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Vogt N, Nair KPR, Grabow JU, Demaison J. Microwave rotational spectrum and ab initio computations on 4-cyanopyridine: molecular structure and hyperfine interactions. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1467053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Natalja Vogt
- Section of Chemical Information Systems, Faculty of Sciences, University of Ulm, Ulm, Germany
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russian Federation
| | - K. P. Rajappan Nair
- Institut für Physikalische Chemie und Elektrochemie, Wilhelm-Gottfried-Leibniz-Universität Hannover, Hannover, Germany
| | - Jens-Uwe Grabow
- Institut für Physikalische Chemie und Elektrochemie, Wilhelm-Gottfried-Leibniz-Universität Hannover, Hannover, Germany
| | - Jean Demaison
- Section of Chemical Information Systems, Faculty of Sciences, University of Ulm, Ulm, Germany
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2
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Demaison J, Craig NC, Gurusinghe R, Tubergen MJ, Rudolph HD, Coudert LH, Szalay PG, Császár AG. Fourier Transform Microwave Spectrum of Propene-3-d 1 (CH 2═CHCH 2D), Quadrupole Coupling Constants of Deuterium, and a Semiexperimental Equilibrium Structure of Propene. J Phys Chem A 2017; 121:3155-3166. [PMID: 28368600 DOI: 10.1021/acs.jpca.7b01470] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The ground-state rotational spectrum of propene-3-d1, CH2═CHCH2D, was measured by Fourier transform microwave spectroscopy. Transitions were assigned for the two conformers, one with the D atom in the symmetry plane (S) and the other with the D atom out of the plane (A). The energy difference between the two conformers was calculated to be 6.5 cm-1, the S conformer having lower energy. The quadrupole hyperfine structure due to deuterium was resolved and analyzed for both conformers. The experimental quadrupole coupling and the centrifugal distortion constants compared favorably to their ab initio counterparts. Ground-state rotational constants for the S conformer are 40582.157(9), 9067.024(1), and 7766.0165(12) MHz. Ground-state rotational constants for the A conformer are 43403.75(3), 8658.961(2), and 7718.247(2) MHz. For the A conformer, a small tunneling splitting (19 MHz) due to internal rotation was observed and analyzed. Using the new rotational constants of this work as well as those previously determined for the 13C species and for some deuterium-substituted species from the literature, a new semiexperimental equilibrium structure was determined and its high accuracy was confirmed. The difficulty in obtaining accurate coordinates for the out-of-plane hydrogen atom is discussed.
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Affiliation(s)
- Jean Demaison
- Section of Chemical Information Systems, University of Ulm , Albert Einstein Allee 47, 89069 Ulm, Germany
| | - Norman C Craig
- Department of Chemistry and Biochemistry, Oberlin College , Oberlin, Ohio 44074, United States
| | - Ranil Gurusinghe
- Department of Chemistry, Kent State University , Kent, Ohio 44242, United States
| | - Michael J Tubergen
- Department of Chemistry, Kent State University , Kent, Ohio 44242, United States
| | - Heinz Dieter Rudolph
- Section of Chemical Information Systems, University of Ulm , Albert Einstein Allee 47, 89069 Ulm, Germany
| | - Laurent H Coudert
- Institut des Sciences Moléculaires d'Orsay, UMR 8214, Bâtiment 210, Université Paris-Sud , 91405 Orsay, France
| | - Péter G Szalay
- Institute of Chemistry, Eötvös Loránd University , Budapest H-1053, Hungary
| | - Attila G Császár
- MTA-ELTE Complex Chemical Systems Research Group , Pázmány Péter sétány 1/A, Budapest H-1117, Hungary
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Vogt N, Demaison J, Krasnoshchekov SV, Stepanov NF, Rudolph HD. Determination of accurate semiexperimental equilibrium structure of proline using efficient transformations of anharmonic force fields among the series of isotopologues. Mol Phys 2017. [DOI: 10.1080/00268976.2017.1292370] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Natalja Vogt
- Section of Chemical Information Systems, Faculty of Sciences, University of Ulm, Ulm, Germany
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Jean Demaison
- Section of Chemical Information Systems, Faculty of Sciences, University of Ulm, Ulm, Germany
| | | | - Nikolay F. Stepanov
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russian Federation
| | - Heinz Dieter Rudolph
- Section of Chemical Information Systems, Faculty of Sciences, University of Ulm, Ulm, Germany
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Juanes M, Vogt N, Demaison J, León I, Lesarri A, Rudolph HD. Axial–equatorial isomerism and semiexperimental equilibrium structures of fluorocyclohexane. Phys Chem Chem Phys 2017; 19:29162-29169. [DOI: 10.1039/c7cp06135h] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Accuracy vs. computational effort: the mixed estimation method provides very accurate semiexperimental equilibrium structures, as illustrated by the subtle differences between axial/equatorial fluorocyclohexane.
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Affiliation(s)
- Marcos Juanes
- Departamento de Química Física y Química Inorgánica
- Facultad de Ciencias
- Universidad de Valladolid
- 47011 Valladolid
- Spain
| | - Natalja Vogt
- Section of Chemical Information Systems
- University of Ulm
- 89081 Ulm
- Germany
- Department of Chemistry
| | - Jean Demaison
- Section of Chemical Information Systems
- University of Ulm
- 89081 Ulm
- Germany
| | - Iker León
- Departamento de Química Física y Química Inorgánica
- Facultad de Ciencias
- Universidad de Valladolid
- 47011 Valladolid
- Spain
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica
- Facultad de Ciencias
- Universidad de Valladolid
- 47011 Valladolid
- Spain
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Kupka T, Buczek A, Broda MA, Stachów M, Tarnowski P. DFT studies on the structural and vibrational properties of polyenes. J Mol Model 2016; 22:101. [PMID: 27048200 PMCID: PMC4821862 DOI: 10.1007/s00894-016-2969-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 03/16/2016] [Indexed: 11/29/2022]
Abstract
Detailed density functional theory (DFT) calculations on the structure and harmonic frequencies of model all-trans and all-cis polyenes were undertaken. For the first time, we report on the convergence of selected B3LYP/6-311++G** and BLYP/6-311++G** calculated structural parameters resulting from a systematic increase in polyene size (chains containing 2 to 14 C = C units). The limiting values of the structural parameters for very long chains were estimated using simple three-parameter empirical formulae. BLYP/6-311++G** calculated ν(C = C) and ν(C-C) frequencies for all-trans and all-cis polyenes containing up to 14 carbon-carbon double bonds were used to estimate these values for very long chains. Correction of raw, unscaled vibrational data was performed by comparing theoretical and experimental wavenumbers for polyenes chains containing 3 to 12 conjugated C = C units with both ends substituted by tert-butyl groups. The corrected ν(C = C) and ν(C-C) wavenumbers for all-trans molecules were used to estimate the presence of 9 - 12 C = C units in all-trans polyene pigment in red coral.
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Affiliation(s)
- Teobald Kupka
- Faculty of Chemistry, University of Opole, 48 Oleska Street, 45-052, Opole, Poland.
| | - Aneta Buczek
- Faculty of Chemistry, University of Opole, 48 Oleska Street, 45-052, Opole, Poland.
| | - Małgorzata A Broda
- Faculty of Chemistry, University of Opole, 48 Oleska Street, 45-052, Opole, Poland
| | - Michał Stachów
- Faculty of Chemistry, University of Opole, 48 Oleska Street, 45-052, Opole, Poland
| | - Przemysław Tarnowski
- Faculty of Chemistry, University of Opole, 48 Oleska Street, 45-052, Opole, Poland
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Buczek A, Kupka T, Broda MA, Żyła A. Predicting the structure and vibrational frequencies of ethylene using harmonic and anharmonic approaches at the Kohn-Sham complete basis set limit. J Mol Model 2016; 22:42. [PMID: 26800989 PMCID: PMC4723629 DOI: 10.1007/s00894-015-2902-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 12/22/2015] [Indexed: 11/25/2022]
Abstract
In this work, regular convergence patterns of the structural, harmonic, and VPT2-calculated anharmonic vibrational parameters of ethylene towards the Kohn–Sham complete basis set (KS CBS) limit are demonstrated for the first time. The performance of the VPT2 scheme implemented using density functional theory (DFT-BLYP and DFT-B3LYP) in combination with two Pople basis sets (6-311++G** and 6-311++G(3df,2pd)), the polarization-consistent basis sets pc-n, aug-pc-n, and pcseg-n (n = 0, 1, 2, 3, 4), and the correlation-consistent basis sets cc-pVXZ and aug-cc-pVXZ (X = D, T, Q, 5, 6) was tested. The BLYP-calculated harmonic frequencies were found to be markedly closer than the B3LYP-calculated harmonic frequencies to the experimentally derived values, while the calculated anharmonic frequencies consistently underestimated the observed wavenumbers. The different basis set families gave very similar estimated values for the CBS parameters. The anharmonic frequencies calculated with B3LYP/aug-pc-3 were consistently significantly higher than those obtained with the pc-3 basis set; applying the aug-pcseg-n basis set family alleviated this problem. Utilization of B3LYP/aug-pcseg-n basis sets instead of B3LYP/aug-cc-pVXZ, which is computationally less expensive, is suggested for medium-sized molecules. Harmonic BLYP/pc-2 calculations produced fairly accurate ethylene frequencies. In this study, the performance of the VPT2 scheme implemented using density functional theory (DFT-BLYP and DFT-B3LYP) in combination with the polarization-consistent basis sets pc-n, aug-pc-n, and pcseg-n (n = 0, 1, 2, 3, 4), and the correlation-consistent basis sets cc-pVXZ and aug-cc-pVXZ (X = D, T, Q, 5, and 6) was tested. For the first time, we demonstrated regular convergence patterns of the structural, harmonic, and VPT2-calculated anharmonic vibrational parameters of ethylene towards the Kohn–Sham complete basis set (KS CBS) limit ![]()
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Affiliation(s)
- Aneta Buczek
- Faculty of Chemistry, University of Opole, 48, Oleska Street, 45-052, Opole, Poland.
| | - Teobald Kupka
- Faculty of Chemistry, University of Opole, 48, Oleska Street, 45-052, Opole, Poland.
| | - Małgorzata A Broda
- Faculty of Chemistry, University of Opole, 48, Oleska Street, 45-052, Opole, Poland
| | - Adriana Żyła
- Faculty of Chemistry, University of Opole, 48, Oleska Street, 45-052, Opole, Poland.,Department of Biosystematics, University of Opole, Oleska 22, 45-052, Opole, Poland.,Institute of Physics, Adam Mickiewicz University in Poznan, 65, Umultowska Street, 61-614, Poznań, Poland
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Vogt N, Demaison J, Cocinero EJ, Écija P, Lesarri A, Rudolph HD, Vogt J. The equilibrium molecular structures of 2-deoxyribose and fructose by the semiexperimental mixed estimation method and coupled-cluster computations. Phys Chem Chem Phys 2016; 18:15555-63. [PMID: 27212641 DOI: 10.1039/c6cp01842d] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mixed estimation method yields very accurate equilibrium structures, as observed in deoxyribose and fructose.
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Affiliation(s)
- Natalja Vogt
- Section of Chemical Information Systems
- Faculty of Sciences
- University of Ulm
- 89069 Ulm
- Germany
| | - Jean Demaison
- Section of Chemical Information Systems
- Faculty of Sciences
- University of Ulm
- 89069 Ulm
- Germany
| | - Emilio J. Cocinero
- Departamento de Química Física
- Facultad de Ciencia y Tecnología
- Universidad del País Vasco (UPV-EHU)
- 48080 Bilbao
- Spain
| | - Patricia Écija
- Departamento de Química Física
- Facultad de Ciencia y Tecnología
- Universidad del País Vasco (UPV-EHU)
- 48080 Bilbao
- Spain
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica
- Facultad de Ciencias
- Universidad de Valladolid
- 47011 Valladolid
- Spain
| | - Heinz Dieter Rudolph
- Section of Chemical Information Systems
- Faculty of Sciences
- University of Ulm
- 89069 Ulm
- Germany
| | - Jürgen Vogt
- Section of Chemical Information Systems
- Faculty of Sciences
- University of Ulm
- 89069 Ulm
- Germany
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Grimme S, Hansen A. A Practicable Real-Space Measure and Visualization of Static Electron-Correlation Effects. Angew Chem Int Ed Engl 2015; 54:12308-13. [DOI: 10.1002/anie.201501887] [Citation(s) in RCA: 136] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Indexed: 11/10/2022]
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Grimme S, Hansen A. Ein praktikables räumliches Maß für Effekte statischer Elektronenkorrelation und deren Visualisierung. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201501887] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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