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Assaf E, Finewax Z, Marshall P, Veres PR, Neuman JA, Burkholder JB. Measurement of the Intramolecular Hydrogen-Shift Rate Coefficient for the CH 3SCH 2OO Radical between 314 and 433 K. J Phys Chem A 2023; 127:2336-2350. [PMID: 36862996 DOI: 10.1021/acs.jpca.2c09095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
The intramolecular hydrogen-shift rate coefficient of the CH3SCH2O2 (methylthiomethylperoxy, MSP) radical, a product formed in the oxidation of dimethyl sulfide (DMS), was measured using a pulsed laser photolysis flow tube reactor coupled to a high-resolution time-of-flight chemical ionization mass spectrometer that measured the formation of the DMS degradation end product HOOCH2SCHO (hydroperoxymethyl thioformate). Measurements performed over the temperature range of 314-433 K yielded a hydrogen-shift rate coefficient of k1(T) = (2.39 ± 0.7) × 109 exp(-(7278 ± 99)/T) s-1 Arrhenius expression and a value extrapolated to 298 K of 0.06 s-1. The potential energy surface and the rate coefficient have also been theoretically investigated using density functional theory at the M06-2X/aug-cc-pVTZ level combined with approximate CCSD(T)/CBS energies yielding k1(273-433 K) = 2.4 × 1011 × exp(-8782/T) s-1 and k1(298 K) = 0.037 s-1 in fair agreement with the experimental results. Present results are compared with the previously reported values of k1(293-298 K).
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Affiliation(s)
- Emmanuel Assaf
- Chemical Sciences Laboratory, National Oceanic and Atmospheric Administration (NOAA), Boulder, Colorado 80305-3327, United States.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80309, United States
| | - Zachary Finewax
- Chemical Sciences Laboratory, National Oceanic and Atmospheric Administration (NOAA), Boulder, Colorado 80305-3327, United States.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80309, United States
| | - Paul Marshall
- Chemical Sciences Laboratory, National Oceanic and Atmospheric Administration (NOAA), Boulder, Colorado 80305-3327, United States.,Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80309, United States
| | - Patrick R Veres
- Chemical Sciences Laboratory, National Oceanic and Atmospheric Administration (NOAA), Boulder, Colorado 80305-3327, United States
| | - J Andrew Neuman
- Chemical Sciences Laboratory, National Oceanic and Atmospheric Administration (NOAA), Boulder, Colorado 80305-3327, United States
| | - James B Burkholder
- Chemical Sciences Laboratory, National Oceanic and Atmospheric Administration (NOAA), Boulder, Colorado 80305-3327, United States
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Rhyman L, Lee EPF, Ramasami P, Dyke JM. A study of the thermodynamics and mechanisms of the atmospherically relevant reaction dimethyl sulphide (DMS) with atomic chlorine (Cl) in the absence and presence of water, using electronic structure methods. Phys Chem Chem Phys 2023; 25:4780-4793. [PMID: 36692209 DOI: 10.1039/d2cp05814f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The thermodynamics and mechanisms of the atmospherically relevant reaction dimethyl sulphide (DMS) + atomic chlorine (Cl) were investigated in the absence and presence of a single water molecule, using electronic structure methods. Stationary points on each reaction surface were located using density functional theory (DFT) with the M06-2X functional with aug-cc-pVDZ (aVDZ) and aug-cc-pVTZ (aVTZ) basis sets. Then fixed point calculations were carried out using the UM06-2X/aVTZ optimised stationary point geometries, with aug-cc-pVnZ basis sets (n = T and Q), using the coupled cluster method [CCSD(T)], as well as the domain-based local pair natural orbitals coupled cluster [DLPNO-UCCSD(T)] approach. Four reaction channels are possible, formation of (A) CH3SCH2 + HCl, (B) CH3S + CH3Cl, (C) CH3SCl + CH3, and (C') CH3S(Cl)CH3. The results show that, in the absence of water, channels A and C' are the dominant channels. In the presence of water, the calculations show that the reaction mechanisms for A and C formation change significantly. Channel A occurs via submerged TSs and is expected to be rapid. Channel B occurs via TSs which present significant energy barriers indicating that this channel is not significant in the presence of water relative to CH3SCH2 + HCl and DMS·Cl adduct formation, as is the case in the absence of water. Channel C was not considered as it is endothermic in the absence of water. In the presence of water, pathways which proceed via (a) DMS·H2O + Cl, (b) Cl·H2O + DMS and (c) DMS·Cl + H2O were considered. It was found that under tropospheric conditions, reactions via pathway (b) are of minor importance relative to those that proceed via pathways (a) and (c). This study has shown that water changes the mechanisms of the DMS + Cl reactions significantly but the presence of water is not expected to affect the overall reaction rate coefficient under atmospheric conditions as the DMS + Cl reaction has a rate coefficient at room temperature close to the collisional limit.
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Affiliation(s)
- Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 80837, Mauritius. .,Centre For Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg, 2028, South Africa
| | - Edmond P F Lee
- School of Chemistry, University of Southampton, Highfield, Southampton, SO17 1BJ, UK.
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, 80837, Mauritius. .,Centre For Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg, 2028, South Africa
| | - John M Dyke
- School of Chemistry, University of Southampton, Highfield, Southampton, SO17 1BJ, UK.
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Cardona AL, Gibilisco RG, Blanco MB, Wiesen P, Teruel M. Gas-phase degradation of 2-butanethiol initiated by OH radicals and Cl atoms: kinetics, product yields and mechanism at 298 K and atmospheric pressure. RSC Adv 2019; 9:22618-22626. [PMID: 35519461 PMCID: PMC9067059 DOI: 10.1039/c9ra04051j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 07/14/2019] [Indexed: 11/21/2022] Open
Abstract
Relative rate coefficients and product distribution of the reaction of 2-butanethiol (2butSH) with OH radicals and Cl atoms were obtained at atmospheric pressure and 298 K. The experiments were performed in a 480 L borosilicate glass photoreactor in synthetic air coupled to a long path "in situ" FTIR spectrometer. The rate coefficients obtained by averaging the values from different experiments were: k OH = (2.58 ± 0.21) × 10-11 cm3 per molecule per s and k Cl = (2.49 ± 0.19) × 10-10 cm3 per molecule per s. The kinetic values were compared with related alkyl thiols and homologous alkyl alcohols, where it was found that thiols react faster with both oxidants, OH radicals and Cl atoms. SO2 and 2-butanone were the major products identified for the reactions of 2-butanethiol with OH radicals and Cl atoms. The product yield of the reaction of 2-butanethiol and OH radicals were (81 ± 2)%, and (42 ± 1)% for SO2 and 2-butanone, respectively. For the reactions of 2-butanethiol with Cl atom, yields of SO2 and 2-butanone were (59 ± 2)% and (39 ± 2)%, respectively. A degradation mechanism was proposed for the pathways that leads to formation of identified products. The product distribution observed indicated that the H-atom of the S-H group abstraction channel is the main pathway for the reaction of OH radicals and Cl atoms with 2-butanethiol.
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Affiliation(s)
- Alejandro L Cardona
- LUQCA-Instituto de Investigaciones en Fisicoquímica de Córdoba, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba Ciudad Universitaria 5000 Córdoba Argentina
| | - Rodrigo G Gibilisco
- Institute for Atmospheric and Environmental Research, Bergische Universität Wuppertal 42097 Wuppertal Germany
| | - María B Blanco
- LUQCA-Instituto de Investigaciones en Fisicoquímica de Córdoba, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba Ciudad Universitaria 5000 Córdoba Argentina
| | - Peter Wiesen
- Institute for Atmospheric and Environmental Research, Bergische Universität Wuppertal 42097 Wuppertal Germany
| | - Mariano Teruel
- LUQCA-Instituto de Investigaciones en Fisicoquímica de Córdoba, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba Ciudad Universitaria 5000 Córdoba Argentina
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Cardona AL, Blanco MB, Ventura ON, Teruel MA. Tropospheric degradation of propanethiol initiated by Cl radicals: Kinetics, mechanism and computational studies. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.03.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Sutradhar D, Bhattarai S, Zeegers-Huyskens T, Chandra AK. Unusual Fluorine Substitution Effect on S···Cl Bonding between Sulfides and Atomic Chlorine. J Phys Chem A 2018; 122:7142-7150. [PMID: 30122037 DOI: 10.1021/acs.jpca.8b04495] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A theoretical investigation on the interaction of various sulfides and their fluorinated counterparts (H2S, HSF, F2S, CH3SH, CH3SF, CH2FSH, CH2FSF, NH2SH, NH2SF) with atomic chlorine has been carried out using density functional theory (DFT) based LC-BLYP/aug-cc-pVTZ and sophisticated ab initio CCSD(T)/aug-cc-pVQZ methods. The present study is intended to discuss the influence of the substituents implanted at the sulfur atom on the bonding parameters. The optimized geometries reveal that intermolecular S···Cl distances are short and range between 2.423 and 2.561 Å. A strong contraction of the S-F bond is also predicted. Two-center-three-electron S···Cl bonds are formed; the interaction energies are large and range from -33.9 to -70.1 kJ mol-1. Very surprisingly, the interaction energies are greater and the intermolecular distances are shorter for F-substituted sulfides than for unsubstituted ones. This is in complete contrast with the lower proton affinities and less negative electrostatic potentials of fluorinated sulfides. AIM analysis, the charge transfer from the sulfur atom to the Cl atom, and the spin densities on the Cl and S atoms are considered to explain this unusual behavior. The hyperconjugation energies from the LP(F) to the σ*(S-Cl) antibonding orbital can be considered as one of the stabilizing factors for the greater stability of the fluorinated complexes over the nonfluorinated ones.
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Affiliation(s)
- Dipankar Sutradhar
- Department of Chemistry, Centre for Advanced Studies , North-Eastern Hill University , 793022 Shillong , India
| | - Sumitra Bhattarai
- Department of Chemistry, Centre for Advanced Studies , North-Eastern Hill University , 793022 Shillong , India
| | | | - Asit K Chandra
- Department of Chemistry, Centre for Advanced Studies , North-Eastern Hill University , 793022 Shillong , India
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Oksdath-Mansilla G, Peñéñory AB, Albu M, Barnes I, Wiesen P, Teruel MA. CH3CH2SCH3 + OH radicals: temperature-dependent rate coefficient and product identification under atmospheric pressure of air. J PHYS ORG CHEM 2010. [DOI: 10.1002/poc.1714] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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FTIR relative kinetic study of the reactions of CH3CH2SCH2CH3 and CH3CH2SCH3 with OH radicals and Cl atoms at atmospheric pressure. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.06.035] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Wang HT, Hu CJ, Mu YJ, Zhang YJ. Rate Constants for Reaction Between Hydroxyl Radical and Dimethyl Sulfide Under Real Atmospheric Condition. CHINESE J CHEM PHYS 2008. [DOI: 10.1088/1674-0068/21/05/407-414] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Stark H, Brown SS, Goldan PD, Aldener M, Kuster WC, Jakoubek R, Fehsenfeld FC, Meagher J, Bates TS, Ravishankara AR. Influence of nitrate radical on the oxidation of dimethyl sulfide in a polluted marine environment. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007669] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- H. Stark
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - S. S. Brown
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - P. D. Goldan
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - M. Aldener
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - W. C. Kuster
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - R. Jakoubek
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - F. C. Fehsenfeld
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - J. Meagher
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - T. S. Bates
- Pacific Marine Environmental Laboratory; NOAA; Seattle Washington USA
| | - A. R. Ravishankara
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
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Barnes I, Hjorth J, Mihalopoulos N. Dimethyl Sulfide and Dimethyl Sulfoxide and Their Oxidation in the Atmosphere. Chem Rev 2006; 106:940-75. [PMID: 16522014 DOI: 10.1021/cr020529+] [Citation(s) in RCA: 207] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ian Barnes
- Bergische Universität Wuppertal, FB C-Physikalische Chemie, Gauss Strasse 20, 42119 Wuppertal, Germany
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