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Hartwig B, Schnell M, Suhm MA, Obenchain DA. Weak hydrogen bonding to halogens and chirality communication in propanols: Raman and microwave spectroscopy benchmark theory. Phys Chem Chem Phys 2024; 26:9432-9452. [PMID: 38446207 DOI: 10.1039/d3cp04911f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
Constitutional and conformational isomers of bromopropanol are vibrationally and rotationally characterised with parallels drawn to the structural chlorine analogues. A previous microwave spectroscopic study of the chloropropanols is re-examined and all systems are explored by Raman jet spectroscopy. For bromine, the entire nuclear quadrupole coupling tensors are accurately determined and compared to their chlorine counterparts. Tensor asymmetry parameters are determined and linked with the hydrogen bond strength as indicated by the downshift of the OH-stretching frequency. The spectroscopic constants derived from the observed transitions are used as benchmarks for a large variety of electronic structure methods followed by harmonic and anharmonic rovibrational treatments. The CCSD(T) electronic structure calculations provide the best performance, in particular once anharmonic and relativistic corrections are applied or implied. Standard DFT approaches vary substantially with respect to their systematic error cancellation across the investigated species, and cost-effective compromises for the different observables are proposed.
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Affiliation(s)
- Beppo Hartwig
- Institut für Physikalische Chemie, Tammannstrasse 6, 37077 Göttingen, Germany.
| | - Melanie Schnell
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
- Institute of Physical Chemistry, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 1, 24118 Kiel, Germany
| | - Martin A Suhm
- Institut für Physikalische Chemie, Tammannstrasse 6, 37077 Göttingen, Germany.
| | - Daniel A Obenchain
- Institut für Physikalische Chemie, Tammannstrasse 6, 37077 Göttingen, Germany.
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2
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Conformer Selection by Electrostatic Hexapoles: A Theoretical Study on 1-Chloroethanol and 2-Chloroethanol. Symmetry (Basel) 2022. [DOI: 10.3390/sym14020317] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/10/2022] Open
Abstract
The electrostatic hexapole is a versatile device that has been used for many years in gas-phase experiments. Its inhomogeneous electric field has been employed for many purposes such as the selection of rotational states, the selection of clusters, the focusing of molecular beams, and molecular alignment as a precursor for molecular orientation. In the last few years, the hexapolar electric field has been demonstrated to be able to control the conformer composition of molecular beams. The key point is that conformers, where the component of the permanent electric dipole moment with respect to the largest of the principal axes of inertia is close to zero, require more intense hexapolar electric fields to be focused with respect to the other conformers. Here, we simulated the focusing curves of the conformers of 1-chloroethanol and 2-chloroethanol under hypothetical beam conditions, identical for all conformers, in a hypothetical and realistic experimental setup with three different hexapole lengths: 0.5, 1, and 2 m. The objective was to characterize this selection process to set up collision experiments on conformer-selected beams that provide information on the van der Waals clusters formed in collision processes.
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Kawashima Y, Tanaka Y, Uzuyama T, Hirota E. Conformations and Low-Frequency Intramolecular Motions of 1-Butanol, 1-Butanethiol, Iso-butanol, and Iso-butanethiol Investigated by Fourier Transform Microwave Spectroscopy Combined with Quantum Chemical Calculations. J Phys Chem A 2021; 125:1166-1183. [DOI: 10.1021/acs.jpca.0c09687] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yoshiyuki Kawashima
- Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology, Atsugi, Kanagawa 240-0292, Japan
| | - Yugo Tanaka
- Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology, Atsugi, Kanagawa 240-0292, Japan
| | - Taigo Uzuyama
- Department of Applied Chemistry, Faculty of Engineering, Kanagawa Institute of Technology, Atsugi, Kanagawa 240-0292, Japan
| | - Eizi Hirota
- The Graduate University for Advanced Studies, Hayama, Kanagawa 240-0193, Japan
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4
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Martens J, Bhushan R. Enantioseparations in Achiral Environments and Chromatographic Systems. Isr J Chem 2016. [DOI: 10.1002/ijch.201600086] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jürgen Martens
- Institute of Chemistry; Carl von Ossietzky University Oldenburg; Carl-von-Ossietzky-Strasse 9-11, DE- 26129 Oldenburg Germany
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Li W, Spada L, Evangelisti L, Caminati W. Conformational Equilibrium and Potential Energy Functions of the O–H Internal Rotation in the Axial and Equatorial Species of 1-Methylcyclohexanol. J Phys Chem A 2016; 120:4338-42. [DOI: 10.1021/acs.jpca.6b03854] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Weixing Li
- Dipartimento di Chimica “G.
Ciamician” dell’Università, Via Selmi 2, I-40126 Bologna, Italy
| | - Lorenzo Spada
- Dipartimento di Chimica “G.
Ciamician” dell’Università, Via Selmi 2, I-40126 Bologna, Italy
| | - Luca Evangelisti
- Dipartimento di Chimica “G.
Ciamician” dell’Università, Via Selmi 2, I-40126 Bologna, Italy
| | - Walther Caminati
- Dipartimento di Chimica “G.
Ciamician” dell’Università, Via Selmi 2, I-40126 Bologna, Italy
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6
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Parker SF, Silverwood IP, Hamilton NG, Lennon D. Structural and spectroscopic characterisation of C4 oxygenates relevant to structure/activity relationships of the hydrogenation of α,β-unsaturated carbonyls. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 153:289-297. [PMID: 26318704 DOI: 10.1016/j.saa.2015.08.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Revised: 08/11/2015] [Accepted: 08/16/2015] [Indexed: 06/04/2023]
Abstract
In the present work, we have investigated the conformational isomerism and calculated the vibrational spectra of the C4 oxygenates: 3-butyne-2-one, 3-butene-2-one, 2-butanone and 2-butanol using density functional theory. The calculations are validated by comparison to structural data where available and new, experimental inelastic neutron scattering and infrared spectra of the compounds. We find that for 3-butene-2-one and 2-butanol the spectra show clear evidence for the presence of conformational isomerism and this is supported by the calculations. Complete vibrational assignments for all four molecules are provided and this provides the essential information needed to generate structure/activity relationships for the sequential catalytic hydrogenation of 3-butyne-2-one to 2-butanol.
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Affiliation(s)
- Stewart F Parker
- ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK.
| | - Ian P Silverwood
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, Scotland, UK
| | - Neil G Hamilton
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, Scotland, UK
| | - David Lennon
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, Scotland, UK
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Palazzetti F, Maciel GS, Kanda K, Nakamura M, Che DC, Kasai T, Aquilanti V. Control of conformers combining cooling by supersonic expansion of seeded molecular beams with hexapole selection and alignment: experiment and theory on 2-butanol. Phys Chem Chem Phys 2014; 16:9866-75. [PMID: 24413635 DOI: 10.1039/c3cp54475c] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Selection and alignment of rotamers and, more in general, of conformers in the gas phase is a challenge that we tackle experimentally by supersonic expansion of seeded molecular beams and hexapolar electrostatic fields with quadrupole mass detection. The studied system involves the nine conformers of the asymmetric-top molecule 2-butanol, which coexist because of nearly free rotations around a CC and a CO bond. From the measured time-of-flight of a 2-butanol supersonic molecular beam seeded in either He or Ar, the corresponding velocity distributions are obtained. The different nature and masses of the seeding gas decrease selectively the vibrational temperature and determine the population of the conformers, which is assessed on the basis of their statistical distribution, derived from high level accompanying quantum mechanical calculations. The use of a hexapolar electrostatic field permits us to induce a variation of the population distribution as a function of the applied voltage and of the selective focusing and alignment of the conformers. A technique, recently developed for treating asymmetric tops and involving extensive trajectory simulations, is applied to obtain the link between the focusing curves, i.e. the dependence of the beam intensity on the hexapole voltage, and the conformers' populations and alignment. Perspectives are provided for photo- and stereo-dynamics experiments, particularly appealing also on account that 2-butanol is the simplest chiral alcohol.
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Nguyen HVL, Mouhib H, Klahm S, Stahl W, Kleiner I. A touch of lavender: gas-phase structure and dynamics of the monoterpene linalool validated by microwave spectroscopy. Phys Chem Chem Phys 2013; 15:10012-8. [DOI: 10.1039/c3cp50271f] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Zehnacker A, Suhm MA. Chirality recognition between neutral molecules in the gas phase. Angew Chem Int Ed Engl 2008; 47:6970-92. [PMID: 18696527 DOI: 10.1002/anie.200800957] [Citation(s) in RCA: 203] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Noncovalent interactions are particularly intriguing when they involve chiral molecules, because the interactions change in a subtle way upon replacing one of the partners by its mirror image. The resulting phenomena involving chirality recognition are relevant in the biosphere, in organic synthesis, and in polymer design. They may be classified according to the permanent or transient chirality of the interacting partners, leading to chirality discrimination, chirality induction, and chirality synchronization processes. For small molecules, high-level quantum chemical calculations for such processes are feasible. To provide reliable connections between theory and experiment, such phenomena are best studied in vacuum isolation at low temperature, using rotational, vibrational, electronic, and photoionization spectroscopy. We review these techniques and the results which have become available in recent years, with special emphasis on dimers of permanently chiral molecules and on the influence of conformational flexibility. Analogies between the microscopic mechanisms and macroscopic phenomena and between intra- and intermolecular cases are drawn.
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Affiliation(s)
- Anne Zehnacker
- CNRS, Laboratoire de Photophysique Moléculaire, UPR3361, Univ. Paris-Sud, 91405 Orsay, France.
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Zehnacker A, Suhm M. Chiralitätserkennung zwischen neutralen Molekülen in der Gasphase. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200800957] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Giuliano BM, Ottaviani P, Favero LB, Caminati W, Grabow JU, Giardini A, Satta M. Conformational preferences of chiral molecules: free jet rotational spectrum of 1-phenyl-1-propanol. Phys Chem Chem Phys 2007; 9:4460-4. [PMID: 17690771 DOI: 10.1039/b705114j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The rotational spectra of normal and O-d species of the two most stable conformers of chiral 1-phenyl-1-propanol, obtained by free jet millimetre-wave absorption spectroscopy reveal that both conformers are stabilized by a O-H[dot dot dot]pi interaction, and have the Calpha-Cbeta-bond oriented nearly perpendicular to the plane of the benzene ring. The methyl group is trans with respect to the phenyl group for the most stable conformer (T), while it is gauche with respect to the phenyl group and entgegen with respect to the hydroxyl group for the second most stable conformer (GE). The energy difference (E(GE)-E(T)) was estimated to be 50(50) cm(-1) from relative intensity measurements.
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Affiliation(s)
- Barbara M Giuliano
- Dipartimento di Chimica G. Ciamician dell' Università, Via Selmi 2, I-40126, Bologna, Italy
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Szydłowska I, Nosenko Y, Brutschy B, Tarakeshwar P, Herbich J. Supersonic jet studies of solvation effects on the spectroscopy and photophysics of 4-diethylaminopyridine. Phys Chem Chem Phys 2007; 9:4981-91. [PMID: 17851594 DOI: 10.1039/b705532c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We present the results of spectroscopic and photophysical investigations of 4-diethylaminopyridine (DEAP) and its 1 : 1 complexes with a number of protic solvents such as water and various alcohols of different acidity isolated under supersonic jet conditions. While a double resonance vibrational spectroscopic method was employed to investigate the size and geometrical structure of jet-cooled clusters, laser-induced fluorescence spectroscopy was used to examine the changes of photophysics induced by complexation of DEAP with solvent molecule(s). The results obtained from ab initio calculations enable the assignment of geometries and of the vibrational spectra of the clusters in the OH-stretch region. The comparison of the experimental and calculated vibrational spectra indicates that the solvent molecule is hydrogen-bonded to the pyridine nitrogen atom. Dual luminescence is observed only for the complexes with alcohols of relatively strong acidity.
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Affiliation(s)
- Izabela Szydłowska
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland
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Maris A, Caminati W, Velino B, Andrews CM, Howard BJ. Free and pulsed jet rotational spectra and van der Waals motions of ethanol⋯argon. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.09.131] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Lahmani F, Le Barbu-Debus K, Seurre N, Zehnacker-Rentien A. Laser spectroscopy of a chiral drug in a supersonic beam: conformation and complexation of S-(+)-Naproxen. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00933-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Lockley TJ, Hearn JI, King AK, Howard BJ. Detection and analysis of a new conformational isomer of propan-1,2-diol by Fourier transform microwave spectroscopy. J Mol Struct 2002. [DOI: 10.1016/s0022-2860(02)00090-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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