Procédés, Nancy Université, CNRS UPR 3349, BP 20451, 1 rue Grandville, 54000 Nancy, France
| | - Sarah Bax
- Laboratoire Réactions et Génie des Procédés, Nancy Université, CNRS UPR 3349, BP 20451, 1 rue Grandville, 54000 Nancy, France
| | - Pierre-Alexandre Glaude
- Laboratoire Réactions et Génie des Procédés, Nancy Université, CNRS UPR 3349, BP 20451, 1 rue Grandville, 54000 Nancy, France
| | - Vincent Carré
- Laboratoire de Spectrométrie de Masse et de Chimie Laser, Institut Jean Barriol–Fédération de Recherche 2843, Université Paul Verlaine–Metz, 1, Boulevard Arago, 57078 Metz,Technopole Cedex 03, France
| | - Frédérique Battin-Leclerc
- Laboratoire Réactions et Génie des Procédés, Nancy Université, CNRS UPR 3349, BP 20451, 1 rue Grandville, 54000 Nancy, France
| |
Collapse
|
16
|
Moriarty J, Wenger JC, Sidebottom HW. Product study of the OH radical and Cl atom initiated oxidation of 1,3-dioxane. Chemphyschem 2010; 11:3980-6. [PMID: 20949582 DOI: 10.1002/cphc.201000503] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The products of the hydroxyl (OH) radical and chlorine (Cl) atom initiated oxidation of 1,3-dioxane are determined under various reaction conditions in a 50 L teflon reaction chamber using FTIR spectroscopy for analysis. The major products detected in all experiments are (2-oxoethoxy)methyl formate, formic acid and methylene glycol diformate with average molar yields of 0.50±0.05, 0.41±0.02 and 0.03±0.01 respectively for the OH initiated oxidation in the presence of NO(x). The yields of these products do not vary significantly with O(2) partial pressure or oxidising agent (OH or Cl). However, the yield of formic acid decreased by at least a factor of two in the absence of NO(x). The results of these experiments are used to elucidate a simplified gas-phase atmospheric degradation scheme for 1,3-dioxane and also provide valuable information on the atmospheric fate of the cyclic and linear alkoxy radicals produced in these and similar reactions. The available experimental data suggests that the relative importance of the competing pathways (reaction with O(2) and ring opening by C-C or C-O bond fission) is a strong function of the ring strain in the cycloalkoxy radicals.
Collapse
Affiliation(s)
- Jennie Moriarty
- Department of Chemistry and Environmental Research Institute, University College Cork, Cork, Ireland
| | | | | |
Collapse
|
17
|
Jiménez E, Antiñolo M, Ballesteros B, Martínez E, Albaladejo J. Atmospheric Lifetimes and Global Warming Potentials of CF
3
CH
2
CH
2
OH and CF
3
(CH
2
)
2
CH
2
OH. Chemphyschem 2010; 11:4079-87. [DOI: 10.1002/cphc.201000365] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Elena Jiménez
- Departamento de Química Física, Facultad de Ciencias Químicas, Universidad de Castilla‐La Mancha, Avda. Camilo José Cela, s/n. 13071 Ciudad Real (Spain), Fax: (+34) 926‐29‐53‐18
| | - María Antiñolo
- Departamento de Química Física, Facultad de Ciencias Químicas, Universidad de Castilla‐La Mancha, Avda. Camilo José Cela, s/n. 13071 Ciudad Real (Spain), Fax: (+34) 926‐29‐53‐18
| | - Bernabé Ballesteros
- Departamento de Química Física, Facultad de Ciencias Químicas, Universidad de Castilla‐La Mancha, Avda. Camilo José Cela, s/n. 13071 Ciudad Real (Spain), Fax: (+34) 926‐29‐53‐18
| | - Ernesto Martínez
- Departamento de Química Física, Facultad de Ciencias Químicas, Universidad de Castilla‐La Mancha, Avda. Camilo José Cela, s/n. 13071 Ciudad Real (Spain), Fax: (+34) 926‐29‐53‐18
| | - José Albaladejo
- Departamento de Química Física, Facultad de Ciencias Químicas, Universidad de Castilla‐La Mancha, Avda. Camilo José Cela, s/n. 13071 Ciudad Real (Spain), Fax: (+34) 926‐29‐53‐18
| |
Collapse
|
18
|
Giri BR, Roscoe JM. Kinetics of the Reactions of Cl Atoms with Several Ethers. J Phys Chem A 2010; 114:8369-75. [DOI: 10.1021/jp1037409] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Binod R. Giri
- Department of Chemistry, Acadia University, Wolfville, Nova Scotia, B4P 2R6, Canada
| | - John M. Roscoe
- Department of Chemistry, Acadia University, Wolfville, Nova Scotia, B4P 2R6, Canada
| |
Collapse
|