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Ramalho SS, da Cunha WF, Albernaz AF, Neto PHO, e Silva GM, Gargano R. An extensive investigation of reactions involved in the nitrogen trifluoride dissociation. NEW J CHEM 2013. [DOI: 10.1039/c3nj00553d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Affiliation(s)
- Vincent Brites
- a Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle , MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée , France
| | - Céline Léonard
- a Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle , MSME UMR 8208 CNRS, 5 bd Descartes, 77454 Marne-la-Vallée , France
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Ramalho SS, da Cunha WF, Barreto PRP, Neto PHO, Roncaratti LF, e Silva GM, Gargano R. Thermal Rate Constant Calculation of the NF + F Reactive System Multiple Arrangements. J Phys Chem A 2011; 115:8248-54. [DOI: 10.1021/jp204229d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Simone S. Ramalho
- Instituto Federal de Educação, Ciência e Tecnologia de Goiás Av. Universitária, Vale das Goiabeiras, Inhumas, GO, CEP 75400-000, Brazil
| | - Wiliam F. da Cunha
- Instituto de Física, Universidade de Brasília, CP04455, Brasília, DF, CEP 70919-970, Brazil
| | - Patrícia R. P. Barreto
- LAP, Instituto Nacional de Pesquisas Espaciais, CP515, São José dos Campos, SP, CEP 12247-970, Brazil
| | - Pedro H. O. Neto
- Instituto de Física, Universidade de Brasília, CP04455, Brasília, DF, CEP 70919-970, Brazil
| | - Luiz F. Roncaratti
- Instituto de Física, Universidade de Brasília, CP04455, Brasília, DF, CEP 70919-970, Brazil
| | - Geraldo Magela e Silva
- Instituto de Física, Universidade de Brasília, CP04455, Brasília, DF, CEP 70919-970, Brazil
| | - Ricardo Gargano
- Instituto de Física, Universidade de Brasília, CP04455, Brasília, DF, CEP 70919-970, Brazil
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Ramalho SS, Barreto PRP, Martins JBL, Magela e Silva G, Gargano R. A Computational Investigation of the Multiple Channels of the NF2 + F Reaction. J Phys Chem A 2009; 113:14336-42. [DOI: 10.1021/jp903221b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Simone S. Ramalho
- Instituto Federal de Educação, Ciência e Tecnologia de Goiás, IFG, Av. Universitária, Vale das Goiabeiras, Inhumas, GO, CEP 75400-000, Brazil, Instituto de Física, Universidade de Brasília, CP04455, Brasília, DF, CEP 70919-970, Brazil, LAP, Instituto Nacional de Pesquisas Espaciais, CP515, São José dos Campos, SP, CEP 12247-970, Brazil, and Instituto de Química, Universidade de Brasília, CP4478, 70919-970 Brasília, DF, Brazil
| | - Patrícia R. P. Barreto
- Instituto Federal de Educação, Ciência e Tecnologia de Goiás, IFG, Av. Universitária, Vale das Goiabeiras, Inhumas, GO, CEP 75400-000, Brazil, Instituto de Física, Universidade de Brasília, CP04455, Brasília, DF, CEP 70919-970, Brazil, LAP, Instituto Nacional de Pesquisas Espaciais, CP515, São José dos Campos, SP, CEP 12247-970, Brazil, and Instituto de Química, Universidade de Brasília, CP4478, 70919-970 Brasília, DF, Brazil
| | - João B. L. Martins
- Instituto Federal de Educação, Ciência e Tecnologia de Goiás, IFG, Av. Universitária, Vale das Goiabeiras, Inhumas, GO, CEP 75400-000, Brazil, Instituto de Física, Universidade de Brasília, CP04455, Brasília, DF, CEP 70919-970, Brazil, LAP, Instituto Nacional de Pesquisas Espaciais, CP515, São José dos Campos, SP, CEP 12247-970, Brazil, and Instituto de Química, Universidade de Brasília, CP4478, 70919-970 Brasília, DF, Brazil
| | - Geraldo Magela e Silva
- Instituto Federal de Educação, Ciência e Tecnologia de Goiás, IFG, Av. Universitária, Vale das Goiabeiras, Inhumas, GO, CEP 75400-000, Brazil, Instituto de Física, Universidade de Brasília, CP04455, Brasília, DF, CEP 70919-970, Brazil, LAP, Instituto Nacional de Pesquisas Espaciais, CP515, São José dos Campos, SP, CEP 12247-970, Brazil, and Instituto de Química, Universidade de Brasília, CP4478, 70919-970 Brasília, DF, Brazil
| | - Ricardo Gargano
- Instituto Federal de Educação, Ciência e Tecnologia de Goiás, IFG, Av. Universitária, Vale das Goiabeiras, Inhumas, GO, CEP 75400-000, Brazil, Instituto de Física, Universidade de Brasília, CP04455, Brasília, DF, CEP 70919-970, Brazil, LAP, Instituto Nacional de Pesquisas Espaciais, CP515, São José dos Campos, SP, CEP 12247-970, Brazil, and Instituto de Química, Universidade de Brasília, CP4478, 70919-970 Brasília, DF, Brazil
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Mikhailov VA, Parkes MA, Simpson MJ, Tuckett RP, Mayhew CA. Selected ion flow tube study of the ion-molecule reactions of monochloroethene, trichloroethene, and tetrachloroethene. J Phys Chem A 2008; 112:9012-22. [PMID: 18754602 DOI: 10.1021/jp804443v] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Data for the rate coefficients and product cations of the reactions of a large number of atomic and small molecular cations with monochloroethene, trichloroethene, and tetrachloroethene in a selected ion flow tube at 298 K are reported. The recombination energy of the ions range from 6.27 (H3O(+)) through to 21.56 (Ne(+)) eV. Collisional rate coefficients are calculated by modified average dipole orientation theory and compared with experimental values. Thermochemistry and mass balance predict the most feasible neutral products. Together with previously reported results for the three isomers of dichloroethene ( Mikhailov, V. A. ; Parkes, M. A. ; Tuckett, R. P. ; Mayhew, C. A. J. Phys. Chem. A 2006, 110, 5760 ), the fragment ion branching ratios have been compared with those from threshold photoelectron photoion coincidence spectroscopy over the photon energy range of 9-22 eV to determine the importance or otherwise of long-range charge transfer. For ions with recombination energy in excess of the ionization energy of the chloroethene, charge transfer is energetically allowed. The similarity of the branching ratios from the two experiments suggest that long-range charge transfer is dominant. For ions with recombination energy less than the ionization energy, charge transfer is not allowed; chemical reaction can only occur following formation of an ion-molecule complex, where steric effects are more significant. The products that are now formed and their percentage yields are a complex interplay between the number and position of the chlorine atoms with respect to the C=C bond, where inductive and conjugation effects can be important.
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Affiliation(s)
- Victor A Mikhailov
- School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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Affiliation(s)
- James L. Reed
- Department of Chemistry and Center for Functional Nanoscale Materials, Clark Atlanta University, 223 Brawley Dr. SW, Atlanta Georgia 30314
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Mikhailov VA, Parkes MA, Tuckett RP, Mayhew CA. Isomeric Effects in the Gas-Phase Reactions of Dichloroethene, C2H2Cl2, with a Series of Cations. J Phys Chem A 2006; 110:5760-71. [PMID: 16640370 DOI: 10.1021/jp060093s] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A study of the reactions of a series of gas-phase cations (NH(4)(+), H(3)O(+), SF(3)(+), CF(3)(+), CF(+), SF(5)(+), SF(2)(+), SF(+), CF(2)(+), SF(4)(+), O(2)(+), Xe(+), N(2)O(+), CO(2)(+), Kr(+), CO(+), N(+), N(2)(+), Ar(+), F(+), and Ne(+)) with the three structural isomers of dichloroethene, i.e., 1,1-C(2)H(2)Cl(2), cis-1,2-C(2)H(2)Cl(2), and trans-1,2-C(2)H(2)Cl(2) is reported. The recombination energy (RE) of these ions spans the range of 4.7-21.6 eV. Reaction rate coefficients and product branching ratios have been measured at 298 K in a selected ion flow tube (SIFT). Collisional rate coefficients are calculated by modified average dipole orientation (MADO) theory and compared with experimental data. Thermochemistry and mass balance have been used to predict the most feasible neutral products. Threshold photoelectron-photoion coincidence spectra have also been obtained for the three isomers of C(2)H(2)Cl(2) with photon energies in the range of 10-23 eV. The fragment ion branching ratios have been compared with those of the flow tube study to determine the importance of long-range charge transfer. A strong influence of the isomeric structure of dichloroethene on the products of ion-molecule reactions has been observed for H(3)O(+), CF(3)(+), and CF(+). For 1,1-C(2)H(2)Cl(2) the reaction with H(3)O(+) proceeds at the collisional rate with the only ionic product being 1,1-C(2)H(2)Cl(2)H(+). However, the same reaction yields two more ionic products in the case of cis-1,2- and trans-1,2-C(2)H(2)Cl(2), but only proceeds with 14% and 18% efficiency, respectively. The CF(3)(+) reaction proceeds with 56-80% efficiency, the only ionic product for 1,1-C(2)H(2)Cl(2) being C(2)H(2)Cl(+) formed via Cl(-) abstraction, whereas the only ionic product for both 1,2-isomers is CHCl(2)(+) corresponding to a breaking of the C=C double bond. Less profound isomeric effects, but still resulting in different products for 1,1- and 1,2-C(2)H(2)Cl(2) isomers, have been found in the reactions of SF(+), CO(2)(+), CO(+), N(2)(+), and Ar(+). Although these five ions have REs above the ionization energy (IE) of any of the C(2)H(2)Cl(2) isomers, and hence the threshold for long-range charge transfer, the results suggest that the formation of a collision complex at short range between these ions and C(2)H(2)Cl(2) is responsible for the observed effects.
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Affiliation(s)
- Victor A Mikhailov
- School of Physics and Astronomy, and School of Chemistry, University of Birmingham, Edgbaston, UK
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Howle CR, Mayhew CA, Tuckett RP. Selected Ion Flow Tube Study of the Reactions between Gas Phase Cations and CHCl2F, CHClF2, and CH2ClF. J Phys Chem A 2005; 109:3626-36. [PMID: 16839028 DOI: 10.1021/jp040582x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The branching ratios and rate coefficients have been measured at 298 K for the reactions between CHCl2F, CHClF2, and CH2ClF and the following cations (with recombination energies in the range 6.3-21.6 eV); H3O+, SFx+ (x = 1-5), CFy+ (y = 1-3), NO+, NO2+, O2+, Xe+, N2O+, O+, CO2+, Kr+, CO+, N+, N2+, Ar+, F+, and Ne+. The majority of the reactions proceed at the calculated collisional rate, but the reagent ions SF3+, NO+, NO2+, and SF2+ do not react. Surprisingly, although all of the observed product channels are calculated to be endothermic, H3O+ does react with CHCl2F. On thermochemical grounds, Xe+ appears to react with these molecules only when it is in its higher-energy 2P1/2 spin-orbit state. In general, most of the reactions form products by dissociative charge transfer, but some of the reactions of CH2ClF with the lower-energy cations produce the parent cation in significant abundance. The branching ratios produced in this study and by threshold photoelectron-photoion coincidence spectroscopy agree reasonably well over the energy range 11-22 eV. In about one-fifth of the large number of reactions studied, the branching ratios are in excellent agreement and appreciable energy resonance between an excited state and the ground state of the ionized neutral exists, suggesting that these reactions proceed exclusively by a long-range charge-transfer mechanism. Upper limits for the enthalpy of formation at 298 K of SF4Cl (-637 kJ mol-1), SClF (-28 kJ mol-1), and SHF (-7 kJ mol-1) are determined.
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Affiliation(s)
- Chris R Howle
- School of Chemistry and School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
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Setser DW, Muravyov AA, Rengarajan R. Recombination versus Disproportionation Reactions of Hydrogen Atoms with ClCF2CHF, ClC2F4, BrC2H4, BrC2F4, and BrCF2CFBr Radicals and Unimolecular Reactions of the Haloethane Molecules from Recombination. J Phys Chem A 2004. [DOI: 10.1021/jp031144d] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- D. W. Setser
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
| | - A. A. Muravyov
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
| | - R. Rengarajan
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506
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Rajakumar B, Arunan E. Ab initio, DFT and transition state theory calculations on 1,2-HF, HCI and CIF elimination reactions from CH2F–CH2Cl. Phys Chem Chem Phys 2003. [DOI: 10.1039/b306833a] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Rajakumar B, Reddy KPJ, Arunan E. Unimolecular HCl Elimination from 1,2-Dichloroethane: A Single Pulse Shock Tube and ab Initio Study. J Phys Chem A 2002. [DOI: 10.1021/jp020008q] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- B. Rajakumar
- Department of Inorganic and Physical Chemistry and Department of Aerospace Engineering, Indian Institute of Science, Bangalore, India 560012
| | - K. P. J. Reddy
- Department of Inorganic and Physical Chemistry and Department of Aerospace Engineering, Indian Institute of Science, Bangalore, India 560012
| | - E. Arunan
- Department of Inorganic and Physical Chemistry and Department of Aerospace Engineering, Indian Institute of Science, Bangalore, India 560012
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