1
|
Mihrin D, Jakobsen PW, Voute A, Manceron L, Wugt Larsen R. High-Resolution Infrared Synchrotron Investigation of (HCN) 2 and a Semi-Experimental Determination of the Dissociation Energy D 0. Chemphyschem 2019; 20:3238-3244. [PMID: 31702872 PMCID: PMC6916300 DOI: 10.1002/cphc.201900811] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Indexed: 11/27/2022]
Abstract
The high‐resolution infrared absorption spectrum of the donor bending fundamental band ν61
of the homodimer (HCN)2 has been collected by long‐path static gas‐phase Fourier transform spectroscopy at 207 K employing the highly brilliant 2.75 GeV electron storage ring source at Synchrotron SOLEIL. The rovibrational structure of the ν61
transition has the typical appearance of a perpendicular type band associated with a Σ–Π transition for a linear polyatomic molecule. The total number of 100 assigned transitions are fitted employing a standard semi‐rigid linear molecule Hamiltonian, providing the band origin ν0 of 779.05182(50) cm−1 together with spectroscopic parameters for the degenerate excited state. This band origin, blue‐shifted by 67.15 cm−1 relative to the HCN monomer, provides the final significant contribution to the change of intra‐molecular vibrational zero‐point energy upon HCN dimerization. The combination with the vibrational zero‐point energy contribution determined recently for the class of large‐amplitude inter‐molecular fundamental transitions then enables a complete determination of the total change of vibrational zero‐point energy of 3.35±0.30 kJ mol−1. The new spectroscopic findings together with previously reported benchmark CCSDT(Q)/CBS electronic energies [Hoobler et al. ChemPhysChem. 19, 3257–3265 (2018)] provide the best semi‐experimental estimate of 16.48±0.30 kJ mol−1 for the dissociation energy D0 of this prototypical homodimer.
Collapse
Affiliation(s)
- D Mihrin
- Department of Chemistry, Technical University of Denmark, Kemitorvet 206, 2800, Kgs. Lyngby, Denmark
| | - P W Jakobsen
- Department of Chemistry, Technical University of Denmark, Kemitorvet 206, 2800, Kgs. Lyngby, Denmark
| | - A Voute
- Department of Chemistry, Technical University of Denmark, Kemitorvet 206, 2800, Kgs. Lyngby, Denmark
| | - L Manceron
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin-BP 48, 91192, Gif-sur-Yvette Cedex, France.,Lab. MONARIS, CNRS-UPMC UMR8233, 4 Place Jussieu, 75230, Paris Cedex, France
| | - R Wugt Larsen
- Department of Chemistry, Technical University of Denmark, Kemitorvet 206, 2800, Kgs. Lyngby, Denmark
| |
Collapse
|
2
|
Quantum-mechanical study of energies, structures and vibrational spectra of the HF complexed with dimethyl ether. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.07.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
3
|
Mihrin D, Wugt Larsen R. THz spectroscopy of weakly bound cluster molecules in solid para-hydrogen: a sensitive probe of van der Waals interactions. Phys Chem Chem Phys 2018; 21:349-358. [PMID: 30525164 DOI: 10.1039/c8cp05060k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present work demonstrates that 99.9% enriched solid para-H2 below 3 K provides an excellent inert and transparent medium for the exploration of large-amplitude intermolecular vibrational motion of weakly bound van der Waals cluster molecules in the THz spectral region. THz absorption spectra have been generated for CO2/H2O and CS2/H2O mixtures embedded in enriched solid para-H2 and numerous observed transitions associated with large-amplitude librational motion of the weakly bound binary CO2H2O and CS2H2O van der Waals cluster molecules have been assigned together with tentative assignments for the ternary CS2(H2O)2 system. The interaction strength, directionality and anharmonicity of the weak van der Waals "bonds" between the molecules can be characterized via these THz spectral signatures and yield rigorous benchmarks for high-level ab initio methodologies. It is suggested that even a less stable linear conformation of the ternary CS2(H2O)2 system, where one H2O molecule is linked to each S atom of the CS2 subunit, may be formed due to the kinetics associated with the mobility of free H2O molecules in the soft para-H2 medium. In addition, the spectroscopic observations confirm a linear and planar global intermolecular potential energy minimum for the binary CS2H2O system with C2v symmetry, where the O atom on the H2O molecule is linked to one of the S atoms on the CS2 subunit. A semi-experimental value for the vibrational zero-point energy contribution of 1.93 ± 0.10 kJ mol-1 from the class of large-amplitude intermolecular vibrational modes is proposed. The combination with CCSD(T)/CBS electronic energy predictions provides a semi-experimental estimate of 5.08 ± 0.15 kJ mol-1 for the binding energy D0 of the CS2H2O van der Waals system.
Collapse
Affiliation(s)
- D Mihrin
- Department of Chemistry, Technical University of Denmark, Kemitorvet 206, 2800 Kgs. Lyngby, Denmark.
| | | |
Collapse
|
4
|
Mihrin D, Jakobsen PW, Voute A, Manceron L, Wugt Larsen R. High-resolution synchrotron terahertz investigation of the large-amplitude hydrogen bond librational band of (HCN) 2. Phys Chem Chem Phys 2018. [PMID: 29528052 DOI: 10.1039/c7cp08412a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The high-resolution terahertz absorption spectrum of the large-amplitude intermolecular donor librational band ν of the homodimer (HCN)2 has been recorded by means of long-path static gas-phase Fourier transform spectroscopy at 207 K employing a highly brilliant electron storage ring source. The rovibrational structure of the ν band has the typical appearance of a perpendicular type band of a Σ-Π transition for a linear polyatomic molecule. The generated terahertz spectrum is analyzed employing a standard semi-rigid linear molecule Hamiltonian, yielding a band origin ν0 of 119.11526(60) cm-1 together with values for the excited state rotational constant B', the excited state quartic centrifugal distortion constant DJ' and the l-type doubling constant q for the degenerate state associated with the ν mode. The until now missing donor librational band origin enables the determination of an accurate experimental value for the vibrational zero-point energy of 2.50 ± 0.05 kJ mol-1 arising from the entire class of large-amplitude intermolecular modes. The spectroscopic findings are complemented by CCSD(T)-F12b/aug-cc-pV5Z (electronic energies) and CCSD(T)-F12b/aug-cc-pVQZ (force fields) electronic structure calculations, providing a (semi)-experimental value of 17.20 ± 0.20 kJ mol-1 for the dissociation energy D0 of this strictly linear weak intermolecular CHN hydrogen bond.
Collapse
Affiliation(s)
- D Mihrin
- Department of Chemistry, Technical University of Denmark, Kemitorvet 206, 2800 Kgs. Lyngby, Denmark.
| | - P W Jakobsen
- Department of Chemistry, Technical University of Denmark, Kemitorvet 206, 2800 Kgs. Lyngby, Denmark.
| | - A Voute
- Department of Chemistry, Technical University of Denmark, Kemitorvet 206, 2800 Kgs. Lyngby, Denmark.
| | - L Manceron
- Synchrotron SOLEIL, L'orme des Merisiers, Saint-Aubin-BP 48, 91192 Gif-sur-Yvette Cedex, France and Lab. MONARIS, CNRS-UPMC UMR8233, 4 Place Jussieu, 75230 Paris Cedex, France
| | - R Wugt Larsen
- Department of Chemistry, Technical University of Denmark, Kemitorvet 206, 2800 Kgs. Lyngby, Denmark.
| |
Collapse
|
5
|
Boda Ł, Boczar M, Gług M, Wójcik MJ. Quantum-mechanical study of energies, structures, and vibrational spectra of the H(D)Cl complexed with dimethyl ether. J Chem Phys 2015; 143:204302. [PMID: 26627954 DOI: 10.1063/1.4935805] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Interaction energies, molecular structure and vibrational frequencies of the binary complex formed between H(D)Cl and dimethyl ether have been obtained using quantum-chemical methods. Equilibrium and vibrationally averaged structures, harmonic and anharmonic wavenumbers of the complex and its deuterated isotopomer were calculated using harmonic and anharmonic second-order perturbation theory procedures with Density Functional Theory B3LYP and B2PLYP-D and ab initio Møller-Plesset second-order methods, and a 6-311++G(3d,3p) basis set. A phenomenological model describing anharmonic-type vibrational couplings within hydrogen bonds was developed to explain the unique broadening and fine structure, as well as the isotope effect of the Cl-H and Cl-D stretching IR absorption bands in the gaseous complexes with dimethyl ether, as an effect of hydrogen bond formation. Simulations of the rovibrational structure of the Cl-H and Cl-D stretching bands were performed and the results were compared with experimental spectra.
Collapse
Affiliation(s)
- Łukasz Boda
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
| | - Marek Boczar
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
| | - Maciej Gług
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
| | - Marek J Wójcik
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
| |
Collapse
|
6
|
Wong A, Thompson CD, Appadoo DR, Plathe R, Roy P, Manceron L, Barros J, McNaughton D. Synchrotron far-infrared spectroscopy of the two lowest fundamental modes of 1,1-difluoroethane. Mol Phys 2013. [DOI: 10.1080/00268976.2013.797115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Andy Wong
- School of Chemistry, Monash University , Clayton, Australia
| | | | | | | | - Pascale Roy
- Synchrotron SOLEIL, l’Orme des Merisiers , Saint-Aubin, France
| | - Laurent Manceron
- Synchrotron SOLEIL, l’Orme des Merisiers , Saint-Aubin, France
- LADIR, CNRS-UPMC, UMR 7075 , Paris, France
| | - Joanna Barros
- Synchrotron SOLEIL, l’Orme des Merisiers , Saint-Aubin, France
| | - Don McNaughton
- School of Chemistry, Monash University , Clayton, Australia
| |
Collapse
|
7
|
Baldacci A, Stoppa P, Visinoni R, Larsen RW. High resolution infrared synchrotron study of CH2D81Br: ground state constants and analysis of the ν5, ν6and ν9fundamentals. Mol Phys 2012. [DOI: 10.1080/00268976.2012.683886] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
8
|
Cazzoli G, Cludi L, Puzzarini C, Stoppa P, Charmet AP, Tasinato N, Baldacci A, Baldan A, Giorgianni S, Larsen RW, Stopkowicz S, Gauss J. Microwave, High-Resolution Infrared, and Quantum Chemical Investigations of CHBrF2: Ground and v4 = 1 States. J Phys Chem A 2010; 115:453-9. [DOI: 10.1021/jp110510v] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | | | | | | | | | - René Wugt Larsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | | | | |
Collapse
|
9
|
Baldacci A, Visinoni R, Wugt Larsen R. High resolution synchrotron far-infrared study of CH2D79Br: The v6 fundamental and 2v6−v6, v5+v6−v6 and v6+v9−v6 hot bands. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.09.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
10
|
Baldacci A, Stoppa P, Giorgianni S, Wugt Larsen R. High-resolution FTIR spectrum of CH2D79Br: the ground,v5=1 andv9=1 state constants. Mol Phys 2010. [DOI: 10.1080/00268970903567270] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
11
|
High resolution synchrotron FTIR spectroscopy of the far infrared ν10 and ν11 bands of R152a (CH3CHF2). Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.10.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
12
|
Conformational studies of aliphatic secondary ozonides (propene, 1-butene and 1-heptene) by means of FTIR spectroscopy. OPEN CHEM 2006. [DOI: 10.2478/s11532-006-0031-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AbstractOzonization reaction of simple alkenes was studied by means of FT infrared absorption gas spectroscopy. The reaction was performed at 95 K in neat films of the reactants. IR absorption spectra of the gaseous products were recorded. The spectra were analyzed combining experimental results with theoretical calculations performed at B3LYP 6-311++G (3df, 3pd) level. We found that among all theoretically predicted conformers of propene secondary ozonide, only one which has the O-O half-chair configuration for the five membered ring and the radical attached in the equatorial position was present in the sample. Samples of 1-butene and 1-heptene secondary ozonides consist from two conformers of very similar energy (ΔH=0.3 kJ/mol). The most stable conformer for both ozonides is the one with O-O half-chair configuration of the five membered ring and the radical attached in equatorial position and the aliphatic chain in gauche position. The second stable conformer has the aliphatic chain in anti position.
Collapse
|
13
|
Wugt Larsen R, Hegelund F, Nelander B. Observation and rovibrational analysis of the intermolecular NH3 libration band nu9(1) of H3N-HCN. J Phys Chem A 2005; 109:4459-63. [PMID: 16833781 DOI: 10.1021/jp044740w] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The high-resolution far-infrared absorption spectrum of the gaseous molecular complex H(3)N-HCN is recorded by means of static gas-phase Fourier transform far-infrared spectroscopy at 247 K, using a synchrotron radiation source. The spectrum contains distinct rotational structures which are assigned to the intermolecular NH(3) libration band nu9(1) (nu(B)) of the pyramidal H(3)N-HCN complex. A rovibrational analysis based on a standard semirigid symmetric top molecule model yields the band origin of 260.03(10) cm(-1), together with values for the upper state rotational constant B' and the upper state quartic centrifugal distortion constants D'(J) and D'(JK). The values for the upper state spectroscopic constants indicate that the hydrogen bond in the H(3)N-HCN complex is destabilized by 5% and elongates by 0.010 A upon excitation of a quantum of libration of the hydrogen bond acceptor molecule.
Collapse
Affiliation(s)
- R Wugt Larsen
- Chemical Center, Department of Chemical Physics, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
| | | | | |
Collapse
|
14
|
Larsen RW, Hegelund F, Nelander B. Observation and rovibrational analysis of the intermolecular HCl libration band upsilon6(1) of HCN-HCl, DCN-HCl and H13CN-HCL. Phys Chem Chem Phys 2005; 7:1953-9. [PMID: 19787898 DOI: 10.1039/b416924g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The high-resolution far-infrared absorption spectrum of the intermolecular HC1 libration band upsilon6(1) (upsilonB) of the gaseous molecular complex H12CN-HCl and the two isotopically substituted species H13CN-HCl and D12CN-HCl is recorded by means of static gas-phase Fourier transform far-infrared spectroscopy at 205 K using an electron storage ring source. The rotational structure of the upsilon6(1) band has the typical appearance of a perpendicular type band of a linear polyatomic molecule. The structure is analyzed using a standard semi-rigid linear molecule model including l-type doubling to yield the band origin upsilon0, together with values for the upper state rotational constant B', the upper state quartic centrifugal distortion constant D'j and the value for the l-type doubling constant q6. The values for the ground-state spectroscopic constants B" and D"j for D12CN-H35Cl and H13CN-H35Cl are determined for the first time by ground state combination difference analyses. A number of upsilon6(1) + upsilon7(1) - upsilon7(1) and upsilon6(1) + 2upsilon7(2) - 2upsilon7(2) hot bands are observed in the spectra and the sum of the anharmonicity constants X(6,7) + g(6,7) is estimated. The observed decrease of the rotational constant B together with the simultaneous increase of the quartic centrifugal distortion constant Dj upon excitation of the HCl libration mode indicate that the hydrogen bond in the molecular complex is significantly destabilized upon intermolecular vibrational excitation. The calculated harmonic force constants for the intermolecular hydrogen bond stretching vibration upsilon(sigma) for the ground state and the excited HCl libration state indicate that the excitation of the HCl libration mode destabilizes the intermolecular interaction between HCN and HCl by almost 20%. The hydrogen bond is elongated by 0.030 A upon excitation of the upsilon6(1) mode.
Collapse
Affiliation(s)
- R Wugt Larsen
- Chemical Center, Department of Chemical Physics, Lund University, P.O. Box 124, S-22100 Lund, Sweden
| | | | | |
Collapse
|