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Durig JR, Hur SW, Guirgis GA. Infrared and Raman spectra, conformational stability, vibrational assignment and ab initio calculations of methylvinyl silyl chloride. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2003; 59:2449-2471. [PMID: 12963442 DOI: 10.1016/s1386-1425(02)00379-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The infrared spectra (3200-50 cm(-1)) of gaseous and solid and Raman spectra (3200-10 cm(-1)) of the liquid and solid methylvinyl silyl chloride, CH(2)=CHSiH(CH(3))Cl, and the Si-d isotopomer have been recorded. The three expected stable conformers (the three different groups eclipsing the double bond) have been identified in the fluid phase, but it was not possible to obtain an annealed solid with a single conformer. Variable temperature (-105 to -150 degrees C) studies of the infrared spectra of the sample dissolved in liquid krypton has been carried out. From these data the enthalpy differences between the most stable conformer with the hydrogen atom (HE) eclipsing the double bond to that with the chlorine atom (ClE) and the methyl group (ME) eclipsing the double bond have been determined to be 17+/-4 cm(-1) (203+/-48 Jmol(-1)) and 80+/-12 cm(-1) (957+/-144 Jmol(-1)), respectively. However in the liquid state the ME conformer is the most stable form with enthalpy differences of 13+/-4 and 27+/-7 cm(-1) to the HE and ClE rotamers, respectively. It is estimated that there is 39% of the HE conformer, 35% of the ClE conformer, and 26% of the ME conformer present at ambient temperature. A complete vibration assignment is proposed for the HE conformer which is based on infrared band contours and group frequencies, which is supported by normal coordinate calculations utilizing the force constants from ab initio MP2/6-31G(d) calculations. Additionally, several of the fundamentals for the other two conformers have been assigned. The optimal geometries, conformational stabilities, harmonic force fields, infrared intensities, Raman activities, depolarization ratios, and vibrational frequencies are reported for all three conformers from MP2/6-31G(d,p) ab initio calculations with full electron correlation. Optimized geometrical parameters and conformational stabilities have been obtained from MP2/6-311+G(d,p) calculations. At this highest level of calculations, the HE conformer is predicted to be more stable by 62 and 84 cm(-1) than the ME and ClE conformers, respectively. The coefficients from the potential function governing the conformational interchange have been obtained from the MP2/6-31G(d) ab initio calculations. By utilizing the frequency of the SiH stretching mode, the r(0)-H distance has been determined to be 1.481 A for the HE conformer. The ab initio calculated quantities are compared to the experimentally determined values where applicable, as well as to some corresponding results for some similar molecules.
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Affiliation(s)
- James R Durig
- Department of Chemistry, University of Missouri--Kansas City, 5100 Rockhill Road, Kansas City, MO 64110-2499, USA.
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Galabov B, Kenny JP, Schaefer HF, Durig JR. Conformational Stability of 3-Fluoropropene: A Challenging Problem for Both Theory and Experiment. J Phys Chem A 2002. [DOI: 10.1021/jp011851b] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Boris Galabov
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602-2525
| | - Joseph P. Kenny
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602-2525
| | - Henry F. Schaefer
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602-2525
| | - James R. Durig
- Department of Chemistry, University of MissouriKansas City, Kansas City, Missouri 64110-2499
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Shen S, Guirgis GA, Gao J, Durig JR. Infrared and Raman spectra, conformational stability, vibration assignment, and ab initio calculations for 3-bromo-3,3-difluoropropene. J Mol Struct 2001. [DOI: 10.1016/s0022-2860(01)00636-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Chamorro E, Santos JC, Gómez B, Contreras R, Fuentealba P. Topological analysis of the electron localization function applied to the study of the [1,3] sigmatropic shift of fluorine in 3-fluorpropene. J Chem Phys 2001. [DOI: 10.1063/1.1328397] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Raman and infrared spectra, conformational stability, normal coordinate analysis, vibrational assignment, and ab initio calculations of trans -3-pentenenitrile. J Mol Struct 2000. [DOI: 10.1016/s0022-2860(00)00574-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Conformational stability from temperature dependent FT-IR spectra of liquid rare gas solutions, barriers to internal rotation, vibrational assignment, structural parameters and ab initio calculations for 3-bromopropene. J Mol Struct 2000. [DOI: 10.1016/s0022-2860(00)00508-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Kolandaivel P, Jayakumar N. Structure and conformational stability of CH2CHCH2X (X=F, Cl and Br) molecules—post Hartree–Fock and density functional theory methods. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0166-1280(99)00396-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Lin AC, Salpietro SJ, Deretey E, Csizmadia IG. Multidimensional conformational analysis of allyl methyl disulfide: a key component of garlic. CAN J CHEM 2000. [DOI: 10.1139/v00-020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Organosulfur compounds in garlic, like allyl methyl disulfide, have been found to be involved in antimutagenic, anticarcinogenic, antithrombotic, and lipid-lowering activities, and it has also been found to act as an antioxidant. Ab initio molecular computations were performed on dihydrogen disulfide (1) with respect to torsional angle τ1 = τ(H·S-S·H), hydrogen methyl disulfide (2) with respect to torsional angle τ1 = τ(H·S-S·CH3), and allyl methyl disulfide (3) with respect to torsional angles τ1 = τ(H3C2·CH2·S-S·CH3), τ2 = τ(H3C2·CH2-S·S·CH3), and τ3 = τ(H3C2-CH2·S·S·CH3). Potential energy curves (PEC) were obtained from 1 and 2, i.e., E = E(τ1), from which optimized structures were obtained at the HF/6-31G* level of theory. These optimized structures were used to investigate the potential energy hypersurface surface (PEHS) of 3, i.e., E = E(τ1,τ2,τ3). One-dimensional scans along τ2 and τ3 (where τ1 = ±90°; τ1 = 180°) were performed at the HF/3-21G* level of theory. From these scans, six lower energy pairs of enantiomeric minima (i.e., [g+g+g+| g-g-g-], [g+ag- | g-ag+], [g+g-g+ | g-g+g-], [g+g+g-| g-g-g+], [g+ag- | g-ag+], and [g+g-g-| g-g+g+]) as well as 3 higher energy minima (i.e., [g+g+s | g-g-s], [g+as | g-as], and [g+g-s | g-g+s]) were optimized at τ1 = ±90° at the HF/6-31G* and B3LYP/6-31G* levels of theory. The global minimum was determined to be the [g+g-g+ | g-g+g-] enantiomeric pair of conformers, and the fully symmetrical anti-anti-anti [a a a] structure was determined to be a second-order saddle point on the PEHS of 3. Although there are no stereocentres in 3, there is chirality in the conformational twist with respect to the [a a a] conformation through τ1 = τ2 = τ3 = 180°. Based on the energies and MO diagrams of the HUMO and LUMO +1 of 3, the anticarcinogenic and cholesterol lowering activity mechanism of 3 is presented.Key words: ab initio MO computations, allyl methyl disulfide, multidimensional conformational analysis (MDCA), anticarcinogenic, cholesterol lowering.
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Durig JR, Yu Z, Guirgis GA. Raman and Infrared Spectra, Conformational Stability, Barriers To Internal Rotation, Normal Coordinate Analysis, Vibrational Assignment, and ab Initio Calculations of 3,3-Difluoropropene. J Phys Chem A 2000. [DOI: 10.1021/jp992560u] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- James R. Durig
- Department of Chemistry, University of Missouri-Kansas City, Kansas City, Missouri 64110-2499
| | - Zhenhong Yu
- Department of Chemistry, University of Missouri-Kansas City, Kansas City, Missouri 64110-2499
| | - Gamil A. Guirgis
- Department of Chemistry, University of Missouri-Kansas City, Kansas City, Missouri 64110-2499
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Durig JR, Durig DT, van der Veken BJ, Herrebout WA. Conformational Stability from Temperature-Dependent FT-IR Spectra of Liquid Rare Gas Solutions, Barriers To Internal Rotation, Vibrational Assignment, and Ab Initio Calculations for 3-Chloropropene. J Phys Chem A 1999. [DOI: 10.1021/jp990831v] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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van der Veken BJ, Herrebout WA, Durig DT, Zhao W, Durig JR. Conformational Stability of 3-Fluoropropene in Rare Gas Solutions from Temperature-Dependent FT-IR Spectra and ab Initio Calculations. J Phys Chem A 1999. [DOI: 10.1021/jp9835162] [Citation(s) in RCA: 129] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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McWhorter DA, Pate BH. Intramolecular Vibrational Dynamics of the Asymmetric &dbond;CH2 Hydride Stretch of Isobutene. JOURNAL OF MOLECULAR SPECTROSCOPY 1999; 193:159-165. [PMID: 9878496 DOI: 10.1006/jmsp.1998.7733] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The eigenstate-resolved, high-resolution (5 MHz) infrared spectrum of the asymmetric &dbond;CH2 hydride stretch of isobutene has been measured using an electric resonance optothermal spectrometer (EROS). This vibrational band near 3087 cm-1 was rotationally assigned with ground state microwave-infrared double-resonance spectroscopy. IVR rates from rotationally homogeneous IVR multiplets at values of total angular momentum, J ranging from J = 0 to J = 3 and Ka values of Ka = 0 to Ka = 2, were obtained. The average IVR lifetime for this vibrational mode is 105 ps and independent of rotational state. The experimental state density of the rotationless 000 vibrational state, approximately 150 states/cm-1, is in good agreement with the direct count result of 99 states/cm-1 using the C+3 v multiply sign in circle C-3 v (G36) molecular symmetry group. The lineshape profiles of the IVR multiplets are investigated in order to elucidate information concerning the dependence of IVR rates on the symmetry of the torsional wavefunction. We find that there is a common IVR rate among the various torsional symmetries. IVR lifetimes observed in the present study are compared to other asymmetric ethylenic hydride stretch IVR rates measured in our laboratory. Copyright 1999 Academic Press.
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Affiliation(s)
- DA McWhorter
- Department of Chemistry, University of Virginia, McCormick Road, Charlottesville, Virginia, 22902
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McWhorter DA, Pate BH. Conformational Dependence of Intramolecular Vibrational Energy Redistribution in the EthylenicCH2 Stretch Fundamental of Allyl Fluoride. J Phys Chem A 1998. [DOI: 10.1021/jp982609g] [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)
- David A. McWhorter
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22901
| | - Brooks H. Pate
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22901
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McWhorter DA, Pate BH. Elucidating Intramolecular Vibrational Coupling Mechanisms by Microwave Spectroscopy of Single Vibrationally Mixed Quantum States: Coriolis and Conformer Interactions in Allyl Fluoride. J Phys Chem A 1998. [DOI: 10.1021/jp982610f] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- David A. McWhorter
- Department of Chemistry, University of Virginia, McCormick Road, Charlottesville, Virginia 22901
| | - Brooks H. Pate
- Department of Chemistry, University of Virginia, McCormick Road, Charlottesville, Virginia 22901
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Spectra and structure of silicon containing compounds. XXII. Raman and infrared spectra, conformational stability, vibrational assignment and ab initio calculations of methylvinyldichlorosilane. J Mol Struct 1996. [DOI: 10.1016/0022-2860(96)09257-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Durig DT, Herrebout WA, Qiu HZ, Zhen M, Durig JR. Raman and infrared spectra, conformational stability, and ab initio calculations oftrans-1-fluoro-2-butene. Struct Chem 1996. [DOI: 10.1007/bf02275446] [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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Durig J, Costner T, Wang A, Frierson G, Durig D. Raman and infrared spectra, conformational stability, barriers to internal rotation, vibrational assignment and ab initio calculations of trans-1-chloro-2-butene. J Mol Struct 1993. [DOI: 10.1016/0022-2860(93)87023-3] [Citation(s) in RCA: 5] [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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Durig D, Little T, Costner T, Guirgis G, Durig J. Raman and far infrared spectra and conformational analysis of some dichloropropenes. J Mol Struct 1993. [DOI: 10.1016/0022-2860(93)80006-h] [Citation(s) in RCA: 3] [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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Durig DT, Guirgis GA, Durig JR. Far infrared spectrum, conformational stability, barriers to internal rotation, vibrational assignment, and ab initio calculations of 2-chloro-3-fluoropropene. Struct Chem 1992. [DOI: 10.1007/bf00678558] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Durig J, Tang Q, Little T. Low frequency vibrational spectra, barrier to internal rotation, and RHF/STO-3G* ab initio calculations of 3-bromopropene. J Mol Struct 1992. [DOI: 10.1016/0022-2860(92)85002-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Conformational stability and structural parameters of 3-fluoropropene and some substituted derivatives. J Mol Struct 1992. [DOI: 10.1016/0022-2860(92)80079-w] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Luppi J, Räsänen M, Murto J, Pajunen P. Torsional spectrum for asymmetric rotors via phase integral calculation from high level ab initio data: application to 3-fluoropropene. J Mol Struct 1991. [DOI: 10.1016/0022-2860(91)87105-q] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Nieminen J, Murto J, Räsänen M. Matrix isolation infrared and ab initio studies on conformers of 3-fluoropropene. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/0584-8539(91)80243-c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sullivan J, Qtaitat M, Durig J. Conformational analysis and structural determinations from ab initio calculations for vinyl silyl chloride. ACTA ACUST UNITED AC 1989. [DOI: 10.1016/0166-1280(89)87013-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Durig JR, Guirgis GA, Little TS, Stiefvater OL. Conformational stability and barriers to internal rotation of 2‐methylpropanal by far infrared and microwave spectroscopy. J Chem Phys 1989. [DOI: 10.1063/1.457126] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Conformational analysis from low-frequency vibrational data and ab initio calculations for 3-chloropropene. J Mol Struct 1989. [DOI: 10.1016/0022-2860(89)80085-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Little T, Qiu J, Durig J. Asymmetric torsional potential function and conformational analysis of furfural by far infrared and Raman spectroscopy. ACTA ACUST UNITED AC 1989. [DOI: 10.1016/0584-8539(89)80215-6] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Durig JR, Johnson RD, Nanaie H, Hizer TJ. Spectra and structure of organophosphorus compounds. XXXIII. Microwave, infrared, and Raman spectra, structure, conformational stability, and vibrational assignment for ethylphosphonothioic difluoride. J Chem Phys 1988. [DOI: 10.1063/1.454343] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Durig J, Geyer T, Little T, Durig D. Vibrational assignment and conformational equilibrium for 3-fluoropropene based on ab initio calculations and high resolution far-infrared spectroscopy. J Mol Struct 1988. [DOI: 10.1016/0022-2860(88)87015-7] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Durig J, Groner P, Sullivan J. Changes in structural parameters with conformational changes and the determination of conformational stabilities by molecular spectroscopic techniques. J Mol Struct 1988. [DOI: 10.1016/0022-2860(88)80039-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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31
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Conformational identification and dipole moment of 4-fluoro-1-butene by microwave spectroscopy. J Mol Struct 1987. [DOI: 10.1016/0022-2860(87)87061-8] [Citation(s) in RCA: 8] [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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Stavnebrekk PJ, Stølevik R. Molecular mechanics calculations for conformational energies and torional force constants in fluoro propenes and butenes. J Mol Struct 1987. [DOI: 10.1016/0022-2860(87)85081-0] [Citation(s) in RCA: 5] [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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Stavnebrekk PJ, Helene Schei S, Stølevik R. Conformation and molecular structure of trans-1-chloro-2-butene as determined by gas phase electron diffraction. J Mol Struct 1987. [DOI: 10.1016/0022-2860(87)85043-3] [Citation(s) in RCA: 3] [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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van der Veken BJ, Coppens P, Johnson RD, Durig JR. Spectra and structure of organophosphorus compounds. XXIV. Microwave, infrared, and Raman spectra, conformational stability, and vibrational assignment for chloromethylphosphonic difluoride. J Chem Phys 1985. [DOI: 10.1063/1.449388] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Durig J, Bist H, Furic K, Qiu J, Little T. Far infrared spectra and barriers to internal rotation of benzaldehyde, benzoyl fluoride, benzoyl chloride and acetophenone. J Mol Struct 1985. [DOI: 10.1016/0022-2860(85)80191-5] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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