1
|
The Spectroscopic Characterization of Halogenated Pollutants through the Interplay between Theory and Experiment: Application to R1122. Molecules 2022; 27:molecules27030748. [PMID: 35164013 PMCID: PMC8839295 DOI: 10.3390/molecules27030748] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Revised: 01/13/2022] [Accepted: 01/18/2022] [Indexed: 01/30/2023] Open
Abstract
In the last decade, halogenated ethenes have seen an increasing interest for different applications; in particular, in refrigeration, air-conditioning and heat pumping. At the same time, their adverse effects as atmospheric pollutants require environmental monitoring, especially by remote sensing spectroscopic techniques. For this purpose, an accurate characterization of the spectroscopic fingerprint—in particular, those of relevance for rotational–vibrational spectroscopy—of the target molecules is strongly needed. This work provides an integrated computational–theoretical investigation on R1122 (2-Chloro-1,1-difluoro-ethylene, ClHC=CF2), a compound widely employed as a key intermediate in different chemical processes. State-of-the-art quantum chemical calculations relying on CCSD(T)-based composite schemes and hybrid CCSD(T)/DFT approaches are used to obtain an accurate prediction of the structural, rotational and vibrational spectroscopic properties. In addition, the equilibrium geometry is obtained by exploiting the semi-experimental method. The theoretical predictions are used to guide the analysis of the experimentally recorded gas-phase infrared spectrum, which is assigned in the 400–6500 cm−1 region. Furthermore, absorption cross sections are accurately determined over the same spectral range. Finally, by using the obtained spectroscopic data, a first estimate of the global warming potential of R1122 vibrational spectra is obtained.
Collapse
|
2
|
Ceselin G, Barone V, Tasinato N. Accurate Biomolecular Structures by the Nano-LEGO Approach: Pick the Bricks and Build Your Geometry. J Chem Theory Comput 2021; 17:7290-7311. [PMID: 34666488 PMCID: PMC8582257 DOI: 10.1021/acs.jctc.1c00788] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
The determination
of accurate equilibrium molecular structures
plays a fundamental role for understanding many physical–chemical
properties of molecules, ranging from the precise evaluation of the
electronic structure to the analysis of the role played by dynamical
and environmental effects in tuning their overall behavior. For small
semi-rigid systems in the gas phase, state-of-the-art quantum chemical
computations rival the most sophisticated experimental (from, for
example, high-resolution spectroscopy) results. For larger molecules,
more effective computational approaches must be devised. To this end,
we have further enlarged the compilation of available semi-experimental
(SE) equilibrium structures, now covering the most important fragments
containing H, B, C, N, O, F, P, S, and Cl atoms collected in the new
SE100 database. Next, comparison with geometries optimized by methods
rooted in the density functional theory showed that the already remarkable
results delivered by PW6B95 and, especially, rev-DSDPBEP86 functionals
can be further improved by a linear regression (LR) approach. Use
of template fragments (taken from the SE100 library) together with
LR estimates for the missing interfragment parameters paves the route
toward accurate structures of large molecules, as witnessed by the
very small deviations between computed and experimental rotational
constants. The whole approach has been implemented in a user-friendly
tool, termed nano-LEGO, and applied to a number of demanding case
studies.
Collapse
Affiliation(s)
- Giorgia Ceselin
- Scuola Normale Superiore, Piazza Dei Cavalieri 7, I-56126 Pisa, Italy
| | - Vincenzo Barone
- Scuola Normale Superiore, Piazza Dei Cavalieri 7, I-56126 Pisa, Italy
| | - Nicola Tasinato
- Scuola Normale Superiore, Piazza Dei Cavalieri 7, I-56126 Pisa, Italy
| |
Collapse
|
3
|
Demaison J, Vogt N, Saragi RT, Juanes M, Rudolph HD, Lesarri A. How flexible is the disulfide linker? A combined rotational–computational investigation of diallyl disulfide. Phys Chem Chem Phys 2019; 21:19732-19736. [PMID: 31192318 DOI: 10.1039/c9cp02508a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The symmetrically substituted diallyl disulfide adopts an asymmetric conformation in the gas phase, as observed in the rotational spectrum.
Collapse
Affiliation(s)
- Jean Demaison
- Section of Chemical Information Systems
- University of Ulm
- 89069 Ulm
- Germany
| | - Natalja Vogt
- Section of Chemical Information Systems
- University of Ulm
- 89069 Ulm
- Germany
- Department of Chemistry
| | - Rizalina Tama Saragi
- Departamento de Química Física y Química Inorgánica – IU CINQUIMA
- Facultad de Ciencias
- Universidad de Valladolid
- 47011 Valladolid
- Spain
| | - Marcos Juanes
- Departamento de Química Física y Química Inorgánica – IU CINQUIMA
- Facultad de Ciencias
- Universidad de Valladolid
- 47011 Valladolid
- Spain
| | | | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica – IU CINQUIMA
- Facultad de Ciencias
- Universidad de Valladolid
- 47011 Valladolid
- Spain
| |
Collapse
|
4
|
Demaison J, Vogt N, Saragi RT, Juanes M, Rudolph HD, Lesarri A. The S−S Bridge: A Mixed Experimental‐Computational Estimation of the Equilibrium Structure of Diphenyl Disulfide. Chemphyschem 2018; 20:366-373. [DOI: 10.1002/cphc.201800973] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 11/26/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Jean Demaison
- Section of Chemical Information SystemsUniversity of Ulm 89069 Ulm Germany
| | - Natalja Vogt
- Section of Chemical Information SystemsUniversity of Ulm 89069 Ulm Germany
- Department of ChemistryLomonosov Moscow State University 119992 Moscow Russia
| | - Rizalina Tama Saragi
- Departamento de Química Física y Química Inorgánica - IU CINQUIMA, Facultad de CienciasUniversidad de Valladolid, Paseo de Belén, 7 47011 Valladolid Spain
| | - Marcos Juanes
- Departamento de Química Física y Química Inorgánica - IU CINQUIMA, Facultad de CienciasUniversidad de Valladolid, Paseo de Belén, 7 47011 Valladolid Spain
| | | | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica - IU CINQUIMA, Facultad de CienciasUniversidad de Valladolid, Paseo de Belén, 7 47011 Valladolid Spain
| |
Collapse
|
5
|
Vogt N, Demaison J, Rudolph HD, Juanes M, Fernández J, Lesarri A. Semiexperimental and mass-dependent structures by the mixed regression method: Accurate equilibrium structure and failure of the Kraitchman method for ethynylcyclohexane. J Chem Phys 2018; 148:064306. [DOI: 10.1063/1.5018053] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Natalja Vogt
- Section of Chemical Information Systems, University of Ulm, Albert-Einstein-Allee 47, 89081 Ulm, Germany
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Jean Demaison
- Section of Chemical Information Systems, University of Ulm, Albert-Einstein-Allee 47, 89081 Ulm, Germany
| | - Heinz Dieter Rudolph
- Section of Chemical Information Systems, University of Ulm, Albert-Einstein-Allee 47, 89081 Ulm, Germany
| | - Marcos Juanes
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain
| | - Jairo Fernández
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain
| |
Collapse
|
6
|
Vallejo-López M, Écija P, Vogt N, Demaison J, Lesarri A, Basterretxea FJ, Cocinero EJ. N-Methyl Inversion and Accurate Equilibrium Structures in Alkaloids: Pseudopelletierine. Chemistry 2017; 23:16491-16496. [PMID: 28759141 DOI: 10.1002/chem.201702232] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Indexed: 11/06/2022]
Abstract
A rotational spectroscopy investigation has resolved the conformational equilibrium and structural properties of the alkaloid pseudopelletierine. Two different conformers, which originate from inversion of the N-methyl group from an axial to an equatorial position, have been unambiguously identified in the gas phase, and nine independent isotopologues have been recorded by Fourier-transform microwave spectroscopy in a jet expansion. Both conformers share a chair-chair configuration of the two bridged six-membered rings. The conformational equilibrium is displaced towards the axial form, with a relative population in the supersonic jet of Naxial /Nequatorial ≈2/1. An accurate equilibrium structure has been determined by using the semiexperimental mixed-estimation method and alternatively computed by quantum-chemical methods up to the coupled-cluster level of theory. A comparison with the N-methyl inversion equilibria in related tropanes is also presented.
Collapse
Affiliation(s)
- Montserrat Vallejo-López
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Apartado 644, 48080, Bilbao, Spain
| | - Patricia Écija
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Apartado 644, 48080, Bilbao, Spain
| | - Natalja Vogt
- Chemical Information Systems, Faculty of Sciences, University of Ulm, 89069, Ulm, Germany
| | - Jean Demaison
- Chemical Information Systems, Faculty of Sciences, University of Ulm, 89069, Ulm, Germany
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47011, Valladolid, Spain
| | - Francisco J Basterretxea
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Apartado 644, 48080, Bilbao, Spain
| | - Emilio J Cocinero
- Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Apartado 644, 48080, Bilbao, Spain
| |
Collapse
|
7
|
Mendolicchio M, Penocchio E, Licari D, Tasinato N, Barone V. Development and Implementation of Advanced Fitting Methods for the Calculation of Accurate Molecular Structures. J Chem Theory Comput 2017; 13:3060-3075. [PMID: 28437115 DOI: 10.1021/acs.jctc.7b00279] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The determination of accurate equilibrium molecular structures plays a fundamental role for understanding many physical-chemical properties of molecules, ranging from the precise evaluation of the electronic structure to the analysis of dynamical and environmental effects in tuning their overall behavior. For this purpose the so-called semiexperimental approach, based on a nonlinear least-squares fit of the moments of inertia associated with a set of available isotopologues, allows one to obtain very accurate results, without the unfavorable computational cost characterizing high-level quantum chemical methods. In the present work the MSR (Molecular Structure Refinement) software for the determination of equilibrium structures by means of the semiexperimental approach is presented, and its implementation is discussed in some detail. The software, which is interfaced with a powerful graphical user interface, includes different optimization algorithms, an extended error analysis, and a number of advanced features, the most remarkable ones concerning the choice of internal coordinates and the method of predicate observations. In particular, a new black-box scheme for defining automatically a suitable set of nonredundant internal coordinates of A1 symmetry in place of the customary Z-matrix has been designed and tested. Finally, the implementation of the method of the predicate observations is discussed and validated for a set of test molecules. As an original application, the method is employed for the determination of the semiexperimental structure for the most stable conformer of glycine.
Collapse
Affiliation(s)
| | | | - Daniele Licari
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
| | - Nicola Tasinato
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
| | - Vincenzo Barone
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
| |
Collapse
|
8
|
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.
Collapse
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
| |
Collapse
|
9
|
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
| |
Collapse
|
10
|
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.
Collapse
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
| | | |
Collapse
|
11
|
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.
Collapse
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
| |
Collapse
|
12
|
Piccardo M, Penocchio E, Puzzarini C, Biczysko M, Barone V. Semi-Experimental Equilibrium Structure Determinations by Employing B3LYP/SNSD Anharmonic Force Fields: Validation and Application to Semirigid Organic Molecules. J Phys Chem A 2015; 119:2058-82. [DOI: 10.1021/jp511432m] [Citation(s) in RCA: 111] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Matteo Piccardo
- Scuola Normale Superiore, Piazza
dei Cavalieri 7, I-56126 Pisa, Italy
| | - Emanuele Penocchio
- Scuola Normale Superiore, Piazza
dei Cavalieri 7, I-56126 Pisa, Italy
- Dipartimento
di Chimica “Giacomo Ciamician”, Universitá di Bologna, Via Selmi 2, I-40126 Bologna, Italy
| | - Cristina Puzzarini
- Dipartimento
di Chimica “Giacomo Ciamician”, Universitá di Bologna, Via Selmi 2, I-40126 Bologna, Italy
| | - Malgorzata Biczysko
- Consiglio Nazionale delle Ricerche, Istituto di Chimica
dei Composti OrganoMetallici (ICCOM-CNR), Area della Ricerca CNR,
UOS di Pisa, Via G. Moruzzi
1, I-56124 Pisa, Italy
| | - Vincenzo Barone
- Scuola Normale Superiore, Piazza
dei Cavalieri 7, I-56126 Pisa, Italy
| |
Collapse
|
13
|
Barone V, Biczysko M, Bloino J, Puzzarini C. Accurate molecular structures and infrared spectra of trans-2,3-dideuterooxirane, methyloxirane, and trans-2,3-dimethyloxirane. J Chem Phys 2014; 141:034107. [PMID: 25053301 PMCID: PMC4612369 DOI: 10.1063/1.4887357] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Oxirane derivatives are the most used benchmarks for chiroptical spectroscopies in view of their small size and relative rigidity. The molecular structure, vibrational harmonic and anharmonic frequencies, and infrared intensities of the ground electronic states are analyzed in this paper. Equilibrium structure and harmonic force fields have been evaluated by means of high-level quantum-chemical calculations at the coupled-cluster level including single and double excitations together with a perturbative treatment of triples (CCSD(T)). Extrapolation to the complete basis-set limit as well as core-correlation effects have also been taken into account. Anharmonic contributions have been computed at the CCSD(T)/cc-pVTZ level for trans-2,3-dideuterooxirane. These data can serve as references to evaluate the accuracy of less expensive computational approaches rooted in the density functional theory (DFT). The latter have been used within hybrid CC/DFT approaches, which have been applied to simulate fully anharmonic infrared (IR) spectra. Finally, the best theoretical estimates of the equilibrium structures and vibrational wavenumbers are compared to the most accurate experimental data and show in all cases very good agreement, i.e., within 0.001 Å, 0.1 deg, 10 cm(-1), and 0.5 km mol(-1), for bond lengths, angles, wavenumbers, and IR intensities, respectively.
Collapse
Affiliation(s)
- Vincenzo Barone
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
| | | | - Julien Bloino
- Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
| | - Cristina Puzzarini
- Dipartimento di Chimica "Giacomo Ciamician," Università di Bologna, Via F. Selmi 2, I-40126 Bologna, Italy
| |
Collapse
|
14
|
Demaison J, Craig NC, Groner P, Écija P, Cocinero EJ, Lesarri A, Rudolph HD. Accurate Equilibrium Structures for Piperidine and Cyclohexane. J Phys Chem A 2014; 119:1486-93. [DOI: 10.1021/jp505765t] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jean Demaison
- Laboratoire
de Physique des Lasers, Atomes et Molécules, Université de Lille 1, 59655 Villeneuve d’Ascq Cedex, France
| | - Norman C. Craig
- Department
of Chemistry and Biochemistry, Oberlin College, Oberlin, Ohio 44074, United States
| | - Peter Groner
- Department
of Chemistry, University of Missouri—Kansas City, Kansas City, Missouri 64110-2499, United States
| | - Patricia Écija
- Departamento
de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV-EHU), Ap. 644, E-48080 Bilbao, Spain
| | - Emilio J. Cocinero
- Departamento
de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV-EHU), Ap. 644, E-48080 Bilbao, Spain
| | - Alberto Lesarri
- Departamento
de Química Física y Química Inorgánica,
Facultad de Ciencias, Universidad de Valladolid, E-47011 Valladolid, Spain
| | | |
Collapse
|
15
|
Craig NC, Chen Y, Fuson HA, Tian H, van Besien H, Conrad AR, Tubergen MJ, Rudolph HD, Demaison J. Microwave spectra of the deuterium isotopologues of cis-hexatriene and a semiexperimental equilibrium structure. J Phys Chem A 2013; 117:9391-400. [PMID: 23237234 DOI: 10.1021/jp311035c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Microwave transitions and ground state rotational constants are reported for five newly synthesized deuterium isotopologues of cis-1,3,5-hexatriene (cHTE). These rotational constants along with those of the parent and the three (13)C species are used with vibration-rotation constants calculated from an MP2/cc-pVTZ model to derive an equilibrium structure. That structure is improved by the mixed estimation method. In this method, internal coordinates from good-quality quantum chemical calculations (with appropriate uncertainties) are fit simultaneously with moments of inertia of the full set of isotopologues. The new structure of cHTE is confirmed to be planar and is stabilized by an interaction between the hydrogen atoms H2 and H5, which form a bond and participate in a six-membered ring. cHTE shows larger structural effects of π-electron delocalization than does butadiene with the effects being magnified in the center of the molecule. Thus, strong structural evidence now exists for an increase in π-electron delocalization as the polyene chain lengthens.
Collapse
Affiliation(s)
- Norman C Craig
- Department of Chemistry and Biochemistry, Oberlin College , Oberlin, Ohio 44074, United States
| | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Demaison J, Rudolph HD, Császár AG. Deformation of the benzene ring upon fluorination: equilibrium structures of all fluorobenzenes. Mol Phys 2013. [DOI: 10.1080/00268976.2013.793843] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Jean Demaison
- a Laboratoire de Physique des Lasers, Atomes et Molécules , Université de Lille I , France
| | | | - Attila G. Császár
- c Laboratory of Molecular Structure and Dynamics, Institute of Chemistry , Eötvös University , Budapest , Hungary
| |
Collapse
|
17
|
Abstract
Rotational spectroscopy is known to be a technique that is widely used to infer information on molecular structure and dynamics. In the last few decades, its role in the field of atmospheric and astrophysical investigations has rapidly grown. However, several are the challenging aspects in rotational spectroscopy, since the detection and analysis of spectra as well as interpretation of obtained results are not at all straightforward. Quantum chemistry has reached such an accuracy that can be used to disentangle these challenging situations by guiding the experimental investigation, assisting in the determination of the spectroscopic parameters, and extracting information of chemical interest. This perspective provides an overview of the theoretical background and computational requirements needed for the accurate evaluation of the spectroscopic parameters of relevance to rotational spectroscopy. The role of theory in guiding and supporting experiment is detailed through a few examples, and the interplay of experiment and theory is discussed in terms of the information of physical and chemical interest that can be derived.
Collapse
Affiliation(s)
- Cristina Puzzarini
- Dipartimento di Chimica Giacomo Ciamician, Università di Bologna, Via Selmi 2, I-40126 Bologna, Italy.
| |
Collapse
|
18
|
Demaison J, Jahn MK, Cocinero EJ, Lesarri A, Grabow JU, Guillemin JC, Rudolph HD. Accurate Semiexperimental Structure of 1,3,4-Oxadiazole by the Mixed Estimation Method. J Phys Chem A 2013; 117:2278-84. [DOI: 10.1021/jp400505v] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jean Demaison
- Laboratoire de Physique des
Lasers, Atomes et Molécules, Université de Lille I, 59655 Villeneuve d’Ascq Cedex, France
| | - Michaela K. Jahn
- Institut für Physikalische Chemie & Elektrochemie, Lehrgebiet A, Gottfried-Wilhelm-Leibniz Universität, Callinstraße 3A, D-30167 Hannover, Germany
| | - Emilio J. Cocinero
- Departamento de Quı́mica
Fı́sica, Facultad de Ciencia y Tecnologı́a, Universidad del Paı́s Vasco (UPV-EHU),
Ap. 644, E-48080 Bilbao, Spain
| | - Alberto Lesarri
- Departamento de Quı́mica
Fı́sica y Quı́mica Inorgánica, Facultad
de Ciencias, Universidad de Valladolid,
E-47011 Valladolid, Spain
| | - Jens-Uwe Grabow
- Institut für Physikalische Chemie & Elektrochemie, Lehrgebiet A, Gottfried-Wilhelm-Leibniz Universität, Callinstraße 3A, D-30167 Hannover, Germany
| | - Jean-Claude Guillemin
- Institut
des Sciences Chimiques de
Rennes, École Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, Avenue du Général Leclerc,
CS 50837, 35708 Rennes Cedex 7, France
| | | |
Collapse
|
19
|
Demaison J, Craig NC, Conrad AR, Tubergen MJ, Rudolph HD. Semiexperimental Equilibrium Structure of the Lower Energy Conformer of Glycidol by the Mixed Estimation Method. J Phys Chem A 2012; 116:9116-22. [PMID: 22894798 DOI: 10.1021/jp305504x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Jean Demaison
- Laboratoire de Physique des
Lasers, Atomes et Molécules, Université de Lille I, 59655 Villeneuve d’Ascq Cedex, France
| | - Norman C. Craig
- Department of Chemistry and
Biochemistry, Oberlin College, Oberlin,
Ohio 44074, United States
| | | | | | | |
Collapse
|