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Baptista L, de Almeida AA. Phosphine Reactivity and Its Implications for Pyrolysis Experiments and Astrochemistry. J Phys Chem A 2023; 127:1000-1012. [PMID: 36661302 DOI: 10.1021/acs.jpca.2c07782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Despite the importance of phosphorus-bearing molecules for life and their abundance outside Earth, the chemistry of those compounds still is poorly described. The present study investigates phosphine (PH3) decomposition and formation pathways. The reactions studied include phosphine thermal dissociation, conversion into PO(2Π), PN(1Σ+), and reactions in the presence of H2O+. The thermodynamic and rate coefficients of all reactions are calculated in the range of 50-2000 K considering the CCSD(T)/6-311G(3df,3pd)//ωB97xD/6-311G(3df,3pd) electronic structure data. The rate coefficients were calculated by RRKM and semiclassical transition-state theory (SCTST). According to our results, PH3 is stable to thermal decomposition at T < 100 K and can be formed promptly by a reaction network involving PH(3Σ-), PO(2Π), and PN(1Σ+). In the presence of radiation or ions, PH3 is readily decomposed. For this reason, it should be mainly associated with dust grains or icy mantles to be observed under the physical conditions prevailing in the interstellar medium (ISM). The intersystem crossing associated with the dissociation of the isomers PON, NPO, and PNO is accessed by multireference methods, and its importance for the gas-phase PH3 formation/destruction is discussed. Also, the implications of the present outcomes on phosphorus astrochemistry are highlighted.
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Affiliation(s)
- Leonardo Baptista
- Departamento de Química e Ambiental, Campus Regional de Resende, Universidade do Estado do Rio de Janeiro, Faculdade de Tecnologia, Rodovia Presidente Dutra km 298, Rio de Janeiro, RJCEP 27537-000, Brazil
| | - Amaury A de Almeida
- Departamento de Astronomia, Cidade Universitária, Universidade de São Paulo, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Rua do Matão 1226, São Paulo, SPCEP 05508-090, Brazil
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Zhang Y, Cheng Y, Zhang T, Wang R, Ji J, Xia Y, Makroni L, Wang Z, M B. A computational study of the HO2 + SO3 → HOSO2 + 3O2 reaction catalyzed by water monomer, water dimer and small clusters of sulfuric acid: kinetics and atmospheric implications. Phys Chem Chem Phys 2022; 24:18205-18216. [DOI: 10.1039/d1cp03318b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, the reaction mechanisms and kinetics for the HO2 + SO3 → HOSO2 + 3O2 reaction catalyzed by water monomer, water dimer and small clusters of sulfuric acid have been...
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Bänsch C, Olzmann M. Reaction of dimethoxymethane with hydroxyl radicals: An experimental kinetic study at temperatures above 296 K and pressures of 2, 5, and 10 bar. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.01.053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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dos Santos LP, Baptista L. The effect of carbon-chain oxygenation in the carbon-carbon dissociation. J Mol Model 2018; 24:147. [DOI: 10.1007/s00894-018-3693-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 05/23/2018] [Indexed: 12/01/2022]
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Koksharov A, Yu C, Bykov V, Maas U, Pfeifle M, Olzmann M. Quasi-Spectral Method for the Solution of the Master Equation for Unimolecular Reaction Systems. INT J CHEM KINET 2018. [DOI: 10.1002/kin.21165] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Andrey Koksharov
- Institut für Technische Thermodynamik; Karlsruher Institut für Technologie (KIT); 76131 Karlsruhe Germany
| | - Chunkan Yu
- Institut für Technische Thermodynamik; Karlsruher Institut für Technologie (KIT); 76131 Karlsruhe Germany
| | - Viatcheslav Bykov
- Institut für Technische Thermodynamik; Karlsruher Institut für Technologie (KIT); 76131 Karlsruhe Germany
| | - Ulrich Maas
- Institut für Technische Thermodynamik; Karlsruher Institut für Technologie (KIT); 76131 Karlsruhe Germany
| | - Mark Pfeifle
- Institut für Physikalische Chemie; Karlsruher Institut für Technologie (KIT); 76131 Karlsruhe Germany
| | - Matthias Olzmann
- Institut für Physikalische Chemie; Karlsruher Institut für Technologie (KIT); 76131 Karlsruhe Germany
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6
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Mai TVT, Duong MV, Nguyen HT, Huynh LK. Ab initio kinetics of the HOSO 2 + 3O 2 → SO 3 + HO 2 reaction. Phys Chem Chem Phys 2018; 20:6677-6687. [PMID: 29457181 DOI: 10.1039/c7cp07704a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The detailed kinetic mechanism of the HOSO2 + 3O2 reaction, which plays a pivotal role in the atmospheric oxidation of SO2, was investigated using accurate electronic structure calculations and novel statistical thermodynamic/kinetic models. Explored using the accurate composite method W1U, the detailed potential energy surface (PES) revealed that the addition of O2 to a HOSO2 radical to form the adduct (HOSO4) proceeds via a transition state with a slightly positive barrier (i.e., 0.7 kcal mol-1 at 0 K). Such a finding compromises a long-term hypothesis about this channel of being a barrierless process. Moreover, the overall reaction was found to be slightly exothermic by 1.7 kcal mol-1 at 0 K, which is in good agreement with recent studies. On the newly-constructed PES, the temperature- and pressure-dependent behaviors of the title reaction were characterized in a wide range of conditions (T = 200-1000 K & P = 10-760 Torr) using the integrated deterministic and stochastic master equation/Rice-Ramsperger-Kassel-Marcus (ME/RRKM) rate model in which corrections for hindered internal rotation (HIR) and tunneling treatments were included. The calculated numbers were found to be in excellent agreement with literature data. The sensitivity analyses on the derived rate coefficients with respect to the ab initio input parameters (i.e., barrier height and energy transfer) were also performed to further understand the kinetic behaviors of the title reaction. The detailed kinetic mechanism, consisting of thermodynamic and kinetic data (in NASA polynomial and modified Arrhenius formats, respectively), was also provided at different T & P for further use in the modeling/simulation of any related systems.
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Affiliation(s)
- Tam V-T Mai
- Molecular Science and Nano-Materials Lab, Institute for Computational Science and Technology, SBI Building, Quang Trung Software City, Tan Chanh Hiep Ward, District 12, Ho Chi Minh City, Vietnam
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Barker JR, Frenklach M, Golden DM. Reply to “Comment on ‘When Rate Constants Are Not Enough’”. J Phys Chem A 2016; 120:313-7. [DOI: 10.1021/acs.jpca.5b06652] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John R. Barker
- Department
of Climate and Space Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2143, United States
| | - Michael Frenklach
- Department
of Mechanical Engineering, University of California, Berkeley, California 94720-1740, United States
| | - David M. Golden
- Department
of Mechanical Engineering, Stanford University, Stanford, California 94305-3032, United States
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Baptista L, da Silveira EF. A theoretical study of three gas-phase reactions involving the production or loss of methane cations. Phys Chem Chem Phys 2014; 16:21867-75. [PMID: 25200833 DOI: 10.1039/c4cp02607a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrocarbon ions are important species in flames, spectroscopy and the interstellar medium. Their importance is reflected in the extensive body of literature on the structure and reactivity of carbocations. However, the geometry, electronic structure and reactivity of carbocations are difficult to assess. This study aims to contribute to the current knowledge of this subject by presenting a quantum mechanics description of methane cation dissociation using multiconfigurational methods. The geometric and electronic parameters of the minimum structure were determined for three main reaction paths: the dissociation CH4(+)→ CH2(+) + H2 and the dissociation-recombination processes CH4(+)↔ CH3(+) + H. The electronic and energetic effects of these reactions were analyzed, and it was found that each reaction path has a strong dependence on the methodology used as well as a strong multiconfigurational character during dissociation. The first doublet excited states are inner-shell excited states and may correspond to the ions that are expected to be formed after electron detachment. The rate coefficient for each reaction path was determined using variational transition state theory and RRKM/master equation calculations. The major dissociation paths, with their rate coefficients at the high-pressure limit, are CH4(+)(X(~)(2)B1) → CH3(+)(A(2)A1') + H((2)S) (k∞(T) = 1.42 × 10(+14) s(-1) exp(-37.12/RT)) and CH4(+)(X(~)(2)B1) → CH2(+)(A(2)A1) + H2((2)Σg(+)) (k∞(T) = 9.18 × 10(+14) s(-1) exp(-55.77/RT)). Our findings help to explain the abundance of ions formed from CH4 in the interstellar medium and to build models of chemical evolution.
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Affiliation(s)
- Leonardo Baptista
- Universidade do Estado do Rio de Janeiro, Faculdade de Tecnologia, Departamento de Química e Ambiental, Rodovia Presidente Dutra Km 298, Resende, RJ, Brazil.
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Pfeifle M, Olzmann M. Consecutive Chemical Activation Steps in the OH-Initiated Atmospheric Degradation of Isoprene: An Analysis with Coupled Master Equations. INT J CHEM KINET 2014. [DOI: 10.1002/kin.20849] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Mark Pfeifle
- Institut für Physikalische Chemie; Karlsruher Institut für Technologie; 76131 Karlsruhe Germany
| | - Matthias Olzmann
- Institut für Physikalische Chemie; Karlsruher Institut für Technologie; 76131 Karlsruhe Germany
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Jain C, Schoemaecker C, Fittschen C. Yield of HO2 Radicals in the OH-Initiated Oxidation of SO2. ACTA ACUST UNITED AC 2011. [DOI: 10.1524/zpch.2011.0169] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
The HO2 radical yield in the OH initiated oxidation of SO2 has been determined by direct observation of HO2 concentration time profiles following the 248 nm photolysis of H2O2/SO2/O2 mixtures. Initial OH radical concentrations have been deduced from a fit of the absolute HO2 concentration time profiles after 248 nm photolysis of H2O2 in the absence of SO2, an increase in the HO2 concentration upon addition of SO2 to this reaction mixture is observed and can be explained by a decrease of HO
x
-radical losses due to a faster decay of OH radicals in the presence of SO2. Simulations of theses profiles using recommended rate constants in a simple model are in agreement with an HO2-yield of 1.0 ± 0.1 from the OH initiated oxidation of SO2.
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Affiliation(s)
- Chaithanya Jain
- Université Lille Nord de France, Physico-Chimie des Processus de Combustion, Villeneuve d'Ascq Cedex, Frankreich
| | - Coralie Schoemaecker
- Université Lille Nord de France, Physico-Chimie des Processus de Combustion, Villeneuve d'Ascq Cedex, Frankreich
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Giri BR, Roscoe JM, González-García N, Olzmann M, Lo JMH, Marriott RA. Experimental and theoretical investigation of the kinetics of the reaction of atomic chlorine with 1,4-dioxane. J Phys Chem A 2011; 115:5105-11. [PMID: 21526862 DOI: 10.1021/jp201803g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The rate coefficients for the reaction of 1,4-dioxane with atomic chlorine were measured from T = 292-360 K using the relative rate method. The reference reactant was isobutane and the experiments were made in argon with atomic chlorine produced by photolysis of small concentrations of Cl2. The rate coefficients were put on an absolute basis by using the published temperature dependence of the absolute rate coefficients for the reference reaction. The rate coefficients for the reaction of Cl with 1,4-dioxane were found to be independent of total pressure from p = 290 to 782 Torr. The experimentally measured rate coefficients showed a weak temperature dependence, given by k(exp)(T) = (8.4(-2.3)(+3.1)) × 10(-10) exp(-(470 ± 110)/(T/K)) cm3 molecule (-1) s(-1). The experimental results are rationalized in terms of statistical rate theory on the basis of molecular data obtained from quantum-chemical calculations. Molecular geometries and frequencies were obtained from MP2/aug-cc-pVDZ calculations, while single-point energies of the stationary points were computed at CCSD(T) level of theory. The calculations indicate that the reaction proceeds by an overall exothermic addition-elimination mechanism via two intermediates, where the rate-determining step is the initial barrier-less association reaction between the chlorine atom and the chair conformer of 1,4-dioxane. This is in contrast to the Br plus 1,4-dioxane reaction studied earlier, where the rate-determining step is a chair-to-boat conformational change of the bromine-dioxane adduct, which is necessary for this reaction to proceed. The remarkable difference in the kinetic behavior of the reactions of 1,4-dioxane with these two halogen atoms can be consistently explained by this change in the reaction mechanism.
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Affiliation(s)
- Binod R Giri
- Department of Chemistry, Acadia University, Wolfville, NS, Canada
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