201
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Affiliation(s)
- Julie Grouleff
- Department of Chemistry, Aarhus University, DK-8000 Aarhus, Denmark
| | - Frank Jensen
- Department of Chemistry, Aarhus University, DK-8000 Aarhus, Denmark
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202
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Maeda S, Saito R, Morokuma K. Finding Minimum Structures on the Seam of Crossing in Reactions of Type A + B → X: Exploration of Nonadiabatic Ignition Pathways of Unsaturated Hydrocarbons. J Phys Chem Lett 2011; 2:852-857. [PMID: 26295618 DOI: 10.1021/jz200262m] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A new theoretical approach is proposed for finding automatically minimum structures on the seam of crossing (MSX) in reactions of type A + B → X, where the artificial-force-induced reaction (AFIR) method is combined with the seam model function (SMF) approach. Its application to reactions between triplet dioxygen and unsaturated hydrocarbons provided many MSX structures. In addition to known ignition pathways, we discovered a pathway through a new type of MSX in the reaction of dioxygen with aromatic hydrocarbons; for benzene, this new pathway requires a lower energy than those of three known ignition pathways and is likely to be the most important. This demonstrates that the AFIR-SMF approach has the ability to discover unknown/unexpected MSX structures without prejudice for presumed pathways or mechanisms.
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Affiliation(s)
- Satoshi Maeda
- †The Hakubi Center, Kyoto University, Kyoto 606-8302, Japan
- ‡Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
| | - Ryo Saito
- ‡Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
- §Faculty of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Keiji Morokuma
- ‡Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
- ⊥Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
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203
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Mizuse K, Kuo JL, Fujii A. Structural trends of ionized water networks: Infrared spectroscopy of watercluster radical cations (H2O)n+ (n = 3–11). Chem Sci 2011. [DOI: 10.1039/c0sc00604a] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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204
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Ab initio anharmonic calculations of vibrational frequencies of benzene by means of efficient construction of potential energy functions. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.01.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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205
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Theoretical study on mechanisms of structural rearrangement and ionic dissociation in the HCl(H2O)4 cluster with path-integral molecular dynamics simulations. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2010.11.051] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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206
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Arai K, Dedachi K, Iwaoka M. Rapid and quantitative disulfide bond formation for a polypeptide chain using a cyclic selenoxide reagent in an aqueous medium. Chemistry 2010; 17:481-5. [PMID: 21207564 DOI: 10.1002/chem.201002742] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Indexed: 11/10/2022]
Abstract
To elucidate the reaction mechanism of the disulfide (SS) bond formation reaction of a polypeptide molecule with a water-soluble selenoxide reagent, trans-3,4-dihydroxyselenolane oxide (DHS(ox)), short-term oxidation experiments were carried out for the reduced state (R) of a recombinant hirudin CX-397 variant at pH 7.0 and 25 °C. In the reaction, R was oxidized sequentially to one-SS, two-SS, and three-SS intermediate ensembles within 1 min. The kinetic analysis revealed that the three second-order rate constants for the SS formation are proportional to the number of thiol groups existing in the reactant SS intermediates, indicating the stochastic nature of the SS formation. Ab initio calculation at the HF/6-31++G(d,p) level in water by using the polarizable continuum model suggested that the SS formation reaction is highly exothermic and proceeds via a reactive thioselenurane intermediate with a distorted linear O-Se-S linkage. The results clearly demonstrated that the rate-determining step of the SS formation reaction is the first bimolecular process between a thiol substrate and DHS(ox) rather than the subsequent process to release a SS product.
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Affiliation(s)
- Kenta Arai
- Department of Chemistry, School of Science, Tokai University, Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan
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207
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Sada M, Komagawa S, Uchiyama M, Kobata M, Mizuno T, Utimoto K, Oshima K, Matsubara S. Reaction Pathway of Methylenation of Carbonyl Compounds with Bis(iodozincio)methane. J Am Chem Soc 2010; 132:17452-8. [DOI: 10.1021/ja104439w] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mutsumi Sada
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoudai-katsura, Nishikyo, Kyoto 615-8510, Japan, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8510, Japan
| | - Shinsuke Komagawa
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoudai-katsura, Nishikyo, Kyoto 615-8510, Japan, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8510, Japan
| | - Masanobu Uchiyama
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoudai-katsura, Nishikyo, Kyoto 615-8510, Japan, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8510, Japan
| | - Masami Kobata
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoudai-katsura, Nishikyo, Kyoto 615-8510, Japan, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8510, Japan
| | - Tsuyoshi Mizuno
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoudai-katsura, Nishikyo, Kyoto 615-8510, Japan, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8510, Japan
| | - Kiitiro Utimoto
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoudai-katsura, Nishikyo, Kyoto 615-8510, Japan, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8510, Japan
| | - Koichiro Oshima
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoudai-katsura, Nishikyo, Kyoto 615-8510, Japan, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8510, Japan
| | - Seijiro Matsubara
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoudai-katsura, Nishikyo, Kyoto 615-8510, Japan, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Department of Industrial Chemistry, Faculty of Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8510, Japan
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208
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Maeda S, Matsuda Y, Mizutani S, Fujii A, Ohno K. Long-Range Migration of a Water Molecule To Catalyze a Tautomerization in Photoionization of the Hydrated Formamide Cluster. J Phys Chem A 2010; 114:11896-9. [DOI: 10.1021/jp107034y] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Satoshi Maeda
- Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan and Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Yoshiyuki Matsuda
- Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan and Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Shinichi Mizutani
- Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan and Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Asuka Fujii
- Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan and Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Koichi Ohno
- Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan and Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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209
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Nádasdi R, Zügner GL, Farkas M, Dóbé S, Maeda S, Morokuma K. Photochemistry of Methyl Ethyl Ketone: Quantum Yields and S
1
/S
0
‐Diradical Mechanism of Photodissociation. Chemphyschem 2010; 11:3883-95. [DOI: 10.1002/cphc.201000522] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Rebeka Nádasdi
- Institute of Materials and Environmental Chemistry, Chemical Research Center of the Hungarian Academy of Sciences, Pusztaszeri út 59‐67, 1025 Budapest (Hungary), Fax: +36‐1‐438‐1147
| | - Gábor L. Zügner
- Institute of Materials and Environmental Chemistry, Chemical Research Center of the Hungarian Academy of Sciences, Pusztaszeri út 59‐67, 1025 Budapest (Hungary), Fax: +36‐1‐438‐1147
| | - Mária Farkas
- Institute of Materials and Environmental Chemistry, Chemical Research Center of the Hungarian Academy of Sciences, Pusztaszeri út 59‐67, 1025 Budapest (Hungary), Fax: +36‐1‐438‐1147
| | - Sándor Dóbé
- Institute of Materials and Environmental Chemistry, Chemical Research Center of the Hungarian Academy of Sciences, Pusztaszeri út 59‐67, 1025 Budapest (Hungary), Fax: +36‐1‐438‐1147
| | - Satoshi Maeda
- Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606‐8501 (Japan), Fax: +81‐75‐781‐4757
- The Hakubi Center, Kyoto University, Kyoto 606‐8501 (Japan)
| | - Keiji Morokuma
- Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606‐8501 (Japan), Fax: +81‐75‐781‐4757
- Department of Chemistry and Cherry L. Emerson Centre for Scientific Computation, Emory University, Atlanta, GA 30322 (USA)
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210
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Elango M, Maciel GS, Palazzetti F, Lombardi A, Aquilanti V. Quantum chemistry of C(3)H(6)O molecules: structure and stability, isomerization pathways, and chirality changing mechanisms. J Phys Chem A 2010; 114:9864-74. [PMID: 20575571 DOI: 10.1021/jp1034618] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Electronic structure calculations were carried out to study the various isomers of formula C(3)H(6)O, as a part of our current quantum chemical and dynamical approaches to intra- and intermolecular kinetics for the C(n)H(2n)O (n = 1, 2, 3) molecules. The usefulness of the GRRM (global reaction route mapping) program developed by Ohno and Maeda in predicting the structure of all isomers and of the transition states connecting them is fully exploited. All the isomers are identified as local minima on the MP2/CC-PVDZ potential energy surface. Acetone is the most stable isomer. In increasing order of stability the others are propanal, 2-propenol, 1-propenol, allyl alcohol, methyl vinyl ether, cyclopropanol, propylene oxide, and oxetane. Various isomerization paths connecting them are identified. All the transition states are fully characterized using intrinsic reaction coordinate calculations. The isomerization reactions may proceed through a single step or involve an intermediate species which is either a carbene or a diradical. Special attention is devoted to propylene oxide, a favorite molecule in current photochemical and stereodynamical studies because of its chiral nature. It is a rigid molecule, and chirality switching is found to be supported by its isomers. Two different chirality switching mechanisms which are assisted by propanal and allyl alcohol are presented.
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Affiliation(s)
- Munusamy Elango
- Dipartimento di Chimica, Universita di Perugia, 06123 Perugia, Italy
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211
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Matsuda Y, Yamada A, Hanaue KI, Mikami N, Fujii A. Catalytic Action of a Single Water Molecule in a Proton-Migration Reaction. Angew Chem Int Ed Engl 2010; 49:4898-901. [DOI: 10.1002/anie.201001364] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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212
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Matsuda Y, Yamada A, Hanaue KI, Mikami N, Fujii A. Catalytic Action of a Single Water Molecule in a Proton-Migration Reaction. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201001364] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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213
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Maeda S, Ohno K, Morokuma K. Updated Branching Plane for Finding Conical Intersections without Coupling Derivative Vectors. J Chem Theory Comput 2010; 6:1538-45. [DOI: 10.1021/ct1000268] [Citation(s) in RCA: 117] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Satoshi Maeda
- Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan, Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480−1192, Japan, and Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322
| | - Koichi Ohno
- Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan, Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480−1192, Japan, and Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322
| | - Keiji Morokuma
- Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan, Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480−1192, Japan, and Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322
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214
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Kerkines ISK, Morokuma K, Iordanova N, Viggiano AA. Experimental and theoretical study of the reaction of POCl(3) (-) with O(2). J Chem Phys 2010; 132:044309. [PMID: 20113035 DOI: 10.1063/1.3299276] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The oxidation of the trichlorooxyphosphorus anion (POCl(3) (-)), which takes place in combustion flames, has been examined experimentally at a variety of temperatures and theoretically via ab initio and density functional methods. The reaction was examined in a turbulent ion flow tube and kinetics was measured between 300 and 626 K, estimating an overall reaction barrier of 1.23 kcal/mol. Calculations at the density functional, Moller-Plesset second order perturbation, and coupled cluster levels of theory with basis sets up to augmented triple-zeta quality point to a multistep reaction mechanism involving an initial [OP(Cl)(3)(OO)](-) intermediate, an adduct between triplet O(2) with POCl(3) (-), subsequent formation of a four-membered nonplanar P-O-O-Cl ring transition state, with concomitant breaking of the P-Cl and O-O bonds to provide a transient intermediate [OP(Cl)(2)OO...Cl](-), which, in turn, converts to the product complex (POCl(2) (-))(ClO) upon formation of the Cl-O bond without barrier. The calculated energy of the four-membered transition state is considered to be in good agreement with the small overall barrier found by experiment. The final step is responsible for the large exothermicity of the reaction.
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Affiliation(s)
- Ioannis S K Kerkines
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, USA
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215
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Xu H, Okino T, Nakai K, Yamanouchi K, Roither S, Xie X, Kartashov D, Schöffler M, Baltuska A, Kitzler M. Hydrogen migration and C–C bond breaking in 1,3-butadiene in intense laser fields studied by coincidence momentum imaging. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2009.11.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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216
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Iwamoto T, Ohnishi N, Gui Z, Ishida S, Isobe H, Maeda S, Ohno K, Kira M. Synthesis and structure of stable base-free dialkylsilanimines. NEW J CHEM 2010. [DOI: 10.1039/c0nj00121j] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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217
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Ohta K, Matsuda Y, Mikami N, Fujii A. Intermolecular proton-transfer in acetic acid clusters induced by vacuum-ultraviolet photoionization. J Chem Phys 2009; 131:184304. [DOI: 10.1063/1.3257686] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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218
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Maeda S, Ohno K, Morokuma K. An Automated and Systematic Transition Structure Explorer in Large Flexible Molecular Systems Based on Combined Global Reaction Route Mapping and Microiteration Methods. J Chem Theory Comput 2009; 5:2734-43. [DOI: 10.1021/ct9003383] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Satoshi Maeda
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan, and Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
| | - Koichi Ohno
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan, and Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
| | - Keiji Morokuma
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan, and Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
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219
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Luo Y, Maeda S, Ohno K. Automated exploration of stable isomers of H+(H2O)n(n= 5-7) viaab initiocalculations: An application of the anharmonic downward distortion following algorithm. J Comput Chem 2009; 30:952-61. [DOI: 10.1002/jcc.21117] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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220
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Path-integral molecular dynamics simulations of hydrated hydrogen chloride cluster HCl(H2O)4 on a semiempirical potential energy surface. Chem Phys 2009. [DOI: 10.1016/j.chemphys.2009.01.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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221
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Zhang P, Maeda S, Morokuma K, Braams BJ. Photochemical reactions of the low-lying excited states of formaldehyde: T1/S0 intersystem crossings, characteristics of the S1 and T1 potential energy surfaces, and a global T1 potential energy surface. J Chem Phys 2009; 130:114304. [DOI: 10.1063/1.3085952] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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222
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Moteki M, Maeda S, Ohno K. Systematic Search for Isomerization Pathways of Hexasilabenzene for Finding Its Kinetic Stability. Organometallics 2009. [DOI: 10.1021/om800881y] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Masahiro Moteki
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Satoshi Maeda
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Koichi Ohno
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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223
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Luo Y, Maeda S, Ohno K. Water-catalyzed gas-phase reaction of formic acid with hydroxyl radical: A computational investigation. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2008.12.087] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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224
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Maeda S, Ohno K, Morokuma K. Automated Global Mapping of Minimal Energy Points on Seams of Crossing by the Anharmonic Downward Distortion Following Method: A Case Study of H2CO. J Phys Chem A 2009; 113:1704-10. [DOI: 10.1021/jp810898u] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Satoshi Maeda
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, Department of Chemistry, Tohoku University, Sendai 980-8578, Japan, and Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
| | - Koichi Ohno
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, Department of Chemistry, Tohoku University, Sendai 980-8578, Japan, and Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
| | - Keiji Morokuma
- Department of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, Department of Chemistry, Tohoku University, Sendai 980-8578, Japan, and Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto 606-8103, Japan
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225
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Luo Y, Maeda S, Ohno K. Decomposition of alkyl hydroperoxide by a copper(I) complex: insights from density functional theory. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.09.065] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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226
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Watanabe Y, Maeda S, Ohno K. Intramolecular vibrational frequencies of water clusters (H2O)n (n=2–5): Anharmonic analyses using potential functions based on the scaled hypersphere search method. J Chem Phys 2008; 129:074315. [DOI: 10.1063/1.2973605] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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227
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A new global reaction route map on the potential energy surface of H2CO with unrestricted level. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.06.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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228
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Luo Y, Maeda S, Ohno K. DFT Study on Isomerization and Decomposition of Cuprous Dialkyldithiophosphate and Its Reaction with Alkylperoxy Radical. J Phys Chem A 2008; 112:5720-6. [DOI: 10.1021/jp801571b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yi Luo
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Satoshi Maeda
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Koichi Ohno
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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229
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Maeda S, Watanabe Y, Ohno K. Finding important anharmonic terms in the sixth-order potential energy function by the scaled hypersphere search method: An application to vibrational analyses of molecules and clusters. J Chem Phys 2008; 128:144111. [DOI: 10.1063/1.2884348] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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230
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Maeda S, Ohno K. Microsolvation of Hydrogen Sulfide: Exploration of H2S·(H2O)n and SH-·H3O+·(H2O)n-1 (n = 5−7) Cluster Structures on Ab Initio Potential Energy Surfaces by the Scaled Hypersphere Search Method. J Phys Chem A 2008; 112:2962-8. [DOI: 10.1021/jp710494n] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Satoshi Maeda
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Koichi Ohno
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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231
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Maeda S, Ohno K. Automated Exploration of Adsorption Structures of an Organic Molecule on RuH2−BINAP by the ONIOM Method and the Scaled Hypersphere Search Method. J Phys Chem A 2007; 111:13168-71. [DOI: 10.1021/jp709874f] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Satoshi Maeda
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Koichi Ohno
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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232
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Watanabe Y, Maeda S, Ohno K. Global reaction route mapping on potential energy surfaces of C2H7+ and C3H9+. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.09.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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233
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Luo Y, Maeda S, Ohno K. Quantum Chemistry Study of H+(H2O)8: A Global Search for Its Isomers by the Scaled Hypersphere Search Method, and Its Thermal Behavior. J Phys Chem A 2007; 111:10732-7. [PMID: 17887737 DOI: 10.1021/jp074819b] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The structures of the protonated water cluster H+(H2O)8 have been globally explored by the scaled hypersphere search method. On the Hartree-Fock potential energy surface 174 isomers were found, among which 168 were computed to be minima at the B3LYP/6-31+G** level, and their energies were further refined at the level of MP2/6-311++G(3df,2p). The global minimum on the potential energy surface computed at the B3LYP/6-31+G** level shows a cagelike structure with the "Eigen" motif, while the lowest-free-energy isomer has a five-membered-ring structure at 170 K and a chain form at 273 K. The present results are well in line with previous experimental findings. In addition, the ADMP (atom-centered density matrix propagation) simulation indicates that the extra proton in the lowest-free-energy isomer (170 K), which has a five-membered ring and the "Zundel" feature, is often in an asymmetrical hydrogen bond.
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Affiliation(s)
- Yi Luo
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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234
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Hidaka H, Kouchi A, Watanabe N. Temperature, composition, and hydrogen isotope effect in the hydrogenation of CO on amorphous ice surface at 10–20K. J Chem Phys 2007; 126:204707. [PMID: 17552789 DOI: 10.1063/1.2735573] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
An experiment on the addition reaction of a D atom (deuteration) to CO on a cold ice surface is performed by deuterium atom exposure of three types of samples (pure solid CO, CO-capped H2O ice, and CO-H2O mixed ice) at 10-20 K. The variation of IR absorption spectra for the samples was measured by a Fourier transform infrared spectrometer during exposure to deuterium atoms. Reactions on pure solid CO were observed only at 10 K, while reactions on CO-capped H2O ice and CO-H2O mixed ice were observed to proceed even at 20 K. This indicates that the coexistence of H2O at the surface raises the reactive temperature. In addition, the experiment on H atom exposure was also carried out at 15 K to compare the reaction rate constant between the H and D atoms. The ratio of reaction rate constant kD/kH obtained is about 0.08 at 15 K. The authors provide information on the potential energy for the H+CO reaction at the surface by using the ratio kD/kH and by a model calculation of the potential tunneling with the asymmetric Eckart potential.
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Affiliation(s)
- H Hidaka
- Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan
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235
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Yang X, Maeda S, Ohno K. Insight into Global Reaction Mechanism of [C2, H4, O] System from ab Initio Calculations by the Scaled Hypersphere Search Method. J Phys Chem A 2007; 111:5099-110. [PMID: 17506536 DOI: 10.1021/jp071238d] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A detailed computational study is performed on the singlet potential energy surface (PES) for possible isomerization and dissociation reactions of CH(3)CHO at the DFT (B3LYP/6-311++G(d,p)) and CCSD(T)/cc-pVTZ//B3LYP/6-311++G(d,p) levels. The pathways around the equilibrium structures can be discovered by the scaled hypersphere search (SHS) method, which enables us to make a global analysis of the PES for a given chemical composition. Fourteen isomers inclusive of 11 single-molecules and three "non-stabilized" oxygen-based ylides, 5 energetically favored complexes, and 79 interconversion transition states have been found on the singlet PES. Four lowest lying isomers with thermodynamic stability are also kinetically stable with respect to metastable intermediates. It was revealed that vinyl alcohols, which could be generated by the tautomerization of acetaldehyde, could undergo dissociation to form acetylene and water. In addition, recombination channels between some fragments, such as H(2)CO + (1)CH(2) and (1)CHOH + (1)CH(2), are energetically accessible via collision complex or oxygen-based ylides. Most of available unimolecular decompositions are found to be responsible for favorable hydrogen abstraction processes.
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Affiliation(s)
- Xia Yang
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Sendai 980-8578, Japan
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236
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Maeda S, Ohno K. Structures of Water Octamers (H2O)8: Exploration on Ab Initio Potential Energy Surfaces by the Scaled Hypersphere Search Method. J Phys Chem A 2007; 111:4527-34. [PMID: 17461560 DOI: 10.1021/jp070606a] [Citation(s) in RCA: 111] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The potential energy surface (PES) of water octamers has been explored by the scaled hypersphere search method. Among 164 minima on the PES (based on MP2/6-311++G(3df,2p)//B3LYP/6-311+G(d,p) calculations), the cubic structure with D2d symmetry has been confirmed to be the global minimum. In a thermodynamic simulation using these 164 structures, the cubic structure with S4 symmetry has the highest population at low temperature, though double rings can become dominant as temperature going up, in good accord with a recent Monte Carlo simulation using an empirical potential. A transition temperature from cubic to noncubic has significantly been underestimated when potential energy data of B3LYP/6-311+G(d,p) calculations are employed in the simulation. This serious discrepancy between the MP2 and the B3LYP results suggests an importance of dispersion interactions for discussions on thermodynamics of water octamers.
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Affiliation(s)
- Satoshi Maeda
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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237
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Tsujino Y, Wakai C, Matubayasi N, Nakahara M. Intermolecular Proton Transfer from Formaldehyde Intermediate to Anisole in Noncatalytic Pyrolysis: Phenol Produced without Hydrolysis. CHEM LETT 2006. [DOI: 10.1246/cl.2006.1334] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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