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Gál DR, Papp D, Czakó G. Benchmark ab initio characterization of the multi-channel Cl + CH 3X [X = F, Cl, Br, I] reactive potential energy surfaces. Phys Chem Chem Phys 2024; 26:17695-17706. [PMID: 38869051 DOI: 10.1039/d4cp01578a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2024]
Abstract
We determine benchmark geometries and relative energies for the stationary points of the Cl + CH3X [X = F, Cl, Br, I] reactions. We consider four possible reaction pathways: hydrogen abstraction, hydrogen substitution, halogen abstraction, and halogen substitution, where the substitution processes can proceed via either Walden inversion or front-side attack. We perform geometry optimizations and obtain harmonic vibrational frequencies at the explicitly-correlated UCCSD(T)-F12b/aug-cc-pVTZ level of theory, followed by UCCSD(T)-F12b/aug-cc-pVQZ single-point computations to make finite-basis-set error negligible. To reach chemical (<1 kcal mol-1), or even subchemical (<0.5 kcal mol-1) accuracy, we include core-correlation, scalar relativistic, post-(T), spin-orbit-splitting and zero-point-energy contributions, as well, in the relative energies of all the stationary points. Our benchmark 0 K reaction enthalpies are compared to available experimental results and show good agreement. The stationary-point structures and energetics are interpreted in terms of Hammond's postulate and used to make predictions related to the dynamical behavior of these reactive systems.
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Affiliation(s)
- Dorina R Gál
- MTA-SZTE Lendület Computational Reaction Dynamics Research Group, Interdisciplinary Excellence Centre and Department of Physical Chemistry and Materials Science, Institute of Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged H-6720, Hungary.
| | - Dóra Papp
- MTA-SZTE Lendület Computational Reaction Dynamics Research Group, Interdisciplinary Excellence Centre and Department of Physical Chemistry and Materials Science, Institute of Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged H-6720, Hungary.
| | - Gábor Czakó
- MTA-SZTE Lendület Computational Reaction Dynamics Research Group, Interdisciplinary Excellence Centre and Department of Physical Chemistry and Materials Science, Institute of Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged H-6720, Hungary.
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Galano A, Alvarez-Idaboy JR. Branching Ratios of Aliphatic Amines + OH Gas-Phase Reactions: A Variational Transition-State Theory Study. J Chem Theory Comput 2015; 4:322-7. [PMID: 26620664 DOI: 10.1021/ct7002786] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A theoretical study on the mechanism of the OH + aliphatic amines reactions is presented. Geometry optimization and frequencies calculations have been performed at the BHandHLYP/6-311++G(2d,2p) level of theory for all stationary points. Energy values have been improved by single-point calculations at the above geometries using CCSD(T) and the same basis set. All the possible hydrogen abstraction channels have been modeled, involving the rupture of C-H and N-H bonds. It was found that as the temperature decreases the contributions of the channels involving NH sites to the overall reaction also decrease, suggesting that for upper layers in the troposphere these channels become less important. Their percentage contributions to the overall reaction, at 298 K, were found to be about 20%, 2%, and 48% for methylamine, ethlylamine, and dimethylamine, respectively.
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Affiliation(s)
- Annia Galano
- Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, San Rafael Atlixco 186, Col. Vicentina, Iztapalapa, C. P. 09340 México D. F., México, and Facultad de Química, Departamento de Física y Química Teórica, Universidad Nacional Autónoma de México, México DF 04510, México
| | - J Raul Alvarez-Idaboy
- Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, San Rafael Atlixco 186, Col. Vicentina, Iztapalapa, C. P. 09340 México D. F., México, and Facultad de Química, Departamento de Física y Química Teórica, Universidad Nacional Autónoma de México, México DF 04510, México
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ARABIEH MASOUD, ZAHEDI MANSOUR. DUAL-LEVEL DIRECT DYNAMICS STUDIES ON THE HYDROGEN ABSTRACTION REACTION OF CF3CHFCF3 (HFC-227ea) WITH Cl ATOM. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2013. [DOI: 10.1142/s0219633612501192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The hydrogen abstraction reaction of CF3CHFCF3 (HFC-227ea) by Cl atom is studied theoretically over a temperature range of 50–2000 K. The reaction path information such as geometries, gradients, etc. are initially obtained at the BB1K/6-31+G (d,p) level. In order to improve the energies, high level single point energy (SPE) calculations are carried out at BB1K/MG3S on BB1K/6-31+G(d,p) geometries. The rate coefficients are obtained by dual-level direct dynamics approach with the interpolated SPE method at BB1K/MG3S//BB1K/6-31+G(d,p) level. Aforementioned rate coefficients are calculated based on canonical variational transition state theory (CVT) with small-curvature tunneling (SCT) correction. The results show that for the title reaction, variational effect is small while the tunneling effects are significant at low temperature. In order to investigate the reliability of improved BB1K potential energy surface in predicting barrier height of the reaction, different quantum models built such as QCISD(T)/6-311++G(d,p)//MP2/6-31G(d,p) , QCISD(T)/aug-cc-pv-DZ//MP2/6-31G(d,p) , and MP4SDQ/aug-cc-pv-DZ//MP2/6-31G(d,p) are applied to calculate the rate coefficients of the reaction. The results show the rate coefficients calculated based on MP2 potential energy surface are underestimated as compared to the experimental value. Finally three models are applied to fit the calculated rate coefficients over the temperature range of 50–2000 K. It is shown that the new four-parameter model provided a better temperature dependence than the other expressions. It is expected that obtained theoretical results can be useful for modeling the kinetics nature of the reaction of HFC-227ea and Cl atom over temperature range where no experimental data is accessible.
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Affiliation(s)
- MASOUD ARABIEH
- Department of Chemistry, Faculty of Sciences, Shahid Beheshti University, G.C., Evin, 19839-63113, Tehran, Iran
| | - MANSOUR ZAHEDI
- Department of Chemistry, Faculty of Sciences, Shahid Beheshti University, G.C., Evin, 19839-63113, Tehran, Iran
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Brudnik K, Twarda M, Sarzyński D, Jodkowski JT. Theoretical study of the kinetics of reactions of the monohalogenated methanes with atomic chlorine. J Mol Model 2012; 19:1489-505. [PMID: 23239396 PMCID: PMC3604598 DOI: 10.1007/s00894-012-1709-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2012] [Accepted: 11/22/2012] [Indexed: 11/23/2022]
Abstract
Ab initio calculations at the G2 level were used in a theoretical description of the kinetics and mechanism of the hydrogen abstraction reactions from fluoro-, chloro- and bromomethane by chlorine atoms. The profiles of the potential energy surfaces show that mechanism of the reactions under investigation is complex and consists of two - in the case of CH3F+Cl - and of three elementary steps for CH3Cl+Cl and CH3Br+Cl. The heights of the energy barrier related to the H-abstraction are of 8–10 kJ mol−1, the lowest value corresponds to CH3Cl+Cl and the highest one to CH3F+Cl. The rate constants were calculated using the theoretical method based on the RRKM theory and the simplified version of the statistical adiabatic channel model. The kinetic equations derived in this study\documentclass[12pt]{minimal}
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\begin{document}$$ \begin{array}{*{20}c} {k\left( {\mathrm{C}{{\mathrm{H}}_3}\mathrm{F}+\mathrm{Cl}} \right)=6.75\times 1{0^{-12 }}\times {{{\left( {\mathrm{T}/300} \right)}}^{2.12 }}\times\exp (-900/\mathrm{T})}{\mathrm{c}{{\mathrm{m}}^3}\mathrm{molecul}{{\mathrm{e}}^{-1 }}{{\mathrm{s}}^{-1 }}} \\ {k\left( {\mathrm{C}{{\mathrm{H}}_3}\mathrm{Cl}+\mathrm{Cl}} \right)=6.97\times 1{0^{-12 }}\times {{{\left( {\mathrm{T}/300} \right)}}^{1.73 }}\times\exp (-795/\mathrm{T})}{\mathrm{c}{{\mathrm{m}}^3}\mathrm{molecul}{{\mathrm{e}}^{-1 }}{{\mathrm{s}}^{-1 }}} \\ {k\left( {\mathrm{C}{{\mathrm{H}}_3}\mathrm{Br}+\mathrm{Cl}} \right)=6.26\times 1{0^{-12 }}\times {{{\left( {\mathrm{T}/300} \right)}}^{1.82 }}\times\exp (-795/\mathrm{T})}{\mathrm{c}{{\mathrm{m}}^3}\mathrm{molecul}{{\mathrm{e}}^{-1 }}{{\mathrm{s}}^{-1 }}} \\ \end{array} $$\end{document} and\documentclass[12pt]{minimal}
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\begin{document}$$ \begin{array}{*{20}c} {k\left( {\mathrm{C}{{\mathrm{H}}_2}\mathrm{F}+\mathrm{HCl}} \right)=2.88\times 1{0^{-13 }}\times {{{\left( {\mathrm{T}/300} \right)}}^{2.02 }}\times\exp (-1255/\mathrm{T})}{\mathrm{c}{{\mathrm{m}}^3}\mathrm{molecul}{{\mathrm{e}}^{-1 }}{{\mathrm{s}}^{-1 }}} \\ {k\left( {\mathrm{C}{{\mathrm{H}}_2}\mathrm{Cl}+\mathrm{HCl}} \right)=2.42\times 1{0^{-13 }}\times {{{\left( {\mathrm{T}/300} \right)}}^{1.57 }}\times\exp (-2100/\mathrm{T})}{\mathrm{c}{{\mathrm{m}}^3}\mathrm{molecul}{{\mathrm{e}}^{-1 }}{{\mathrm{s}}^{-1 }}} \\ {k\left( {\mathrm{C}{{\mathrm{H}}_2}\mathrm{Br}+\mathrm{HCl}} \right)=2.21\times 1{0^{-13 }}\times {{{\left( {\mathrm{T}/300} \right)}}^{1.69 }}\times\exp (-1485/\mathrm{T})}{\mathrm{c}{{\mathrm{m}}^3}\mathrm{molecul}{{\mathrm{e}}^{-1 }}{{\mathrm{s}}^{-1 }}} \\ \end{array} $$\end{document} allow a description of the kinetics of the reactions under investigation in the temperature range of 200–3000 K. The kinetics of reactions of the entirely deuterated reactants were also included in the kinetic analysis. Results of ab initio calculations show that D-abstraction process is related with the energy barrier of 5 kJ mol−1 higher than the H-abstraction from the corresponding non-deuterated reactant molecule. The derived analytical equations for the reactions, CD3X+Cl, CH2X+HCl and CD2X+DCl (X = F, Cl and Br) are a substantial supplement of the kinetic data necessary for the description and modeling of the processes of importance in the atmospheric chemistry.
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Affiliation(s)
- Katarzyna Brudnik
- Department of Physical Chemistry, Wroclaw Medical University, pl. Nankiera 1, 50-140 Wroclaw, Poland
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Sarzyński D, Gola AA, Brudnik K, Jodkowski JT. Kinetic study of the reactions of chlorine atoms with fluoromethane and D-fluoromethane in the gas phase. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2011.12.072] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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7
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Sun W, Saeys M. Construction of an ab initio kinetic model for industrial ethane pyrolysis. AIChE J 2010. [DOI: 10.1002/aic.12446] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Jia X, Liu Y, Sun J, Sun H, Su Z, Pan X, Wang R. Theoretical Investigation of the Reactions of CF3CHFOCF3 with the OH Radical and Cl Atom. J Phys Chem A 2009; 114:417-24. [PMID: 19950919 DOI: 10.1021/jp908228h] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiujuan Jia
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China, and Faculty of Physics, Aviation University of Air Force, 130022 Changchun, People’s Republic of China
| | - Youjun Liu
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China, and Faculty of Physics, Aviation University of Air Force, 130022 Changchun, People’s Republic of China
| | - Jingyu Sun
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China, and Faculty of Physics, Aviation University of Air Force, 130022 Changchun, People’s Republic of China
| | - Hao Sun
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China, and Faculty of Physics, Aviation University of Air Force, 130022 Changchun, People’s Republic of China
| | - Zhongmin Su
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China, and Faculty of Physics, Aviation University of Air Force, 130022 Changchun, People’s Republic of China
| | - Xiumei Pan
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China, and Faculty of Physics, Aviation University of Air Force, 130022 Changchun, People’s Republic of China
| | - Rongshun Wang
- Faculty of Chemistry, Institute of Functional Material Chemistry, Northeast Normal University, 130024 Changchun, People’s Republic of China, and Faculty of Physics, Aviation University of Air Force, 130022 Changchun, People’s Republic of China
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9
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Mechanistic and dual-level direct dynamics studies on the reaction Cl + CH2FCl. Theor Chem Acc 2009. [DOI: 10.1007/s00214-009-0587-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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10
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Marinkovic M, Gruber-Stadler M, Nicovich JM, Soller R, Mülhäuser M, Wine PH, Bache-Andreassen L, Nielsen CJ. Experimental and Theoretical Study of the Carbon-13 and Deuterium Kinetic Isotope Effects in the Cl and OH Reactions of CH3F. J Phys Chem A 2008; 112:12416-29. [PMID: 18989948 DOI: 10.1021/jp807609d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marina Marinkovic
- Centre for Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo, P.O. Box. 1033, Blindern 0315 Oslo, Norway, Studiengang Umwelt-, Verfahrens- & Biotechnik, MCI—Management Center Innsbruck Internationale Fachhochschulgesellschaft mbH, Egger-Lienz-Strasse 120, A-6020 Innsbruck, Austria, and School of Chemistry and Biochemistry and School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Margret Gruber-Stadler
- Centre for Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo, P.O. Box. 1033, Blindern 0315 Oslo, Norway, Studiengang Umwelt-, Verfahrens- & Biotechnik, MCI—Management Center Innsbruck Internationale Fachhochschulgesellschaft mbH, Egger-Lienz-Strasse 120, A-6020 Innsbruck, Austria, and School of Chemistry and Biochemistry and School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - J. Michael Nicovich
- Centre for Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo, P.O. Box. 1033, Blindern 0315 Oslo, Norway, Studiengang Umwelt-, Verfahrens- & Biotechnik, MCI—Management Center Innsbruck Internationale Fachhochschulgesellschaft mbH, Egger-Lienz-Strasse 120, A-6020 Innsbruck, Austria, and School of Chemistry and Biochemistry and School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Raenell Soller
- Centre for Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo, P.O. Box. 1033, Blindern 0315 Oslo, Norway, Studiengang Umwelt-, Verfahrens- & Biotechnik, MCI—Management Center Innsbruck Internationale Fachhochschulgesellschaft mbH, Egger-Lienz-Strasse 120, A-6020 Innsbruck, Austria, and School of Chemistry and Biochemistry and School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Max Mülhäuser
- Centre for Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo, P.O. Box. 1033, Blindern 0315 Oslo, Norway, Studiengang Umwelt-, Verfahrens- & Biotechnik, MCI—Management Center Innsbruck Internationale Fachhochschulgesellschaft mbH, Egger-Lienz-Strasse 120, A-6020 Innsbruck, Austria, and School of Chemistry and Biochemistry and School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Paul H. Wine
- Centre for Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo, P.O. Box. 1033, Blindern 0315 Oslo, Norway, Studiengang Umwelt-, Verfahrens- & Biotechnik, MCI—Management Center Innsbruck Internationale Fachhochschulgesellschaft mbH, Egger-Lienz-Strasse 120, A-6020 Innsbruck, Austria, and School of Chemistry and Biochemistry and School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Lihn Bache-Andreassen
- Centre for Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo, P.O. Box. 1033, Blindern 0315 Oslo, Norway, Studiengang Umwelt-, Verfahrens- & Biotechnik, MCI—Management Center Innsbruck Internationale Fachhochschulgesellschaft mbH, Egger-Lienz-Strasse 120, A-6020 Innsbruck, Austria, and School of Chemistry and Biochemistry and School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Claus J. Nielsen
- Centre for Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo, P.O. Box. 1033, Blindern 0315 Oslo, Norway, Studiengang Umwelt-, Verfahrens- & Biotechnik, MCI—Management Center Innsbruck Internationale Fachhochschulgesellschaft mbH, Egger-Lienz-Strasse 120, A-6020 Innsbruck, Austria, and School of Chemistry and Biochemistry and School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332
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11
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Zhang X, Li QS. Direct Dynamics Study on the Reaction of N2H4 with F Atom: A Hydrogen Abstraction Reaction? J Phys Chem A 2006; 110:11636-44. [PMID: 17034157 DOI: 10.1021/jp063540c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present a systematic direct ab initio dynamics investigation of the reaction between N2H4 and F atom, which is predicted to have three possible reaction channels. The structures and frequencies at the stationary points and the points along the minimum energy paths (MEPs) of all reaction channels were calculated at the UB3LYP/6-31+G(d,p) level of theory. Energetic information of stationary points and the points along the MEPs was further refined by means of the CCSD(T)/aug-cc-pVTZ method. The calculated results revealed that the first two primary channels (N2H4+F-->N2H3+HF) are equivalent and occur synchronously via the formation of a pre-reaction complex with Cs symmetry rather than via the direct H abstraction. The pre-reaction complex then evolves into a hydrogen-bonding intermediate through a transition state with nearly no barrier and a high exothermicity, which finally makes the intermediate further decompose into N2H3 and HF. Another reaction channel of minor role (N2H4+F-->NH2F+NH2) was also found during the calculations, which has the same Cs pre-reaction complex but forms NH2F and NH2 via another transition state with high-energy barrier and low exothermicity. The rate constants of these channels were calculated using the improved canonical variational transition state theory with the small-curvature tunneling correction (ICVT/SCT) method. The three-parameter ICVT/SCT rate constant expressions of k(ICVT/SCT) at the CCSD(T)/aug-cc-pVTZ//UB3LYP/6-31+G(d,p) level of theory within 220-3000 K were fitted as (7.64x10(-9))T (-0.87) exp(1180/T) cm3 mole-1 s-1 for N2H4+F-->N2H3+HF and 1.45x10(-12)(T/298)(2.17) exp(-1710/T) cm3 mole-1 s-1 for N2H4+F-->NH2F+NH2.
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Affiliation(s)
- Xin Zhang
- School of Chemistry and Environment, South China Normal University, Guangzhou 510631, People's Republic of China
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12
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Li QS, Yang J, Zhang S. Reaction-Path Dynamics and Theoretical Rate Constants for the CHnF4-n + O3 → HOOO + CHn-1F4-n (n = 2,3) Reactions. J Phys Chem A 2006; 110:11113-9. [PMID: 16986845 DOI: 10.1021/jp0626317] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present a theoretical study of the hydrogen abstraction reactions from CH(3)F and CH(2)F(2) by an ozone molecule. The geometries and harmonic vibrational frequencies of all stationary points are calculated at the MPW1K, BHandHLYP, and MPWB1K levels of theory. The energies of all of the stationary points were refined by using both higher-level (denoted as HL) energy calculations and QCISD(T)/6-311++G(2df,2pd) calculations based on the optimized geometries at the MPW1K/6-31+G(d,p) level of theory. The minimum energy paths (MEPs) were obtained by the MPW1K/6-31+G(d,p) level of theory. Energetic information of the points along the MEPs is further refined by the HL method. The rate constants were evaluated on the basis of the MEPs from the HL level of theory in the temperature range 200-2500 K by using the conventional transition-state theory (TST), the canonical variational transition-state theory (CVT), the microcanonical variational transition-state theory (microVT), the CVT coupled with the small-curvature tunneling (SCT) correction (CVT/SCT), and the microVT coupled with the Eckart tunneling correction (microVT/Eckart) based on the ab initio calculations. A general agreement was found among the TST, CVT, and microVT theories. The fitted three-parameter Arrhenius expressions of the calculated forward CVT/SCT and microVT/Eckart rate constants of the ozonolysis of fluoromethane are k(CVT/SCT)(T) = 2.76 x 10(-34)T(5.81)e((-13975/)(T)) and k(microVT/Eckart)(T) = 1.15 x 10(-34)T(5.97)e((-14530.7/)(T)), respectively. The fitted three-parameter Arrhenius expressions of the calculated forward CVT/SCT and microVT/Eckart rate constants of the ozonolysis of difluoromethane are k(CVT/SCT)(T) = 2.29 x 10(-36)T(6.42)e((-15451.6/)(T)) and k(microVT/Eckart)(T) = 1.31 x 10(-36)T(6.45)e((-15465.8/)(T)), respectively.
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Affiliation(s)
- Qian Shu Li
- School of Chemistry and Environment, South China Normal University, Guangzhou 510006, People's Republic of China.
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13
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Wang W, Feng L, Wang W, Luo Q, Li Q. Direct dynamics study on the hydrogen abstraction reaction of CH3CH2F with O(3P). ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.theochem.2006.02.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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14
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Galano A, Cruz-Torres A, Alvarez-Idaboy JR. Isopropylcyclopropane + OH Gas Phase Reaction: A Quantum Chemistry + CVT/SCT Approach. J Phys Chem A 2006; 110:1917-24. [PMID: 16451025 DOI: 10.1021/jp056117x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A theoretical study of the mechanism and kinetics of the OH hydrogen abstraction from isopropylcyclopropane (IPCP) is presented. Optimum geometries, frequencies and gradients have been computed at the BHandHLYP/6-311++G(d,p) level of theory for all stationary points, as well as for additional points along the minimum energy path (MEP). Energies have been improved by single-point calculations at the above geometries using CCSD(T)/6-311++G(d,p) to produce the potential energy surface. The rate coefficients are calculated for the temperature range 260-350 K by using canonical variational theory (CVT) with small-curvature tunneling (SCT) corrections. Our analysis suggests a stepwise mechanism involving the formation of a reactant complex in the entrance channel and a product complex in the exit channel, for all the modeled paths. The reactant complexes are examined in detail, because they exhibit alkene-like structure. The excellent agreement between the overall calculated and experimental rate coefficients at 298 K supports the reliability of the parameters obtained for the temperature dependence and branching ratios of the IPCP + OH reaction, proposed here for the fist time. The expression that best describes the studied reaction is k(overall) = 6.15 x 10(-13)e1747/RT cm3 x molecule(-1) x s(-1). The predicted activation energy is -0.89 kcal/mol.
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Affiliation(s)
- Annia Galano
- Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, 07730 México D. F., México.
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Galano A, Alvarez-Idaboy JR, Ruiz-Santoyo ME, Vivier-Bunge A. Glycolaldehyde + OH Gas Phase Reaction: A Quantum Chemistry + CVT/SCT Approach. J Phys Chem A 2004; 109:169-80. [PMID: 16839103 DOI: 10.1021/jp047490s] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
We present a theoretical study of the mechanism and kinetics of the OH hydrogen abstraction from glycolaldehyde. Optimum geometries, frequencies, and gradients have been computed at the BHandHLYP/6-311++G(d,p) level of theory for all stationary points, as well as for additional points along the minimum energy path (MEP). Energies are obtained by single-point calculations at the above geometries using CCSD(T)/6-311++G(d,p) to produce the potential energy surface. The rate coefficients are calculated for the temperature range 200-500 K by using canonical variational theory (CVT) with small-curvature tunneling (SCT) corrections. Our analysis suggests a stepwise mechanism involving the formation of a reactant complex in the entrance channel and a product complex in the exit channel, for all the modeled paths. The overall agreement between the calculated and experimental kinetic data that are available at 298 K is very good. This agreement supports the reliability of the parameters obtained for the temperature dependence of the glycolaldehyde + OH reaction. The expressions that best describe the studied reaction are k(overall) = 7.76 x 10(-13) e(1328/)(RT) cm(3).molecule(-1).s(-1) and k(overall) = 1.09 x 10(-21)T(3.03) e(3187/)(RT) cm(3) molecule(-1) s(-1), for the Arrhenius and Kooij approaches, respectively. The predicted activation energy is (-1.36 +/- 0.03) kcal/mol, at about 298 K. The agreement between the calculated and experimental branching ratios is better than 10%. The intramolecular hydrogen bond in OO-s-cis glycolaldehyde is found to be responsible for the discrepancies between SAR and experimental rate coefficients.
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Affiliation(s)
- Annia Galano
- Instituto Mexicano del Petróleo, Eje Central Lazaro Cardenas 152, 007730 México D. F., México.
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16
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Cho HG, Andrews L. Persistent Photo-Reversible Transition-Metal Methylidene System Generated from Reaction of Methyl Fluoride with Laser-Ablated Zirconium Atoms and Isolated in a Solid Argon Matrix. J Am Chem Soc 2004; 126:10485-92. [PMID: 15315465 DOI: 10.1021/ja0486115] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A photoreversible transition-metal methylidene system has been formed for the first time by reaction of methyl fluoride and laser-ablated Zr atoms, isolated in solid argon, and investigated by means of infrared spectroscopy. Four different groups of absorptions are characterized on the basis of behaviors upon broad-band irradiation and sample annealing. Growth of Group I is accompanied by demise of Group II on irradiation with visible light (lambda > 530 nm) and vice versa with UV light (240 < lambda < 380 nm). The methylidene complex CH(2)=ZrHF is responsible for Groups I and II either in different singlet-triplet spin states or argon matrix packing configurations. The ground singlet state is stabilized by an agostic interaction. On the other hand, Group III, which arises from the Grignard type compound CH(3)-ZrF, disappears upon irradiation of UV light (lambda > 380 nm), increasing the concentration of CH(2)=ZrHF by alpha-H elimination. Fragments of methyl fluoride such as the CH(2)F radical comprise Group IV. Theoretical calculations are carried out for the alkylidene complex and other plausible products, and the results are compared with the experimental frequencies.
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Affiliation(s)
- Han-Gook Cho
- Contribution from the Department of Chemistry, P.O. Box 400319, University of Virginia, Charlottesville, VA 22904-4319, USA
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17
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Cho HG, Andrews L. Photoreversible Hydrogen Migration System in a Solid Argon Matrix Formed by the Reaction of Methyl Fluoride with Laser-Ablated Titanium Atoms. J Phys Chem A 2004. [DOI: 10.1021/jp0483775] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Han-Gook Cho
- Department of Chemistry, University of Virginia, P.O. Box 400319, Charlottesville, Virginia 22904-4319
| | - Lester Andrews
- Department of Chemistry, University of Virginia, P.O. Box 400319, Charlottesville, Virginia 22904-4319
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18
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Murray C, Orr-Ewing * AJ. The dynamics of chlorine-atom reactions with polyatomic organic molecules. INT REV PHYS CHEM 2004. [DOI: 10.1080/01442350412331329166] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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19
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20
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Li QS, Lü RH, Wang CY. Accurate ab initio calculations on the rate constants of the hydrogen abstraction reaction C2H3+H2→H+C2H4. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.theochem.2003.10.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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21
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Li QS, Zhang X, Zhang SW. Direct Dynamics Study on the Hydrogen Abstraction Reaction N2H4 + H → N2H3 + H2. J Phys Chem A 2003. [DOI: 10.1021/jp034592u] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Qian Shu Li
- School of Science, Beijing Institute of Technology, Beijing 100081, People's Republic of China
| | - Xin Zhang
- School of Science, Beijing Institute of Technology, Beijing 100081, People's Republic of China
| | - Shao Wen Zhang
- School of Science, Beijing Institute of Technology, Beijing 100081, People's Republic of China
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22
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Sheng L, Li ZS, Liu JY, Xiao JF, Sun CC. Ab initio direct dynamics studies on the reactions of H atoms with CH3Cl and CH3Br. J Chem Phys 2003. [DOI: 10.1063/1.1545676] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
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23
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Liu JY, Li ZS, Dai ZW, Huang XR, Sun CC. Direct dynamics study of hydrogen abstraction using density functional theory: reaction. Chem Phys 2003. [DOI: 10.1016/s0301-0104(02)00920-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Xiao JF, Li ZS, Liu JY, Sheng L, Sun CC. DFT and ab initio direct dynamics studies on the hydrogen abstraction reactions of chlorine atoms with CH(4-n)F(n) (n = 1-3). J Comput Chem 2002; 23:1456-65. [PMID: 12370947 DOI: 10.1002/jcc.10165] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A direct dynamics study is carried out for the hydrogen abstraction reactions Cl + CH(4-n)F(n) (n = 1-3) in the temperature range of 200-1,000 K. The minimum energy paths (MEPs) of these reactions are calculated at the BH&H-LYP/6-311G(d,p) level, and the energies along the MEPs are further refined at the QCISD(T)/6-311+G(2df,2p) and QCISD(T)/6-311+G(d,p) (single-point) level. The rate constants obtained by using the improved canonical variational transition state theory incorporating small-curvature tunneling correction (ICVT/SCT) are in good agreement with the available experimental results. It is shown that the vibrational adiabatic potential energy curves for these reactions have two barriers, a situation similar to the analogous reactions CH(3)X+Cl (X=Cl, Br). The theoretical results show that for the title reactions the variational effect should not be neglected over the whole considered temperature range, while the small-curvature tunneling effect is only important in the lower temperature range. The effects of fluorine substitution on the rate of this kind of reactions are also examined.
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Affiliation(s)
- Jing-Fa Xiao
- Institute of Theoretical Chemistry, State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130023, People's Republic of China
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25
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Li QS, Wang CY. A Theoretical Study on the Two Reactions of Acetonitrile with Atomic Chlorine and Bromine. J Phys Chem A 2002. [DOI: 10.1021/jp0144707] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Qian Shu Li
- School of Chemical Engineering & Materials Science, Beijing Institute of Technology, Beijing 100081, P. R. China, and Institute of Theoretical Chemistry, State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130023, P. R. China
| | - Chao Yang Wang
- School of Chemical Engineering & Materials Science, Beijing Institute of Technology, Beijing 100081, P. R. China, and Institute of Theoretical Chemistry, State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130023, P. R. China
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Fokin AA, Schreiner PR. Selective alkane transformations via radicals and radical cations: insights into the activation step from experiment and theory. Chem Rev 2002; 102:1551-94. [PMID: 11996544 DOI: 10.1021/cr000453m] [Citation(s) in RCA: 306] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrey A Fokin
- Department of Organic Chemistry, Kiev Polytechnic Institute, 37 Pobedy Avenue, 03056 Kiev, Ukraine.
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27
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Li QS, Wang CY. DFT study of the rate constants of the reactions CHClmF3−m + Cl = CClmF3−m + HCl (m = 3 − 1). Phys Chem Chem Phys 2002. [DOI: 10.1039/b206133n] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Xiao JF, Li ZS, Ding YH, Liu JY, Huang XR, Sun CC. Density Functional Theory and ab Initio Direct Dynamics Studies on the Hydrogen Abstraction Reactions of Chlorine Atoms with CHCl3-nFn (n = 0, 1, and 2) and CH2Cl2. J Phys Chem A 2001. [DOI: 10.1021/jp013405u] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Jing-Fa Xiao
- Institute of Theoretical Chemistry, State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130023, P. R. China
| | - Ze-Sheng Li
- Institute of Theoretical Chemistry, State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130023, P. R. China
| | - Yi-Hong Ding
- Institute of Theoretical Chemistry, State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130023, P. R. China
| | - Jing-Yao Liu
- Institute of Theoretical Chemistry, State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130023, P. R. China
| | - Xu-Ri Huang
- Institute of Theoretical Chemistry, State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130023, P. R. China
| | - Chia-Chung Sun
- Institute of Theoretical Chemistry, State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130023, P. R. China
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29
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Okamoto Y. Initial Stage of the Catalyzed Growth of SiO2 Films on Si(001): An ab Initio Study. J Phys Chem B 1999. [DOI: 10.1021/jp991353r] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yasuharu Okamoto
- Fundamental Research Laboratories, NEC Corporation, Tsukuba, Ibaraki 305-8501, Japan
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Loerting T, Liedl KR. Temperature-Dependent Ways of Proton TransferA Benchmark Study on Cyclic HF Oligomers. J Phys Chem A 1999. [DOI: 10.1021/jp9914774] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Thomas Loerting
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Klaus R. Liedl
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
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31
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Zavitsas AA. Energy Barriers to Chemical Reactions. Why, How, and How Much? Non-Arrhenius Behavior in Hydrogen Abstractions by Radicals. J Am Chem Soc 1998. [DOI: 10.1021/ja973698y] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andreas A. Zavitsas
- Contribution from the Department of Chemistry, Long Island University, Brooklyn, New York 11201
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