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Theoretical investigation for the reactions of hydrogen atom with dimethyl sulfide, ethyl methyl sulfide: Mechanism and kinetics properties. COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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2
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Shi G, Song J. Quantum chemical and theoretical kinetics studies on the reactions of hydroperoxy radical with methanethiol and ethanethiol. COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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3
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Shi G, Song J. Theoretical study on the kinetics of the reactions of hydrogen atom, methyl radical with methanethiol and ethanethiol. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2106319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Gai Shi
- State Key Laboratory of Engines, Tianjin University, Tianjin, People’s Republic of China
| | - Jinou Song
- State Key Laboratory of Engines, Tianjin University, Tianjin, People’s Republic of China
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Shi G, Song J. Theoretical investigation on the mechanisms and kinetics of the reactions of hydroperoxy radical with dimethyl sulphide and ethyl methyl sulphide. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2101561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Gai Shi
- State Key Laboratory of Engines, Tianjin University, Tianjin, People’s Republic of China
| | - Jinou Song
- State Key Laboratory of Engines, Tianjin University, Tianjin, People’s Republic of China
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Shi G, Song J. Theoretical investigation for the reactions of triplet oxygen atom with dimethyl sulphide, ethyl methyl sulphide: mechanism and kinetics properties. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2098196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Gai Shi
- State Key Laboratory of Engines, Tianjin University, Tianjin, People’s Republic of China
| | - Jinou Song
- State Key Laboratory of Engines, Tianjin University, Tianjin, People’s Republic of China
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Butkovskaya NI, Setser DW. Reactions of OH and OD radicals with ethanethiol and diethylsulfide: Branching ratio and vibrational energy disposal for the product water molecules. Chem Phys 2022. [DOI: 10.1016/j.chemphys.2021.111404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Vasiliou AK, Anderson DE, Cowell TW, Kong J, Melhado WF, Phillips MD, Whitman JC. Thermal Decomposition Mechanism for Ethanethiol. J Phys Chem A 2017; 121:4953-4960. [PMID: 28558212 DOI: 10.1021/acs.jpca.7b02629] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The thermal decomposition of ethanethiol was studied using a 1 mm × 2 cm pulsed silicon carbide microtubular reactor, CH3CH2SH + Δ → Products. Unlike previous studies these experiments were able to identify the initial ethanethiol decomposition products. Ethanethiol was entrained in either an Ar or a He carrier gas, passed through a heated (300-1700 K) SiC microtubular reactor (roughly ≤100 μs residence time) and exited into a vacuum chamber. Within one reactor diameter the gas cools to less than 50 K rotationally, and all reactions cease. The resultant molecular beam was probed by photoionization mass spectroscopy and IR spectroscopy. Ethanethiol was found to undergo unimolecular decomposition by three pathways: CH3CH2SH → (1) CH3CH2 + SH, (2) CH3 + H2C═S, and (3) H2C═CH2 + H2S. The experimental findings are in good agreement with electronic structure calculations.
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Affiliation(s)
- AnGayle K Vasiliou
- Department of Chemistry and Biochemistry, Middlebury College , Middlebury, Vermont 05753, United States
| | - Daniel E Anderson
- Department of Chemistry and Biochemistry, Middlebury College , Middlebury, Vermont 05753, United States
| | - Thomas W Cowell
- Department of Chemistry and Biochemistry, Middlebury College , Middlebury, Vermont 05753, United States
| | - Jessica Kong
- Department of Chemistry and Biochemistry, Middlebury College , Middlebury, Vermont 05753, United States
| | - William F Melhado
- Department of Chemistry and Biochemistry, Middlebury College , Middlebury, Vermont 05753, United States
| | - Margaret D Phillips
- Department of Chemistry and Biochemistry, Middlebury College , Middlebury, Vermont 05753, United States
| | - Jared C Whitman
- Department of Chemistry and Biochemistry, Middlebury College , Middlebury, Vermont 05753, United States
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Cardoso DVV, Cunha LA, Spada RFK, Petty CA, Ferrão LFA, Roberto-Neto O, Machado FBC. Thermochemical and Kinetics of CH 3SH + H Reactions: The Sensitivity of Coupling the Low and High-Level Methodologies. J Phys Chem A 2017; 121:419-428. [PMID: 28005366 DOI: 10.1021/acs.jpca.6b09272] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction system formed by the methanethiol molecule (CH3SH) and a hydrogen atom was studied via three elementary reactions, two hydrogen abstractions and the C-S bond cleavage (CH3SH + H → CH3S + H2 (R1); → CH2SH + H2 (R2); → CH3 + H2S (R3)). The stable structures were optimized with various methodologies of the density functional theory and the MP2 method. Two minimum energy paths for each elementary reaction were built using the BB1K and MP2 methodologies, and the electronic properties on the reactants, products, and saddle points were improved with coupled cluster theory with single, double, and connected triple excitations (CCSD(T)) calculations. The sensitivity of coupling the low and high-level methods to calculate the thermochemical and rate constants were analyzed. The thermal rate constants were obtained by means of the improved canonical variational theory (ICVT) and the tunneling corrections were included with the small curvature tunneling (SCT) approach. Our results are in agreement with the previous experimental measurements and the calculated branching ratio for R1:R2:R3 is equal to 0.96:0:0.04, with kR1 = 9.64 × 10-13 cm3 molecule-1 s-1 at 298 K.
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Affiliation(s)
- Daniely V V Cardoso
- Departamento de Química, Instituto Tecnológico de Aeronáutica , São José dos Campos, 12.228-900, São Paulo, Brazil
| | - Leonardo A Cunha
- Departamento de Química, Instituto Tecnológico de Aeronáutica , São José dos Campos, 12.228-900, São Paulo, Brazil
| | - Rene F K Spada
- Departamento de Física, Universidade Federal do Espírito Santo , Vitória, 29.075-910, Espírito Santo, Brazil
| | - Corey A Petty
- Departamento de Química, Instituto Tecnológico de Aeronáutica , São José dos Campos, 12.228-900, São Paulo, Brazil
| | - Luiz F A Ferrão
- Departamento de Química, Instituto Tecnológico de Aeronáutica , São José dos Campos, 12.228-900, São Paulo, Brazil
| | - Orlando Roberto-Neto
- Divisão de Aerotermodinâmica e Hipersônica, Instituto de Estudos Avançados , São José dos Campos, 12.228-001, São Paulo, Brazil
| | - Francisco B C Machado
- Departamento de Química, Instituto Tecnológico de Aeronáutica , São José dos Campos, 12.228-900, São Paulo, Brazil
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Thermochemical and kinetics studies of the CH3SH+S (3P) hydrogen abstraction and insertion reactions. J Mol Model 2014; 20:2449. [PMID: 25204585 DOI: 10.1007/s00894-014-2449-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Accepted: 08/26/2014] [Indexed: 10/24/2022]
Abstract
Sulfur-containing molecules have a significant impact on atmosphere and biosphere. In this work we studied, from the point of view of electronic structure and chemical kinetics methods, the elementary reactions between a methanethiol molecule and a sulfur atom leading to hydrogen abstraction C-S bond cleavage (CH(3)SH+S; R1:→ CH(3)S+SH; R2: → CH(2)SH+SH; R3:→ CH(3)+HS(2)). The geometrical structures of the reactants, products, and saddle points for the three reaction paths were optimized using the BB1K method with the aug-cc-pV(T+d)Z basis set. The thermochemical properties were improved using single point coupled-cluster (CCSD(T)) calculations on the BB1K geometries followed by extrapolation to the complete basis set (CBS) limit. This methodology was previously applied and has given accurate values of thermochemical and kinetics properties when compared to benchmark calculations and experimental data. For each reaction, the thermal rate constants were calculated using the improved canonical variational theory (ICVT) including the zero-curvature (ICVT/ZCT) and small-curvature (ICVT/SCT) tunneling corrections. For comparison, the overall ICVT/SCT reaction rate constant at 300 K obtained with single-point CCSD(T)/CBS calculations for the CH(3)SH+S reaction is approximately 1400 times lower than the isovalent CH(3)SH+O reaction, obtained with CVT/SCT. The reaction path involving the hydrogen abstraction from the thiol group is the most important reactive path in all temperatures.
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Garver JM, Fang YR, Eyet N, Villano SM, Bierbaum VM, Westaway KC. A direct comparison of reactivity and mechanism in the gas phase and in solution. J Am Chem Soc 2010; 132:3808-14. [PMID: 20187638 DOI: 10.1021/ja909399u] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Direct comparisons of the reactivity and mechanistic pathways for anionic systems in the gas phase and in solution are presented. Rate constants and kinetic isotope effects for the reactions of methyl, ethyl, isopropyl, and tert-butyl iodide with cyanide ion in the gas phase, as well as for the reactions of methyl and ethyl iodide with cyanide ion in several solvents, are reported. In addition to measuring the perdeutero kinetic isotope effect (KIE) for each reaction, the secondary alpha- and beta-deuterium KIEs were determined for the ethyl iodide reaction. Comparisons of experimental results with computational transition states, KIEs, and branching fractions are explored to determine how solvent affects these reactions. The KIEs show that the transition state does not change significantly when the solvent is changed from dimethyl sulfoxide/methanol (a protic solvent) to dimethyl sulfoxide (a strongly polar aprotic solvent) to tetrahydrofuran (a slightly polar aprotic solvent) in the ethyl iodide-cyanide ion S(N)2 reaction in solution, as the "Solvation Rule for S(N)2 Reactions" predicts. However, the Solvation Rule fails the ultimate test of predicting gas phase results, where significantly smaller (more inverse) KIEs indicate the existence of a tighter transition state. This result is primarily attributed to the greater electrostatic forces between the partial negative charges on the iodide and cyanide ions and the partial positive charge on the alpha carbon in the gas phase transition state. Nevertheless, in evaluating the competition between S(N)2 and E2 processes, the mechanistic results for the solution and gas phase reactions are strikingly similar. The reaction of cyanide ion with ethyl iodide occurs exclusively by an S(N)2 mechanism in solution and primarily by an S(N)2 mechanism in the gas phase; only approximately 1% of the gas phase reaction is ascribed to an elimination process.
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Affiliation(s)
- John M Garver
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, USA
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Garzón A, Albaladejo J, Notario A, Peña-Ruiz T, Fernández-Gómez M. Kinetic and theoretical study of the reaction of Cl atoms with a series of linear thiols. J Chem Phys 2008; 129:194303. [DOI: 10.1063/1.3012355] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Beste A, Buchanan AC, Britt PF, Hathorn BC, Harrison RJ. Kinetic Analysis of the Pyrolysis of Phenethyl Phenyl Ether: Computational Prediction of α/β-Selectivities. J Phys Chem A 2007; 111:12118-26. [DOI: 10.1021/jp075861+] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Garzón A, Notario A, Albaladejo J, Peña-Ruiz T, Fernández-Gómez M. An experimental and theoretical study of the reaction of ethanethiol with Cl atoms. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.03.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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