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Stylianakis I, Zervos N, Lii JH, Pantazis DA, Kolocouris A. Conformational energies of reference organic molecules: benchmarking of common efficient computational methods against coupled cluster theory. J Comput Aided Mol Des 2023; 37:607-656. [PMID: 37597063 PMCID: PMC10618395 DOI: 10.1007/s10822-023-00513-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 06/03/2023] [Indexed: 08/21/2023]
Abstract
We selected 145 reference organic molecules that include model fragments used in computer-aided drug design. We calculated 158 conformational energies and barriers using force fields, with wide applicability in commercial and free softwares and extensive application on the calculation of conformational energies of organic molecules, e.g. the UFF and DREIDING force fields, the Allinger's force fields MM3-96, MM3-00, MM4-8, the MM2-91 clones MMX and MM+, the MMFF94 force field, MM4, ab initio Hartree-Fock (HF) theory with different basis sets, the standard density functional theory B3LYP, the second-order post-HF MP2 theory and the Domain-based Local Pair Natural Orbital Coupled Cluster DLPNO-CCSD(T) theory, with the latter used for accurate reference values. The data set of the organic molecules includes hydrocarbons, haloalkanes, conjugated compounds, and oxygen-, nitrogen-, phosphorus- and sulphur-containing compounds. We reviewed in detail the conformational aspects of these model organic molecules providing the current understanding of the steric and electronic factors that determine the stability of low energy conformers and the literature including previous experimental observations and calculated findings. While progress on the computer hardware allows the calculations of thousands of conformations for later use in drug design projects, this study is an update from previous classical studies that used, as reference values, experimental ones using a variety of methods and different environments. The lowest mean error against the DLPNO-CCSD(T) reference was calculated for MP2 (0.35 kcal mol-1), followed by B3LYP (0.69 kcal mol-1) and the HF theories (0.81-1.0 kcal mol-1). As regards the force fields, the lowest errors were observed for the Allinger's force fields MM3-00 (1.28 kcal mol-1), ΜΜ3-96 (1.40 kcal mol-1) and the Halgren's MMFF94 force field (1.30 kcal mol-1) and then for the MM2-91 clones MMX (1.77 kcal mol-1) and MM+ (2.01 kcal mol-1) and MM4 (2.05 kcal mol-1). The DREIDING (3.63 kcal mol-1) and UFF (3.77 kcal mol-1) force fields have the lowest performance. These model organic molecules we used are often present as fragments in drug-like molecules. The values calculated using DLPNO-CCSD(T) make up a valuable data set for further comparisons and for improved force field parameterization.
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Affiliation(s)
- Ioannis Stylianakis
- Department of Medicinal Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimioupolis Zografou, 15771, Athens, Greece
| | - Nikolaos Zervos
- Department of Medicinal Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimioupolis Zografou, 15771, Athens, Greece
| | - Jenn-Huei Lii
- Department of Chemistry, National Changhua University of Education, Changhua City, Taiwan
| | - Dimitrios A Pantazis
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany
| | - Antonios Kolocouris
- Department of Medicinal Chemistry, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimioupolis Zografou, 15771, Athens, Greece.
- Laboratory of Medicinal Chemistry, Section of Pharmaceutical Chemistry, Department of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis-Zografou, 15771, Athens, Greece.
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Maris A, Melandri S, Evangelisti L, Vigorito A, Sigismondi S, Calabrese C, Usabiaga I. Structure and dynamics of methacrylamide, a computational and free-jet rotational spectroscopic study. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131391] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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3
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Ahn YH, Youn Y, Cha M, Lee H. Spectroscopic and thermodynamic investigations of clathrate hydrates of methacrolein. RSC Adv 2017. [DOI: 10.1039/c6ra28434e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
This study characterized new structure II (sII) clathrate hydrates, consisting of 136 H2O molecules with 8 large 51264 cages and 16 small 512 cages, with methacrolein for the first time.
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Affiliation(s)
- Yun-Ho Ahn
- Department of Chemical and Biomolecular Engineering (BK21+ Program)
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 305-701
- Republic of Korea
| | - Yeobum Youn
- Department of Chemical and Biomolecular Engineering (BK21+ Program)
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 305-701
- Republic of Korea
| | - Minjun Cha
- Department of Energy and Resources Engineering
- Kangwon National University
- Chuncheon-si
- Republic of Korea
| | - Huen Lee
- Department of Chemical and Biomolecular Engineering (BK21+ Program)
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 305-701
- Republic of Korea
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Koroleva LA, Krasnoshchekov SV, Matveev VK, Pentin YA. Potential function of the internal rotation of a methacrolein molecule in the ground (S 0) electronic state. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2016. [DOI: 10.1134/s0036024416080124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Zakharenko O, Motiyenko RA, Aviles Moreno JR, Jabri A, Kleiner I, Huet TR. Torsion-rotation-vibration effects in the ground and first excited states of methacrolein, a major atmospheric oxidation product of isoprene. J Chem Phys 2016; 144:024303. [DOI: 10.1063/1.4939636] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- O. Zakharenko
- Laboratoire de Physique des Lasers, Atomes et Molécules, UMR8523 CNRS – Université Lille 1, Bâtiment P5, F- 59655 Villeneuve d’Ascq Cedex, France
| | - R. A. Motiyenko
- Laboratoire de Physique des Lasers, Atomes et Molécules, UMR8523 CNRS – Université Lille 1, Bâtiment P5, F- 59655 Villeneuve d’Ascq Cedex, France
| | - J.-R. Aviles Moreno
- Laboratoire de Physique des Lasers, Atomes et Molécules, UMR8523 CNRS – Université Lille 1, Bâtiment P5, F- 59655 Villeneuve d’Ascq Cedex, France
| | - A. Jabri
- Laboratoire Inter-universitaire des Systèmes Atmosphériques, CNRS - Universités Paris Est Créteil et Paris Diderot, 61 Avenue du Général de Gaulle, 94010 Créteil Cedex, France
- Institute for Physical Chemistry, RWTH Aachen University, Aachen, Germany
| | - I. Kleiner
- Laboratoire Inter-universitaire des Systèmes Atmosphériques, CNRS - Universités Paris Est Créteil et Paris Diderot, 61 Avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - T. R. Huet
- Laboratoire de Physique des Lasers, Atomes et Molécules, UMR8523 CNRS – Université Lille 1, Bâtiment P5, F- 59655 Villeneuve d’Ascq Cedex, France
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6
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Measurement, Interpretation and Use of Free Ligand Solution Conformations in Drug Discovery. PROGRESS IN MEDICINAL CHEMISTRY 2016; 55:45-147. [DOI: 10.1016/bs.pmch.2015.10.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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7
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Koroleva LA, Tyulin VI, Matveev VK, Pentin YA. Analysis of the vibrational structure of the n-π* transition in the high-resolution UV absorption spectrum of methacrolein vapor. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2015. [DOI: 10.1134/s0036024415070195] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Sun C, Xu B, Zhang S. Atmospheric Reaction of Cl + Methacrolein: A Theoretical Study on the Mechanism, and Pressure- and Temperature-Dependent Rate Constants. J Phys Chem A 2014; 118:3541-51. [DOI: 10.1021/jp500993k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Cuihong Sun
- School
of Chemistry, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
- College
of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, People’s Republic of China
| | - Baoen Xu
- College
of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, People’s Republic of China
| | - Shaowen Zhang
- School
of Chemistry, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
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El-Taher S. Theoretical investigation of the oxidation pathways of HO•-initiated reactions of acrolein, methacrolein, and trans-crotonaldehyde. CAN J CHEM 2009. [DOI: 10.1139/v09-142] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Ab initio molecular-orbital calculations have been performed to investigate the reaction mechanisms of the HO•-initiated reactions of the α,β-unsaturated aldehydes: acrolein (ACR), methacrolein (MACR), and trans-crotonaldehyde (CROT). All geometries were fully optimized at the MP2(Full)/6–31G(d,p) level. The correlation energy corrections were introduced by carrying out single-point calculations using both spin-projected second-order Møller–Plesset perturbation theory (PMP2) and coupled-cluster theory (CCSD(T)) using basis sets of different sizes. All reaction pathways studied proceed via a barrierless formation of a loosely bound pre-reactive complex in the entrance channel. The transition-state structures of the HO• additions to the terminal (β) and to the central (α) carbon atoms of the C=C double bond are found to be reactant-like structures. The lowest-energy barrier pathways are found to be the aldehydic H-atom abstraction. The β-addition pathways are found to be energetically more favored than the α-addition pathways. The HO• addition and aldehydic H-atom abstraction pathways are found to be highly exoergic, with the H-atom abstraction pathway being more exoergic than the addition pathways. Although the methyl substitution at the C=C double bond of methacrolein and crotonaldehyde lowers the energies of the transition-state structures of both α- and β-addition pathways, it destabilizes the energies of the transition-state structures of the corresponding aldehydic H-atom abstraction pathways, compared with that of acrolein.
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Affiliation(s)
- Sabry El-Taher
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt. (e-mail: )
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Bokareva O, Bataev V, Godunov I. Structures and conformational dynamics of monomethylated derivatives of acrolein: A quantum-chemical study. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.theochem.2009.08.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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11
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Gróf M, Gatial A, Milata V, Prónayová N, Sümmchen L, Salzer R. Conformational studies of 3-aminomethylene-2,4-pentanedione using vibrational and NMR spectra, and ab initio calculations. J Mol Struct 2007. [DOI: 10.1016/j.molstruc.2006.12.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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12
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Ochando-Pardo M, Nebot-Gil I, González-Lafont A, Lluch JM. Methyl Vinyl Ketone+OH and Methacrolein+OH Oxidation Reactions: A Master Equation Analysis of the Pressure- and Temperature-Dependent Rate Constants. Chemistry 2007; 13:1180-90. [PMID: 17066494 DOI: 10.1002/chem.200600529] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
High-level electronic structure calculations and master equation analyses were carried out to obtain the pressure- and temperature-dependent rate constants of the methyl vinyl ketone+OH and methacrolein+OH reactions. The balance between the OH addition reactions at the high-pressure limit, the OH addition reactions in the fall-off region, and the pressure-independent hydrogen abstractions involved in these multiwell and multichannel systems, has been shown to be crucial to understand the pressure and temperature dependence of each global reaction. In particular, the fall-off region of the OH addition reactions contributes to the inverse temperature dependence of the rate constants in the Arrhenius plots, leading to pressure-dependent negative activation energies. The pressure dependence of the methyl vinyl ketone+OH reaction is clearly more important than in the case of the methacrolein+OH reaction owing to the weight of the hydrogen abstraction process in this second system. Comparison of the theoretical rate constants and the experimental measurements shows quite good agreement.
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Polovková J, Gatial A, Milata V, Černuchová P, Prónayová N, Liptaj T, Matĕjka P. Vibrational analysis and conformational study of 3-dimethylamino-2-acetyl propenenitrile and 3-dimethylamino-2-methylsulfonyl propenenitrile. J Mol Struct 2006. [DOI: 10.1016/j.molstruc.2005.09.028] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Ochando-Pardo M, Nebot-Gil I, González-Lafont A, Lluch JM. Pressure dependence in the methyl vinyl ketone + OH and methacrolein + OH oxidation reactions: an electronic structure study. Chemphyschem 2005; 6:1567-73. [PMID: 16025561 DOI: 10.1002/cphc.200500115] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
High-level electronic structure calculations were carried out for the study of the reaction pathways in the OH-initiated oxidations of methyl vinyl ketone (MVK) and methacrolein (MACR). For the two conformers of MVK (called synperiplanar and antiperiplanar), the addition channels of OH to the terminal and central carbon atom of the double bond dominate the overall rate constant, whereas the abstraction of the methyl hydrogen atoms has no significant kinetic role. In the case of MACR, only the antiperiplanar conformer is important in its reactivity. In addition, the lower Gibbs free energy barrier for MACR corresponds to the aldehydic hydrogen abstraction reaction, which will be somewhat more favorable than the addition processes. The subtle balance between the different pathways (additions versus abstractions) serves to give an understanding of the pressure dependence of the rate constants of these tropospheric oxidation processes.
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Affiliation(s)
- Montserrat Ochando-Pardo
- Departament de Química Física and Institut de Ciència Molecular, Universitat de València, 46100 Burjassot, Spain
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Ochando-Pardo M, Nebot-Gil I, González-Lafont À, Lluch JM. Enthalpies of formation of isoprene’s major oxidation byproducts. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.04.105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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16
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Sharma A, Gupta VP, Virdi A. Conformational stability, optimized geometries, vibrational and electronic spectra of methacryloyl bromide in ground and excited electronic states. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2004; 60:311-320. [PMID: 14670493 DOI: 10.1016/s1386-1425(03)00254-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In order to understand conformational isomerism in methacryloyl bromide (MABR) in the ground (S(0)) and the first excited (S(1)) electronic states and to interpret the vibrational and electronic spectra of its conformers in the S(0) state, quantum mechanical calculations using Density Functional Theory (DFT) and RHF methods with extended basis sets 6-31G, 6-31G** and 6-311+G(d,p) have been conducted. In RHF calculations, electron correlation effects have been included at the Møller-Plesset MP2 level. It is inferred that in both the electronic states the molecule may exist in two isomeric forms-s-trans and s-cis; the former being more stable than the later by about 1.629 kcal mol(-1) in the S(0) state and by about 2.218 kcal mol(-1) in the S(1) state. Electronic transition tends to increase the s-trans/s-cis and s-cis/s-trans, rotational barriers from 7.059 kcal mol(-1) (2468.1 cm(-1)) and 5.428 kcal mol(-1) (1897.8 cm(-1)) in S(0) state to 23.594 kcal mol(-1) (8249.4 cm(-1)) and 21.376 kcal mol(-1) (7473.9 cm(-1)) in the S(1) state. Completely optimized geometries of the two conformers in S(0) state reveal that while there is no significant difference in their bond lengths, some of the bond angles associated with COBr group are appreciably different. Electronic excitation tends to change both the bond lengths and bond angles. Based on suitably scaled DFT and RHF results obtained from the use of 6-31G** and 6-311+G(d,p) basis sets, a complete assignment is provided to the fundamental vibrational bands of both the s-trans and s-cis conformers in terms of frequency, form and intensity of vibrations and potential distribution across the symmetry coordinates in the S(0) state and a comparison has been made with experimental assignments. A theoretical prediction of the electronic transitions in the near UV-region in the two conformers and their tentative assignment has been provided on the basis of CI level calculations using 6-31G basis set.
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Affiliation(s)
- Archna Sharma
- Department of Physics, University of Jammu, Jammu 180006, India
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17
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Ab initio investigations of structural and energetic properties of hindered aryl alkyl ketones. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0166-1280(02)00657-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Sakaizumi T, Harima D, Usami T, Togashi M, Yamamoto K, Kuze N, Ohashi O. Microwave spectrum, molecular structure, barrier to internal rotation of methyl group, and ab initio MO calculation of 1-chloro-2-nitrosopropene, syn-ClCHC(CH3)–NO. J Mol Struct 2002. [DOI: 10.1016/s0022-2860(02)00085-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sakaizumi T, Imajo H, Yamasaki R, Usami T, Kawaji S, Abe S, Haraga T, Morii H, Kuze N, Ohashi O. Generation, Microwave Spectrum, Barrier to Internal Rotation of Methyl Group, and ab Initio MO Calculation of syn-2-Nitrosopropene, syn-CH(2)&dbond;C(CH(3))&bond;N&dbond;O. JOURNAL OF MOLECULAR SPECTROSCOPY 2000; 204:26-35. [PMID: 11034839 DOI: 10.1006/jmsp.2000.8183] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
syn-2-Nitrosopropene was generated, in the gas phase, by chemical reaction of 1-chloro-2-(hydroxyimino)propane with K(2)CO(3) and identified by microwave spectroscopy. The microwave spectrum of the reaction product was observed in the frequency range from 8.0 to 40.0 GHz. The rotational constants (MHz) were determined as A = 8744.09(6), B = 4846.07(2), and C = 3177.84(3) for CH(2)&dbond;C(CH(3))&bond;(14)NO (normal species) and A = 8664.36(5), B = 4822.15(3), and C = 3157.04(3) for CH(2)&dbond;C(CH(3))&bond;(15)NO ((15)N species) in the ground vibrational state. The values of the planar moment (P(cc) = (I(a) + I(b) - I(c))/2) obtained for the normal and (15)N species were 1.525(1) and 1.526(1) u Å(2), respectively. This suggests that the nitrogen atom lies in or is close to the ab inertial plane of the molecule and shows also that only two hydrogen atoms are located symmetrically out of the symmetry plane. The reaction product was determined to be syn-2-nitrosopropene by comparing the observed and calculated rotational constants, kappa (Ray's asymmetry parameter) and r(s) coordinates of the nitrogen atom. The dipole moments (D) were determined to be µ(a) = 2.43(5), µ(b) = 1.12(7), and µ(total) = 2.67(7). The barrier heights of the internal rotation owing to the methyl group of the normal species in the ground and first excited torsional states were determined to be 1750(50) and 1740(50) cal/mol (1 cal/mol = 4.184 J/mol), respectively. The (14)N nuclear quadrupole coupling constants (MHz) were determined to be chi(aa) = 0.25(21), chi(bb) = -7.11(40), and chi(cc) = 6.85(61). Two vibrational excited states were observed and the vibrational frequencies (cm(-1)) of the C-N and C-C torsional modes were determined to be 160(40) and 175(40), respectively. The lifetime of syn-2-nitrosopropene was found to be ca. 2 min in the waveguide cell. Copyright 2000 Academic Press.
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Affiliation(s)
- T Sakaizumi
- Department of Chemistry, Faculty of Science and Technology, Sophia University, 7-1, Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan
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20
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An investigation of structural stability and analysis of vibrational spectra of formyl ketene based on ab initio calculations. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0166-1280(99)00331-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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21
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The SPASIBA force field of aldehydes. Part II: structure and vibrational wavenumbers of ethandial, propenal and 2-methylpropenal. J Mol Struct 1999. [DOI: 10.1016/s0022-2860(98)00552-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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22
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Khabashesku VN, Boganov SE, Kudin KN, Margrave JL, Nefedov OM. Vacuum Pyrolysis−Matrix Isolation FTIR and Density Functional Theoretical Studies of Transient Dimethylgermanone, (CH3)2GeO. Organometallics 1998. [DOI: 10.1021/om9806803] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Valery N. Khabashesku
- Department of Chemistry, Rice University, Houston, Texas 77005-1892, and the Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leniskii prospekt, Moscow 117913, Russian Federation
| | - Sergei E. Boganov
- Department of Chemistry, Rice University, Houston, Texas 77005-1892, and the Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leniskii prospekt, Moscow 117913, Russian Federation
| | - Konstantin N. Kudin
- Department of Chemistry, Rice University, Houston, Texas 77005-1892, and the Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leniskii prospekt, Moscow 117913, Russian Federation
| | - John L. Margrave
- Department of Chemistry, Rice University, Houston, Texas 77005-1892, and the Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leniskii prospekt, Moscow 117913, Russian Federation
| | - Oleg M. Nefedov
- Department of Chemistry, Rice University, Houston, Texas 77005-1892, and the Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leniskii prospekt, Moscow 117913, Russian Federation
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Ab initio study of the effect of solvent on energies and rotational barriers in 2,3-butadienal and 2,3-butadienoyl fluoride and chloride. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0166-1280(97)00288-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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24
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Shishkov IF, Vilkov LV, Khristenko LV, Skancke PN. The molecular structure of 2-chloroacrolein studied by gas electron diffraction, vibrational spectroscopy and ab initio MO calculations. J Mol Struct 1996. [DOI: 10.1016/0022-2860(95)09097-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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García J, Mayoral J, Salvatella L, Assfeld X, Ruiz-López MF. On the conformational preferences of α,β-unsaturated carbonyl compounds. An ab initio study. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/0166-1280(95)04391-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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26
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Bao J, Wulff WD. A comparison of Diels-Alder catalysts generated from linear and vaulted biaryls and bromoborane-dimethylsulfide complex. Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)00534-j] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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27
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Experimental structural and conformational studies of carbonyl molecules in the ground and lower excited states. J STRUCT CHEM+ 1995. [DOI: 10.1007/bf02578062] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Wang Y, De Smedt J, Coucke I, Van Alsenoy C, Geise H. Methacrolein in the gas phase, investigated by electron diffraction, microwave and vibrational spectroscopy, supplemented with ab initio calculations of geometries and force fields. J Mol Struct 1993. [DOI: 10.1016/0022-2860(93)80282-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
29
|
Conformational stability, barriers to internal rotation, structural parameters, ab initio calculations, and vibrational assignment of cyclopropanecarboxaldehyde. Struct Chem 1992. [DOI: 10.1007/bf00672016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
30
|
The structure of the 2-methylacrolein boron trifluoride complex in the crystalline phase and in solution. Tetrahedron Lett 1992. [DOI: 10.1016/s0040-4039(00)60902-4] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
31
|
Durig J, Brletic P, Li Y, Wang AY, Little T. Rotational and vibrational spectra, conformational stability, potential functions and ab initio calculations of methacryloyl chloride. J Mol Struct 1990. [DOI: 10.1016/0022-2860(90)80475-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
32
|
Internal rotation in halogen derivatives XHCC(CH3)CYO of 2-methylpropenal obtained by molecular mechanics calculations. J Mol Struct 1990. [DOI: 10.1016/0022-2860(90)85050-s] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
33
|
Infrared and raman spectra, vibrational assignment, and conformational stability of methacryloyl bromide. J Mol Struct 1989. [DOI: 10.1016/0022-2860(89)85077-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
34
|
Fabian WMF. AM1 calculations of rotation around essential single bonds and preferred conformations in conjugated molecules. J Comput Chem 1988. [DOI: 10.1002/jcc.540090412] [Citation(s) in RCA: 86] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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