1
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Pinacho P, López JC, Kisiel Z, Blanco S. The effect of microsolvation on the structure, nuclear quadrupole coupling, and internal rotation: The methyl carbamate⋯(H2O)1-3 complexes. J Chem Phys 2024; 160:164315. [PMID: 38686817 DOI: 10.1063/5.0204953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Accepted: 04/03/2024] [Indexed: 05/02/2024] Open
Abstract
Microsolvation of the carbamate moiety delivers precise information on complexation effects on the N-C=O backbone and is of relevance to the peptide bond functionality. In this context, the mono-, di-, and trihydrated complexes of methyl carbamate have been studied in molecular expansion by high-resolution microwave spectroscopy, using chirped-pulse and Fabry-Perot resonator Fourier transform microwave instruments covering the frequency range from 2 to 18 GHz. From the rotational constants of the parent and the 18Ow substituted monoisotopologues, accurate values have been derived for the geometries of the hydrogen bond interactions. The nuclear quadrupole coupling constant χcc of the nitrogen nucleus provides a direct measure of complexation changes and decreases with the degree of hydration, whereas the hindered internal rotation barrier increases slightly with microsolvation. Both tendencies could have a common origin in the π-cooperative inductive effects as the microsolvation series progresses. All transitions are split by the internal rotation of the methyl top and the nuclear quadrupole coupling, and in the largest cluster, they are additionally split by an inversion motion.
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Affiliation(s)
- Pablo Pinacho
- Department of Physical Chemistry and Inorganic Chemistry, IU-CINQUIMA, University of Valladolid, Paseo Belen 7, Valladolid 47011, Spain
- Department of Physical Chemistry, University of the Basque Country (UPV/EHU), B. Sarriena, S/N, Leioa 48940, Spain
| | - Juan Carlos López
- Department of Physical Chemistry and Inorganic Chemistry, IU-CINQUIMA, University of Valladolid, Paseo Belen 7, Valladolid 47011, Spain
| | - Zbigniew Kisiel
- Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, Warsaw 02-668, Poland
| | - Susana Blanco
- Department of Physical Chemistry and Inorganic Chemistry, IU-CINQUIMA, University of Valladolid, Paseo Belen 7, Valladolid 47011, Spain
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2
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Macario A, López JC, Blanco S. Molecular Structure of Salicylic Acid and Its Hydrates: A Rotational Spectroscopy Study. Int J Mol Sci 2024; 25:4074. [PMID: 38612884 PMCID: PMC11012204 DOI: 10.3390/ijms25074074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 04/01/2024] [Accepted: 04/03/2024] [Indexed: 04/14/2024] Open
Abstract
We present a study of salicylic acid and its hydrates, with up to four water molecules, done by employing chirped-pulse Fourier transform microwave spectroscopy. We employed the spectral data set of the parent, 13C, and 2H isotopologues to determine the molecular structure and characterize the intra- and intermolecular interactions of salicylic acid and its monohydrate. Complementary theoretical calculations were done to support the analysis of the experimental results. For the monomer, we analyzed structural properties, such as the angular-group-induced bond alternation (AGIBA) effect. In the microsolvates, we analyzed their main structural features dominated by the interaction of water with the carboxylic acid group. This work contributes to seeding information on how water molecules accumulate around this group. Moreover, we discussed the role of cooperative effects further stabilizing the observed inter- and intramolecular hydrogen bond interactions.
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Affiliation(s)
- Alberto Macario
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, IU CINQUIMA, Universidad de Valladolid, 47011 Valladolid, Spain; (A.M.); (J.C.L.)
- Département de Physique Moléculaire, IPR (Institut de Physique de Rennes), CNRS-UMP 6251, Université de Rennes, F-35000 Rennes, France
| | - Juan Carlos López
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, IU CINQUIMA, Universidad de Valladolid, 47011 Valladolid, Spain; (A.M.); (J.C.L.)
| | - Susana Blanco
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, IU CINQUIMA, Universidad de Valladolid, 47011 Valladolid, Spain; (A.M.); (J.C.L.)
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3
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Salvitti G, Sigismondi S, Melandri S, López JC, Blanco S, Maris A. Structure and dynamics of 3'-aminoacetophenone and 4'-aminoacetophenone from rotational spectroscopy. Phys Chem Chem Phys 2024; 26:1881-1890. [PMID: 38175733 DOI: 10.1039/d3cp05608b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
The rotational spectra of 4'-aminoacetophenone, and those of two conformers (Z and E arrangement of the CO and NH2 groups) of 3'-aminoacetophenone and their 13C and 15N isotopologues were investigated both in the microwave (2-8 GHz) and millimetre (59.6-74.4 GHz) frequency regions using chirped pulse Fourier transform and free-jet absorption techniques, respectively. The spectra consist of μa and μb type lines that show a hyperfine structure due to both the nuclear quadrupole coupling of the 14N nucleus and the methyl internal rotation. Relative intensity measurements show that the Z form in 3'-aminoacetophenone is favoured with respect to E and the measured energy difference upper limit is about 5.5(1) kJ mol-1. Barriers to methyl internal rotation are V3 = 7.04(2) and 6.530(6) kJ mol-1 for 3'(Z)- and 4'-aminoacetophenone, respectively. Flexible model analyses of the amino inversion motion based on ab initio potential energy paths, suggest that the corresponding vibrational splitting increases up to 78% from aniline to 3'(E)-, 3'(Z), and 4-aminoacetophenone. However, due to supersonic expansion cooling, no splitting related to amine inversion is observed.
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Affiliation(s)
- Giovanna Salvitti
- Department of Chemistry G. Ciamician, University of Bologna, I-40126 Bologna, Italy.
| | - Silvia Sigismondi
- Department of Chemistry G. Ciamician, University of Bologna, I-40126 Bologna, Italy.
| | - Sonia Melandri
- Department of Chemistry G. Ciamician, University of Bologna, I-40126 Bologna, Italy.
| | - Juan Carlos López
- Department of Physical Chemistry and Inorganic Chemistry, IU-CINQUIMA, University of Valladolid, E-47011 Valladolid, Spain.
| | - Susana Blanco
- Department of Physical Chemistry and Inorganic Chemistry, IU-CINQUIMA, University of Valladolid, E-47011 Valladolid, Spain.
| | - Assimo Maris
- Department of Chemistry G. Ciamician, University of Bologna, I-40126 Bologna, Italy.
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4
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Pinacho P, Quesada-Moreno MM, Schnell M. Conformations of borneol and isoborneol in the gas phase: Their monomers and microsolvation clusters. J Chem Phys 2023; 159:194305. [PMID: 37975483 DOI: 10.1063/5.0168947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 10/09/2023] [Indexed: 11/19/2023] Open
Abstract
Borneol is a natural monoterpene with significant applications in various industries, including medicine and perfumery. It presents several diastereomers with different physical and chemical properties, influenced by their unique structures and interactions with molecular receptors. However, a complete description of its inherent structure and solvent interactions remains elusive. Here, we report a detailed investigation of the gas-phase experimental structures of borneol and isoborneol, along with the description of their microsolvation complexes with the common solvents water and dimethyl sulfoxide. The molecules and complexes were studied using chirped-pulse Fourier transform microwave spectroscopy coupled to a supersonic expansion source. Although three rotamers are potentially populated under the conditions of the supersonic expansion, only one of them was observed for each monomer. The examination of the monohydrated complexes revealed structures stabilized by hydrogen bonds and non-covalent C-H⋯O interactions, with water as the hydrogen bond donor. Interestingly, in the clusters with dimethyl sulfoxide, borneol and isoborneol change their roles acting as donors. We further identified a higher-energy rotamer of the borneol monomer in one of the complexes with dimethyl sulfoxide, while that rotamer was missing in the experiment for the monomer. This observation is not common and highlights a specific position in borneol especially favorable for forming stable complexes, which could have implications in the understanding of the unique physical and chemical properties of the diastereomers.
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Affiliation(s)
- Pablo Pinacho
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - María Mar Quesada-Moreno
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
- Departamento de Química Física y Analítica, Universidad de Jaén, Campus Las Lagunillas, 23071 Jaén, Spain
| | - Melanie Schnell
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
- Christian-Albrechts-Universität zu Kiel, Institut für Physikalische Chemie, Max-Eyth-Str. 1, 24118 Kiel, Germany
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5
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Loru D, Steber AL, Pérez C, Obenchain DA, Temelso B, López JC, Schnell M. Quantum Tunneling Facilitates Water Motion across the Surface of Phenanthrene. J Am Chem Soc 2023; 145:17201-17210. [PMID: 37494139 PMCID: PMC10416304 DOI: 10.1021/jacs.3c04281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Indexed: 07/28/2023]
Abstract
Quantum tunneling is a fundamental phenomenon that plays a pivotal role in the motion and interaction of atoms and molecules. In particular, its influence in the interaction between water molecules and carbon surfaces can have significant implications for a multitude of fields ranging from atmospheric chemistry to separation technologies. Here, we unveil at the molecular level the complex motion dynamics of a single water molecule on the planar surface of the polycyclic aromatic hydrocarbon phenanthrene, which was used as a small-scale carbon surface-like model. In this system, the water molecule interacts with the substrate through weak O-H···π hydrogen bonds, in which phenanthrene acts as the hydrogen-bond acceptor via the high electron density of its aromatic cloud. The rotational spectrum, which was recorded using chirped-pulse Fourier transform microwave spectroscopy, exhibits characteristic line splittings as dynamical features. The nature of the internal dynamics was elucidated in great detail with the investigation of the isotope-substitution effect on the line splittings in the rotational spectra of the H218O, D2O, and HDO isotopologues of the phenanthrene-H2O complex. The spectral analysis revealed a complex internal dynamic showing a concerted tunneling motion of water involving its internal rotation and its translation between the two equivalent peripheral rings of phenanthrene. This high-resolution spectroscopy study presents the observation of a tunneling motion exhibited by the water monomer when interacting with a planar carbon surface with an unprecedented level of detail. This can serve as a small-scale analogue for water motions on large aromatic surfaces, i.e., large polycyclic aromatic hydrocarbons and graphene.
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Affiliation(s)
- Donatella Loru
- Deutsches
Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Amanda L. Steber
- Deutsches
Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Cristóbal Pérez
- Deutsches
Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | | | - Berhane Temelso
- Division
of Information Technology, College of Charleston, Charleston, South Carolina 29424, United States
| | - Juan C. López
- Departamento
de Química Física y Química Inorgánica,
Facultad de Ciencias, Universidad de Valladolid, 47011 Valladolid, Spain
| | - Melanie Schnell
- Deutsches
Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
- Institut
für Physikalische Chemie, Christian-Albrechts-Universität
zu Kiel, Max-Eyth-Straße
1, D-24118 Kiel, Germany
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6
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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: 0] [Impact Index Per Article: 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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7
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Li J, Wang X, Zhang X, Chen J, Wang H, Tian X, Xu X, Gou Q. Stepwise hydrations of anhydride tuned by hydrogen bonds: rotational study on maleic anhydride-(H 2O) 1-3. Phys Chem Chem Phys 2023; 25:4611-4616. [PMID: 36723184 DOI: 10.1039/d2cp05861h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The rotational spectra of maleic anhydride-(H2O)1-3 have been investigated for the first time by using pulsed jet Fourier transform microwave spectroscopy with complementary computational analyses. The experimental evidence points out that water tends to self-aggregate with hydrogen bonds and form homodromic cycles. Differences in bond lengths and charge distribution between the two carbonyl sites have been observed upon stepwise hydrations, which might further introduce a selectivity on the nucleophilic attack sites of hydrolysis. This study provides an important insight into the incipient solvation process (microsolvation) of maleic anhydride in water by understanding the cooperation and rearrangement of intermolecular hydrogen bonds in its stepwise hydrates.
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Affiliation(s)
- Jiayi Li
- Department of Chemistry, School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, 401331, Chongqing, China.
| | - Xiujuan Wang
- Department of Chemistry, School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, 401331, Chongqing, China.
| | - Xinyue Zhang
- Department of Chemistry, School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, 401331, Chongqing, China.
| | - Junhua Chen
- Department of Chemistry, School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, 401331, Chongqing, China. .,School of Pharmacy, Guizhou Medical University, Guiyang, 550000, Guizhou, China
| | - Hao Wang
- Department of Chemistry, School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, 401331, Chongqing, China.
| | - Xiao Tian
- Department of Chemistry, School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, 401331, Chongqing, China.
| | - Xuefang Xu
- Department of Chemistry, School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, 401331, Chongqing, China.
| | - Qian Gou
- Department of Chemistry, School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, 401331, Chongqing, China.
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8
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López JC, Alkorta I, Macario A, Blanco S. Characterizing the n→π* interaction of pyridine with small ketones: a rotational study of pyridine⋯acetone and pyridine⋯2-butanone. Phys Chem Chem Phys 2022; 24:15484-15493. [PMID: 35713114 DOI: 10.1039/d2cp01611g] [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
Complexes formed by pyridine and small ketones such as acetone and 2-butanone have been generated in a supersonic jet and characterized by broadband Fourier transform microwave spectroscopy combined with high-level theoretical computations. The spectra of the complexes show a quadrupole coupling hyperfine structure due to the presence of a nitrogen atom and the splittings owing to the low barriers of the internal rotation of the methyl groups bonded to the carbonyl group. The corresponding barriers have been determined from the analysis of the spectra. We show in both complexes that pyridine closes a cycle with a ketone carbonyl group through an N⋯CO n→π* tetrel interaction and a C-H⋯O contact. The n→π* tetrel bond involves the pyridine N atom lone pair and the ketone carbonyl group with a geometry approaching the Bürgi-Dunitz trajectory for the nucleophilic attack to a carbonyl group.
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Affiliation(s)
- Juan Carlos López
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, IU CINQUIMA, Universidad de Valladolid, 47011 Valladolid, Spain.
| | - Ibon Alkorta
- Instituto de Química Médica (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain.
| | - Alberto Macario
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, IU CINQUIMA, Universidad de Valladolid, 47011 Valladolid, Spain.
| | - Susana Blanco
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, IU CINQUIMA, Universidad de Valladolid, 47011 Valladolid, Spain.
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9
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Perfluorination of Aromatic Compounds Reinforce Their van der Waals Interactions with Rare Gases: The Rotational Spectrum of Pentafluoropyridine-Ne. Molecules 2021; 27:molecules27010017. [PMID: 35011244 PMCID: PMC8746256 DOI: 10.3390/molecules27010017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 12/15/2021] [Accepted: 12/17/2021] [Indexed: 11/30/2022] Open
Abstract
The rotational spectrum of the pentafluoropyridine-Ne complex, generated in a supersonic jet, has been investigated using chirped-pulse microwave Fourier transform spectroscopy in the 2–8 GHz range. The spectra of the 20Ne and 22Ne species have been observed, and the rotational constants have been used to determine the structure of the complex. This structure, and those of the previously experimentally studied complexes benzene-Ne and pyridine-Ne, are an excellent benchmark for the theoretical calculations on these adducts. These complexes and hexafluorobenzene-Ne have been investigated at the CCSD/6-311++G(2d,p) level. The calculations reproduce the experimental structures well and show how the van der Waals complexes are stronger for the perfluorinated compound.
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10
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López JC, Macario A, Verde A, Pérez-Encabo A, Blanco S. Decoding the Structure of Non-Proteinogenic Amino Acids: The Rotational Spectrum of Jet-Cooled Laser-Ablated Thioproline. Molecules 2021; 26:molecules26247585. [PMID: 34946666 PMCID: PMC8715752 DOI: 10.3390/molecules26247585] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/10/2021] [Accepted: 12/12/2021] [Indexed: 01/17/2023] Open
Abstract
The broadband rotational spectrum of jet-cooled laser-ablated thioproline was recorded. Two conformers of this system were observed and identified with the help of DFT and ab initio computations by comparison of the observed and calculated rotational constants and 14N quadrupole coupling constants as well as the predicted energies compared to the observed relative populations. These conformers showed a mixed bent/twisted arrangement of the five-membered ring similar to that of the related compound thiazolidine with the N–H bond in axial configuration. The most stable form had the COOH group in an equatorial position on the same side of the ring as N-H. The arrangement of the C=O group close to the N-H bond led to a weak interaction between them (classified as type I) characterized by a noncovalent interaction analysis. The second form had a trans-COOH arrangement showing a type II O–H···N hydrogen bond. In thioproline, the stability of conformers of type I and type II was reversed with respect to proline. We show how the conformation of the ring depends on the function associated with the endocyclic N atom when comparing the structures of isolated thioproline with its zwitterion observed in condensed phases and with peptide forms.
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Affiliation(s)
- Juan Carlos López
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, IU CINQUIMA Universidad de Valladolid, 47011 Valladolid, Spain; (J.C.L.); or (A.M.); (A.V.)
| | - Alberto Macario
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, IU CINQUIMA Universidad de Valladolid, 47011 Valladolid, Spain; (J.C.L.); or (A.M.); (A.V.)
| | - Andrés Verde
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, IU CINQUIMA Universidad de Valladolid, 47011 Valladolid, Spain; (J.C.L.); or (A.M.); (A.V.)
| | - Alfonso Pérez-Encabo
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Valladolid, 47011 Valladolid, Spain;
| | - Susana Blanco
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, IU CINQUIMA Universidad de Valladolid, 47011 Valladolid, Spain; (J.C.L.); or (A.M.); (A.V.)
- Correspondence: ; Tel.: +34-983423272
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11
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Miyazaki M, Kamiya T, Wohlgemuth M, Chatterjee K, Mitrić R, Dopfer O, Fujii M. Real-time observation of photoionization-induced water migration dynamics in 4-methylformanilide-water by picosecond time-resolved infrared spectroscopy and ab initio molecular dynamics simulations. Phys Chem Chem Phys 2021; 24:73-85. [PMID: 34633007 DOI: 10.1039/d1cp03327a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A novel time-resolved pump-probe spectroscopic approach that enables to keep high resolution in both the time and energy domain, nanosecond excitation-picosecond ionization-picosecond infrared probe (ns-ps-ps TRIR) spectroscopy, has been applied to the trans-4-methylformanilide-water (4MetFA-W) cluster. Water migration dynamics from the CO to the NH binding site in a peptide linkage triggered by photoionization of 4MetFA-W is directly monitored by the ps time evolution of IR spectra, and the presence of an intermediate state is revealed. The time evolution is analyzed by rate equations based on a four-state model of the migration dynamics. Time constants for the initial to the intermediate and hot product and to the final product are obtained. The acceleration of the dynamics by methyl substitution and the strong contribution of intracluster vibrational energy redistribution in the termination of the solvation dynamics is suggested. This picture is well confirmed by the ab initio on-the-fly molecular dynamics simulations. Vibrational assignments of 4MetFA and 4MetFA-W in the neutral (S0 and S1) and ionic (D0) electronic states measured by ns IR dip and electron-impact IR photodissociation spectroscopy are also discussed prior to the results of time-resolved spectroscopy.
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Affiliation(s)
- Mitsuhiko Miyazaki
- Natural Science Division, Faculty of Core Research, Ochanomizu University, 2-1-1 Ohtsuka, Bunkyo-ku, Tokyo 112-8610, Japan. .,Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Tairiku Kamiya
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Matthias Wohlgemuth
- Institut für Physikalische und Theoretische Chemie, Julius-Maximilians-Universität Würzburg, 97074 Würzburg, Germany.
| | - Kuntal Chatterjee
- Institut für Optik und Atomare Physik, Technische Universität Berlin, 10623 Berlin, Germany.
| | - Roland Mitrić
- Institut für Physikalische und Theoretische Chemie, Julius-Maximilians-Universität Würzburg, 97074 Würzburg, Germany.
| | - Otto Dopfer
- Institut für Optik und Atomare Physik, Technische Universität Berlin, 10623 Berlin, Germany. .,World Research Hub Initiatives, Institute of Innovative Research, Tokyo Institute of Technology, 4259-R1-15, Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.
| | - Masaaki Fujii
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan.,World Research Hub Initiatives, Institute of Innovative Research, Tokyo Institute of Technology, 4259-R1-15, Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.
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12
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López JC, Macario A, Maris A, Alkorta I, Blanco S. How Aromatic Fluorination Exchanges the Interaction Role of Pyridine with Carbonyl Compounds: The Formaldehyde Adduct. Chemistry 2021; 27:13870-13878. [PMID: 34347915 PMCID: PMC8518414 DOI: 10.1002/chem.202102163] [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: 06/18/2021] [Indexed: 11/11/2022]
Abstract
The rotational spectrum of the weakly bound complex pentafluoropyridine⋅⋅⋅formaldehyde has been investigated using Fourier transform microwave spectroscopy. From the analysis of the rotational parameters of the parent species and of the 13 C and 15 N isotopologues, the structural arrangement of the adduct has been unambiguously established. The full ring fluorination of pyridine has a dramatic effect on its binding properties: It alters the electron density distribution at the π-cloud of pyridine creating a π-hole and changing its electron donor-acceptor capabilities. In the complex, formaldehyde lies above the aromatic ring with one of the oxygen lone pairs, as conventionally envisaged, pointing toward its centre. This lone pair⋅⋅⋅π-hole interaction, reinforced by a weak C-H⋅⋅⋅N interaction, indicates an exchange of the electron-acceptor roles of both molecules when compared to the pyridine⋅⋅⋅formaldehyde adduct. Tunnelling doublets due to the internal rotation of formaldehyde have also been observed and analysed leading to a discussion on the competition between lone pair⋅⋅⋅π-hole and π⋅⋅⋅π stacking interactions.
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Affiliation(s)
- Juan Carlos López
- Departamento de Química Física y Química InorgánicaFacultad de CienciasIU CINQUIMAUniversidad de Valladolid47011ValladolidSpain
| | - Alberto Macario
- Departamento de Química Física y Química InorgánicaFacultad de CienciasIU CINQUIMAUniversidad de Valladolid47011ValladolidSpain
| | - Assimo Maris
- Dipartimento di Chimica “G. Ciamician”Università di BolognaVia Selmi 2I-40126BolognaItaly
| | - Ibon Alkorta
- Instituto de Química Médica (CSIC)Juan de la Cierva 328006MadridSpain
| | - Susana Blanco
- Departamento de Química Física y Química InorgánicaFacultad de CienciasIU CINQUIMAUniversidad de Valladolid47011ValladolidSpain
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Blanco S, Macario A, López JC. The structure of isolated thalidomide as reference for its chirality-dependent biological activity: a laser-ablation rotational study. Phys Chem Chem Phys 2021; 23:13705-13713. [PMID: 34128013 DOI: 10.1039/d1cp01691a] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Thalidomide is a drug that presents two enantiomers with markedly different pharmacological and toxicological activities. It is sadly famous due to its teratogenic effects mostly caused by the preferential docking of the (S)-enantiomer to the target protein cereblon (CRBN). To compare the structure of the bound CRBN thalidomide enantiomers with that of the isolated molecule, the rotational spectrum of laser-ablated thalidomide has been studied by chirp-pulsed Fourier transform microwave spectroscopy in supersonic jets complemented by theoretical computations. A new setup of the laser ablation nozzle used is presented. Two stable equatorial and axial conformers of thalidomide have been predicted corresponding to the two possible bent conformations exhibited by the glutarimide moiety. Only the most stable equatorial conformer has been detected. The comparison of its structure with those of the (S)- and (R)-enantiomers bound to CBRN shows that the bound (S) species is only slightly distorted. On the contrary, the bound (R)-enantiomer exhibits a highly distorted structure which affects the degree of puckering of the glutarimide ring and especially to the orientation of the phtalimide and glutarimide subunits. This is consistent with a less stable (R)-enantiomer and the known preference of (S)-thalidomide to bind CRBN, which starts the process leading to teratogenic effects.
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Affiliation(s)
- Susana Blanco
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, IU CINQUIMA, Universidad de Valladolid, 47011 Valladolid, Spain.
| | - Alberto Macario
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, IU CINQUIMA, Universidad de Valladolid, 47011 Valladolid, Spain.
| | - Juan Carlos López
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias, IU CINQUIMA, Universidad de Valladolid, 47011 Valladolid, Spain.
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Blanco S, Macario A, García‐Calvo J, Revilla‐Cuesta A, Torroba T, López JC. Microwave Detection of Wet Triacetone Triperoxide (TATP): Non‐Covalent Forces and Water Dynamics. Chemistry 2020; 27:1680-1687. [DOI: 10.1002/chem.202003499] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 09/16/2020] [Indexed: 11/07/2022]
Affiliation(s)
- Susana Blanco
- Departamento de Química Física y Química Inorgánica Facultad de Ciencias, IU CINQUIMA Universidad de Valladolid 47011 Valladolid Spain
| | - Alberto Macario
- Departamento de Química Física y Química Inorgánica Facultad de Ciencias, IU CINQUIMA Universidad de Valladolid 47011 Valladolid Spain
| | - José García‐Calvo
- Departamento de Química Facultad de Ciencias Universidad de Burgos 09001 Burgos Spain
| | - Andrea Revilla‐Cuesta
- Departamento de Química Facultad de Ciencias Universidad de Burgos 09001 Burgos Spain
| | - Tomas Torroba
- Departamento de Química Facultad de Ciencias Universidad de Burgos 09001 Burgos Spain
| | - Juan Carlos López
- Departamento de Química Física y Química Inorgánica Facultad de Ciencias, IU CINQUIMA Universidad de Valladolid 47011 Valladolid Spain
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Pinacho P, López JC, Kisiel Z, Blanco S. Microsolvation of ethyl carbamate conformers: effect of carrier gas on the formation of complexes. Phys Chem Chem Phys 2020; 22:18351-18360. [DOI: 10.1039/d0cp03093g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Microsolvated complexes of ethyl carbamate (urethane) with up to three water molecules formed in a supersonic expansion have been characterized by high-resolution microwave spectroscopy.
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Affiliation(s)
- Pablo Pinacho
- Departamento de Química Física y Química Inorgánica
- Facultad de Ciencias, Universidad de Valladolid
- E-47011 Valladolid
- Spain
| | - Juan Carlos López
- Departamento de Química Física y Química Inorgánica
- Facultad de Ciencias, Universidad de Valladolid
- E-47011 Valladolid
- Spain
| | | | - Susana Blanco
- Departamento de Química Física y Química Inorgánica
- Facultad de Ciencias, Universidad de Valladolid
- E-47011 Valladolid
- Spain
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Pinacho P, López JC, Kisiel Z, Blanco S. Structure of Butyl Carbamate and of Its Water Complex in the Gas Phase. J Phys Chem A 2019; 123:7983-7990. [PMID: 31461275 DOI: 10.1021/acs.jpca.9b06638] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structure of butyl carbamate and of its complex with water generated in a supersonic expansion has been characterized by Fourier transform microwave spectroscopy. Up to 13 low-energy conformations of the monomer have been predicted that differ in the relative orientation of the butyl chain and the amide group. However, only three conformations have been observed experimentally. The remaining low-energy conformers are expected to interconvert into the observed rotamers through collisional relaxation processes in the supersonic jet. The values of the C-O-Cα-Cβ dihedral angle observed for the two most stable conformers of butyl carbamate, with extended configurations, can be directly correlated with the values of this angle in the two experimentally observed conformers of the shorter-chain molecule, ethyl carbamate. The less stable form shows a weak C-H···O═C intramolecular hydrogen bond from the terminal methyl group to the carbamate C═O group, stabilizing a folded configuration. For the most stable butyl carbamate monomer the complex with one molecule of water has been observed. In that complex the water molecule attaches to the amide group in a cyclic arrangement using two hydrogen bonds. The results indicate that water does not substantially alter the conformational behavior of butyl carbamate.
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Affiliation(s)
- Pablo Pinacho
- Departamento de Química Física y Química Inorgánica, IU CINQUIMA, Facultad de Ciencias , Universidad de Valladolid , E-47011 Valladolid , Spain
| | - Juan Carlos López
- Departamento de Química Física y Química Inorgánica, IU CINQUIMA, Facultad de Ciencias , Universidad de Valladolid , E-47011 Valladolid , Spain
| | - Zbigniew Kisiel
- Institute of Physics , Polish Academy of Sciences , Warsaw , Poland
| | - Susana Blanco
- Departamento de Química Física y Química Inorgánica, IU CINQUIMA, Facultad de Ciencias , Universidad de Valladolid , E-47011 Valladolid , Spain
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Macario A, Blanco S, Thomas J, Xu Y, López JC. Competition Between Intra- and Intermolecular Hydrogen Bonding: o-Anisic Acid⋅⋅⋅Formic Acid Heterodimer. Chemistry 2019; 25:12325-12331. [PMID: 31251419 DOI: 10.1002/chem.201902086] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 06/21/2019] [Indexed: 11/11/2022]
Abstract
Four conformers of the heterodimer o-anisic acid-formic acid, formed in a supersonic expansion, have been probed by Fourier transform microwave spectroscopy. Two of these forms have the typical double intermolecular hydrogen-bond cyclic structure. The other two show the o-anisic acid moiety bearing a trans-COOH arrangement supported by an intramolecular O-H⋅⋅⋅O bond to the neighbor methoxy group. In these conformers, formic acid interacts with o-anisic acid mainly through an intermolecular O-H⋅⋅⋅O hydrogen bond either to the O-H or to the C=O moieties, reinforced by other weak interactions. Surprisingly, the most abundant conformer in the supersonic expansion is the complex in which the o-anisic acid is in trans arrangement with the formic acid interacting with the O-H group. Such a trans-COOH arrangement in which the intramolecular hydrogen bond dominates over the usually observed double intermolecular hydrogen bond interaction has never been observed previously in an acid-acid dimer.
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Affiliation(s)
- Alberto Macario
- Dpto. Química FísicayQuímica Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo Belén 7, 47011, Valladolid, Spain
| | - Susana Blanco
- Dpto. Química FísicayQuímica Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo Belén 7, 47011, Valladolid, Spain
| | - Javix Thomas
- Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
| | - Yunjie Xu
- Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
| | - Juan Carlos López
- Dpto. Química FísicayQuímica Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo Belén 7, 47011, Valladolid, Spain
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Macario A, Blanco S, Thomas J, Xu Y, López JC. Conformational Landscape of m-Anisic Acid and Its Complexes with Formic Acid. J Phys Chem A 2019; 123:6772-6780. [DOI: 10.1021/acs.jpca.9b05295] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Alberto Macario
- Dpto. Química Física y Química Inorgánica, Facultad de Ciencias, IU Cinquima, Universidad de Valladolid, Paseo Belén 7, 47011 Valladolid, Spain
| | - Susana Blanco
- Dpto. Química Física y Química Inorgánica, Facultad de Ciencias, IU Cinquima, Universidad de Valladolid, Paseo Belén 7, 47011 Valladolid, Spain
| | - Javix Thomas
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6G 2G2
| | - Yunjie Xu
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada, T6G 2G2
| | - Juan Carlos López
- Dpto. Química Física y Química Inorgánica, Facultad de Ciencias, IU Cinquima, Universidad de Valladolid, Paseo Belén 7, 47011 Valladolid, Spain
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