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Rai PK, Kumar A, Kumar P. HO 2˙ as a potential reactant for the bimolecular reaction of tert-butoxy radicals in the atmosphere. Phys Chem Chem Phys 2024; 26:22395-22402. [PMID: 39140153 DOI: 10.1039/d4cp02800g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2024]
Abstract
Alkoxy radicals are key intermediates in the atmospheric degradation of volatile organic compounds. For most alkoxy radicals, reaction with O2 is the primary loss mechanism; however, only α-hydrogen-bearing alkoxy radicals undergo a reaction with O2. Interestingly, if one considers an alkoxy radical that does not possess an α-hydrogen, reaction with O2 is unlikely. In the present work, we propose HO2˙ as a potential reactant for such alkoxy radicals. We have considered the tert-butoxy radical (tBuO˙) as a prototype for those alkoxy radicals that do not possess an α-hydrogen. By means of high-level quantum chemical calculations, we have studied the energetics of the tBuO˙ + HO2˙ reaction along with isomerization and decomposition pathways. Finally, we have discussed the possible atmospheric implications of all three paths in the atmosphere using reaction rate calculations.
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Affiliation(s)
- Philips Kumar Rai
- Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, India.
| | - Amit Kumar
- Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, India.
| | - Pradeep Kumar
- Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, India.
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2
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Chen JT, Liang Y, Lang H, Lu X, Yang L, Zhou CW. Theoretical study on the H-atom abstraction reactions of pentanol + HȮ 2, part I: five branched pentanol isomers. Phys Chem Chem Phys 2024; 26:20022-20036. [PMID: 39007185 DOI: 10.1039/d4cp01923g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/16/2024]
Abstract
The chemical kinetic studies of hydrogen atom (H-atom) abstraction reactions by hydroperoxyl (HȮ2) radicals from five branched pentanol isomers, including 3-methyl-1-butanol, 2-methyl-1-butanol, 1,1-dimethyl-1-propanol, 1,2-dimethyl-1-propanol, and 2,2-dimethyl-1-propanol were investigated systematically through high-level ab initio calculations. Geometry optimization, frequency analysis, and zero-point energy (ZPE) corrections were performed for six reactants, twenty-three transition states (TSs), and twenty-four products at the M06-2X/6-311++G(d,p) level of theory. The intrinsic reaction coordinate calculation was performed at the same level of theory to confirm the transition state connection. The one-dimensional hindered rotor treatment for low-frequency torsional modes was also treated at the M06-2X/6-311++G(d,p) level of theory. The QCISD(T)/CBS level of theory was used to calculate the single-point energies for the species whose T1 diagnostic value was lower than 0.035. At the same time, the CASPT2/CBS level of theory was used to calculate the single-point energies for the channel in which the T1 diagnostic value of transition states was greater than 0.035. Rate constants for the H-atom abstraction reactions from the five branched pentanol isomers by HȮ2 radicals were calculated by using conventional transition state theory with asymmetric Eckart tunneling corrections in the temperature range of 500-2000 K. Rate constants and branching ratios for the title reactions and the rate rules for ten different H-atom abstraction types were investigated. Temperature-dependent thermochemistry properties for all reactants and products were calculated by the composite methods of G3/G4/CBS-QB3/CBS-APNO, which were in good agreement with the data available in the literature. Rate constants for the H-atom abstraction reactions by HȮ2 radical from branched pentanol isomers were investigated in this work as part I, and those for linear pentanol isomers will be analyzed in part II. All the calculated kinetics and thermochemistry data can be utilized in the model development for branched pentanol isomers oxidation.
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Affiliation(s)
- Jin-Tao Chen
- School of Energy and Power Engineering, Beihang University, Beijing 100191, P. R. China.
- Combustion Chemistry Centre, School of Biological and Chemical Sciences, MaREI, Ryan Institute, University of Galway, Galway, Ireland
| | - Yueying Liang
- Key Laboratory for Power Machinery and Engineering of M. O. E, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Haoyuan Lang
- School of Energy and Power Engineering, Beihang University, Beijing 100191, P. R. China.
| | - Xingcai Lu
- Key Laboratory for Power Machinery and Engineering of M. O. E, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Lijun Yang
- School of Astronautics, Beihang University, Beijing 100191, P. R. China
| | - Chong-Wen Zhou
- School of Energy and Power Engineering, Beihang University, Beijing 100191, P. R. China.
- Combustion Chemistry Centre, School of Biological and Chemical Sciences, MaREI, Ryan Institute, University of Galway, Galway, Ireland
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3
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Olive LN, Heide AD, Turney JM, Schaefer HF. Ethynyl Radical Hydrogen Abstraction Energetics and Kinetics Utilizing High-Level Theory. ACS EARTH & SPACE CHEMISTRY 2024; 8:1349-1358. [PMID: 39045226 PMCID: PMC11261607 DOI: 10.1021/acsearthspacechem.4c00040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 06/12/2024] [Accepted: 06/25/2024] [Indexed: 07/25/2024]
Abstract
The ethynyl radical, C2H, is found in a variety of different environments ranging from interstellar space and planetary atmospheres to playing an important role in the combustion of various alkynes under fuel-rich conditions. Hydrogen-atom abstraction reactions are common for the ethynyl radical in these contrasting environments. In this study, the C2H + HX → C2H2 + X, where HX = HNCO, trans-HONO, cis-HONO, C2H4, and CH3OH, reactions have been investigated at rigorously high levels of theory, including CCSD(T)-F12a/cc-pVTZ-F12. For the stationary points thus located, much higher levels of theory have been used, with basis sets as large as aug-cc-pV5Z and methods up to CCSDT(Q), and core correlation was also included. These molecules were chosen because they can be found in either interstellar or combustion environments. Various additive energy corrections have been included to converge the relative enthalpies of the stationary points to subchemical accuracy (≤0.5 kcal mol-1). Barriers predicted here (2.19 kcal mol-1 for the HNCO reaction and 0.47 kcal mol-1 for C2H4) are significantly lower than previous predictions. Reliable kinetics were acquired over a wide range of temperatures (50-5000 K), which may be useful for future experimental studies of these reactions.
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Affiliation(s)
- Laura N Olive
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Alexandra D Heide
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Justin M Turney
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Henry F Schaefer
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
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4
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Doner AC, Dewey NS, Rotavera B. Unimolecular Reactions of 2-Methyloxetanyl and 2-Methyloxetanylperoxy Radicals. J Phys Chem A 2023; 127:6816-6829. [PMID: 37535464 PMCID: PMC10440797 DOI: 10.1021/acs.jpca.3c03918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 07/17/2023] [Indexed: 08/05/2023]
Abstract
Alkyl-substituted cyclic ethers are intermediates formed in abundance during the low-temperature oxidation of hydrocarbons and biofuels via a chain-propagating step with ȮH. Subsequent reactions of cyclic ether radicals involve a competition between ring opening and reaction with O2, the latter of which enables pathways mediated by hydroperoxy-substituted carbon-centered radicals (Q̇OOH). Due to the resultant implications of competing unimolecular and bimolecular reactions on overall populations of ȮH, detailed insight into the chemical kinetics of cyclic ethers remains critical to high-fidelity numerical modeling of combustion. Cl-initiated oxidation experiments were conducted on 2-methyloxetane (an intermediate of n-butane oxidation) using multiplexed photoionization mass spectrometry (MPIMS), in tandem with calculations of stationary point energies on potential energy surfaces for unimolecular reactions of 2-methyloxetanyl and 2-methyloxetanylperoxy isomers. The potential energy surfaces were computed using the KinBot algorithm with stationary points calculated at the CCSD(T)-F12/cc-pVDZ-F12 level of theory. The experiments were conducted at 6 Torr and two temperatures (650 K and 800 K) under pseudo-first-order conditions to facilitate Ṙ + O2 reactions. Photoionization spectra were measured from 8.5 eV to 11.0 eV in 50-meV steps, and relative yields were quantified for species consistent with Ṙ → products and Q̇OOH → products. Species detected in the MPIMS experiments are linked to specific radicals of 2-methyloxetane. Species from Ṙ → products include methyl, ethene, formaldehyde, propene, ketene, 1,3-butadiene, and acrolein. Ion signals consistent with products from alkyl radical oxidation were detected, including for Q̇OOH-mediated species, which are also low-lying channels on their respective potential energy surfaces. In addition to species common to alkyl oxidation pathways, ring-opening reactions of Q̇OOH radicals derived from 2-methyloxetane produced ketohydroperoxide species (performic acid and 2-hydroperoxyacetaldehyde), which may impart additional chain-branching potential, and dicarbonyl species (3-oxobutanal and 2-methylpropanedial), which often serve as proxies for modeling reaction rates of ketohydroperoxides. The experimental and computational results underscore that reactions of cyclic ethers are inherently more complex than currently prescribed in chemical kinetic models utilized for combustion.
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Affiliation(s)
- Anna C. Doner
- University
of Georgia, Department of Chemistry, Athens, Georgia 30602, United States
| | - Nicholas S. Dewey
- University
of Georgia, Department of Chemistry, Athens, Georgia 30602, United States
| | - Brandon Rotavera
- University
of Georgia, Department of Chemistry, Athens, Georgia 30602, United States
- University
of Georgia, College of Engineering, Athens, Georgia 30602, United States
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5
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Viegas LP. A Multiconformational Transition State Theory Approach to OH Tropospheric Degradation of Fluorotelomer Aldehydes. Chemphyschem 2023; 24:e202300259. [PMID: 37326576 DOI: 10.1002/cphc.202300259] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 06/09/2023] [Accepted: 06/12/2023] [Indexed: 06/17/2023]
Abstract
Experimental work on the OH-initiated oxidation reactions of fluorotelomer aldehydes (FTALs) strongly suggests that the respective rate coefficients do not depend on the size of the Cx F2x+1 fluoroalkyl chain. FTALs hence represent a challenging test to our multiconformer transition state theory (MC-TST) protocol based on constrained transition state randomization (CTSR), since the calculated rate coefficients should not show significant variations with increasing values of x ${x}$ . In this work we apply the MC-TST/CTSR protocol to thex = 2 , 3 ${x={\rm 2,3}}$ cases and calculate both rate coefficients at 298.15 K with a value ofk = ( 2 . 4 ± 1 . 4 ) × 10 - 12 ${k=(2.4\pm 1.4)\times {10}^{-12}}$ cm3 molecule-1 s-1 , practically coincident with the recommended experimental value of kexp =( 2 . 8 ± 1 . 4 ) × 10 - 12 ${(2.8\pm 1.4)\times {10}^{-12}}$ cm3 molecule-1 s-1 . We also show that the use of tunneling corrections based on improved semiclassical TST is critical in obtaining Arrhenius-Kooij curves with a correct behavior at lower temperatures.
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Affiliation(s)
- Luís P Viegas
- Coimbra Chemistry Centre-Institute of Molecular Sciences (CQC-IMS), Department of Chemistry, University of Coimbra, 3004-535, Coimbra, Portugal
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Dana AG, Johnson MS, Allen JW, Sharma S, Raman S, Liu M, Gao CW, Grambow CA, Goldman MJ, Ranasinghe DS, Gillis RJ, Payne AM, Li Y, Dong X, Spiekermann KA, Wu H, Dames EE, Buras ZJ, Vandewiele NM, Yee NW, Merchant SS, Buesser B, Class CA, Goldsmith F, West RH, Green WH. Automated reaction kinetics and network exploration (Arkane): A statistical mechanics, thermodynamics, transition state theory, and master equation software. INT J CHEM KINET 2023. [DOI: 10.1002/kin.21637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Affiliation(s)
- Alon Grinberg Dana
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
- The Wolfson Department of Chemical Engineering and Grand Technion Energy Program (GTEP) Technion – Israel Institute of Technology Haifa Israel
| | - Matthew S. Johnson
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Joshua W. Allen
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Sandeep Sharma
- Department of Chemistry University of Colorado Boulder CO USA
| | - Sumathy Raman
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Mengjie Liu
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Connie W. Gao
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Colin A. Grambow
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Mark J. Goldman
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Duminda S. Ranasinghe
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Ryan J. Gillis
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - A. Mark Payne
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Yi‐Pei Li
- Department of Chemical Engineering National Taiwan University Taipei Taiwan
| | - Xiaorui Dong
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Kevin A. Spiekermann
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Haoyang Wu
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Enoch E. Dames
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Zachary J. Buras
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Nick M. Vandewiele
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Nathan W. Yee
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Shamel S. Merchant
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Beat Buesser
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Caleb A. Class
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | | | - Richard H. West
- Department of Chemical Engineering Northeastern University Boston Massachusetts USA
| | - William H. Green
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
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7
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Amić A, Cagardová DM. Mactanamide and lariciresinol as radical scavengers and Fe 2+ ion chelators - A DFT study. PHYTOCHEMISTRY 2022; 204:113442. [PMID: 36150528 DOI: 10.1016/j.phytochem.2022.113442] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 09/13/2022] [Accepted: 09/14/2022] [Indexed: 06/16/2023]
Abstract
A DFT based kinetic study of OOH radical scavenging potency of mactanamide (MA) and lariciresinol (LA), two natural polyphenols, indicates their nearly equal potential via the proton coupled electron transfer (PCET) mechanism in lipid media. Contribution of C-H bond breaking to this potency is negligible compared to O-H bond breaking, contrary to recent claims. The predicted potency of both compounds is not sufficient to protect biological molecules from oxidative damage in lipid media. In aqueous media, the scavenging potency of MA and LA phenoxide anions via the single electron transfer (SET) mechanism is much higher and may contribute to the protection of lipids, proteins, and DNA from OOH radical damage. Also, MA and LA have the potential to chelate catalytic Fe2+ ions, thus suppressing the formation of dangerous OH radicals via Fenton-type reactions. The monoanionic species of MA and LA show stronger monodentate chelating ability with Fe2+ ion compared to its neutral form. The dianionic specie LA2- exhibited the highest chelation ability with Fe2+ ion via bidentate 1:2 coordination. However, direct radical scavenging and metal chelation could be rarely operative in vivo because MA and LA presumably achieve very low concentrations in systemic circulation.
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Affiliation(s)
- Ana Amić
- Department of Chemistry, Josip Juraj Strossmayer University of Osijek, Ulica Cara Hadrijana 8A, Osijek, 31000, Croatia.
| | - Denisa Mastiľák Cagardová
- Institute of Physical Chemistry and Chemical Physics, Department of Chemical Physics, Slovak University of Technology in Bratislava, Radlinského 9, Bratislava, SK-812 37, Slovak Republic
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8
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Amić A, Mastiľák Cagardová D. DFT Study of the Direct Radical Scavenging Potency of Two Natural Catecholic Compounds. Int J Mol Sci 2022; 23:ijms232214497. [PMID: 36430975 PMCID: PMC9697371 DOI: 10.3390/ijms232214497] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Revised: 11/17/2022] [Accepted: 11/19/2022] [Indexed: 11/23/2022] Open
Abstract
To ascertain quercetin's and rooperol's potency of H-atom donation to CH3OO• and HOO•, thermodynamics, kinetics and tunnelling, three forms of chemical reaction control, were theoretically examined. In lipid media, H-atom donation from quercetin's catecholic OH groups via the proton-coupled electron transfer (PCET) mechanism, is more relevant than from C-ring enolic moiety. Amongst rooperol's two catecholic moieties, H-atom donation from A-ring OH groups is favored. Allylic hydrogens of rooperol are poorly abstractable via the hydrogen atom transfer (HAT) mechanism. Kinetic analysis including tunnelling enables a more reliable prediction of the H-atom donation potency of quercetin and rooperol, avoiding the pitfalls of a solely thermodynamic approach. Obtained results contradict the increasing number of misleading statements about the high impact of C-H bond breaking on polyphenols' antioxidant potency. In an aqueous environment at pH = 7.4, the 3-O- phenoxide anion of quercetin and rooperol's 4'-O- phenoxide anion are preferred sites for CH3OO• and HOO• inactivation via the single electron transfer (SET) mechanism.
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Affiliation(s)
- Ana Amić
- Department of Chemistry, Josip Juraj Strossmayer University of Osijek, Ulica cara Hadrijana 8A, 31000 Osijek, Croatia
- Correspondence: ; Tel.: +381-31-399-980
| | - Denisa Mastiľák Cagardová
- Institute of Physical Chemistry and Chemical Physics, Department of Chemical Physics, Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37 Bratislava, Slovakia
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9
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Zhao Q, Møller KH, Chen J, Kjaergaard HG. Cost-Effective Implementation of Multiconformer Transition State Theory for Alkoxy Radical Unimolecular Reactions. J Phys Chem A 2022; 126:6483-6494. [PMID: 36053271 DOI: 10.1021/acs.jpca.2c04328] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Alkoxy radicals are important intermediates in the gas-phase oxidation of volatile organic compounds (VOCs) determining the nature of the first-generation products. An accurate description of their chemistry under atmospheric conditions is essential for understanding the atmospheric oxidation of VOCs. Unfortunately, experimental measurements of the rate coefficients of unimolecular alkoxy radical reactions are scarce, especially for larger systems. As has previously been done for peroxy radical hydrogen shift reactions, we present a cost-effective approach to the practical implementation of multiconformer transition state theory (MC-TST) for alkoxy radical unimolecular (H-shift and decomposition) reactions. Specifically, we test the optimal approach for the conformational sampling as well as the best value for a cutoff of high-energy conformers. In order to obtain accurate rate coefficients at a reduced computational cost, an energy cutoff is employed to reduce the required number of high-level calculations. The rate coefficients obtained with the developed theoretical approach are compared to available experimental rate coefficients for both 1,5 H-shifts and decomposition reactions. For all but one of the reactions tested, the calculated MC-TST rate coefficients agree with experimental results to within a factor of 7. The discrepancy for the final reaction is about a factor of 15, but part of the discrepancy is caused by pressure effects, which are not included in MC-TST. Thus, for the fastest alkoxy reactions, deviation from the high-pressure limit even at 1 bar should be considered.
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Affiliation(s)
- Qian Zhao
- State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Shanxi, Xi'an710049, China.,Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen Ø, Denmark
| | - Kristian H Møller
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen Ø, Denmark
| | - Jing Chen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen Ø, Denmark
| | - Henrik G Kjaergaard
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100, Copenhagen Ø, Denmark
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10
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Baradyn M, Ratkiewicz A. On-The-Fly Kinetics of the Hydrogen Abstraction by Hydroperoxyl Radical: An Application of the Reaction Class Transition State Theory. Front Chem 2022; 9:806873. [PMID: 35174142 PMCID: PMC8841336 DOI: 10.3389/fchem.2021.806873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 12/22/2021] [Indexed: 11/23/2022] Open
Abstract
A Reaction Class Transition State Theory (RC-TST) is applied to calculate thermal rate constants for hydrogen abstraction by OOH radical from alkanes in the temperature range of 300–2500 K. The rate constants for the reference reaction C2H6 + ∙OOH → ∙C2H5 + H2O2, is obtained with the Canonical Variational Transition State Theory (CVT) augmented with the Small Curvature Tunneling (SCT) correction. The necessary parameters were obtained from M06-2X/aug-cc-pVTZ data for a training set of 24 reactions. Depending on the approximation employed, only the reaction energy or no additional parameters are needed to predict the RC-TST rates for other class representatives. Although each of the reactions can in principle be investigated at higher levels of theory, the approach provides a nearly equally reliable rate constant at a fraction of the cost needed for larger and higher level calculations. The systematic error is smaller than 50% in comparison with high level computations. Satisfactory agreement with literature data, augmented by the lack of necessity of tedious and time consuming transition state calculations, facilitated the seamless application of the proposed methodology to the Automated Reaction Mechanism Generators (ARMGs) programs.
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11
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Burke AD, Bowman MC, Turney JM, Schaefer HF. Energetics and kinetics of various cyano radical hydrogen abstractions. Phys Chem Chem Phys 2021; 23:3389-3400. [PMID: 33506852 DOI: 10.1039/d0cp06228f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The cyano radical (CN) is an abundant, open-shell molecule found in a variety of environments, including the atmosphere, the interstellar medium and combustion processes. In these environments, it often reacts with small, closed-shell molecules via hydrogen abstraction. Both carbon and nitrogen atoms of the cyano radical are reactive sites, however the carbon is more reactive with reaction barrier heights generally between 2-15 kcal mol-1 lower than those of the analogous nitrogen. The CN + HX → HCN/HNC + X, with X = H, CH3, NH2, OH, F, SiH3, PH2, SH, Cl, C2H, CN reactions have been studied at a high-level of theory, including CCSD(T)-F12a. Furthermore, kinetics were obtained over the 100-1000 K temperature range, showing excellent agreement with those rate constants that have been determined experimentally.
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Affiliation(s)
- Alexandra D Burke
- Center for Computational Quantum Chemistry, University of Georgia, 140 Cedar Street, Athens, Georgia 30602, USA.
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12
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Møller KH, Berndt T, Kjaergaard HG. Atmospheric Autoxidation of Amines. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:11087-11099. [PMID: 32786344 DOI: 10.1021/acs.est.0c03937] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Autoxidation has been acknowledged as a major oxidation pathway in a broad range of atmospherically important compounds including isoprene, monoterpenes, and very recently, dimethyl sulfide. Here, we present a high-level theoretical multiconformer transition-state theory study of the atmospheric autoxidation in amines exemplified by the atmospherically important trimethylamine (TMA) and dimethylamine and generalized by the study of the larger diethylamine. Overall, we find that the initial hydrogen shift reactions have rate coefficients greater than 0.1 s-1 and autoxidation is thus an important atmospheric pathway for amines. This autoxidation efficiently leads to the formation of hydroperoxy amides, a new type of atmospheric nitrogen-containing compounds, and for TMA, we experimentally confirm this. The conversion of amines to hydroperoxy amides may have important implications for nucleation and growth of atmospheric secondary organic aerosols and atmospheric OH recycling.
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Affiliation(s)
- Kristian H Møller
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
| | - Torsten Berndt
- Atmospheric Chemistry Department (ACD), Leibniz Institute for Tropospheric Research (TROPOS), Permoserstraße 15, 04318 Leipzig, Germany
| | - Henrik G Kjaergaard
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
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13
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Bowman MC, Burke AD, Turney JM, Schaefer III HF. Conclusive determination of ethynyl radical hydrogen abstraction energetics and kinetics*. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1769214] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Michael C. Bowman
- Center for Computational Quantum Chemistry, University of Georgia, Athens, GA, USA
- Department of Chemistry and Biochemistry, Taylor University, Upland, IN, USA
| | - Alexandra D. Burke
- Center for Computational Quantum Chemistry, University of Georgia, Athens, GA, USA
| | - Justin M. Turney
- Center for Computational Quantum Chemistry, University of Georgia, Athens, GA, USA
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14
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Cao XM, Li ZR, Wang JB, Li XY. Rate rules for hydrogen abstraction reaction kinetics of alkenes from allylic sites by HO2 radical. COMPUT THEOR CHEM 2020. [DOI: 10.1016/j.comptc.2020.112795] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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15
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Rate rules for hydrogen abstraction reaction kinetics of polycyclic aromatic hydrocarbons and vinyl radical. Theor Chem Acc 2020. [DOI: 10.1007/s00214-020-02612-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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16
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Power J, Somers KP, Zhou CW, Peukert S, Curran HJ. Theoretical, Experimental, and Modeling Study of the Reaction of Hydrogen Atoms with 1- and 2-Pentene. J Phys Chem A 2019; 123:8506-8526. [PMID: 31502844 DOI: 10.1021/acs.jpca.9b06378] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Alkyl radicals are prominent in combustion chemistry as they are formed by hydrocarbon decomposition or from a radical attack on hydrocarbons. Accurate determinations of the thermochemistry and kinetics of their unimolecular isomerization and decomposition reactions and related addition reactions of alkenes are therefore important in simulating the combustion chemistry of virtually all hydrocarbon fuels. In this work, a comprehensive potential energy surface (PES) for Ḣ-atom addition to and abstraction from 1- and 2-pentene, and the subsequent C-C and C-H β-scission reactions, and H-atom transfer reactions has been considered. Thermochemical values for the species on the Ċ5H11 PES were calculated as a function of temperature (298-2000 K), with enthalpies of formation determined using a network of isodesmic reactions. High-pressure limiting and pressure-dependent rate constants were calculated using the Rice-Ramsperger-Kassel-Marcus theory coupled with a one-dimensional master equation. As a validation of our theoretical results, hydrogen atomic resonance absorption spectrometry experiments were performed on the Ḣ-atom addition and abstraction reactions of 1- and 2-pentene. By incorporating our calculations into a detailed chemical kinetic model (AramcoMech 3.0), excellent agreement with these experiments is observed. The theoretical results are further validated via a comprehensive series of simulations of literature data. Our a priori model is found to reproduce important absolute species concentrations and product ratios reported therein.
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Affiliation(s)
- Jennifer Power
- Combustion Chemistry Centre, School of Chemistry & Ryan Institute , National University of Ireland , Galway H91TK33 , Ireland
| | - Kieran P Somers
- Combustion Chemistry Centre, School of Chemistry & Ryan Institute , National University of Ireland , Galway H91TK33 , Ireland
| | - Chong-Wen Zhou
- Combustion Chemistry Centre, School of Chemistry & Ryan Institute , National University of Ireland , Galway H91TK33 , Ireland.,School of Energy and Power Engineering , Beihang University , Beijing 100191 , P. R. China
| | - Sebastian Peukert
- Institute for Combustion and Gas Dynamics-Reactive Fluids , University of Duisburg-Essen , 47058 Duisburg , Germany
| | - Henry J Curran
- Combustion Chemistry Centre, School of Chemistry & Ryan Institute , National University of Ireland , Galway H91TK33 , Ireland
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17
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Otukile KP, Kabanda MM. A DFT mechanistic, thermodynamic and kinetic study on the reaction of 1, 3, 5-trihydroxybenzene and 2, 4, 6-trihydroxyacetophenone with •OOH in different media. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2019. [DOI: 10.1142/s0219633619500238] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A theoretical investigation on the reactions of 1, 3, 5-trihydroxybenzene (PG) and 2, 4, 6-trihydroxyacetophenone (ACPG) with •OOH has been performed with the aim of elucidating the peroxyl radical scavenging properties of PG and its acylated derivative. The study has considered the hydrogen atom transfer (HAT), the single electron transfer-proton transfer and the sequential proton loss-electron transfer mechanisms and determined the geometric, energetic and electronic properties of the reaction species as well as the kinetic parameters for the HAT mechanism. DFT/M06-2X, DFT/MPW1K and DFT/BHHLYP calculation methods have been utilized in combination with the 6-311++G(3df, 2p) basis set. The DFT methods were benchmarked using the CBS-QB3 method. Thermodynamic parameters such as bond dissociation enthalpy (BDE) and ionization energy suggest that the thermodynamically preferred mechanism is the HAT mechanism. The geometric, electronic and energetic parameters suggest that the preferred site for the abstraction of the free phenolic H atom in ACPG is the ortho position. Spin density and branching ratio values indicate that the most stable and preferable product formed is for the reaction of ACPG [Formula: see text] •OOH at the ortho position. The estimated rate constants obtained indicate that the reaction of ACPG [Formula: see text] •OOH is kinetically preferred to the reaction of PG [Formula: see text] •OOH, which is in agreement with experimental findings.
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Affiliation(s)
- Kgalaletso P. Otukile
- Department of Chemistry, Faculty of Natural and Agriculture Sciences, North-West University, Private Bag X2046, Mmabatho 2735, South Africa
- Material Science Innovation and Modelling (MaSIM), Research Focus Area, Faculty of Natural and Agriculture Sciences, North-West University, Private Bag X 2046, Mmabatho 2735, South Africa
| | - Mwadham M. Kabanda
- Department of Chemistry, Faculty of Natural and Agriculture Sciences, North-West University, Private Bag X2046, Mmabatho 2735, South Africa
- Material Science Innovation and Modelling (MaSIM), Research Focus Area, Faculty of Natural and Agriculture Sciences, North-West University, Private Bag X 2046, Mmabatho 2735, South Africa
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18
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Li X, York DM, Meyer MP. Quantum Suppression of Intramolecular Deuterium Kinetic Isotope Effects in a Pericyclic Hydrogen Transfer Reaction. J Phys Chem A 2019; 123:3647-3654. [PMID: 30855141 DOI: 10.1021/acs.jpca.9b00172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
It is generally accepted that hydrogen tunneling enhances both primary and secondary H/D kinetic isotope effects (KIEs) over what would be expected under the assumptions of classical barrier transition. Previous studies have exclusively shown that the effects of tunneling upon primary H/D KIEs have been much larger than those observed for secondary H/D KIEs. Here we present a series of experimental H/D KIE results associated with the Chugaev elimination of methyl xanthate derived from β-phenylethanol over the temperature range of 180 to 290 °C. Intramolecular H/D KIEs computed according to classical transition state theory (TST) are markedly overestimated relative to experimentally measured values. Experimental intermolecular H/D KIEs and direct dynamic calculations based on canonical variational transition state theory (CVT) with small-curvature tunneling correction (SCT) reveal that this result is largely the consequence of extraordinary tunneling enhancement of the secondary H/D KIE. This unexpected behavior is examined in the context of other similar hydrogen transfer reactions.
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Affiliation(s)
- Xiao Li
- Laboratory for Biomolecular Simulation Research, Center for Integrative Proteomics Research, and Department of Chemistry and Chemical Biology , Rutgers University , Piscataway , New Jersey 08854-8087 , United States
| | - Darrin M York
- Laboratory for Biomolecular Simulation Research, Center for Integrative Proteomics Research, and Department of Chemistry and Chemical Biology , Rutgers University , Piscataway , New Jersey 08854-8087 , United States
| | - Matthew P Meyer
- Department of Chemistry and Chemical Biology , University of California , Merced , California 95343 , United States
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19
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Park BW, Seok SI. Intrinsic Instability of Inorganic-Organic Hybrid Halide Perovskite Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1805337. [PMID: 30773706 DOI: 10.1002/adma.201805337] [Citation(s) in RCA: 108] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 09/29/2018] [Indexed: 05/21/2023]
Abstract
Hybrid lead halide perovskite materials are used in solar cells and show efficiencies greater than 23%. Furthermore, they are applied in light-emitting diodes, X-ray detectors, thin-film transistors, thermoelectrics, and memory devices. Lead trihalide hybrid materials contain methylammonium (MA) or formamidinium (FA) (or a mixture), or long alkylammonium halides, as alternative organic cations. However, the intrinsic stability of hybrid lead halide perovskites is not very high, and they are chemically unstable when exposed to moisture, light, or heat because of their organic contents and low formation energies. Therefore, although improvements in the chemical stability are crucial, changing the material composition is challenging because it is directly related to the desired application requirements. Fortunately, hybrid lead halide perovskites have a very high tolerance toward changes in physical properties arising from doping or addition of different cations and anions, in many cases showing improved properties. Here, the intrinsic instability of hybrid lead halide perovskites is reviewed in relation to the crystal phase and chemical stability. It is suggested that FA should be used for lead halide perovskites for chemical stability instead of MA. Furthermore, additives that stabilize the crystal phase with α-FAPbI3 should eschew MA.
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Affiliation(s)
- Byung-Wook Park
- Department of Energy Engineering, Perovtronics Research Center, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan, 44919, Republic of Korea
| | - Sang Il Seok
- Department of Energy Engineering, Perovtronics Research Center, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan, 44919, Republic of Korea
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20
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Meng Q, Chi Y, Zhang L, Zhang P, Sheng L. Towards high-level theoretical studies of large biodiesel molecules: an ONIOM/RRKM/Master-equation approach to the isomerization and dissociation kinetics of methyl decanoate radicals. Phys Chem Chem Phys 2019; 21:5232-5242. [PMID: 30775733 DOI: 10.1039/c8cp05593a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The isomerization and dissociation reactions of methyl decanoate (MD) radicals were theoretically investigated by using high-level theoretical calculations based on a two-layer ONIOM method, employing the QCISD(T)/CBS method for the high layer and the M06-2X/6-311++G(d,p) method for the low layer. Temperature- and pressure-dependent rate coefficients for the involved reactions were computed by using the transition state theory and the Rice-Ramsperger-Kassel-Marcus/Master-equation method. The structure-reactivity relationships were explored for the complicated multiple-well interconnected system of ten isomeric MD radicals. Comparative studies of methyl butanoate (MB) and MD were also performed systematically. Results show that the isomerization reactions are appreciably responsible for the population distribution of MD radicals at low and intermediate temperatures, while the β-scission reactions are dominant at higher temperatures. Although the rate constants of MB specific to methyl esters are close to those of MD in certain temperature ranges, MB is unable to simulate most of the dissociation reactions due to its short aliphatic chain. Significant differences of rate constants for isomerization reactions were observed between the calculated results and the literature data, which were estimated by analogy to alkane systems, but the rate constants of β-scissions show generally good agreement between theory and experiment. The current work extends kinetic data for isomerization and dissociation reactions of MD radicals, and it serves as a reference for the studies of detailed combustion chemistry of practical biodiesels.
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Affiliation(s)
- Qinghui Meng
- Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
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21
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Bracco P, Costa L, Luda MP, Billingham N. A review of experimental studies of the role of free-radicals in polyethylene oxidation. Polym Degrad Stab 2018. [DOI: 10.1016/j.polymdegradstab.2018.07.011] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Wang QD, Liu ZW. Reaction Kinetics of Hydrogen Atom Abstraction from C4-C6 Alkenes by the Hydrogen Atom and Methyl Radical. J Phys Chem A 2018; 122:5202-5210. [PMID: 29791159 DOI: 10.1021/acs.jpca.8b03659] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Alkenes are important ingredients of realistic fuels and are also critical intermediates during the combustion of a series of other fuels including alkanes, cycloalkanes, and biofuels. To provide insights into the combustion behavior of alkenes, detailed quantum chemical studies for crucial reactions are desired. Hydrogen abstractions of alkenes play a very important role in determining the reactivity of fuel molecules. This work is motivated by previous experimental and modeling evidence that current literature rate coefficients for the abstraction reactions of alkenes are still in need of refinement and/or redetermination. In light of this, this work reports a theoretical and kinetic study of hydrogen atom abstraction reactions from C4-C6 alkenes by the hydrogen (H) atom and methyl (CH3) radical. A series of C4-C6 alkene molecules with enough structural diversity are taken into consideration. Geometry and vibrational properties are determined at the B3LYP/6-31G(2df,p) level implemented in the Gaussian-4 (G4) composite method. The G4 level of theory is used to calculate the electronic single point energies for all species to determine the energy barriers. Conventional transition state theory with Eckart tunneling corrections is used to determine the high-pressure-limit rate constants for 47 elementary reaction rate coefficients. To faciliate their applications in kinetic modeling, the obtained rate constants are given in the Arrhenius expression and rate coefficients for typical reaction classes are recommended. The overall rate coefficients for the reaction of H atom and CH3 radical with all the studied alkenes are also compared. Branching ratios of these reaction channels for certain alkenes have also been analyzed.
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Affiliation(s)
- Quan-De Wang
- Low Carbon Energy Institute and School of Chemical Engineering , China University of Mining and Technology , Xuzhou 221008 , Jiangsu People's Republic of China
| | - Zi-Wu Liu
- Low Carbon Energy Institute and School of Chemical Engineering , China University of Mining and Technology , Xuzhou 221008 , Jiangsu People's Republic of China
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23
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Van de Vijver R, Sabbe MK, Reyniers MF, Van Geem KM, Marin GB. Ab initio derived group additivity model for intramolecular hydrogen abstraction reactions. Phys Chem Chem Phys 2018. [PMID: 29517772 DOI: 10.1039/c7cp07771h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A set of group additivity values for intramolecular hydrogen abstraction reactions of alkanes, alkenes and alkynes is reported. Calculating 448 reaction rate coefficients at the CBS-QB3 level of theory for 1-2 up to 1-7 hydrogen shift reactions allowed the estimation of ΔGAV° values for 270 groups. The influence of substituents on (1) the attacking radical, (2) the attacked carbon atom, and (3) the carbon chain between the attacking and attacked reactive atom has been systematically studied. Substituents have been varied between hydrogen atoms and sp3, sp2 and sp hybridized carbon atoms. It has been assumed that substituents further away from the reactive atoms or their connecting carbon chain have negligible influences on the kinetics. This group additivity model is applicable to a wide variety of reactions in the 300-1800 K temperature range. Correlations for tunneling coefficients have been generated which are complementary to the ΔGAV°'s to obtain accurate rate coefficients without the need for imaginary frequencies or electronic energies of activation. These correlations depend on the temperature and activation energy of the exothermic step. The group additivity model has been successfully applied to a test set of reactions also calculated at the CBS-QB3 level of theory. A mean absolute deviation of 1.18 to 1.71 has been achieved showing a good overall accuracy of the model.
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Affiliation(s)
- Ruben Van de Vijver
- Ghent University, Laboratory for Chemical Technology, Technologiepark 914, Ghent, Belgium.
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24
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Affiliation(s)
- Jeffrey A. Manion
- Chemical Sciences Division; National Institute of Standards and Technology; Gaithersburg MD 20899-8320
| | - Iftikhar A. Awan
- Chemical Sciences Division; National Institute of Standards and Technology; Gaithersburg MD 20899-8320
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25
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Arif T, Borie C, Jean M, Vanthuyne N, Bertrand MP, Siri D, Nechab M. Organocopper triggered cyclization of conjugated dienynes via tandem SN2′/Alder-ene reaction. Org Chem Front 2018. [DOI: 10.1039/c7qo00288b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Propargylic carbonates were converted to indenes through a SN2′/Alder-ene cascade triggered by organocopper reagents.
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Affiliation(s)
| | | | - Marion Jean
- Aix-Marseille Univ
- Centrale Marseille
- CNRS
- iSm2
- Marseille
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26
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Ryazantsev SV, Feldman VI, Khriachtchev L. Conformational Switching of HOCO Radical: Selective Vibrational Excitation and Hydrogen-Atom Tunneling. J Am Chem Soc 2017. [DOI: 10.1021/jacs.7b02605] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sergey V. Ryazantsev
- Department
of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki FIN-00014, Finland
| | - Vladimir I. Feldman
- Department
of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Leonid Khriachtchev
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki FIN-00014, Finland
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27
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Parab PR, Sakade N, Sakai Y, Fernandes R, Heufer KA. A Computational Kinetics Study on the Intramolecular Hydrogen Shift Reactions of Alkylperoxy Radicals in 2-Methyltetrahydrofuran Oxidation. INT J CHEM KINET 2017. [DOI: 10.1002/kin.21087] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Prajakta R. Parab
- Physico Chemical Fundamentals of Combustion; RWTH Aachen University; Templergraben 55 52056 Aachen Germany
| | | | | | - Ravi Fernandes
- Physikalish Technische Budesanstalt (PTB); 38116 Braunschweig Germany
| | - K. Alexander Heufer
- Physico Chemical Fundamentals of Combustion; RWTH Aachen University; Templergraben 55 52056 Aachen Germany
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28
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Wang R, Jia ZL, An YM, Zhang TL, Wang ZY, Roy S. Catalytic effect of water, water dimer, water trimer, HCOOH, H2SO4, CH3CH2COOH and HN(NO2)2 on the isomerisation of HN(NO2)2 to O2NNN(O)OH: a mechanism study. Mol Phys 2017. [DOI: 10.1080/00268976.2017.1301589] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Rui Wang
- Shaanxi Key Laboratory of Catalysis, School of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong, Shaanxi, P.R. China
| | - Zi-long Jia
- Shaanxi Key Laboratory of Catalysis, School of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong, Shaanxi, P.R. China
| | - Yi-ming An
- Shaanxi Key Laboratory of Catalysis, School of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong, Shaanxi, P.R. China
| | - Tian-lei Zhang
- Shaanxi Key Laboratory of Catalysis, School of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong, Shaanxi, P.R. China
| | - Zhi-yin Wang
- Shaanxi Key Laboratory of Catalysis, School of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong, Shaanxi, P.R. China
| | - Soumendra Roy
- Shaanxi Key Laboratory of Catalysis, School of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong, Shaanxi, P.R. China
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29
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Wang R, Li Y, Feng X, Zhang K, Kumar RS, Dong T, Xu Q, Wang Z, Zhang T, Wang Z. Computational study on the mechanism and kinetics for the reaction between HCHO and HO 2. MOLECULAR SIMULATION 2017. [DOI: 10.1080/08927022.2017.1303686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Rui Wang
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, P.R. China
| | - Yili Li
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, P.R. China
| | - Xukai Feng
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, P.R. China
| | - Kai Zhang
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, P.R. China
| | - Roy Soumendra Kumar
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, P.R. China
| | - Ting Dong
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, P.R. China
| | - Qiong Xu
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, P.R. China
| | - Zhiyin Wang
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, P.R. China
| | - Tianlei Zhang
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi University of Technology, Hanzhong, P.R. China
| | - Zhuqing Wang
- Analytical and Testing Center, Sichuan University of Science & Engineering, Zigong, P.R. China
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30
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Wang R, Lei L, Wang XG, Lu YS, Song L, Ge HG, Shao XZ, Wang ZY, Zhang TL, Wang WL. Theoretical kinetic investigation of thermal decomposition of nitropropane. Struct Chem 2016. [DOI: 10.1007/s11224-016-0834-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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31
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Dames EE, Green WH. The Effect of Alcohol and Carbonyl Functional Groups on the Competition between Unimolecular Decomposition and Isomerization in C4and C5Alkoxy Radicals. INT J CHEM KINET 2016. [DOI: 10.1002/kin.21015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Enoch E. Dames
- Department of Chemical Engineering; Massachusetts Institute of Technology; Cambridge MA 02139
| | - William H. Green
- Department of Chemical Engineering; Massachusetts Institute of Technology; Cambridge MA 02139
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32
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Theoretical and kinetic study of the hydrogen atom abstraction reactions of unsaturated C6 methyl esters with hydroxyl radical. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.02.071] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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34
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Antioxidant activity of mildbone and mildbenone secondary metabolites of Erythrina mildbraedii Harms: A theoretical approach. COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2015.11.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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35
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Bian H, Wang Z, Zhang F, Wang Z, Zhu J. Unimolecular Reaction Properties for the Long-Chain Alkenyl Radicals. INT J CHEM KINET 2015. [DOI: 10.1002/kin.20941] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Huiting Bian
- State Key Laboratory of Fire Science; University of Science and Technology of China; Hefei Anhui 230026 People's Republic of China
| | - Zhaohui Wang
- National Synchrotron Radiation Laboratory; University of Science and Technology of China; Hefei Anhui 230029 People's Republic of China
| | - Feng Zhang
- National Synchrotron Radiation Laboratory; University of Science and Technology of China; Hefei Anhui 230029 People's Republic of China
| | - Zhandong Wang
- National Synchrotron Radiation Laboratory; University of Science and Technology of China; Hefei Anhui 230029 People's Republic of China
| | - Jiping Zhu
- State Key Laboratory of Fire Science; University of Science and Technology of China; Hefei Anhui 230026 People's Republic of China
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36
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Wang K, Villano SM, Dean AM. The Impact of Resonance Stabilization on the Intramolecular Hydrogen-Atom Shift Reactions of Hydrocarbon Radicals. Chemphyschem 2015. [DOI: 10.1002/cphc.201500396] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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37
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Theoretical study on the thermal decomposition and isomerization of 3-Me-1-heptyl radical. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.04.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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38
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Guo J, Xu J, Li Z, Tan N, Li X. Temperature and pressure dependent rate coefficients for the reaction of C2H4 + HO2 on the C2H4O2H potential energy surface. J Phys Chem A 2015; 119:3161-70. [PMID: 25774424 DOI: 10.1021/jp511991n] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The potential energy surface (PES) for reaction C2H4 + HO2 was examined by using the quantum chemical methods. All rates were determined computationally using the CBS-QB3 composite method combined with conventional transition state theory(TST), variational transition-state theory (VTST) and Rice-Ramsberger-Kassel-Marcus/master-equation (RRKM/ME) theory. The geometries optimization and the vibrational frequency analysis of reactants, transition states, and products were performed at the B3LYP/CBSB7 level. The composite CBS-QB3 method was applied for energy calculations. The major product channel of reaction C2H4 + HO2 is the formation C2H4O2H via an OH(···)π complex with 3.7 kcal/mol binding energy which exhibits negative-temperature dependence. We further investigated the reactions related to this complex, which were ignored in previous studies. Thermochemical properties of the species involved in the reactions were determined using the CBS-QB3 method, and enthalpies of formation of species were compared with literature values. The calculated rate constants are in good agreement with those available from literature and given in modified Arrhenius equation form, which are serviceable in combustion modeling of hydrocarbons. Finally, in order to illustrate the effect for low-temperature ignition of our new rate constants, we have implemented them into the existing mechanisms, which can predict ethylene ignition in a shock tube with better performance.
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Affiliation(s)
- JunJiang Guo
- †College of Chemical Engineering, Sichuan University, Chengdu 610065, P.R. China
| | - JiaQi Xu
- ‡College of Chemistry, Sichuan University, Chengdu 610064, P.R. China
| | - ZeRong Li
- ‡College of Chemistry, Sichuan University, Chengdu 610064, P.R. China
| | - NingXin Tan
- †College of Chemical Engineering, Sichuan University, Chengdu 610065, P.R. China
| | - XiangYuan Li
- †College of Chemical Engineering, Sichuan University, Chengdu 610065, P.R. China
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39
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Wang K, Villano SM, Dean AM. Reactivity–Structure-Based Rate Estimation Rules for Alkyl Radical H Atom Shift and Alkenyl Radical Cycloaddition Reactions. J Phys Chem A 2015; 119:7205-21. [DOI: 10.1021/jp511017z] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kun Wang
- Chemical and Biological Engineering Department, Colorado School of Mines, Olden, Colorado 80401, United States
| | - Stephanie M. Villano
- Chemical and Biological Engineering Department, Colorado School of Mines, Olden, Colorado 80401, United States
| | - Anthony M. Dean
- Chemical and Biological Engineering Department, Colorado School of Mines, Olden, Colorado 80401, United States
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40
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Wang K, Villano SM, Dean AM. Reactions of allylic radicals that impact molecular weight growth kinetics. Phys Chem Chem Phys 2015; 17:6255-73. [DOI: 10.1039/c4cp05308g] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactions of allylic radicals have the potential to play a critical role in molecular weight growth (MWG) kinetics during hydrocarbon oxidation and/or pyrolysis.
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Affiliation(s)
- Kun Wang
- Chemical and Biological Engineering Department
- Colorado School of Mines
- Golden
- USA
| | | | - Anthony M. Dean
- Chemical and Biological Engineering Department
- Colorado School of Mines
- Golden
- USA
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41
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Chen L, Wang W, Wang W, Li C, Liu F, Lü J. Kinetic and mechanistic investigations of the thermal decomposition of methyl-substituted cycloalkyl radicals. RSC Adv 2015. [DOI: 10.1039/c5ra02525g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
We perform systemic theoretical investigations on the thermal decomposition of 2-Me-cyclobutyl, 2-Me-cyclopentyl and 2-Me-cyclohexyl radicals at CBS-QB3 and CCSD(T) levels.
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Affiliation(s)
- Long Chen
- School of Chemistry and Chemical Engineering
- Key Laboratory for Macromolecular Science of Shaanxi Province
- Shaanxi Normal University
- Xi'an
- People's Republic of China
| | - Wenliang Wang
- School of Chemistry and Chemical Engineering
- Key Laboratory for Macromolecular Science of Shaanxi Province
- Shaanxi Normal University
- Xi'an
- People's Republic of China
| | - Weina Wang
- School of Chemistry and Chemical Engineering
- Key Laboratory for Macromolecular Science of Shaanxi Province
- Shaanxi Normal University
- Xi'an
- People's Republic of China
| | - Chunying Li
- Xi'an Modern Chemistry Research Institute
- Xi'an 710065
- People's Republic of China
| | - Fengyi Liu
- School of Chemistry and Chemical Engineering
- Key Laboratory for Macromolecular Science of Shaanxi Province
- Shaanxi Normal University
- Xi'an
- People's Republic of China
| | - Jian Lü
- Xi'an Modern Chemistry Research Institute
- Xi'an 710065
- People's Republic of China
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42
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Wang QD, Zhang W. Influence of the double bond on the hydrogen abstraction reactions of methyl esters with hydrogen radical: an ab initio and chemical kinetic study. RSC Adv 2015. [DOI: 10.1039/c5ra14880d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This work reports a systematic ab initio and chemical kinetic study of the rate constants for hydrogen atom abstraction reactions by hydrogen radical on the isomers of unsaturated C6 methyl esters.
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Affiliation(s)
- Quan-De Wang
- Low Carbon Energy Institute
- China University of Mining and Technology
- Xuzhou 221008
- People's Republic of China
| | - Weidong Zhang
- Wuhan Institute of Marine Electric Propulsion
- CSIC
- Wuhan 430064
- People's Republic of China
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43
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Chen L, Wang W, Li C, Lü J, Wang W. Thermal decomposition and isomerization of 1-heptyl radical: a computational investigation. Theor Chem Acc 2014. [DOI: 10.1007/s00214-014-1509-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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44
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KANNO NOZOMU, TERASHIMA HIROSHI, DAIMON YU, YOSHIKAWA NORIHIKO, KOSHI MITSUO. Theoretical Study of the Rate Coefficients for CH3NHNH2+ NO2and Related Reactions. INT J CHEM KINET 2014. [DOI: 10.1002/kin.20866] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- NOZOMU KANNO
- Department of Micro-Nano Systems Engineering; Nagoya University; Nagoya 464-8603 Japan
| | - HIROSHI TERASHIMA
- Department of Aeronautics and Astronautics; The University of Tokyo; Tokyo 113-8656 Japan
| | - YU DAIMON
- Japan Aerospace Exploration Agency; Ibaraki 305-8050 Japan
| | - NORIHIKO YOSHIKAWA
- Department of Micro-Nano Systems Engineering; Nagoya University; Nagoya 464-8603 Japan
| | - MITSUO KOSHI
- Graduate School of Environment and Information Sciences; Yokohama National University; Kanagawa 240-8501 Japan
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45
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Antioxidant activity of hispidin oligomers from medicinal fungi: a DFT study. Molecules 2014; 19:3489-507. [PMID: 24662069 PMCID: PMC6271270 DOI: 10.3390/molecules19033489] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Revised: 03/17/2014] [Accepted: 03/17/2014] [Indexed: 11/17/2022] Open
Abstract
Hispidin oligomers are styrylpyrone pigments isolated from the medicinal fungi Inonotus xeranticus and Phellinus linteus. They exhibit diverse biological activities and strong free radical scavenging activity. To rationalize the antioxidant activity of a series of four hispidin oligomers and determine the favored mechanism involved in free radical scavenging, DFT calculations were carried out at the B3P86/6-31+G (d, p) level of theory in gas and solvent. The results showed that bond dissociation enthalpies of OH groups of hispidin oligomers (ArOH) and spin density delocalization of related radicals (ArO•) are the appropriate parameters to clarify the differences between the observed antioxidant activities for the four oligomers. The effect of the number of hydroxyl groups and presence of a catechol moiety conjugated to a double bond on the antioxidant activity were determined. Thermodynamic and kinetic studies showed that the PC-ET mechanism is the main mechanism involved in free radical scavenging. The spin density distribution over phenoxyl radicals allows a better understanding of the hispidin oligomers formation.
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46
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Mavroudakis E, Cuccato D, Moscatelli D. Quantum Mechanical Investigation on Bimolecular Hydrogen Abstractions in Butyl Acrylate-Based Free Radical Polymerization Processes. J Phys Chem A 2014; 118:1799-806. [DOI: 10.1021/jp500082f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Evangelos Mavroudakis
- Dipartimento
di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, 20131 Milano, Italy
| | - Danilo Cuccato
- Institute
for Chemical and Bioengineering, Department of Chemistry and Applied
Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Davide Moscatelli
- Dipartimento
di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, 20131 Milano, Italy
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47
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Zhang T, Wang R, Zhou L, Wang Z, Xu Q, Min S, Wang W. A computational study on the mechanism and kinetics of the reaction between CH3CH2S and OH. RSC Adv 2014. [DOI: 10.1039/c4ra07780f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Addition–elimination channels CH3CHS + H2O, CH2CH2 + HSOH, CH3CHSO + H2 and CH3CH2SH + O are the major channels in the reaction between CH3CH2S and OH.
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Affiliation(s)
- Tianlei Zhang
- School of Chemical & Environment Science
- Shaanxi University of Technology
- Hanzhong, China
| | - Rui Wang
- School of Chemical & Environment Science
- Shaanxi University of Technology
- Hanzhong, China
| | - Liting Zhou
- School of Chemical & Environment Science
- Shaanxi University of Technology
- Hanzhong, China
| | - Zhiyin Wang
- School of Chemical & Environment Science
- Shaanxi University of Technology
- Hanzhong, China
| | - Qiong Xu
- School of Chemical & Environment Science
- Shaanxi University of Technology
- Hanzhong, China
| | - Suotian Min
- School of Chemical & Environment Science
- Shaanxi University of Technology
- Hanzhong, China
| | - Wenliang Wang
- Key Laboratory for Macromolecular Science of Shaanxi Province
- School of Chemistry & Chemical Engineering
- Shaanxi Normal University
- Xi'an, China
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48
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49
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Ratkiewicz A. First-principles kinetics of n-octyl radicals. PROGRESS IN REACTION KINETICS AND MECHANISM 2013. [DOI: 10.3184/146867813x13821154751099] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Kinetics of the isomerisation and unimolecular degradation of n-octyl radicals have been studied with the reaction class transition state theory (RC-TST) method. To explore the kinetics of the 1,7-H migration reactions family, the accurate high-pressure limits of the rate constants for the reference reaction of this class (1-heptyl → 1-heptyl) have been calculated. Finally, both the achievements reported in this paper and previous developments are employed to obtain theoretical branching ratios of intramolecular H-transfers and unimolecular degradations of all possible n-octyl radicals; the results are in satisfactory agreement when compared to experiment. The application of the rates obtained to the simulation of a simple reactor is also reported.
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Affiliation(s)
- Artur Ratkiewicz
- Chemistry Institute, University of Bialystok, Hurtowa 1 15-399 Bialystok, Poland
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