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Pérez-González A, Castañeda-Arriaga R, Guzmán-López EG, Hernández-Ayala LF, Galano A. Chalcone Derivatives with a High Potential as Multifunctional Antioxidant Neuroprotectors. ACS OMEGA 2022; 7:38254-38268. [PMID: 36340167 PMCID: PMC9631883 DOI: 10.1021/acsomega.2c05518] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 09/30/2022] [Indexed: 05/28/2023]
Abstract
A systematic, rational search for chalcone derivatives with multifunctional behavior has been carried out, with the support of a computer-assisted protocol (CADMA-Chem). A total of 568 derivatives were constructed by incorporating functional groups into the chalcone structure. Selection scores were calculated from ADME properties, toxicity, and manufacturability descriptors. They were used to select a subset of molecules (23) with the best drug-like behavior. Reactivity indices were calculated for this subset. They were chosen to account for electron and hydrogen atom donating capabilities, which are key processes for antioxidant activity. The indexes showed that four chalcone derivatives (dCHA-279, dCHA-568, dCHA-553, and dCHA-283) are better electron and H donors than the parent molecule and some reference antioxidants (Trolox, ascorbic acid, and α-tocopherol). In addition, based on molecular docking, they are predicted to act as catechol-O-methyltransferase (COMT), acetylcholinesterase (AChE), and monoamine oxidase B (MAO-B) inhibitors. Therefore, these four molecules are proposed as promising candidates to act as multifunctional antioxidants with neuroprotective effects.
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Affiliation(s)
- Adriana Pérez-González
- CONACYT
- Universidad Autónoma Metropolitana - Iztapalapa Avenida Ferrocarril
San Rafael Atlixco, número 186, Colonia Leyes de Reforma 1A Sección, Alcaldía Iztapalapa, Código Postal 09310, Ciudad de México, México
| | - Romina Castañeda-Arriaga
- Departamento
de Química. Universidad Autónoma
Metropolitana-Iztapalapa, Avenida Ferrocarril San Rafael Atlixco, número 186, Colonia Leyes
de Reforma 1A Sección, Alcaldía
Iztapalapa, Código Postal 09310, Ciudad de México, México
| | - Eduardo Gabriel Guzmán-López
- Departamento
de Química. Universidad Autónoma
Metropolitana-Iztapalapa, Avenida Ferrocarril San Rafael Atlixco, número 186, Colonia Leyes
de Reforma 1A Sección, Alcaldía
Iztapalapa, Código Postal 09310, Ciudad de México, México
| | - Luis Felipe Hernández-Ayala
- Departamento
de Química. Universidad Autónoma
Metropolitana-Iztapalapa, Avenida Ferrocarril San Rafael Atlixco, número 186, Colonia Leyes
de Reforma 1A Sección, Alcaldía
Iztapalapa, Código Postal 09310, Ciudad de México, México
| | - Annia Galano
- Departamento
de Química. Universidad Autónoma
Metropolitana-Iztapalapa, Avenida Ferrocarril San Rafael Atlixco, número 186, Colonia Leyes
de Reforma 1A Sección, Alcaldía
Iztapalapa, Código Postal 09310, Ciudad de México, México
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Kumar A, Mondal K, Rajakumar B. A Combined Experimental and Theoretical Study to Determine the Kinetics of 2-Ethoxy Ethanol with OH Radical in the Gas Phase. J Phys Chem A 2021; 125:8869-8881. [PMID: 34587445 DOI: 10.1021/acs.jpca.1c06590] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reactivity of 2-ethoxy ethanol with OH radicals was experimentally measured in the temperature range of 278-363 K using the pulsed laser photolysis-laser-induced fluorescence (PLP-LIF) technique. The rate coefficient at room temperature was measured to be (1.14 ± 0.03) × 10-11 cm3 molecule-1 s-1, and the Arrhenius expression was derived to be kexpt278-363K = (1.61 ± 0.35) × 10-13 exp{(1256 ± 236)/T} cm3 molecule-1 s-1. Computational calculations were performed to compute the kinetics of the titled reaction in the temperature range of 200-400 K using advanced methods incorporated with tunneling correction at the CCSD(T)/aug-cc-pVTZ//M06-2X/6-31+G(d,p) level of theory. The Arrhenius expression derived from the computationally calculated rate coefficients is ktheo200-400K = (1.59 ± 0.35) × 10-13exp{(1389 ± 62)/T} cm3 molecule-1 s-1. The feasibility of each reaction pathway was also determined using the calculated thermochemical parameters. Atmospheric implication parameters such as cumulative atmospheric lifetime and photochemical ozone creation potential were calculated and are discussed in this paper.
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Affiliation(s)
- Avinash Kumar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai600036, India
| | - Koushik Mondal
- Department of Chemistry, Indian Institute of Technology Madras, Chennai600036, India
| | - B Rajakumar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai600036, India.,Center for Atmospheric and Climate Sciences, Indian Institute of Technology Madras, Chennai600036, India
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Xiao F, Sun X, Li Z, Li X. Theoretical Study of Radical-Molecule Reactions with Negative Activation Energies in Combustion: Hydroxyl Radical Addition to Alkenes. ACS OMEGA 2020; 5:12777-12788. [PMID: 32548462 PMCID: PMC7288374 DOI: 10.1021/acsomega.0c00400] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 05/15/2020] [Indexed: 06/11/2023]
Abstract
Many of the radical-molecule reactions are nonelementary reactions with negative activation energies, which usually proceed through two steps. They exist extensively in the atmospheric chemistry and hydrocarbon fuel combustion, so they are extensively studied both theoretically and experimentally. At the same time, various models, such as a two transition state model, a steady-state model, an equilibrium-state model, and a direct elementary dynamics model are proposed to get the kinetic parameters for the overall reaction. In this paper, a conversion temperature T C1 is defined as the temperature at which the standard molar Gibbs free energy change of the formation of the reaction complex is equal to zero, and it is found that when T ≫ T C1, the direct elementary dynamics model with an inclusion of the tunneling correction of the second step reaction is applicable to calculate the overall reaction rate constants for this kind of reaction system. The reaction class of hydroxyl radical addition to alkenes is chosen as the objects of this study, five reactions are chosen as the representative for the reaction class, and their single-point energies are calculated using the method of CCSD(T)/CBS, and it is shown that the highest conversion temperature for the five reactions is 139.89 K, far below the usual initial low-temperature (550 K) oxidation chemistry of hydrocarbon fuels; therefore, the steady-state approximation method is applicable. All geometry optimizations are performed at the BH&HLYP/6-311+G(d,p) level, and the result shows that the geometric parameters in the reaction centers are conserved; hence, the isodesmic reaction method is applicable to this reaction class. To validate the accuracy of this scheme, a comparison of electronic energy difference at the BH&HLYP/6-311+G(d,p) level and the corrected electronic energy difference with the electronic energy difference at the CCSD(T)/CBS level is performed for the five representative reactions, and it is shown that the maximum absolute deviation of electronic energy difference can be reduced from 2.54 kcal·mol-1 before correction to 0.58 kcal·mol-1 after correction, indicating that the isodesmic reaction method is applicable for the accurate calculation of the kinetic parameters for large-size molecular systems with a negative activation energy reaction. The overall rate constants for 44 reactions of the reaction class of hydroxyl radical addition to alkenes are calculated using the transition-state theory in combination with the isodesmic correction scheme, and high-pressure limit rate rules for the reaction class are developed. In addition, the thermodynamic parameter is calculated and the results indicate that our dynamics model is applicable for our studied reaction class. A chemical kinetic modeling and sensitivity analysis using the calculated kinetic data is performed for the combustion of ethene, and the results indicate the studied reaction is important for the low-to-medium temperature combustion modeling of ethene.
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Affiliation(s)
- FengXia Xiao
- College
of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - XiaoHui Sun
- College
of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
| | - ZeRong Li
- College
of Chemistry, Sichuan University, Chengdu 610064, P. R. China
| | - XiangYuan Li
- College
of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
- Engineering
Research Center of Combustion and Cooling for Aerospace Power, Ministry
of Education, Sichuan University, Chengdu, Sichuan 610065, P. R. China
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Computational Studies on the Thermodynamic and Kinetic Parameters of Oxidation of 2-Methoxyethanol Biofuel via H-Atom Abstraction by Methyl Radical. Sci Rep 2019; 9:15361. [PMID: 31653887 PMCID: PMC6814854 DOI: 10.1038/s41598-019-51544-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 09/28/2019] [Indexed: 11/08/2022] Open
Abstract
In this work, a theoretical investigation of thermochemistry and kinetics of the oxidation of bifunctional 2-Methoxyethanol (2ME) biofuel using methyl radical was introduced. Potential-energy surface for various channels for the oxidation of 2ME was studied at density function theory (M06-2X) and ab initio CBS-QB3 levels of theory. H-atom abstraction reactions, which are essential processes occurring in the initial stages of the combustion or oxidation of organic compounds, from different sites of 2ME were examined. A similar study was conducted for the isoelectronic n-butanol to highlight the consequences of replacing the ϒ CH2 group by an oxygen atom on the thermodynamic and kinetic parameters of the oxidation processes. Rate coefficients were calculated from the transition state theory. Our calculations show that energy barriers for n-butanol oxidation increase in the order of α ‹ O ‹ ϒ ‹ β ‹ ξ, which are consistent with previous data. However, for 2ME the energy barriers increase in the order α ‹ β ‹ ξ ‹ O. At elevated temperatures, a slightly high total abstraction rate is observed for the bifunctional 2ME (4 abstraction positions) over n-butanol (5 abstraction positions).
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Computational study on night-time reaction of 1, 1-Dichlorodimethylether (DCDME) CH3OCHCl2 with NO3 radical and the fortuity of alkoxy radical CH3OC(O )Cl2. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.04.045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Kovacevic G, Sabljic A. Atmospheric oxidation of halogenated aromatics: comparative analysis of reaction mechanisms and reaction kinetics. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2017; 19:357-369. [PMID: 28002503 DOI: 10.1039/c6em00577b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Atmospheric transport is the major route for global distribution of semi-volatile compounds such as halogenated aromatics as well as their major exposure route for humans. Their major atmospheric removal process is oxidation by hydroxyl radicals. There is very little information on the reaction mechanism or reaction-path dynamics of atmospheric degradation of halogenated benzenes. Furthermore, the measured reaction rate constants are missing for the range of environmentally relevant temperatures, i.e. 230-330 K. A series of recent theoretical studies have provided those valuable missing information for fluorobenzene, chlorobenzene, hexafluorobenzene and hexachlorobenzene. Their comparative analysis has provided additional and more general insight into the mechanism of those important tropospheric degradation processes as well as into the mobility, transport and atmospheric fate of halogenated aromatic systems. It was demonstrated for the first time that the addition of hydroxyl radicals to monohalogenated as well as to perhalogenated benzenes proceeds indirectly, via a prereaction complex and its formation and dynamics have been characterized including the respective transition-state. However, in fluorobenzene and chlorobenzene reactions hydroxyl radical hydrogen is pointing approximately to the center of the aromatic ring while in the case of hexafluorobenzene and hexachlorobenzene, unexpectedly, the oxygen is directed towards the center of the aromatic ring. The reliable rate constants are now available for all environmentally relevant temperatures for the tropospheric oxidation of fluorobenzene, chlorobenzene, hexafluorobenzene and hexachlorobenzene while pentachlorophenol, a well-known organic micropollutant, seems to be a major stable product of tropospheric oxidation of hexachlorobenzene. Their calculated tropospheric lifetimes show that fluorobenzene and chlorobenzene are easily removed from the atmosphere and do not have long-range transport potential while hexafluorobenzene seems to be a potential POP chemical and hexachlorobenzene is clearly a typical persistent organic pollutant.
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Affiliation(s)
- Goran Kovacevic
- Rudjer Boskovic Institute, Division of Physical Chemistry, POB 180, HR-10002 Zagreb, Republic of Croatia.
| | - Aleksandar Sabljic
- Rudjer Boskovic Institute, Division of Physical Chemistry, POB 180, HR-10002 Zagreb, Republic of Croatia.
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Xiao R, Zammit I, Wei Z, Hu WP, MacLeod M, Spinney R. Kinetics and Mechanism of the Oxidation of Cyclic Methylsiloxanes by Hydroxyl Radical in the Gas Phase: An Experimental and Theoretical Study. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:13322-13330. [PMID: 26477990 DOI: 10.1021/acs.est.5b03744] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The ubiquitous presence of cyclic volatile methylsiloxanes (cVMS) in the global atmosphere has recently raised environmental concern. In order to assess the persistence and long-range transport potential of cVMS, their second-order rate constants (k) for reactions with hydroxyl radical ((•)OH) in the gas phase are needed. We experimentally and theoretically investigated the kinetics and mechanism of (•)OH oxidation of a series of cVMS, hexamethylcyclotrisiloxane (D3), octamethycyclotetrasiloxane (D4), and decamethycyclopentasiloxane (D5). Experimentally, we measured k values for D3, D4, and D5 with (•)OH in a gas-phase reaction chamber. The Arrhenius activation energies for these reactions in the temperature range from 313 to 353 K were small (-2.92 to 0.79 kcal·mol(-1)), indicating a weak temperature dependence. We also calculated the thermodynamic and kinetic behaviors for reactions at the M06-2X/6-311++G**//M06-2X/6-31+G** level of theory over a wider temperature range of 238-358 K that encompasses temperatures in the troposphere. The calculated Arrhenius activation energies range from -2.71 to -1.64 kcal·mol(-1), also exhibiting weak temperature dependence. The measured k values were approximately an order of magnitude higher than the theoretical values but have the same trend with increasing size of the siloxane ring. The calculated energy barriers for H-atom abstraction at different positions were similar, which provides theoretical support for extrapolating k for other cyclic siloxanes from the number of abstractable hydrogens.
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Affiliation(s)
- Ruiyang Xiao
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University , Changsha, Hunan 410083, China
- Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution , Changsha, Hunan 410083, China
| | - Ian Zammit
- Department of Environmental Science and Analytical Chemistry, Stockholm University , Svante Arrhenius väg 8, Stockholm SE-11418, Sweden
| | | | - Wei-Ping Hu
- Department of Chemistry and Biochemistry, National Chung Cheng University , Minxiong, Chia-Yi 62102, Taiwan
| | - Matthew MacLeod
- Department of Environmental Science and Analytical Chemistry, Stockholm University , Svante Arrhenius väg 8, Stockholm SE-11418, Sweden
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Gai Y, Lin X, Ma Q, Hu C, Gu X, Zhao W, Fang B, Zhang W, Long B, Long Z. Experimental and Theoretical Study of Reactions of OH Radicals with Hexenols: An Evaluation of the Relative Importance of the H-Abstraction Reaction Channel. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:10380-10388. [PMID: 26274814 DOI: 10.1021/acs.est.5b01682] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
C6 hexenols are one of the most significant groups of volatile organic compounds with biogenic emissions. The lack of corresponding kinetic parameters and product information on their oxidation reactions will result in incomplete atmospheric chemical mechanisms and models. In this paper, experimental and theoretical studies are reported for the reactions of OH radicals with a series of C6 hexenols, (Z)-2-hexen-1-ol, (Z)-3-hexen-1-ol, (Z)-4-hexen-1-ol, (E)-2-hexen-1-ol, (E)-3-hexen-1-ol, and (E)-4-hexen-1-ol, at 298 K and 1.01 × 10(5) Pa. The corresponding rate constants were 8.53 ± 1.36, 10.1 ± 1.6, 7.86 ± 1.30, 8.08 ± 1.33, 9.10 ± 1.50, and 7.14 ± 1.20 (in units of 10(-11) cm(3) molecule(-1) s(-1)), respectively, measured by gas chromatography with a flame ionization detector (GC-FID), using a relative technique. Theoretical calculations concerning the OH-addition and H-abstraction reaction channels were also performed for these reactions to further understand the reaction mechanism and the relative importance of the H-abstraction reaction. By contrast to previously reported results, the H-abstraction channel is a non-negligible reaction channel for reactions of OH radicals with these hexenols. The rate constants of the H-abstraction channel are comparable with those for the OH-addition channel and contribute >20% for most of the studied alcohols, even >50% for (E)-3-hexen-1-ol. Thus, H-abstraction channels may have an important role in the reactions of these alcohols with OH radicals and must be considered in certain atmospheric chemical mechanisms and models.
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Affiliation(s)
| | | | | | | | | | | | | | - Weijun Zhang
- School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China , Hefei 230026, Anhui, China
| | | | - Zhengwen Long
- Department of Physics, Guizhou University , Guiyang 550025, China
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GOUR NANDKISHOR, GUPTA SATYENDRA, MISHRA BHUPESHKUMAR, SINGH HARIJI. A computational study on kinetics, mechanism and thermochemistry of gas-phase reactions of 3-hydroxy-2-butanone with OH radicals. J CHEM SCI 2015. [DOI: 10.1007/s12039-014-0733-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Younker JM, Saito T, Hunt MA, Naskar AK, Beste A. Pyrolysis Pathways of Sulfonated Polyethylene, an Alternative Carbon Fiber Precursor. J Am Chem Soc 2013; 135:6130-41. [DOI: 10.1021/ja3121845] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jarod M. Younker
- Oak Ridge Associated Universities, 1 Bethel Valley Road, Oak Ridge, Tennessee
37831-6164, United States
| | - Tomonori Saito
- Materials Science and Technology
Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831-6053, United States
| | - Marcus A. Hunt
- Materials Science and Technology
Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831-6053, United States
| | - Amit K. Naskar
- Materials Science and Technology
Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831-6053, United States
| | - Ariana Beste
- Joint Institute for Computational
Sciences, University of Tennessee, 1 Bethel
Valley Road, Oak Ridge, Tennessee 37831-6164, United States
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Vereecken L, Francisco JS. Theoretical studies of atmospheric reaction mechanisms in the troposphere. Chem Soc Rev 2012; 41:6259-93. [DOI: 10.1039/c2cs35070j] [Citation(s) in RCA: 311] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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12
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Yang X, Kiefer JH, Tranter RS. Thermal dissociation of ethylene glycol vinyl ether. Phys Chem Chem Phys 2011; 13:21288-300. [PMID: 22024976 DOI: 10.1039/c1cp21073d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The pyrolysis of ethylene glycol vinyl ether (EGVE), an initial product of 1,4-dioxane dissociation, was examined in a diaphragmless shock tube (DFST) using laser schlieren densitometry (LS) at 57 ± 2 and 122 ± 3 Torr over 1200-1800 K. DFST/time-of-flight mass spectrometry experiments were also performed to identify reaction products. EGVE was found to dissociate via two channels: (1) a molecular H atom transfer/C-O scission to produce C(2)H(3)OH and CH(3)CHO, and (2) a radical channel involving C-O bond fission generating ˙CH(2)CH(2)OH and ˙CH(2)CHO radicals, with the second channel being strongly dominant over the entire experimental range. A reaction mechanism was constructed for the pyrolysis of EGVE which simulates the LS profiles very well over the full experimental range. The decomposition of EGVE is clearly well into the falloff region for these conditions, and a Gorin model RRKM fit was obtained for the dominant radical channel. The results are in good agreement with the experimental data and suggest the following rate coefficient expressions: k(2,∞) = (6.71 ± 2.6) × 10(27) × T(-3.21)exp(-35512/T) s(-1); k(2)(120 Torr) = (1.23 ± 0.5) × 10(92) × T(-22.87)exp(-48 248/T) s(-1); k(2)(60 Torr) = (2.59 ± 1.0) × 10(88) × T(-21.96)exp(-46283/T) s(-1).
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Affiliation(s)
- Xueliang Yang
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL-60439, USA
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Wang L, Tang A. Oxidation mechanisms of dimethyl selenide and selenoxide in the atmosphere initiated by OH radical. A theoretical study. Chem Phys 2011. [DOI: 10.1016/j.chemphys.2011.03.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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14
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Scheiner S, Kar T. Analysis of the Reactivities of Protein C−H Bonds to H Atom Abstraction by OH Radical. J Am Chem Soc 2010; 132:16450-9. [DOI: 10.1021/ja105204v] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Steve Scheiner
- Department of Chemistry & Biochemistry, Utah State University, Logan, Utah 84322, United States
| | - Tapas Kar
- Department of Chemistry & Biochemistry, Utah State University, Logan, Utah 84322, United States
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