1
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Xie F, Mendolicchio M, Omarouayache W, Murugachandran SI, Lei J, Gou Q, Sanz ME, Barone V, Schnell M. Structural and Electronic Evolution of Ethanolamine upon Microhydration: Insights from Hyperfine Resolved Rotational Spectroscopy. Angew Chem Int Ed Engl 2024; 63:e202408622. [PMID: 38982982 DOI: 10.1002/anie.202408622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Revised: 06/21/2024] [Accepted: 06/21/2024] [Indexed: 07/11/2024]
Abstract
Ethanolamine hydrates containing from one to seven water molecules were identified via rotational spectroscopy with the aid of accurate quantum chemical methods considering anharmonic vibrational corrections. Ethanolamine undergoes significant conformational changes upon hydration to form energetically favorable hydrogen bond networks. The final structures strongly resemble the pure (H2O)3-9 complexes reported before when replacing two water molecules by ethanolamine. The 14N nuclear quadrupole coupling constants of all the ethanolamine hydrates have been determined and show a remarkable correlation with the strength of hydrogen bonds involving the amino group. After addition of the seventh water molecule, both hydrogen atoms of the amino group actively contribute to hydrogen bond formation, reinforcing the network and introducing approximately 21-27 % ionicity towards the formation of protonated amine. These findings highlight the critical role of microhydration in altering the electronic environment of ethanolamine, enhancing our understanding of amine hydration dynamics.
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Affiliation(s)
- Fan Xie
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
| | | | | | | | - Juncheng Lei
- Department of Chemistry, School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, 401331, Chongqing, China
| | - Qian Gou
- Department of Chemistry, School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, 401331, Chongqing, China
| | - M Eugenia Sanz
- Department of Chemistry, King's College London, London, SE1 1DB, U.K
| | | | - Melanie Schnell
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
- Institut für Physikalische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Str. 1, 24118, Kiel, Germany
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2
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Gupta S, Cummings CN, Walker NR, Arunan E. Microwave spectroscopic and computational analyses of the phenylacetylene⋯methanol complex: insights into intermolecular interactions. Phys Chem Chem Phys 2024; 26:19795-19811. [PMID: 38985163 DOI: 10.1039/d4cp01916d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2024]
Abstract
The microwave spectra of five isotopologues of phenylacetylene⋯methanol complex, C6H5CCH⋯CH3OH, C6H5CCH⋯CH3OD, C6H5CCH⋯CD3OD, C6H5CCD⋯CH3OH and C6H5CCH⋯13CH3OH, have been observed through Fourier transform microwave spectroscopy. Rotational spectra unambiguously unveil a specific structural arrangement characterised by dual interactions between the phenylacetylene and methanol. CH3OH serves as a hydrogen bond donor to the acetylenic π-cloud while concurrently accepting a hydrogen bond from the ortho C-H group of the PhAc moiety. The fitted rotational constants align closely with the structural configuration computed at the B3LYP-D3/aug-cc-pVDZ level of theory. The transitions of all isotopologues exhibit doublets owing to the methyl group's internal rotation within the methanol molecule. Comprehensive computational analyses, including natural bond orbital (NBO) analysis, atoms in molecules (AIM) theory, and non-covalent interactions (NCI) index plots, reveal the coexistence of both O-H⋯π and C-H⋯O hydrogen bonds within the complex. Symmetry adapted perturbation theory with density functional theory (SAPT-DFT) calculations performed on the experimentally determined geometry provide an insight into the prominent role of electrostatic interactions in stabilising the overall structural arrangement.
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Affiliation(s)
- Surabhi Gupta
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India.
| | - Charlotte N Cummings
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Bedson Building, Newcastle-upon-Tyne NE1 7RU, UK
| | - Nicholas R Walker
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Bedson Building, Newcastle-upon-Tyne NE1 7RU, UK
| | - Elangannan Arunan
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India.
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3
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Uribe L, Lazzari F, Di Grande S, Crisci L, Mendolicchio M, Barone V. Accurate structures and rotational constants of bicyclic monoterpenes at DFT cost by means of the bond-corrected Pisa composite scheme (BPCS). J Chem Phys 2024; 161:014307. [PMID: 38958160 DOI: 10.1063/5.0216384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Accepted: 06/17/2024] [Indexed: 07/04/2024] Open
Abstract
The structural, conformational, and spectroscopic properties in the gas phase of 20 bicyclic monoterpenes and monoterpenoids have been analyzed by a new accurate, reduced-cost computational strategy. In detail, the revDSD-PBEP86 double-hybrid functional in conjunction with the D3BJ empirical dispersion corrections and a suitable triple-zeta basis set provides accurate geometrical parameters, whence equilibrium rotational constants, which are further improved by proper account of core-valence correlation. Average deviations within 0.1% between computed and experimental rotational constants are reached when taking into account the vibrational corrections obtained by the B3LYP functional in conjunction with a double-zeta basis set in the framework of second-order vibrational perturbation theory. In addition to their intrinsic interest, the studied terpenes further extend the panel of systems for which the proposed strategy has provided accurate results at density functional theory cost. Therefore, a very accurate yet robust and user-friendly tool is now available for systematic investigations of the role of stereo-electronic effects on the properties of large systems of current technological and/or biological interest by experimentally oriented researchers.
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Affiliation(s)
- Lina Uribe
- Scuola Normale Superiore di Pisa, Piazza dei Cavalieri 7, 56126 Pisa, Italy
- Scuola Superiore Meridionale, Largo San Marcellino 10, 80138 Napoli, Italy
| | - Federico Lazzari
- Scuola Normale Superiore di Pisa, Piazza dei Cavalieri 7, 56126 Pisa, Italy
| | - Silvia Di Grande
- Scuola Normale Superiore di Pisa, Piazza dei Cavalieri 7, 56126 Pisa, Italy
- Scuola Superiore Meridionale, Largo San Marcellino 10, 80138 Napoli, Italy
| | - Luigi Crisci
- Scuola Normale Superiore di Pisa, Piazza dei Cavalieri 7, 56126 Pisa, Italy
| | - Marco Mendolicchio
- Scuola Normale Superiore di Pisa, Piazza dei Cavalieri 7, 56126 Pisa, Italy
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4
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Burevschi E, Chrayteh M, Murugachandran SI, Loru D, Dréan P, Sanz ME. Water Arrangements upon Interaction with a Rigid Solute: Multiconfigurational Fenchone-(H 2O) 4-7 Hydrates. J Am Chem Soc 2024; 146:10925-10933. [PMID: 38588470 PMCID: PMC11027134 DOI: 10.1021/jacs.4c01891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 03/19/2024] [Accepted: 03/20/2024] [Indexed: 04/10/2024]
Abstract
Insight into the arrangements of water molecules around solutes is important to understand how solvation proceeds and to build reliable models to describe water-solute interactions. We report the stepwise solvation of fenchone, a biogenic ketone, with 4-7 water molecules. Multiple hydrates were observed using broadband rotational spectroscopy, and the configurations of four fenchone-(H2O)4, three fenchone-(H2O)5, two fenchone-(H2O)6, and one fenchone-(H2O)7 complexes were characterized from the analysis of their rotational spectra in combination with quantum-chemical calculations. Interactions with fenchone deeply perturb water configurations compared with the pure water tetramer and pentamer. In two fenchone-(H2O)4 complexes, the water tetramer adopts completely new arrangements, and in fenchone-(H2O)5, the water pentamer is no longer close to being planar. The water hexamer interacts with fenchone as the least abundant book isomer, while the water heptamer adopts a distorted prism structure, which forms a water cube when including the fenchone oxygen in the hydrogen bonding network. Differences in hydrogen bonding networks compared with those of pure water clusters show the influence of fenchone's topology. Specifically, all observed hydrates except one show two water molecules binding to fenchone through each oxygen lone pair. The observation of several water arrangements for fenchone-(H2O)4-7 complexes highlights water adaptability and provides insight into the solvation process.
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Affiliation(s)
| | - Mhamad Chrayteh
- PhLAM—Physique
des Lasers, Atomes et Molécules, University of Lille, CNRS, UMR 8523, F-59000 Lille, France
| | | | - Donatella Loru
- Department
of Chemistry, King’s College London, London SE1 1DB, U.K.
| | - Pascal Dréan
- PhLAM—Physique
des Lasers, Atomes et Molécules, University of Lille, CNRS, UMR 8523, F-59000 Lille, France
| | - M. Eugenia Sanz
- Department
of Chemistry, King’s College London, London SE1 1DB, U.K.
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5
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Cummings CN, Walker NR. Hydrogen Bonding and Molecular Geometry in Isolated Hydrates of 2-Ethylthiazole Characterised by Microwave Spectroscopy. Chemphyschem 2024; 25:e202400011. [PMID: 38314654 DOI: 10.1002/cphc.202400011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 02/02/2024] [Accepted: 02/02/2024] [Indexed: 02/06/2024]
Abstract
Broadband microwave spectra of the isolated 2-ethylthiazole molecule, and complexes of 2-ethylthiazole⋅⋅⋅H2O and 2-ethylthiazole⋅⋅⋅(H2O)2 have been recorded by probing a gaseous sample containing low concentrations of 2-ethylthiazole and water within a carrier gas undergoing supersonic expansion. The identified conformer of the isolated 2-ethylthiazole molecule and the 2-ethylthiazole sub-unit within each of 2-ethylthiazole⋅⋅⋅H2O and 2-ethylthiazole⋅⋅⋅(H2O)2 have C1 symmetry. The angle that defines rotation of the ethyl group relative to the plane of the thiazole ring, ∠(S-C2-C6-C7), is -98.6(10)° within the isolated 2-ethylthiazole molecule. Analysis of molecular geometries and non-covalent interactions reveals each hydrate complex contains a non-linear primary, N⋅⋅⋅Hb-O, hydrogen bond between an O-H of H2O and the nitrogen atom while the O atom of the water molecule(s) interacts weakly with the ethyl group. The ∠(Hb⋅⋅⋅N-C2) parameter, which defines the position of the H2O molecule relative to the thiazole ring, is found to be significantly greater for 2-ethylthiazole⋅⋅⋅H2O than for thiazole⋅⋅⋅H2O. The distance between the O atoms is determined to be 2.894(21) Å within the dihydrate complex which is shorter than observed within the isolated water dimer. The primary hydrogen bond within 2-ethylthiazole⋅⋅⋅(H2O)2 is shorter and stronger than that in 2-ethylthiazole⋅⋅⋅H2O as a result of cooperative hydrogen bonding effects.
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Affiliation(s)
- Charlotte N Cummings
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Bedson, Building, NE1 7RU, U.K
| | - Nicholas R Walker
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Bedson, Building, NE1 7RU, U.K
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6
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Cummings C, Kleiner I, Walker NR. Noncovalent Interactions in the Molecular Geometries of 4-Methylthiazole···H 2O and 5-Methylthiazole···H 2O Revealed by Microwave Spectroscopy. J Phys Chem A 2023; 127:8133-8145. [PMID: 37751499 PMCID: PMC10561259 DOI: 10.1021/acs.jpca.3c05360] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 09/08/2023] [Indexed: 09/28/2023]
Abstract
The pure rotational spectra of 4-methylthiazole···H2O and 5-methylthiazole···H2O were recorded by chirped-pulse Fourier transform microwave (CP-FTMW) spectroscopy. Each complex was generated within the rotationally cold environment of a gas sample undergoing supersonic expansion in the presence of an argon buffer gas. The spectra of five isotopologues of each complex have been measured and analyzed to determine the rotational constants, A0, B0, and C0; centrifugal distortion constants, DJ, DJK, and d1; nuclear quadrupole coupling constants, χaa(N3) and [χbb(N3) - χcc(N3)]; and parameters describing the internal rotation of the CH3 group, V3 and ∠(i,b). The experimentally deduced parameters were obtained using the XIAM and the BELGI-Cs-hyperfine code. For each complex, parameters in the molecular geometry are fitted to experimentally determined moments of inertia. DFT calculations have been performed at the ωB97X-D/aug-cc-pVQZ level in support of the experiments. Each complex contains two hydrogen bonds; a comparatively strong, primary interaction between the N of thiazole and an O-H of H2O, and a weaker, secondary interaction between O and either the hydrogen atom attached to C2 (in 5-methylthiazole···H2O) or the CH3 group attached to C4 (in 4-methylthiazole···H2O). The barrier to internal rotation of the CH3 group, V3, is slightly lower for 4-methylthiazole···H2O (XIAM result is 340.05(56) cm-1) than that for the 4-methylthiazole monomer (357.6 cm-1). This is likely to be a result of internal charge redistribution within the 4-methylthiazole subunit following its coordination by H2O. At the precision of the experiments, V3 of 5-methylthiazole···H2O (XIAM result is 325.16(38) cm-1) is not significantly different from V3 of the 5-methylthiazole monomer (332.0 cm-1).
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Affiliation(s)
- Charlotte
N. Cummings
- Chemistry-
School of Natural and Environmental Sciences, Newcastle University, Bedson
Building, Newcastle-upon-Tyne, NE1 7RU, U.K.
| | - Isabelle Kleiner
- Université
de Paris and Université Paris Est Creteil, CNRS, LISA, F-75013 Paris, France
| | - Nicholas R. Walker
- Chemistry-
School of Natural and Environmental Sciences, Newcastle University, Bedson
Building, Newcastle-upon-Tyne, NE1 7RU, U.K.
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7
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Gougoula E, Cummings CN, Xu Y, Lu T, Feng G, Walker NR. Cooperative hydrogen bonding in thiazole⋯(H 2O) 2 revealed by microwave spectroscopy. J Chem Phys 2023; 158:114307. [PMID: 36948828 DOI: 10.1063/5.0143024] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023] Open
Abstract
Two isomers of a complex formed between thiazole and two water molecules, thi⋯(H2O)2, have been identified through Fourier transform microwave spectroscopy between 7.0 and 18.5 GHz. The complex was generated by the co-expansion of a gas sample containing trace amounts of thiazole and water in an inert buffer gas. For each isomer, rotational constants, A0, B0, and C0; centrifugal distortion constants, DJ, DJK, d1, and d2; and nuclear quadrupole coupling constants, χaa(N) and [χbb(N) - χcc(N)], have been determined through fitting of a rotational Hamiltonian to the frequencies of observed transitions. The molecular geometry, energy, and components of the dipole moment of each isomer have been calculated using Density Functional Theory (DFT). The experimental results for four isotopologues of isomer I allow for accurate determinations of atomic coordinates of oxygen atoms by r0 and rs methods. Isomer II has been assigned as the carrier of an observed spectrum on the basis of very good agreement between DFT-calculated results and a set of spectroscopic parameters (including A0, B0, and C0 rotational constants) determined by fitting to measured transition frequencies. Non-covalent interaction and natural bond orbital analyses reveal that two strong hydrogen bonding interactions are present within each of the identified isomers of thi⋯(H2O)2. The first of these binds H2O to the nitrogen of thiazole (OH⋯N), and the second binds the two water molecules (OH⋯O). A third, weaker interaction binds the H2O sub-unit to the hydrogen atom that is attached to C2 (for isomer I) or C4 (for isomer II) of the thiazole ring (CH⋯O).
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Affiliation(s)
- Eva Gougoula
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Bedson Building, Newcastle-upon-Tyne NE1 7RU, United Kingdom
| | - Charlotte N Cummings
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Bedson Building, Newcastle-upon-Tyne NE1 7RU, United Kingdom
| | - Yugao Xu
- School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, 401331 Chongqing, China
| | - Tao Lu
- School of Biology and Engineering (School of Modern Industry for Health and Medicine), Guiyang 550025, China
| | - Gang Feng
- School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, 401331 Chongqing, China
| | - Nicholas R Walker
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Bedson Building, Newcastle-upon-Tyne NE1 7RU, United Kingdom
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8
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Domingues J, Delgado F, Gonçalves JC, Zuzarte M, Duarte AP. Mediterranean Lavenders from Section Stoechas: An Undervalued Source of Secondary Metabolites with Pharmacological Potential. Metabolites 2023; 13:metabo13030337. [PMID: 36984777 PMCID: PMC10054607 DOI: 10.3390/metabo13030337] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 02/20/2023] [Accepted: 02/21/2023] [Indexed: 03/03/2023] Open
Abstract
Globally, climate change and wildfires are disrupting natural ecosystems, thus setting several endemic species at risk. The genus Lavandula is widely present in the Mediterranean region and its species, namely, those included in the section Stoechas, are valuable resources of active compounds with several biological assets. Since ancient times lavenders have been used in traditional medicine and for domestic purposes. These species are melliferous, decorative, and essential oil-producing plants with a high economic interest in the pharmaceutical, flavor, fragrance, and food industries. The essential oils of Lavandula section Stoechas are characterized by high amounts of 1,8-cineole, camphor, fenchone, and specifically for L. stoechas subsp. luisieri one of the major compounds is trans-α-necrodyl acetate. On the other hand, the diversity of non-volatile components like phenolic compounds, such as phenolic acids and flavonoids, make these species an important source of phytochemicals with pharmacological interest. Rosmarinic, caffeic, and salvianolic B acids are the major phenolic acids, and luteolin and eriodictyol-O-glucuronide are the main reported flavonoids. However, the concentration of these secondary metabolites is strongly affected by the plant’s phenological phase and varies in Lavandula sp. from different areas of origin. Indeed, lavender extracts have shown promising antioxidant, antimicrobial, anti-inflammatory, and anticancer properties as well as several other beneficial actions with potential for commercial applications. Despite several studies on the bioactive potential of lavenders from the section Stoechas, a systematized and updated review of their chemical profile is lacking. Therefore, we carried out the present review that gathers relevant information on the different types of secondary metabolites found in these species as well as their bioactive potential.
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Affiliation(s)
- Joana Domingues
- Plant Biotechnology Centre of Beira Interior (CBPBI), 6001-909 Castelo Branco, Portugal
- Health Sciences Research Centre (CICS), University of Beira Interior, 6200-506 Covilhã, Portugal
| | - Fernanda Delgado
- Plant Biotechnology Centre of Beira Interior (CBPBI), 6001-909 Castelo Branco, Portugal
- Polytechnic Institute of Castelo Branco-School of Agriculture (IPCB-ESA), 6001-909 Castelo Branco, Portugal
- Research Centre for Natural Resources, Environment and Society, Polytechnic Institute of Castelo Branco (CERNAS-IPCB), 6001-909 Castelo Branco, Portugal
| | - José Carlos Gonçalves
- Plant Biotechnology Centre of Beira Interior (CBPBI), 6001-909 Castelo Branco, Portugal
- Polytechnic Institute of Castelo Branco-School of Agriculture (IPCB-ESA), 6001-909 Castelo Branco, Portugal
- Research Centre for Natural Resources, Environment and Society, Polytechnic Institute of Castelo Branco (CERNAS-IPCB), 6001-909 Castelo Branco, Portugal
| | - Mónica Zuzarte
- Coimbra Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine, University of Coimbra, 3000-548 Coimbra, Portugal
- Center for Innovative Biomedicine and Biotechnology (CIBB), University of Coimbra, 3000-548 Coimbra, Portugal
- Clinical Academic Centre of Coimbra (CACC), 3004-531 Coimbra, Portugal
| | - Ana Paula Duarte
- Health Sciences Research Centre (CICS), University of Beira Interior, 6200-506 Covilhã, Portugal
- Faculty of Health Sciences, University of Beira Interior, 6200-506 Covilhã, Portugal
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9
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Baweja S, Antonelli E, Hussain S, Fernández-Ramos A, Kleiner I, Nguyen HVL, Sanz ME. Revealing Internal Rotation and 14N Nuclear Quadrupole Coupling in the Atmospheric Pollutant 4-Methyl-2-nitrophenol: Interplay of Microwave Spectroscopy and Quantum Chemical Calculations. Molecules 2023; 28:molecules28052153. [PMID: 36903397 PMCID: PMC10004196 DOI: 10.3390/molecules28052153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/17/2023] [Accepted: 02/17/2023] [Indexed: 03/02/2023] Open
Abstract
The structure and interactions of oxygenated aromatic molecules are of atmospheric interest due to their toxicity and as precursors of aerosols. Here, we present the analysis of 4-methyl-2-nitrophenol (4MNP) using chirped pulse and Fabry-Pérot Fourier transform microwave spectroscopy in combination with quantum chemical calculations. The rotational, centrifugal distortion, and 14N nuclear quadrupole coupling constants of the lowest-energy conformer of 4MNP were determined as well as the barrier to methyl internal rotation. The latter has a value of 106.4456(8) cm-1, significantly larger than those from related molecules with only one hydroxyl or nitro substituent in the same para or meta positions, respectively, as 4MNP. Our results serve as a basis to understand the interactions of 4MNP with atmospheric molecules and the influence of the electronic environment on methyl internal rotation barrier heights.
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Affiliation(s)
- Shefali Baweja
- Department of Chemistry, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, UK
| | - Eleonore Antonelli
- Université Paris Est Créteil and Université Paris Cité, CNRS, LISA, F-94010 Créteil, France
| | - Safia Hussain
- Department of Chemistry, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, UK
| | - Antonio Fernández-Ramos
- Departamento de Química Física and Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), Jenaro de la Fuente s/n, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Isabelle Kleiner
- Université Paris Cité and Université Paris Est Créteil, CNRS, LISA, F-75013 Paris, France
| | - Ha Vinh Lam Nguyen
- Université Paris Est Créteil and Université Paris Cité, CNRS, LISA, F-94010 Créteil, France
- Institut Universitaire de France (IUF), 1 rue Descartes, F-75231 Paris, France
- Correspondence: (H.V.L.N.); (M.E.S.)
| | - M. Eugenia Sanz
- Department of Chemistry, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, UK
- Correspondence: (H.V.L.N.); (M.E.S.)
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10
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Baweja S, Panchagnula S, Sanz ME, Evangelisti L, Pérez C, West C, Pate BH. Competition between In-Plane vs Above-Plane Configurations of Water with Aromatic Molecules: Non-Covalent Interactions in 1,4-Naphthoquinone-(H 2O) 1-3 Complexes. J Phys Chem Lett 2022; 13:9510-9516. [PMID: 36200782 PMCID: PMC9575146 DOI: 10.1021/acs.jpclett.2c02618] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 09/28/2022] [Indexed: 06/16/2023]
Abstract
Non-covalent interactions between aromatic molecules and water are fundamental in many chemical and biological processes, and their accurate description is essential to understand molecular relative configurations. Here we present the rotational spectroscopy study of the water complexes of the polycyclic aromatic hydrocarbon 1,4-naphthoquinone (1,4-NQ). In 1,4-NQ-(H2O)1,2, water molecules bind through O-H···O and C-H···O hydrogen bonds and are located on the plane of 1,4-NQ. For 1,4-NQ-(H2O)3, in-plane and above-plane water configurations are observed exhibiting O-H···O, C-H···O, and lone pair···π-hole interactions. The observation of different water arrangements for 1,4-NQ-(H2O)3 allows benchmarking theoretical methods and shows that they have great difficulty in predicting energy orderings due to the strong competition of C-H···O binding with π and π-hole interactions. This study provides important insight into water interactions with aromatic systems and the challenges in their modeling.
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Affiliation(s)
- Shefali Baweja
- Department
of Chemistry, King’s College London, 7 Trinity Street, London SE1 1DB, United Kingdom
| | - Sanjana Panchagnula
- Department
of Chemistry, King’s College London, 7 Trinity Street, London SE1 1DB, United Kingdom
| | - M. Eugenia Sanz
- Department
of Chemistry, King’s College London, 7 Trinity Street, London SE1 1DB, United Kingdom
| | - Luca Evangelisti
- Department
of Chemistry, University of Virginia, Charlottesville, Virginia 22904-4319, United States
| | - Cristóbal Pérez
- Department
of Chemistry, University of Virginia, Charlottesville, Virginia 22904-4319, United States
| | - Channing West
- Department
of Chemistry, University of Virginia, Charlottesville, Virginia 22904-4319, United States
| | - Brooks H. Pate
- Department
of Chemistry, University of Virginia, Charlottesville, Virginia 22904-4319, United States
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11
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Tsoi VWY, Burevschi E, Saxena S, Sanz ME. Conformational Panorama of Cycloundecanone: A Rotational Spectroscopy Study. J Phys Chem A 2022; 126:6185-6193. [PMID: 35998622 PMCID: PMC9483976 DOI: 10.1021/acs.jpca.2c04855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
The conformational landscape of the medium-size cyclic
ketone cycloundecanone
has been investigated using chirped-pulse Fourier transform microwave
spectroscopy and computational calculations. Nine conformations were
observed in the rotational spectrum and identified from the comparison
of experimental and theoretical rotational constants as well as the
observed and predicted types of rotational transitions. All singly
substituted 13C isotopologues were observed for the most
abundant conformer, which allowed the determination of partial substitution
and effective structures. The most abundant conformer dominates the
rotational spectrum and is almost 40 times more abundant than the
least abundant conformer. Conformational preferences are governed
by the combination of transannular H···H and eclipsed
HCCH interactions.
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Affiliation(s)
- Valerie W Y Tsoi
- Department of Chemistry, King's College London, London SE1 1DB, United Kingdom
| | - Ecaterina Burevschi
- Department of Chemistry, King's College London, London SE1 1DB, United Kingdom
| | - Shefali Saxena
- Department of Chemistry, King's College London, London SE1 1DB, United Kingdom
| | - M Eugenia Sanz
- Department of Chemistry, King's College London, London SE1 1DB, United Kingdom
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12
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Triptow J, Meijer G, Fielicke A, Dopfer O, Green M. Comparison of Conventional and Nonconventional Hydrogen Bond Donors in Au - Complexes. J Phys Chem A 2022; 126:3880-3892. [PMID: 35687835 PMCID: PMC9234979 DOI: 10.1021/acs.jpca.2c02725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Although gold has become a well-known nonconventional hydrogen bond acceptor, interactions with nonconventional hydrogen bond donors have been largely overlooked. In order to provide a better understanding of these interactions, two conventional hydrogen bonding molecules (3-hydroxytetrahydrofuran and alaninol) and two nonconventional hydrogen bonding molecules (fenchone and menthone) were selected to form gas-phase complexes with Au-. The Au-[M] complexes were investigated using anion photoelectron spectroscopy and density functional theory. Au-[fenchone], Au-[menthone], Au-[3-hydroxyTHF], and Au-[alaninol] were found to have vertical detachment energies of 2.71 ± 0.05, 2.76 ± 0.05, 3.01 ± 0.03, and 3.02 ± 0.03 eV, respectively, which agree well with theory. The photoelectron spectra of the complexes resemble the spectrum of Au- but are blueshifted due to the electron transfer from Au- to M. With density functional theory, natural bond orbital analysis, and atoms-in-molecules analysis, we were able to extend our comparison of conventional and nonconventional hydrogen bonding to include geometric and electronic similarities. In Au-[3-hydroxyTHF] and Au-[alaninol], the hydrogen bonding comprised of Au-···HO as a strong, primary hydrogen bond, with secondary stabilization by weaker Au-···HN or Au-···HC hydrogen bonds. Interestingly, the Au-···HC bonds in Au-[fenchone] and Au-[menthone] can be characterized as hydrogen bonds, despite their classification as nonconventional hydrogen bond donors.
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Affiliation(s)
- Jenny Triptow
- Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.,Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany
| | - Gerard Meijer
- Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - André Fielicke
- Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.,Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany
| | - Otto Dopfer
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany
| | - Mallory Green
- Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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13
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Gougoula E, Cummings CN, Medcraft C, Heitkämper J, Walker NR. Microwave spectra, molecular geometries, and internal rotation of CH 3 in N-methylimidazole⋯H 2O and 2-methylimidazole⋯H 2O Complexes. Phys Chem Chem Phys 2022; 24:12354-12362. [PMID: 35551286 PMCID: PMC9131724 DOI: 10.1039/d1cp05526g] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Broadband microwave spectra have been recorded between 7.0 and 18.5 GHz for N-methylimidazole⋯H2O and 2-methylimidazole⋯H2O complexes. Each complex was generated by co-expansion of low concentrations of methylimidazole and H2O in argon buffer gas. The rotational spectra of five isotopologues of each complex have been assigned and analysed to determine rotational constants (A0, B0, C0), centrifugal distortion constants (DJ, DJK) and parameters that describe the internal rotation of the CH3 group. The results allow the determination of parameters in the (r0) molecular geometry of each complex. H2O is the hydrogen bond donor and the pyridinic nitrogen of imidazole is the hydrogen bond acceptor in each case. The ∠(O–Hb⋯N3) angles are 177(5)° and 166.3(28)° for N-methylimidazole⋯H2O and 2-methylimidazole⋯H2O respectively. These results are consistent with the presence of a weak electrostatic interaction between the oxygen atom of H2O and the hydrogen atom (or CH3 group) attached to the C2 carbon atom of imidazole, and with the results of density functional theory calculations. The (V3) barrier to internal rotation of the CH3 group within N-methylimidazole⋯H2O is essentially unchanged from the value of this parameter for the N-methylimidazole monomer. The same parameter is significantly higher for the 2-methylimidazole⋯H2O complex than for the 2-methylimidazole monomer as a consequence of the weak electrostatic interaction between the O atom and the CH3 group of 2-methylimidazole. Broadband microwave spectra have been recorded between 7.0 and 18.5 GHz for N-methylimidazole⋯H2O and 2-methylimidazole⋯H2O complexes.![]()
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Affiliation(s)
- Eva Gougoula
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Charlotte N Cummings
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Bedson Building, Newcastle-upon-Tyne, NE1 7RU, UK.
| | - Chris Medcraft
- School of Chemistry, UNSW Sydney, Sydney, New South Wales 2052, Australia
| | - Juliane Heitkämper
- Institute of Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569, Stuttgart, Germany
| | - Nicholas R Walker
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Bedson Building, Newcastle-upon-Tyne, NE1 7RU, UK.
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14
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Vigorito A, Calabrese C, Maris A, Loru D, Peña I, Sanz ME, Melandri S. The Shapes of Sulfonamides: A Rotational Spectroscopy Study. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27092820. [PMID: 35566169 PMCID: PMC9101976 DOI: 10.3390/molecules27092820] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 04/24/2022] [Accepted: 04/26/2022] [Indexed: 11/23/2022]
Abstract
Benzenesulfonamides are a class of molecules of extreme interest in the biochemical field because many of them are active against a variety of diseases. In this work, the pharmacophoric group benzensulfonamide, its derivatives para-toluensulfonamide and ortho-toluensulfonamide, and the bioactive molecule sulfanilamide, were investigated using rotational spectroscopy to determine their conformations and the influence of different substituents on their structures. For all species, the hyperfine structure due to the 14N atom was analyzed, and this provided crucial information for the unambiguous identification of the observed conformation of all molecules. In addition, for ortho-toluensulfonamide, the vibration–rotation hyperfine structure related to the methyl torsion was analyzed, and the methyl group rotation barrier was determined. For benzensulfonamide, partial rS and r0 structures were established from the experimental rotational constants of the parent and two deuterated isotopic species. In all compounds except ortho-toluensulfonamide, the amino group of the sulfonamide group lies perpendicular to the benzene plane with the aminic hydrogens eclipsing the oxygen atoms. In ortho-toluensulfonamide, where weak attractive interactions occur between the nitrogen lone pair and the methyl hydrogen atoms, the amino group lies in a gauche orientation, retaining the eclipsed configuration with respect to the SO2 frame. A comparison of the geometrical arrangements found in the PDB database allowed us to understand that the bioactive conformations are different from those found in isolated conditions. The conformations within the receptor are reached with an energy cost, which is balanced by the interactions established in the receptor.
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Affiliation(s)
- Annalisa Vigorito
- Dipartimento di Chimica “G. Ciamician” dell’Università, via Selmi 2, I-40126 Bologna, Italy; (A.V.); (C.C.); (A.M.)
| | - Camilla Calabrese
- Dipartimento di Chimica “G. Ciamician” dell’Università, via Selmi 2, I-40126 Bologna, Italy; (A.V.); (C.C.); (A.M.)
| | - Assimo Maris
- Dipartimento di Chimica “G. Ciamician” dell’Università, via Selmi 2, I-40126 Bologna, Italy; (A.V.); (C.C.); (A.M.)
| | - Donatella Loru
- Department of Chemistry, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, UK; (D.L.); (I.P.); (M.E.S.)
| | - Isabel Peña
- Department of Chemistry, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, UK; (D.L.); (I.P.); (M.E.S.)
| | - M. Eugenia Sanz
- Department of Chemistry, King’s College London, Britannia House, 7 Trinity Street, London SE1 1DB, UK; (D.L.); (I.P.); (M.E.S.)
| | - Sonia Melandri
- Dipartimento di Chimica “G. Ciamician” dell’Università, via Selmi 2, I-40126 Bologna, Italy; (A.V.); (C.C.); (A.M.)
- Correspondence:
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15
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Mondelo-Martell M, Basilewitsch D, Braun H, Koch CP, Reich DM. Increasing ion yield circular dichroism in femtosecond photoionisation using optimal control theory. Phys Chem Chem Phys 2022; 24:9286-9297. [PMID: 35411352 DOI: 10.1039/d1cp05239j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We investigate how optimal control theory can be used to improve Circular Dichroism (CD) signals for the A-band of fenchone measured via the photoionization yield upon further excitation. These transitions are electric dipole forbidden to first order, which translates into low population transfer to the excited state but allows for a clearer interplay between electric and magnetic transition dipole moments, which are of the same order of magnitude. Using a model including the electronic ground and excited A state as well as all permanent and transition multipole moments up to the electric quadrupole, we find that the absolute CD signal of randomly oriented molecules can be increased by a factor of 2.5 when using shaped laser pulses, with the anisotropy parameter g increasing from 0.06 to 1. We find that this effect is caused by the interference between the excitation pathways prompted by the different multipole moments of the molecule.
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Affiliation(s)
- Manel Mondelo-Martell
- Dahlem Center of Complex Quantum Systems & Department of Physics, Freie Universität Berlin, Berlin, Germany.
| | - Daniel Basilewitsch
- Dahlem Center of Complex Quantum Systems & Department of Physics, Freie Universität Berlin, Berlin, Germany.
| | - Hendrike Braun
- Institute of Physics, Universität Kassel, Kassel, Germany.
| | - Christiane P Koch
- Dahlem Center of Complex Quantum Systems & Department of Physics, Freie Universität Berlin, Berlin, Germany.
| | - Daniel M Reich
- Dahlem Center of Complex Quantum Systems & Department of Physics, Freie Universität Berlin, Berlin, Germany.
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16
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Murugachandran SI, Sanz ME. Interactions of limonene with the water dimer. Phys Chem Chem Phys 2022; 24:26529-26538. [DOI: 10.1039/d2cp04174j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The interactions of limonene with the water dimer have been characterised through the identification of seven different isomers.
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Affiliation(s)
| | - M. Eugenia Sanz
- Department of Chemistry, King's College London, London, SE1 1DB, UK
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17
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Burevschi E, Peña I, Sanz ME. Geminal Diol Formation from the Interaction of a Ketone with Water in the Gas Phase: Structure and Reactivity of Cyclooctanone-(H 2O) 1,2 Clusters. J Phys Chem Lett 2021; 12:12419-12425. [PMID: 34939809 DOI: 10.1021/acs.jpclett.1c03493] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The hydration of ketones is known to occur in condensed phases, but it is not considered to be favorable in the gas phase due to restricted water content. We report the first evidence of geminal diol formation upon ketone hydration in the gas phase, obtained through the investigation of the interactions of cyclooctanone with water using broadband rotational spectroscopy. Oxygen-atom exchange between water and cyclooctanone was observed for two isomers of cyclooctanone-H2O and two isomers of cyclooctanone-(H2O)2. All complexes were unambiguously identified from the analysis of the rotational spectrum of the parent species and all their 13C and 18O isotopologues, and their heavy-atom substitution and effective structures were determined as well as their binding interactions. The production of gem-diols from gas-phase hydration of ketones has implications for atmospheric chemistry and opens a new channel for secondary aerosol formation.
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Affiliation(s)
| | - Isabel Peña
- Department of Chemistry, King's College London, London SE1 1DB, U.K
| | - M Eugenia Sanz
- Department of Chemistry, King's College London, London SE1 1DB, U.K
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18
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Chrayteh M, Burevschi E, Loru D, Huet TR, Dréan P, Sanz ME. Disentangling the complex network of non-covalent interactions in fenchone hydrates via rotational spectroscopy and quantum chemistry. Phys Chem Chem Phys 2021; 23:20686-20694. [PMID: 34515707 DOI: 10.1039/d1cp02995a] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The hydrates of the monoterpenoid fenchone (C10H16O)·(H2O)n (n = 1, 2, 3) were investigated by both computational chemistry and microwave spectroscopy. Two monohydrates, three dihydrates and for the first time three trihydrates were identified through the observation of the parent and 18O isotopologues in the rotational spectrum from 2 to 20 GHz. For each hydrate, the sets of rotational constants enabled the determination of the substitution coordinates of the oxygen water atoms as well as an effective structure accounting for the arrangement of the water molecules around fenchone. The hydrates consist of water chains anchored to fenchone by a -CO⋯H-O hydrogen bond and further stabilized by numerous -H-O⋯H-C- secondary hydrogen bonds with the alkyl hydrogen atoms of fenchone.
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Affiliation(s)
- Mhamad Chrayteh
- University of Lille, CNRS, UMR 8523 - PhLAM - Physique des Lasers, Atomes et Molécules, F-59000 Lille, France.
| | | | - Donatella Loru
- Department of Chemistry, King's College London, London, SE1 1DB, UK
| | - Thérèse R Huet
- University of Lille, CNRS, UMR 8523 - PhLAM - Physique des Lasers, Atomes et Molécules, F-59000 Lille, France.
| | - Pascal Dréan
- University of Lille, CNRS, UMR 8523 - PhLAM - Physique des Lasers, Atomes et Molécules, F-59000 Lille, France.
| | - M Eugenia Sanz
- Department of Chemistry, King's College London, London, SE1 1DB, UK
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19
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Chrayteh M, Huet TR, Dréan P. The gas-phase microwave spectrum of sabinene revisited reveals new structural parameters. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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20
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Burevschi E, Sanz ME. Seven Conformations of the Macrocycle Cyclododecanone Unveiled by Microwave Spectroscopy. Molecules 2021; 26:molecules26175162. [PMID: 34500596 PMCID: PMC8433831 DOI: 10.3390/molecules26175162] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/15/2021] [Accepted: 08/21/2021] [Indexed: 11/16/2022] Open
Abstract
The physicochemical properties and reactivity of macrocycles are critically shaped by their conformations. In this work, we have identified seven conformations of the macrocyclic ketone cyclododecanone using chirped-pulse Fourier transform microwave spectroscopy in combination with ab initio and density functional theory calculations. Cyclododecanone is strongly biased towards adopting a square configuration of the heavy atom framework featuring three C-C bonds per side. The substitution and effective structures of this conformation have been determined through the observation of its 13C isotopologues. The minimisation of transannular interactions and, to a lesser extent, HCCH eclipsed configurations drive conformational preferences. Our results contribute to a better understanding of the intrinsic forces mediating structural choices in macrocycles.
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21
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Murugachandran SI, Tang J, Peña I, Loru D, Sanz ME. New Insights into Secondary Organic Aerosol Formation: Water Binding to Limonene. J Phys Chem Lett 2021; 12:1081-1086. [PMID: 33471530 DOI: 10.1021/acs.jpclett.0c03574] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Limonene is an abundant monoterpene in the atmosphere and one of the main precursors of secondary organic aerosol. Understanding its interactions with atmospheric molecules is crucial to explain aerosol formation and the various products obtained from competing reaction pathways. Here, using broadband rotational spectroscopy in combination with computational calculations, we show that limonene effectively interacts with water, forming a variety of complexes. Seven different isomers of limonene-H2O, where water and limonene are connected by O-H···π and C-H···O interactions, have been unambiguously identified. Water has been found to preferentially bind to the endocyclic double bond of limonene. Our findings demonstrate a striking ability of water to attach to limonene and enrich our knowledge on the possible interactions of limonene in the atmosphere.
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Affiliation(s)
| | - Jackson Tang
- Department of Chemistry, King's College London, London SE1 1DB, U.K
| | - Isabel Peña
- Department of Chemistry, King's College London, London SE1 1DB, U.K
| | - Donatella Loru
- Department of Chemistry, King's College London, London SE1 1DB, U.K
| | - M Eugenia Sanz
- Department of Chemistry, King's College London, London SE1 1DB, U.K
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22
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Saxena S, Panchagnula S, Sanz ME, Pérez C, Evangelisti L, Pate BH. Structural Changes Induced by Quinones: High-Resolution Microwave Study of 1,4-Naphthoquinone. Chemphyschem 2020; 21:2579-2584. [PMID: 32954594 PMCID: PMC7756206 DOI: 10.1002/cphc.202000665] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 08/26/2020] [Indexed: 12/20/2022]
Abstract
1,4-Naphthoquinone (1,4-NQ) is an important product of naphthalene oxidation, and it appears as a motif in many biologically active compounds. We have investigated the structure of 1,4-NQ using chirped-pulse Fourier transform microwave spectroscopy and quantum chemistry calculations. The rotational spectra of the parent species, and its 13 C and 18 O isotopologues were observed in natural abundance, and their spectroscopic parameters were obtained. This allowed the determination of the substitution rs , mass-weighted rm and semi-experimental reSE structures of 1,4-NQ. The obtained structural parameters show that the quinone moiety mainly changes the structure of the benzene ring where it is inserted, modifying the C-C bonds to having predominantly single or double bond character. Furthermore, the molecular electrostatic surface potential reveals that the quinone ring becomes electron deficient while the benzene ring remains a nucleophile. The most electrophilic areas are the hydrogens attached to the double bond in the quinone ring. Knowledge of the nucleophilic and electrophilic areas in 1,4-NQ will help understanding its behaviour interacting with other molecules and guide modifications to tune its properties.
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Affiliation(s)
- Shefali Saxena
- Department of ChemistryKing's College LondonLondonUnited Kingdom
| | | | - M. Eugenia Sanz
- Department of ChemistryKing's College LondonLondonUnited Kingdom
| | - Cristóbal Pérez
- Department of ChemistryUniversity of VirginiaCharlottesvilleVAUSA
| | - Luca Evangelisti
- Department of ChemistryUniversity of VirginiaCharlottesvilleVAUSA
- Department of Chemistry “G. Ciamician”University of BolognaVia Selmi 2Bologna40126Italy
| | - Brooks H. Pate
- Department of ChemistryUniversity of VirginiaCharlottesvilleVAUSA
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23
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Nguyen HVL, Kleiner I. Understanding (coupled) large amplitude motions: the interplay of microwave spectroscopy, spectral modeling, and quantum chemistry. PHYSICAL SCIENCES REVIEWS 2020. [DOI: 10.1515/psr-2020-0037] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Abstract
A large variety of molecules contain large amplitude motions (LAMs), inter alia internal rotation and inversion tunneling, resulting in tunneling splittings in their rotational spectrum. We will present the modern strategy to study LAMs using a combination of molecular jet Fourier transform microwave spectroscopy, spectral modeling, and quantum chemical calculations to characterize such systems by the analysis of their rotational spectra. This interplay is particularly successful in decoding complex spectra revealing LAMs and providing reference data for fundamental physics, astrochemistry, atmospheric/environmental chemistry and analytics, or fundamental researches in physical chemistry. Addressing experimental key aspects, a brief presentation on the two most popular types of state-of-the-art Fourier transform microwave spectrometer technology, i.e., pulsed supersonic jet expansion–based spectrometers employing narrow-band pulse or broad-band chirp excitation, will be given first. Secondly, the use of quantum chemistry as a supporting tool for rotational spectroscopy will be discussed with emphasis on conformational analysis. Several computer codes for fitting rotational spectra exhibiting fine structure arising from LAMs are discussed with their advantages and drawbacks. Furthermore, a number of examples will provide an overview on the wealth of information that can be drawn from the rotational spectra, leading to new insights into the molecular structure and dynamics. The focus will be on the interpretation of potential barriers and how LAMs can act as sensors within molecules to help us understand the molecular behavior in the laboratory and nature.
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Affiliation(s)
- Ha Vinh Lam Nguyen
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), CNRS UMR 7583 , Université Paris-Est Créteil, Université de Paris, Institut Pierre Simon Laplace , 61 avenue du Général de Gaulle, F-94010 , Créteil , France
- Institut Universitaire de France (IUF) , 1 rue Descartes, F-75231 Paris cedex 05, France
| | - Isabelle Kleiner
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), CNRS UMR 7583 , Université Paris-Est Créteil, Université de Paris, Institut Pierre Simon Laplace , 61 avenue du Général de Gaulle, F-94010 , Créteil , France
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24
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Burevschi E, Alonso ER, Sanz ME. Binding Site Switch by Dispersion Interactions: Rotational Signatures of Fenchone-Phenol and Fenchone-Benzene Complexes. Chemistry 2020; 26:11327-11333. [PMID: 32428270 PMCID: PMC7497235 DOI: 10.1002/chem.202001713] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Indexed: 12/15/2022]
Abstract
Non-covalent interactions between molecules determine molecular recognition and the outcome of chemical and biological processes. Characterising how non-covalent interactions influence binding preferences is of crucial importance in advancing our understanding of these events. Here, we analyse the interactions involved in smell and specifically the effect of changing the balance between hydrogen-bonding and dispersion interactions by examining the complexes of the common odorant fenchone with phenol and benzene, mimics of tyrosine and phenylalanine residues, respectively. Using rotational spectroscopy and quantum chemistry, two isomers of each complex have been identified. Our results show that the increased weight of dispersion interactions in these complexes changes the preferred binding site in fenchone and sets the basis for a better understanding of the effect of different residues in molecular recognition and binding events.
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25
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Kastner A, Koumarianou G, Glodic P, Samartzis PC, Ladda N, Ranecky ST, Ring T, Vasudevan S, Witte C, Braun H, Lee HG, Senftleben A, Berger R, Park GB, Schäfer T, Baumert T. High-resolution resonance-enhanced multiphoton photoelectron circular dichroism. Phys Chem Chem Phys 2020; 22:7404-7411. [PMID: 32215414 DOI: 10.1039/d0cp00470g] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoelectron circular dichroism (PECD) is a highly sensitive enantiospecific spectroscopy for studying chiral molecules in the gas phase using either single-photon ionization or multiphoton ionization. In the short pulse limit investigated with femtosecond lasers, resonance-enhanced multiphoton ionization (REMPI) is rather instantaneous and typically occurs simultaneously via more than one vibrational or electronic intermediate state due to limited frequency resolution. In contrast, vibrational resolution in the REMPI spectrum can be achieved using nanosecond lasers. In this work, we follow the high-resolution approach using a tunable narrow-band nanosecond laser to measure REMPI-PECD through distinct vibrational levels in the intermediate 3s and 3p Rydberg states of fenchone. We observe the PECD to be essentially independent of the vibrational level. This behaviour of the chiral sensitivity may pave the way for enantiomer specific molecular identification in multi-component mixtures: one can specifically excite a sharp, vibrationally resolved transition of a distinct molecule to distinguish different chiral species in mixtures.
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Affiliation(s)
| | - Greta Koumarianou
- Institute of Electronic Structure and Lasers, Foundation for Research and Technology - Hellas (FORTH), P. O. Box 1527, 71110 Heraklion, Greece
| | - Pavle Glodic
- Institute of Electronic Structure and Lasers, Foundation for Research and Technology - Hellas (FORTH), P. O. Box 1527, 71110 Heraklion, Greece
| | - Peter C Samartzis
- Institute of Electronic Structure and Lasers, Foundation for Research and Technology - Hellas (FORTH), P. O. Box 1527, 71110 Heraklion, Greece
| | - Nicolas Ladda
- Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
| | - Simon T Ranecky
- Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
| | - Tom Ring
- Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
| | | | - Constantin Witte
- Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
| | - Hendrike Braun
- Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
| | - Han-Gyeol Lee
- Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
| | - Arne Senftleben
- Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
| | - Robert Berger
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany
| | - G Barratt Park
- Georg-August-Universität Göttingen, Tammannstr. 6, 37077 Göttingen, Germany. and Max Planck Institut für Biophysikalische Chemie, Am Fassberg 11, 37077 Göttingen, Germany
| | - Tim Schäfer
- Georg-August-Universität Göttingen, Tammannstr. 6, 37077 Göttingen, Germany. and Max Planck Institut für Biophysikalische Chemie, Am Fassberg 11, 37077 Göttingen, Germany
| | - Thomas Baumert
- Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
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26
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Quesada-Moreno MM, Krin A, Schnell M. Analysis of thyme essential oils using gas-phase broadband rotational spectroscopy. Phys Chem Chem Phys 2019; 21:26569-26579. [PMID: 31782453 DOI: 10.1039/c9cp05583e] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A semi-quantitative analysis of the components of two natural essential oils has been carried out using broadband rotational spectroscopy, which is inherently molecule specific. The samples under study were two thyme essential oils from Spain with different compositions: (a) with thymol as the most abundant species (thyme I) and (b) with linalool and 4-carvomenthenol being the most abundant ones (thyme II). Relative intensity measurements of selected rotational transitions were carried out to estimate the abundances of the different species present in these complex mixtures, taking into account the square of the respective dipole moment components. One strength of rotational spectroscopy is its structure sensitivity. Here, we also re-investigated the microwave spectrum of linalool and determined the accurate experimental gas-phase structures of thymol and linalool through the assignment of all 13C isotopologues of their lowest energy conformers. A characteristic splitting pattern of the rotational transitions due to internal rotation of two non-equivalent methyl groups of linalool was observed in the thyme II spectrum. Their internal rotation barriers were experimentally determined to 4.7703(96) kJ mol-1 and 9.2581(74) kJ mol-1, respectively.
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Loru D, Bermúdez MA, Sanz ME. Erratum: “Structure of fenchone by broadband rotational spectroscopy” [J. Chem. Phys. 145, 074311 (2016)]. J Chem Phys 2019; 151:209902. [DOI: 10.1063/1.5134906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Donatella Loru
- Department of Chemistry, King’s College London, London SE1 1DB, United Kingdom
| | - Miguel A. Bermúdez
- Department of Chemistry, King’s College London, London SE1 1DB, United Kingdom
| | - M. Eugenia Sanz
- Department of Chemistry, King’s College London, London SE1 1DB, United Kingdom
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Andresen M, Kleiner I, Schwell M, Stahl W, Nguyen HVL. Sensing the Molecular Structures of Hexan‐2‐one by Internal Rotation and Microwave Spectroscopy. Chemphyschem 2019; 20:2063-2073. [DOI: 10.1002/cphc.201900400] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 06/16/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Maike Andresen
- Institute of Physical ChemistryRWTH Aachen University Landoltweg 2 D-52074 Aachen Germany
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), CNRS UMR 7583, Université Paris-Est Créteil, Université de ParisInstitute Pierre Simon Laplace 61 avenue du Général de Gaulle F-94010 Créteil France
| | - Isabelle Kleiner
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), CNRS UMR 7583, Université Paris-Est Créteil, Université de ParisInstitute Pierre Simon Laplace 61 avenue du Général de Gaulle F-94010 Créteil France
| | - Martin Schwell
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), CNRS UMR 7583, Université Paris-Est Créteil, Université de ParisInstitute Pierre Simon Laplace 61 avenue du Général de Gaulle F-94010 Créteil France
| | - Wolfgang Stahl
- Institute of Physical ChemistryRWTH Aachen University Landoltweg 2 D-52074 Aachen Germany
| | - Ha Vinh Lam Nguyen
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), CNRS UMR 7583, Université Paris-Est Créteil, Université de ParisInstitute Pierre Simon Laplace 61 avenue du Général de Gaulle F-94010 Créteil France
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Loru D, Peña I, Sanz ME. The role of secondary interactions on the preferred conformers of the fenchone-ethanol complex. Phys Chem Chem Phys 2019; 21:2938-2945. [PMID: 30675879 DOI: 10.1039/c8cp06970k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New atomic-level experimental data on the intermolecular non-covalent interactions between a common odorant and a relevant residue at odorant binding sites are reported. The preferred arrangements and binding interactions of fenchone, a common odorant and ethanol, a mimic of serine's side chain, have been unambiguously identified using a combination of high resolution rotational spectroscopy and computational methods. The observed conformers include homochiral (RR) and heterochiral (RS) conformers, with a slight preference for a heterochiral form, and exhibit primary OH-O hydrogen bonds between fenchone and ethanol. Secondary interactions play a key role in determining the relative configurations of fenchone and ethanol, and in shaping quite a flat potential energy surface, with many conformers close in energy and small barriers for interconversion.
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Affiliation(s)
- Donatella Loru
- Department of Chemistry, King's College London, SE1 1DB London, UK.
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Riffe EJ, Shipman ST, Gaster SA, Funderburk CM, Brown GG. Rotational Spectrum of Eugenol As Analyzed with Double Resonance and Grid-Based Autofit. J Phys Chem A 2019; 123:1091-1099. [DOI: 10.1021/acs.jpca.8b09169] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Erika J. Riffe
- Division of Natural Sciences, New College of Florida, Sarasota, Florida 34243, United States
| | - Steven T. Shipman
- Division of Natural Sciences, New College of Florida, Sarasota, Florida 34243, United States
| | - Sydney A. Gaster
- Department of Science and Mathematics, Coker College, Hartsville, South Carolina 29550, United States
| | - Cameron M. Funderburk
- Department of Science and Mathematics, Coker College, Hartsville, South Carolina 29550, United States
| | - Gordon G. Brown
- Department of Science and Mathematics, Coker College, Hartsville, South Carolina 29550, United States
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Loru D, Vigorito A, Santos AFM, Tang J, Sanz ME. The axial/equatorial conformational landscape and intramolecular dispersion: new insights from the rotational spectra of monoterpenoids. Phys Chem Chem Phys 2019; 21:26111-26116. [DOI: 10.1039/c9cp05264j] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using rotational spectroscopy and quantum chemistry calculations, we show that intramolecular dispersion stabilises the axial conformers of monoterpenoids, and that an accurate account of these interactions is challenging for theoretical methods.
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Affiliation(s)
- Donatella Loru
- Department of Chemistry
- King's College London
- SE1 1DB London
- UK
| | | | | | - Jackson Tang
- Department of Chemistry
- King's College London
- SE1 1DB London
- UK
| | - M. Eugenia Sanz
- Department of Chemistry
- King's College London
- SE1 1DB London
- UK
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Burevschi E, Peña I, Sanz ME. Medium-sized rings: conformational preferences in cyclooctanone driven by transannular repulsive interactions. Phys Chem Chem Phys 2019; 21:4331-4338. [DOI: 10.1039/c8cp07322h] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Three conformers of cyclooctanone have been identified by broadband rotational spectroscopy. Cyclooctanone shows a strong preference to adopt a boat-chair conformation, driven by minimisation of repulsive non-bonded transannular interactions.
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Affiliation(s)
| | - Isabel Peña
- Department of Chemistry
- King's College London
- SE1 1DB London
- UK
| | - M. Eugenia Sanz
- Department of Chemistry
- King's College London
- SE1 1DB London
- UK
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Neeman EM, Avilés-Moreno JR, Huet TR. The quasi-unchanged gas-phase molecular structures of the atmospheric aerosol precursor β-pinene and its oxidation product nopinone. Phys Chem Chem Phys 2018; 19:13819-13827. [PMID: 28508899 DOI: 10.1039/c7cp01298e] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The rotational spectra of the two bicyclic molecules β-pinene and its oxidation product nopinone were investigated in the gas phase, using Fourier transform microwave spectroscopy coupled to a supersonic jet, in the 2-20 GHz range. The parent species and all heavy atom isotopologues have been observed in their natural abundance. The spectroscopic parameters of the ground states were determined from a Watson's Hamiltonian in the A reduction. The rotational constants were used together with geometrical parameters obtained from ab initio calculations to determine the r0 and r structures of the skeletons, without any structural assumption in the fit concerning the heavy atoms. Comparison with solid phase and other bicyclic monoterpenes unveiled an unprecedented complete set of geometrical parameters for the rigid cages. The structures of β-pinene and nopinone are very close, except for the substituents at C2. In the gas phase C2 is a centre of planarity in both molecules.
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Affiliation(s)
- E M Neeman
- Univ. Lille, CNRS, UMR 8523 - PhLAM - Physique des Lasers Atomes et Molécules, F-59000 Lille, France.
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Neeman EM, Huet TR. Identification of the maze in the conformational landscape of fenchol. Phys Chem Chem Phys 2018; 20:24708-24715. [DOI: 10.1039/c8cp04011g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The conformational landscape of the bicyclic molecule fenchol (C10H18O, 1,3,3-trimethylbicyclo[2.2.1]heptan-2-ol) – a biogenic volatile organic compound – was identified thanks to rotational spectroscopy and quantum chemical modelling.
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Affiliation(s)
- E. M. Neeman
- Univ. Lille
- CNRS, UMR 8523 – PhLAM – Physique des Lasers Atomes et Molécules
- F-59000 Lille
- France
| | - T. R. Huet
- Univ. Lille
- CNRS, UMR 8523 – PhLAM – Physique des Lasers Atomes et Molécules
- F-59000 Lille
- France
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Medcraft C, Gougoula E, Bittner DM, Mullaney JC, Blanco S, Tew DP, Walker NR, Legon AC. Molecular geometries and other properties of H2O⋯AgI and H3N⋯AgI as characterised by rotational spectroscopy and ab initio calculations. J Chem Phys 2017; 147:234308. [DOI: 10.1063/1.5008744] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Chris Medcraft
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Bedson Building, Newcastle-upon-Tyne NE1 7RU, United Kingdom
| | - Eva Gougoula
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Bedson Building, Newcastle-upon-Tyne NE1 7RU, United Kingdom
| | - Dror M. Bittner
- Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, Norfolk, Virginia 23529-0126, USA
| | - John C. Mullaney
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Bedson Building, Newcastle-upon-Tyne NE1 7RU, United Kingdom
| | - Susana Blanco
- Departamento de Quimica Fisica y Quimica Inorganica, Facultad de Ciencias, Universidad de Valladolid, 47011 Valladolid, Spain
| | - David P. Tew
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Nicholas R. Walker
- Chemistry-School of Natural and Environmental Sciences, Newcastle University, Bedson Building, Newcastle-upon-Tyne NE1 7RU, United Kingdom
| | - Anthony C. Legon
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
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Neeman EM, Avilés Moreno JR, Huet TR. The gas phase structure of α-pinene, a main biogenic volatile organic compound. J Chem Phys 2017; 147:214305. [DOI: 10.1063/1.5003726] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Affiliation(s)
- Elias M. Neeman
- University of Lille, CNRS, UMR 8523–PhLAM–Physique des Lasers Atomes et Molécules, F-59000 Lille, France
| | - Juan Ramón Avilés Moreno
- University of Lille, CNRS, UMR 8523–PhLAM–Physique des Lasers Atomes et Molécules, F-59000 Lille, France
- Department of Physical, Chemical, and Natural Systems, Universidad Pablo de Olavide, E-41013 Seville, Spain
| | - Thérèse R. Huet
- University of Lille, CNRS, UMR 8523–PhLAM–Physique des Lasers Atomes et Molécules, F-59000 Lille, France
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Licari D, Tasinato N, Spada L, Puzzarini C, Barone V. VMS-ROT: A New Module of the Virtual Multifrequency Spectrometer for Simulation, Interpretation, and Fitting of Rotational Spectra. J Chem Theory Comput 2017; 13:4382-4396. [PMID: 28742339 PMCID: PMC5636176 DOI: 10.1021/acs.jctc.7b00533] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The Virtual Multifrequency Spectrometer (VMS) is a tool that aims at integrating a wide range of computational and experimental spectroscopic techniques with the final goal of disclosing the static and dynamic physical-chemical properties "hidden" in molecular spectra. VMS is composed of two parts, namely, VMS-Comp, which provides access to the latest developments in the field of computational spectroscopy, and VMS-Draw, which provides a powerful graphical user interface (GUI) for an intuitive interpretation of theoretical outcomes and a direct comparison to experiment. In the present work, we introduce VMS-ROT, a new module of VMS that has been specifically designed to deal with rotational spectroscopy. This module offers an integrated environment for the analysis of rotational spectra: from the assignment of spectral transitions to the refinement of spectroscopic parameters and the simulation of the spectrum. While bridging theoretical and experimental rotational spectroscopy, VMS-ROT is strongly integrated with quantum-chemical calculations, and it is composed of four independent, yet interacting units: (1) the computational engine for the calculation of the spectroscopic parameters that are employed as a starting point for guiding experiments and for the spectral interpretation, (2) the fitting-prediction engine for the refinement of the molecular parameters on the basis of the assigned transitions and the prediction of the rotational spectrum of the target molecule, (3) the GUI module that offers a powerful set of tools for a vis-à-vis comparison between experimental and simulated spectra, and (4) the new assignment tool for the assignment of experimental transitions in terms of quantum numbers upon comparison with the simulated ones. The implementation and the main features of VMS-ROT are presented, and the software is validated by means of selected test cases ranging from isolated molecules of different sizes to molecular complexes. VMS-ROT therefore offers an integrated environment for the analysis of the rotational spectra, with the innovative perspective of an intimate connection to quantum-chemical calculations that can be exploited at different levels of refinement, as an invaluable support and complement for experimental studies.
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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
| | - Lorenzo Spada
- Scuola Normale Superiore , Piazza dei Cavalieri 7, I-56126 Pisa, Italy.,Dipartimento di Chimica "Giacomo Ciamician", Università di Bologna , Via Selmi 2, I-40126 Bologna, Italy
| | - Cristina Puzzarini
- Dipartimento di Chimica "Giacomo Ciamician", Università di Bologna , Via Selmi 2, I-40126 Bologna, Italy
| | - Vincenzo Barone
- Scuola Normale Superiore , Piazza dei Cavalieri 7, I-56126 Pisa, Italy
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Loru D, Quesada-Moreno MM, Avilés-Moreno JR, Jarman N, Huet TR, López-González JJ, Sanz ME. Conformational Flexibility of Limonene Oxide Studied By Microwave Spectroscopy. Chemphyschem 2016; 18:274-280. [DOI: 10.1002/cphc.201600991] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 11/17/2016] [Indexed: 01/11/2023]
Affiliation(s)
- Donatella Loru
- Department of Chemistry; King's College London; London United Kingdom
| | - María Mar Quesada-Moreno
- University of Jaen; Department of Physical and Analytical Chemistry; Campus Las Lagunillas E-23071 Jaen Spain
- PhLAM, UMR8523 CNRS-; Université Lille 1; Bâtiment P5 F-59655 Villeneuve D'Ascq Cedex France
| | | | - Natasha Jarman
- Department of Chemistry; King's College London; London United Kingdom
| | - Thérèse R. Huet
- PhLAM, UMR8523 CNRS-; Université Lille 1; Bâtiment P5 F-59655 Villeneuve D'Ascq Cedex France
| | - Juan Jesús López-González
- University of Jaen; Department of Physical and Analytical Chemistry; Campus Las Lagunillas E-23071 Jaen Spain
| | - M. Eugenia Sanz
- Department of Chemistry; King's College London; London United Kingdom
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