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Vávra K, Döring E, Jakob J, Peterß F, Kaufmann M, Stahl P, Giesen TF, Fuchs GW. High-resolution infrared spectra and rovibrational analysis of the ν 12 band of propylene oxide. Phys Chem Chem Phys 2024. [PMID: 39233485 DOI: 10.1039/d4cp02943g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/06/2024]
Abstract
The high-resolution infrared spectrum of the fundamental band ν12 (ring breathing) of the chiral molecule propylene oxide (CH3CHCH2O) was recorded at room temperature and under jet-cooled conditions using a quantum cascade laser at 8 μm. The observed lines with quantum numbers J ≤ 55 and Ka ≤ 21 were assigned to strong b- and c-type bands, and some low J transitions were classified as weak a-type transitions. The lines were fitted using a Watsons A-reduced Hamiltonian in the Ir representation. From the rovibrational analysis the band origin as well as the rotational constants and four quartic centrifugal distortion constants were derived.
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Affiliation(s)
- Karel Vávra
- Institute of Physics, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Eileen Döring
- Institute of Physics, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Jan Jakob
- Institute of Physics, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Fabian Peterß
- Institute of Physics, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Matin Kaufmann
- Institute of Physics, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Pascal Stahl
- Institute of Physics, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Thomas F Giesen
- Institute of Physics, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
| | - Guido W Fuchs
- Institute of Physics, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany.
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2
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Potential Energy Surfaces for Noble Gas (Ar, Kr, Xe, Rn)–Propylene Oxide Systems: Analytical Formulation and Binding. Symmetry (Basel) 2022. [DOI: 10.3390/sym14020249] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Multidimensional potential energy surfaces for heavy noble gas–propylene oxide systems are obtained by applying the phenomenological method successfully used to describe homologous systems involving He and Ne atoms. Such potential energy surfaces, where the interaction exclusively arises from the anisotropic van der Waals interaction components, are given in an analytical form. Therefore, they can be easily used as force fields to carry out molecular simulations to evaluate spectroscopic features and the dynamical selectivity of weakly bound complexes formed by propylene oxide (a prototype chiral species) with a noble gas atom (a prototype isotropic partner) by two-body collisions under a variety of conditions. Several potential energy minima are identified on the surfaces, which are confirmed and characterized by high level ab initio calculations. The next step to further generalize this methodology is its extension to systems involving propylene oxide-diatomic molecules (as H2, O2 and N2), as well as to propylene oxide dimers.
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3
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Palazzetti F, Cappelletti D, Coletti C, Falcinelli S, Pirani F. Molecular beam scattering experiments on noble gas-propylene oxide: Total integral cross sections and potential energy surfaces of He- and Ne-C 3H 6O. J Chem Phys 2021; 155:234301. [PMID: 34937350 DOI: 10.1063/5.0073737] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The interactions of He and Ne with propylene oxide have been investigated with the molecular beam technique by measuring the total (elastic + inelastic) integral cross section as a function of collision velocity. Starting from the analysis of these experimental data, potential energy surfaces, formulated as a function of the separation distance and orientation of propylene oxide with respect to the interacting partners, have been built: The average depth of potential wells (located at intermediate separation distances) has been characterized by analyzing the observed "glory" quantum effects, and the strength of long-range attractions has been obtained from the magnitude and the velocity dependence of the smooth component of measured cross sections. The surfaces, tested and improved against new ab initio calculations of minima interaction energies at the complete basis set level of theory, are defined in the full space of relative configurations. This represents a crucial condition to provide force fields useful to carry out, in general, important molecular property simulations and to evaluate, in the present case, the spectroscopic features and the dynamical selectivity of weakly bound complexes formed by propylene oxide, a prototype chiral species, during collisions in interstellar clouds and winds, in the space and planetary atmospheres. The adopted formulation of the interaction can be readily extended to similar systems, involving heavier noble gases or diatomic molecules (H2, O2, and N2) as well as to propylene oxide dimers.
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Affiliation(s)
- Federico Palazzetti
- Dipartimento di Chimica, Biologia e Biotecnologie - Università degli Studi di Perugia, Perugia, Italy
| | - David Cappelletti
- Dipartimento di Chimica, Biologia e Biotecnologie - Università degli Studi di Perugia, Perugia, Italy
| | - Cecilia Coletti
- Dipartimento di Farmacia, Università degli Studi "G. D'Annunzio" Chieti-Pescara, Chieti, Italy
| | - Stefano Falcinelli
- Dipartimento di Ingegneria Civile ed Ambientale, Università degli Studi di Perugia, Perugia, Italy
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie - Università degli Studi di Perugia, Perugia, Italy
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4
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Ohno K, Kishimoto N, Iwamoto T, Satoh H, Watanabe H. High performance global exploration of isomers and isomerization channels on quantum chemical potential energy surface of H 5 C 2 NO 2. J Comput Chem 2021; 42:192-204. [PMID: 33146910 DOI: 10.1002/jcc.26446] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 10/14/2020] [Accepted: 10/16/2020] [Indexed: 11/07/2022]
Abstract
High performance global exploration of isomers and isomerization channels on the quantum chemical potential energy surface (PES) is performed for H5 C2 NO2 by using the scaled hypersphere search-anharmonic downward distortion following (SHS-ADDF) method. A multi-node operation, NeoGRRM, has achieved high performance exploration calculations for the large system by submitting SHS-ADDF sub-jobs into many cores in parallel and unifying the results of sub-jobs into the total lists of the main-job. Global exploration of equilibrium (EQ) and transition-state structures at the level of B3LYP/6-31G(d) gave 3210 EQs and 23278 TSs. Nine compounds were found in the low energy regions of 0-100 kJ/mol; the lowest energy compound is N-methylcarbamic acid, the second is methyl carbamate, and the third is glycine (the most fundamental amino acid). Interconversion pathways between the conformers of each of the low energy compounds were surveyed. Isomerization channels around glycine were explored in detail. The lowest energy barriers around some of the EQs turned to be negative after zero-point energy corrections. This indicates that those structures cannot exist as independent structures because they spontaneously collapse into more stable structures. The global PES search showed various interesting dissociating channels which indicate synthon reaction pathways in the reverse directions.
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Affiliation(s)
- Koichi Ohno
- Institute for Quantum Chemical Exploration, Tokyo, Japan.,Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Japan
| | - Naoki Kishimoto
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Japan
| | - Takeaki Iwamoto
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Japan
| | - Hiroko Satoh
- Institute for Quantum Chemical Exploration, Tokyo, Japan.,Department of Chemistry, University of Zurich, Zurich, Switzerland.,Research Organization of Information and Systems (ROIS), Tokyo, Japan
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5
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Kodaya Y, Yamakado H, Ohno K. Limited Search Characteristics of the Scaled Hypersphere Search Method: A Systematic Case Study for Isomers of BCNOS. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2018. [DOI: 10.1246/bcsj.20180107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yoshitomo Kodaya
- Graduate School of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama 640-8510, Japan
| | - Hideo Yamakado
- Faculty of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama 640-8510, Japan
| | - Koichi Ohno
- Graduate School of Science, Tohoku University, 6-3 Aramaki Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan
- Institute for Quantum Chemical Exploration, LOOP-X, 3-9-15 Kaigan, Minato-ku, Tokyo 108-0022, Japan
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6
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Lei X, Chen D, Wang W, Liu F, Wang W. Quantum chemical studies of the OH-initiated oxidation reactions of propenols in the presence of O2. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1537527] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Xiaoyang Lei
- Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an, People’s Republic of China
| | - Dongping Chen
- Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an, People’s Republic of China
| | - Weina Wang
- Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an, People’s Republic of China
| | - Fengyi Liu
- Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an, People’s Republic of China
| | - Wenliang Wang
- Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an, People’s Republic of China
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7
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Shaw MF, Sztáray B, Whalley LK, Heard DE, Millet DB, Jordan MJT, Osborn DL, Kable SH. Photo-tautomerization of acetaldehyde as a photochemical source of formic acid in the troposphere. Nat Commun 2018; 9:2584. [PMID: 29968712 PMCID: PMC6030138 DOI: 10.1038/s41467-018-04824-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2018] [Accepted: 04/24/2018] [Indexed: 11/08/2022] Open
Abstract
Organic acids play a key role in the troposphere, contributing to atmospheric aqueous-phase chemistry, aerosol formation, and precipitation acidity. Atmospheric models currently account for less than half the observed, globally averaged formic acid loading. Here we report that acetaldehyde photo-tautomerizes to vinyl alcohol under atmospherically relevant pressures of nitrogen, in the actinic wavelength range, λ = 300-330 nm, with measured quantum yields of 2-25%. Recent theoretical kinetics studies show hydroxyl-initiated oxidation of vinyl alcohol produces formic acid. Adding these pathways to an atmospheric chemistry box model (Master Chemical Mechanism) demonstrates increased formic acid concentrations by a factor of ~1.7 in the polluted troposphere and a factor of ~3 under pristine conditions. Incorporating this mechanism into the GEOS-Chem 3D global chemical transport model reveals an estimated 7% contribution to worldwide formic acid production, with up to 60% of the total modeled formic acid production over oceans arising from photo-tautomerization.
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Affiliation(s)
- Miranda F Shaw
- School of Chemistry, University of Sydney, Sydney, NSW, 2006, Australia
| | - Bálint Sztáray
- Department of Chemistry, University of the Pacific, Stockton, CA, 95211, USA
| | - Lisa K Whalley
- School of Chemistry and National Centre for Atmospheric Science, University of Leeds, Leeds, LS2 9JT, UK
| | - Dwayne E Heard
- School of Chemistry and National Centre for Atmospheric Science, University of Leeds, Leeds, LS2 9JT, UK
| | - Dylan B Millet
- Department of Soil, Water, and Climate, University of Minnesota, Minneapolis-Saint Paul, MN, 55108, USA
| | | | - David L Osborn
- Combustion Research Facility, Sandia National Laboratories, Livermore, CA, 94551, USA.
| | - Scott H Kable
- School of Chemistry, University of New South Wales, Sydney, NSW, 2052, Australia.
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8
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Falcinelli S, Vecchiocattivi F, Alagia M, Schio L, Richter R, Stranges S, Catone D, Arruda MS, Mendes LAV, Palazzetti F, Aquilanti V, Pirani F. Double photoionization of propylene oxide: A coincidence study of the ejection of a pair of valence-shell electrons. J Chem Phys 2018; 148:114302. [PMID: 29566526 DOI: 10.1063/1.5024408] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Propylene oxide, a favorite target of experimental and theoretical studies of circular dichroism, was recently discovered in interstellar space, further amplifying the attention to its role in the current debate on protobiological homochirality. In the present work, a photoelectron-photoion-photoion coincidence technique, using an ion-imaging detector and tunable synchrotron radiation in the 18.0-37.0 eV energy range, permits us (i) to observe six double ionization fragmentation channels, their relative yields being accounted for about two-thirds by the couple (C2H4+, CH2O+) and one-fifth by (C2H3+, CH3O+); (ii) to measure thresholds for their openings as a function of photon energy; and (iii) to unravel a pronounced bimodality for a kinetic-energy-released distribution, fingerprint of competitive non-adiabatic mechanisms.
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Affiliation(s)
- Stefano Falcinelli
- Dipartimento di Ingegneria Civile ed Ambientale, Università di Perugia, Via G. Duranti 93, 06125 Perugia, Italy
| | - Franco Vecchiocattivi
- Dipartimento di Ingegneria Civile ed Ambientale, Università di Perugia, Via G. Duranti 93, 06125 Perugia, Italy
| | - Michele Alagia
- IOM-CNR Tasc, Km 163.5, Area Science Park, 34149 Basovizza, Trieste, Italy
| | - Luca Schio
- IOM-CNR Tasc, Km 163.5, Area Science Park, 34149 Basovizza, Trieste, Italy
| | - Robert Richter
- Elettra-Sincrotrone Trieste, Area Science Park, 34149 Basovizza, Trieste, Italy
| | - Stefano Stranges
- IOM-CNR Tasc, Km 163.5, Area Science Park, 34149 Basovizza, Trieste, Italy
| | - Daniele Catone
- Istituto di Struttura della Materia (CNR-ISM), Area della Ricerca di Roma Tor Vergata, Via del Fosso del Cavaliere, 100-00133 Roma, Italy
| | - Manuela S Arruda
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Luiz A V Mendes
- Instituto de Fìsica, Universidade Federal da Bahia, Campus Universitario de Ondina, 40210-340 Salvador, BA, Brazil
| | - Federico Palazzetti
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Vincenzo Aquilanti
- Istituto di Struttura della Materia (CNR-ISM), Area della Ricerca di Roma Tor Vergata, Via del Fosso del Cavaliere, 100-00133 Roma, Italy
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
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9
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Grajales-González E, Monge-Palacios M, Sarathy SM. Theoretical Kinetic Study of the Unimolecular Keto–Enol Tautomerism Propen-2-ol ↔ Acetone. Pressure Effects and Implications in the Pyrolysis of tert- and 2-Butanol. J Phys Chem A 2018; 122:3547-3555. [DOI: 10.1021/acs.jpca.8b00836] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- E. Grajales-González
- Clean Combustion Research Center, King Abdullah University of Science and Technology, Al Kindi Building 5, Thuwal 23955, Saudi Arabia
| | - M. Monge-Palacios
- Clean Combustion Research Center, King Abdullah University of Science and Technology, Al Kindi Building 5, Thuwal 23955, Saudi Arabia
| | - S. Mani Sarathy
- Clean Combustion Research Center, King Abdullah University of Science and Technology, Al Kindi Building 5, Thuwal 23955, Saudi Arabia
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10
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Lombardi A, Palazzetti F. Chirality in molecular collision dynamics. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:063003. [PMID: 29350184 DOI: 10.1088/1361-648x/aaa1c8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Chirality is a phenomenon that permeates the natural world, with implications for atomic and molecular physics, for fundamental forces and for the mechanisms at the origin of the early evolution of life and biomolecular homochirality. The manifestations of chirality in chemistry and biochemistry are numerous, the striking ones being chiral recognition and asymmetric synthesis with important applications in molecular sciences and in industrial and pharmaceutical chemistry. Chiral discrimination phenomena, due to the existence of two enantiomeric forms, very well known in the case of interaction with light, but still nearly disregarded in molecular collision studies. Here we review some ideas and recent advances about the role of chirality in molecular collisions, designing and illustrating molecular beam experiments for the demonstration of chiral effects and suggesting a scenario for a stereo-directional origin of chiral selection.
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Affiliation(s)
- Andrea Lombardi
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto 8, 06123, Perugia, Italy. Consortium for Computational Molecular and Materials Sciences (CMS)2, Via Elce di Sotto, 8, 06123 Perugia, Italy
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11
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Kondo Y, Ishikawa K, Hayashi T, Sekine M, Hori M. Electron impact ionization of perfluoro-methyl-vinyl-ether C3F6O. ACTA ACUST UNITED AC 2018. [DOI: 10.1088/1361-6595/aaa22e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12
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Lee KLK, Nauta K, Kable SH. Photodissociation of acetone from 266 to 312 nm: Dynamics of CH3 + CH3CO channels on the S0 and T1 states. J Chem Phys 2017; 146:044304. [DOI: 10.1063/1.4974035] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Kin Long Kelvin Lee
- School of Chemistry, University of New South Wales, Kensington, New South Wales 2052, Australia
| | - Klaas Nauta
- School of Chemistry, University of New South Wales, Kensington, New South Wales 2052, Australia
| | - Scott H. Kable
- School of Chemistry, University of New South Wales, Kensington, New South Wales 2052, Australia
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13
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Ohno K, Kishimoto N, Iwamoto T, Satoh H. Global exploration of isomers and isomerization channels on the quantum chemical potential energy surface of H3
CNO3. J Comput Chem 2017; 38:669-687. [DOI: 10.1002/jcc.24732] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 12/23/2016] [Accepted: 12/29/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Koichi Ohno
- Institute for Quantum Chemical Exploration, Kaigan 3-9-15; Minato-ku Tokyo 108-0022 Japan
- Department of Chemistry; Graduate School of Science, Tohoku University, Aramaki Aza-Aoba 6-3, Aoba-ku; Sendai Miyagi 980-8577 Japan
| | - Naoki Kishimoto
- Department of Chemistry; Graduate School of Science, Tohoku University, Aramaki Aza-Aoba 6-3, Aoba-ku; Sendai Miyagi 980-8577 Japan
| | - Takeaki Iwamoto
- Department of Chemistry; Graduate School of Science, Tohoku University, Aramaki Aza-Aoba 6-3, Aoba-ku; Sendai Miyagi 980-8577 Japan
| | - Hiroko Satoh
- Institute for Quantum Chemical Exploration, Kaigan 3-9-15; Minato-ku Tokyo 108-0022 Japan
- Department of Chemistry; University of Zurich; Zurich 8057 Switzerland
- Research Organization of Information and Systems (ROIS); Tokyo 105-0001 Japan
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14
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Ohno K. Study of Potential Energy Surfaces towards Global Reaction Route Mapping. CHEM REC 2016; 16:2198-2218. [PMID: 27059804 DOI: 10.1002/tcr.201500284] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2015] [Indexed: 11/11/2022]
Abstract
The potential energy surface (PES) is just a theoretical construct based on the Born-Oppenheimer approximation, but it underlies various phenomena, including molecular vibrations, collisional ionizations, and chemical reactions. This account describes how a new idea for global reaction route mapping (GRRM), which had seemed to be impossible for chemical systems with more than three atoms, was born and has been developed during the course of the study of the PES. GRRM has pioneered new fields of chemistry. Furthermore, techniques for GRRM are still developing, and GRRM is further extending its application to various areas of chemistry and chemical physics.
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Affiliation(s)
- Koichi Ohno
- Institute for Quantum Chemical Exploration, Minato-ku, Tokyo, 108-0022, Japan.
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15
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Kawano J, Maeda S, Nagai T. The effect of Mg2+ incorporation on the structure of calcium carbonate clusters: investigation by the anharmonic downward distortion following method. Phys Chem Chem Phys 2016; 18:2690-8. [DOI: 10.1039/c5cp05139h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A structure similar to calcite appears when only four CaCO3 units aggregate into the cluster, and the addition of Mg changes its structure.
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Affiliation(s)
- Jun Kawano
- Creative Research Institution (CRIS)
- Hokkaido University
- Sapporo
- 001-0021 Japan
- Department of Earth and Planetary Sciences
| | - Satoshi Maeda
- Department of Chemistry
- Faculty of Science
- Hokkaido University
- Sapporo
- 060-0810 Japan
| | - Takaya Nagai
- Department of Earth and Planetary Sciences
- Faculty of Science
- Hokkaido University
- Sapporo
- 060-0810 Japan
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16
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A model study of hydrothermal reactions of trigonal dipyramidal Zn5 cluster with two water molecules. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.07.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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Lombardi A, Faginas-Lago N, Pacifici L, Grossi G. Energy transfer upon collision of selectively excited CO2 molecules: State-to-state cross sections and probabilities for modeling of atmospheres and gaseous flows. J Chem Phys 2015. [PMID: 26203027 DOI: 10.1063/1.4926880] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Carbon dioxide molecules can store and release tens of kcal/mol upon collisions, and such an energy transfer strongly influences the energy disposal and the chemical processes in gases under the extreme conditions typical of plasmas and hypersonic flows. Moreover, the energy transfer involving CO2 characterizes the global dynamics of the Earth-atmosphere system and the energy balance of other planetary atmospheres. Contemporary developments in kinetic modeling of gaseous mixtures are connected to progress in the description of the energy transfer, and, in particular, the attempts to include non-equilibrium effects require to consider state-specific energy exchanges. A systematic study of the state-to-state vibrational energy transfer in CO2 + CO2 collisions is the focus of the present work, aided by a theoretical and computational tool based on quasiclassical trajectory simulations and an accurate full-dimension model of the intermolecular interactions. In this model, the accuracy of the description of the intermolecular forces (that determine the probability of energy transfer in molecular collisions) is enhanced by explicit account of the specific effects of the distortion of the CO2 structure due to vibrations. Results show that these effects are important for the energy transfer probabilities. Moreover, the role of rotational and vibrational degrees of freedom is found to be dominant in the energy exchange, while the average contribution of translations, under the temperature and energy conditions considered, is negligible. Remarkable is the fact that the intramolecular energy transfer only involves stretching and bending, unless one of the colliding molecules has an initial symmetric stretching quantum number greater than a threshold value estimated to be equal to 7.
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Affiliation(s)
- A Lombardi
- Dipartimento di Chimica, Università di Perugia, via Elce di Sotto 8, 06123 Perugia, Italy
| | - N Faginas-Lago
- Dipartimento di Chimica, Università di Perugia, via Elce di Sotto 8, 06123 Perugia, Italy
| | - L Pacifici
- Dipartimento di Chimica, Università di Perugia, via Elce di Sotto 8, 06123 Perugia, Italy
| | - G Grossi
- Dipartimento di Chimica, Università di Perugia, via Elce di Sotto 8, 06123 Perugia, Italy
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18
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Accurate analytic intermolecular potential for the simulation of Na+ and K+ ion hydration in liquid water. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.01.029] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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19
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Maeda S, Taketsugu T, Morokuma K, Ohno K. Anharmonic Downward Distortion Following for Automated Exploration of Quantum Chemical Potential Energy Surfaces. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2014. [DOI: 10.1246/bcsj.20140189] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Satoshi Maeda
- Department of Chemistry, Faculty of Science, Hokkaido University
| | | | - Keiji Morokuma
- Fukui Institute for Fundamental Chemistry, Kyoto University
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University
| | - Koichi Ohno
- Graduate School of Science, Tohoku University
- Institute for Quantum Chemical Exploration
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20
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21
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Kaur G, Vikas. Exploring water catalysis in the reaction of thioformic acid with hydroxyl radical: a global reaction route mapping perspective. J Phys Chem A 2014; 118:4019-29. [PMID: 24835635 DOI: 10.1021/jp503213n] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Hydrogen abstraction pathways, in the gas-phase reaction of tautomers of thioformic acid (TFA), TFA(thiol), and TFA(thione), with hydroxyl radical in the presence and absence of single water molecule acting as a catalyst, is investigated with high-level quantum mechanical calculations at CCSD(T)/6-311++G(2d,2p)//MP2/6-311++G(2d,2p), CCSD(T)/6-311++G(d,p)//DFT/BHandHLYP/6-311++G(d,p), and DFT/B3LYP/6-311++G(2df,2p) levels of the theory. A systematic and automated search of the potential energy surface (PES) for the reaction pathways is performed using the global reaction route mapping (GRRM) method that employs an uphill walking technique to search prereaction complexes and transition states. The computations reveal significant lowering of the PES and substantial reduction in the activation energy for the hydrogen abstraction pathway in the presence of water, thereby proving water as an efficient catalyst in the reaction of both the TFA tautomers with OH radical. The hydrogen-bonding interactions are observed to be responsible for the large catalytic effect of water. Notably, in the case of TFA(thiol), formyl hydrogen abstraction is observed to be kinetically more favorable, while acidic hydrogen abstraction is observed to be thermodynamically more feasible. Interestingly, in the case of TFA(thione), reaction pathways involving only formyl hydrogen abstraction were observed to be feasible. The water-catalyzed hydrogen abstraction reaction of TFA with hydroxyl radical, investigated in this work, can provide significant insights into the corresponding reaction in the biological systems.
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Affiliation(s)
- Gurpreet Kaur
- Quantum Chemistry Group, Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University , Chandigarh 160014, India
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Vikas, Kaur G. Global reaction route mapping of isomerization pathways of exotic C6H molecular species. J Chem Phys 2013; 139:224311. [DOI: 10.1063/1.4840755] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Parnis JM, King KA, Thompson MGK. Acetone cation chemistry under varying electron density conditions: from unimolecular decomposition to dissociative recombination processes. JOURNAL OF MASS SPECTROMETRY : JMS 2013; 48:1224-1231. [PMID: 24259211 DOI: 10.1002/jms.3284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 09/19/2013] [Accepted: 09/24/2013] [Indexed: 06/02/2023]
Abstract
The chemistry of ionized acetone:Ar mixtures under varied ionizing electron density conditions has been studied using matrix-isolation techniques. Gaseous acetone diluted in excess argon gas was subjected to electron bombardment with 300 eV electrons at currents between 20 and 200 μA. Linear wire 'pin' and metal 'plate' electron collector geometries were employed, allowing a wide range of electron density conditions to be explored. The products of subsequent reaction processes were matrix isolated and analyzed by Fourier transform infrared absorption spectroscopy. Products included methane, ketene, 1-propen-2-ol (the enol isomer of acetone), CO, HCO, ethane, ethane, acetylene and CCCO. Product absolute and relative yields varied with acetone number density, the choice of anode geometry and the rate of electron bombardment. The overall chemistry observed is rationalized in terms of mechanistic steps involving unimolecular cation decomposition, ion-molecule reactions, radical-radical reactions and dissociative recombination processes.
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Affiliation(s)
- J Mark Parnis
- Department of Chemistry, Trent University, Peterborough, ON, Canada, K9J 7B8
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Lombardi A, Faginas-Lago N, Pacifici L, Costantini A. Modeling of Energy Transfer From Vibrationally Excited CO2 Molecules: Cross Sections and Probabilities for Kinetic Modeling of Atmospheres, Flows, and Plasmas. J Phys Chem A 2013; 117:11430-40. [PMID: 24117231 DOI: 10.1021/jp408522m] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrea Lombardi
- Dipartimento di Chimica, Università di Perugia, via Elce
di Sotto 8, 06123 Perugia, Italy
| | - Noelia Faginas-Lago
- Dipartimento di Chimica, Università di Perugia, via Elce
di Sotto 8, 06123 Perugia, Italy
| | - Leonardo Pacifici
- Dipartimento di Chimica, Università di Perugia, via Elce
di Sotto 8, 06123 Perugia, Italy
| | - Alessandro Costantini
- Dipartimento di Chimica, Università di Perugia, via Elce
di Sotto 8, 06123 Perugia, Italy
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Yang X, Yan B, Xu H, Zhu R, Zhang M, Ding D. Analysis of Potential Energy Surface for Butanone Isomerization. CHINESE J CHEM PHYS 2013. [DOI: 10.1063/1674-0068/26/05/519-525] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Aligned molecules: chirality discrimination in photodissociation and in molecular dynamics. RENDICONTI LINCEI-SCIENZE FISICHE E NATURALI 2013. [DOI: 10.1007/s12210-013-0248-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Stochastic models of chiral symmetry breaking in autocatalytic networks with anomalous fluctuations. RENDICONTI LINCEI 2013. [DOI: 10.1007/s12210-013-0234-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Aligned molecular collisions and a stereodynamical mechanism for selective chirality. RENDICONTI LINCEI-SCIENZE FISICHE E NATURALI 2011. [DOI: 10.1007/s12210-011-0123-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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