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Marcellini M, Nasedkin A, Zietz B, Petersson J, Vincent J, Palazzetti F, Malmerberg E, Kong Q, Wulff M, van der Spoel D, Neutze R, Davidsson J. Transient isomers in the photodissociation of bromoiodomethane. J Chem Phys 2018; 148:134307. [PMID: 29626862 DOI: 10.1063/1.5005595] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The photochemistry of halomethanes is fascinating for the complex cascade reactions toward either the parent or newly synthesized molecules. Here, we address the structural rearrangement of photodissociated CH2IBr in methanol and cyclohexane, probed by time-resolved X-ray scattering in liquid solution. Upon selective laser cleavage of the C-I bond, we follow the reaction cascade of the two geminate geometrical isomers, CH2I-Br and CH2Br-I. Both meta-stable isomers decay on different time scales, mediated by solvent interaction, toward the original parent molecule. We observe the internal rearrangement of CH2Br-I to CH2I-Br in cyclohexane by extending the time window up to 3 μs. We track the photoproduct kinetics of CH2Br-I in methanol solution where only one isomer is observed. The effect of the polarity of solvent on the geminate recombination pathways is discussed.
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Affiliation(s)
- Moreno Marcellini
- Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 462, SE-751 20 Uppsala, Sweden
| | - Alexandr Nasedkin
- Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 462, SE-751 20 Uppsala, Sweden
| | - Burkhard Zietz
- Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 462, SE-751 20 Uppsala, Sweden
| | - Jonas Petersson
- Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 462, SE-751 20 Uppsala, Sweden
| | - Jonathan Vincent
- Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 462, SE-751 20 Uppsala, Sweden
| | - Federico Palazzetti
- Universitá di Perugia, Dipartimento di Chimica, Biologia e Biotecnologie, 06123 Perugia, Italy
| | - Erik Malmerberg
- Department of Chemistry and Molecular Biology, University of Gothenburg, SE-405 30 Gothenburg, Sweden
| | - Qingyu Kong
- Argonne National Laboratory's, Xray Science Division, 9700 S Cass Ave., Argonne, Illinois 60439, USA
| | - Michael Wulff
- European Synchrotron Radiation Facility, B.P. 220, F-380 43 Grenoble Cedex, France
| | - David van der Spoel
- Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, P.O. Box 596, SE-751 24 Uppsala, Sweden
| | - Richard Neutze
- Department of Chemistry and Molecular Biology, University of Gothenburg, SE-405 30 Gothenburg, Sweden
| | - Jan Davidsson
- Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 462, SE-751 20 Uppsala, Sweden
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Fortin C, Khanniche S, Khiri D, Fèvre-Nollet V, Lebègue P, Cousin F, Černušák I, Louis F. Reactivity of Hydrogen Peroxide with Br and I Atoms. J Phys Chem A 2018; 122:1053-1063. [PMID: 29290117 DOI: 10.1021/acs.jpca.7b10318] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reaction mechanisms of Br and I atoms with H2O2 have been investigated using DFT and high-level ab initio calculations. The H-abstraction and OH-abstraction channels were highlighted. The geometries of the stationary points were optimized at the B3LYP/aug-cc-pVTZ level of theory, and the energetics were recalculated with the coupled cluster theory. Spin-orbit coupling for each halogenated species was also explicitly computed by employing the MRCI level of theory. Thermochemistry for HOBr and HOI has been revised and updated standard enthalpies of formation at 298 K for HOBr and HOI are the following: ΔfH°298K(HOBr) = (-66.2 ± 4.6) kJ mol-1 and ΔfH°298K(HOI) = (-66.8 ± 4.7) kJ mol-1. The rate constants have been estimated using transition state theory (TST), canonical variational transition state theory (CVT), and CVT with small curvature tunneling (CVT/SCT) over a wide temperature range (250-2500 K). For the direct abstraction mechanism, the overall rate constant at 300 K was predicted to be 2.58 × 10-16 and 7.42 × 10-25 cm3 molecule-1s-1 for the Br + H2O2 and I + H2O2 reactions, respectively. The modified Arrhenius parameters have been estimated for the overall reactions: kBr+H2O2(T) = 4.80 × 10-26 T4.31 exp(-5.51 (kJ mol-1)/RT) and kI+H2O2(T) = 3.41 × 10-23 T3.29 exp(-56.32 (kJ mol-1)/RT).
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Affiliation(s)
- Camille Fortin
- Universite Lille, CNRS, UMR 8522 - PC2A - PhysicoChimie des Processus de Combustion et de l'Atmosphère , F-59000 Lille, France.,Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES , Cadarache, St Paul Lez Durance, 13115, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
| | - Sarah Khanniche
- Universite Lille, CNRS, UMR 8522 - PC2A - PhysicoChimie des Processus de Combustion et de l'Atmosphère , F-59000 Lille, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
| | - Dorra Khiri
- Universite Lille, CNRS, UMR 8522 - PC2A - PhysicoChimie des Processus de Combustion et de l'Atmosphère , F-59000 Lille, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
| | - Valérie Fèvre-Nollet
- Universite Lille, CNRS, UMR 8522 - PC2A - PhysicoChimie des Processus de Combustion et de l'Atmosphère , F-59000 Lille, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
| | - Patrick Lebègue
- Universite Lille, CNRS, UMR 8522 - PC2A - PhysicoChimie des Processus de Combustion et de l'Atmosphère , F-59000 Lille, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
| | - Frédéric Cousin
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES , Cadarache, St Paul Lez Durance, 13115, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
| | - Ivan Černušák
- Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava , Ilkovičova 6, 84215 Bratislava, Slovakia
| | - Florent Louis
- Universite Lille, CNRS, UMR 8522 - PC2A - PhysicoChimie des Processus de Combustion et de l'Atmosphère , F-59000 Lille, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R) , Cadarache, St Paul Lez Durance, 13115, France
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3
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Khanniche S, Louis F, Cantrel L, Černušák I. A Density Functional Theory and ab Initio Investigation of the Oxidation Reaction of CO by IO Radicals. J Phys Chem A 2016; 120:1737-49. [PMID: 26908233 DOI: 10.1021/acs.jpca.6b00047] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
To get an insight into the possible reactivity between iodine oxides and CO, a first step was to study the thermochemical properties and kinetic parameters of the reaction between IO and CO using theoretical chemistry tools. All stationary points involved were optimized using the Becke's three-parameter hybrid exchange functional coupled with the Lee-Yang-Parr nonlocal correlation functional (B3LYP) and the Møller-Plesset second-order perturbation theory (MP2). Single-point energy calculations were performed using the coupled cluster theory with the iterative inclusion of singles and doubles and the perturbative estimation for triple excitations (CCSD(T)) and the aug-cc-pVnZ (n = T, Q, and 5) basis sets on geometries previously optimized at the aug-cc-pVTZ level. The energetics was then recalculated using the one-component DK-CCSD(T) approach with the relativistic ANO basis sets. The spin-orbit coupling for the iodine containing species was calculated a posteriori using the restricted active space state interaction method in conjunction with the multiconfigurational perturbation theory (CASPT2/RASSI) employing the complete active space (CASSCF) wave function as the reference. The CCSD(T) energies were also corrected for BSSE for molecular complexes and refined with the extrapolation to CBS limit while the DK-CCSD(T) values were refined with the extrapolation to FCI. The exploration of the potential energy surface revealed a two-steps mechanism with a trans and a cis pathway. The rate constants for the direct and complex mechanism were computed as a function of temperature (250-2500 K) using the canonical transition state theory. The three-parameter Arrhenius expressions obtained for the direct and indirect mechanism at the DK-CCSD(T)-cf level of theory is 1.49 × 10(-17) × T(1.77) exp(-47.4 (kJ mol(-1))/RT).
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Affiliation(s)
- Sarah Khanniche
- University Lille, CNRS, UMR 8522-PC2A, PhysicoChimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R), Cadarache, St Paul Lez Durance, 13115, France
| | - Florent Louis
- University Lille, CNRS, UMR 8522-PC2A, PhysicoChimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R), Cadarache, St Paul Lez Durance, 13115, France
| | - Laurent Cantrel
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, Cadarache, St Paul Lez Durance, 13115, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité″ (C3R), Cadarache, St Paul Lez Durance, 13115, France
| | - Ivan Černušák
- Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava , Mlynská dolina CH1, 84215 Bratislava, Slovakia
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Šulková K, Cantrel L, Louis F. Gas-Phase Reactivity of Cesium-Containing Species by Quantum Chemistry. J Phys Chem A 2015; 119:9373-84. [PMID: 26237575 DOI: 10.1021/acs.jpca.5b05548] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Thermodynamics and kinetics of cesium species reactions have been studied by using high-level quantum chemical tools. A systematic theoretical study has been done to find suitable methodology for calculation of reliable thermodynamic properties, allowing us to determine bimolecular rate constants with appropriate kinetic theories of gas-phase reactions. Four different reactions have been studied in this work: CsO + H2 = CsOH + H (R1), Cs + HI = CsI + H (R2), CsI + H2O = CsOH + HI (R3), and CsI + OH = CsOH + I (R4). All reactions involve steam, hydrogen, and iodine in addition of cesium. Most of the reactions are fast and (R3) and (R4) proceed even without energetic barrier. In terms of chemical reactivity in the reactor coolant system (RCS) in the case of severe accident, it can be expected that there will be no kinetic limitations for main cesium species (CsOH and CsI) transported along the RCS. Cs chemical speciation inside the RCS should be governed by the thermodynamics.
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Affiliation(s)
- Katarína Šulková
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, SAG, LETR, St Paul Lez Durance 13115, France
| | - Laurent Cantrel
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, SAG, LETR, St Paul Lez Durance 13115, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité" (C3R), Centre de Cadarache, BP3, St Paul Lez Durance 13115, France
| | - Florent Louis
- PhysicoChimie des Processus de Combustion et de l'Atmosphère (PC2A), UMR CNRS 8522, Université Lille 1 Sciences et Technologies, 59655 Villeneuve d'Ascq Cedex, France.,Laboratoire de Recherche Commun IRSN-CNRS-Lille1 "Cinétique Chimique, Combustion, Réactivité" (C3R), Centre de Cadarache, BP3, St Paul Lez Durance 13115, France
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