1
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Metya S, Roy S, Mandal S, Huang QR, Kuo JL, Das A. Modulation of the strength of weak S-H⋯O hydrogen-bond: Spectroscopic study of the complexes of 2-flurothiophenol with methanol and ethanol. J Chem Phys 2024; 160:224302. [PMID: 38856058 DOI: 10.1063/5.0208086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Accepted: 05/27/2024] [Indexed: 06/11/2024] Open
Abstract
Spectroscopic exploration of sulfur-centered hydrogen bonding involving a thiol group (S-H) as the hydrogen bond donor is scarce in the literature. Herein, we have investigated 1:1 complexes of 2-fluorothiophenol (2-FTP) with methanol (MeOH) and ethanol (EtOH) in the gas phase to examine the physical characteristics and strength of the S-H⋯O hydrogen bond. Structures, conformations, and the strength of the S-H⋯O interaction are investigated by measuring the electronic and Infrared (IR) spectra of the two complexes employing resonant two-photon ionization, UV-UV hole-burning, and IR-UV double resonance spectroscopic techniques combined with quantum chemical calculations. Three conformers of 2-FTP⋯MeOH and two conformers of 2-FTP⋯EtOH have been detected in the experiment. A comparison of the IR spectra obtained from the experiment with those of the low-energy conformers of 2-FTP⋯MeOH and 2-FTP⋯EtOH predicted from the theory confirms that all the observed conformers of the two complexes are primarily S-H⋯O hydrogen bonded. The IR red-shifts found in the S-H stretching frequencies in 2-FTP⋯MeOH and 2-FTP⋯EtOH concerning that in 2-FTP are ∼76 and ∼88 cm-1, respectively, which are much larger than that was reported earlier in the 2-FTP⋯H2O complex (30 cm-1). The strength and physical nature of different noncovalent interactions, including the S-H⋯O hydrogen bond existing in the complexes, are further analyzed using natural bond orbital analysis, quantum theory of atoms in molecules, and localized molecular orbital-energy decomposition analysis. The current investigation reveals that the S-H⋯O hydrogen bond can be strengthened by judicial choices of the hydrogen bond acceptors of higher proton affinities.
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Affiliation(s)
- Surajit Metya
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
| | - Supravat Roy
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
| | - Sourav Mandal
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
| | - Qian-Rui Huang
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan
| | - Jer-Lai Kuo
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan
| | - Aloke Das
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
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2
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Torres-Hernández F, Pinillos P, Li W, Saragi RT, Camiruaga A, Juanes M, Usabiaga I, Lesarri A, Fernández JA. Competition between O-H and S-H Intermolecular Interactions in Conformationally Complex Systems: The 2-Phenylethanethiol and 2-Phenylethanol Dimers. J Phys Chem Lett 2024; 15:5674-5680. [PMID: 38767855 PMCID: PMC11145646 DOI: 10.1021/acs.jpclett.4c00903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 05/15/2024] [Accepted: 05/16/2024] [Indexed: 05/22/2024]
Abstract
Noncovalent interactions involving sulfur centers play a relevant role in biological and chemical environments. Yet, detailed molecular descriptions are scarce and limited to very simple model systems. Here we explore the formation of the elusive S-H···S hydrogen bond and the competition between S-H···O and O-H···S interactions in pure and mixed dimers of the conformationally flexible molecules 2-phenylethanethiol (PET) and 2-phenylethanol (PEAL), using the isolated and size-controlled environment of a jet expansion. The structure of both PET-PET and PET-PEAL dimers was unraveled through a comprehensive methodology that combined rotationally resolved microwave spectroscopy, mass-resolved isomer-specific infrared laser spectroscopy, and quantum chemical calculations. This synergic experimental-computational approach offered unique insights into the potential energy surface, conformational equilibria, molecular structure, and intermolecular interactions of the dimers. The results show a preferential order for establishing hydrogen bonds following the sequence S-H···S < S-H···O ≲ O-H···S < O-H···O, despite the hydrogen bond only accounting for a fraction of the total interaction energy.
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Affiliation(s)
- Fernando Torres-Hernández
- Departamento
de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Barrio Sarriena s/n, Leioa 48940, Spain
| | - Paul Pinillos
- Departamento
de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Barrio Sarriena s/n, Leioa 48940, Spain
| | - Wenqin Li
- Departamento
de Química Física y Química Inorgánica,
Facultad de Ciencias - I.U. CINQUIMA, Universidad
de Valladolid, Paseo de Belén, 7, E-47011 Valladolid, Spain
| | - Rizalina Tama Saragi
- Departamento
de Química Física y Química Inorgánica,
Facultad de Ciencias - I.U. CINQUIMA, Universidad
de Valladolid, Paseo de Belén, 7, E-47011 Valladolid, Spain
| | - Ander Camiruaga
- Departamento
de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Barrio Sarriena s/n, Leioa 48940, Spain
| | - Marcos Juanes
- Departamento
de Química Física y Química Inorgánica,
Facultad de Ciencias - I.U. CINQUIMA, Universidad
de Valladolid, Paseo de Belén, 7, E-47011 Valladolid, Spain
| | - Imanol Usabiaga
- Departamento
de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Barrio Sarriena s/n, Leioa 48940, Spain
| | - Alberto Lesarri
- Departamento
de Química Física y Química Inorgánica,
Facultad de Ciencias - I.U. CINQUIMA, Universidad
de Valladolid, Paseo de Belén, 7, E-47011 Valladolid, Spain
| | - José A. Fernández
- Departamento
de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), Barrio Sarriena s/n, Leioa 48940, Spain
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3
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Tama Saragi R, Li W, Juanes M, Enríquez L, Pinacho R, Rubio JE, Lesarri A. Rotational Spectroscopy and Conformational Flexibility of 2-Phenylethanethiol: The Dominant S-H⋅⋅⋅π Intramolecular Hydrogen Bond. Chemphyschem 2024; 25:e202300799. [PMID: 38282167 DOI: 10.1002/cphc.202300799] [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: 10/27/2023] [Revised: 01/19/2024] [Accepted: 01/23/2024] [Indexed: 01/30/2024]
Abstract
We present a rotational-computational investigation of the aromatic mercaptan 2-phenylethanethiol, addressing its potential energy surface, conformational equilibrium, internal dynamics and intramolecular interactions. The experiment used broadband chirped-pulse Fourier transform microwave spectroscopy in a supersonic jet expansion, recording the rotational spectrum in the 2-8 GHz frequency region. Two different conformers were detected in the spectrum. The most intense transitions correspond to a skew (gauche-gauche) conformation, identified as the global minimum. The spectra of ten different isotopologues were assigned for this species, leading to accurate effective and substitution structures. The weaker spectrum presents small tunnelling doublings caused by the torsional motion of the thiol group, which are only compatible with an antiperiplanar skeleton and a gauche thiol. The larger stability of the global minimum is attributed to an intramolecular S-H⋅⋅⋅π weak hydrogen bond. A comparison of the intramolecular interactions in the title molecule and 2-phenylethanol, similarly stabilized by a O-H⋅⋅⋅π hydrogen bond, shows the different strength of these interactions. Density functional (B3LYP-D3, B2PLYP-D3) and ab initio (MP2) calculations were conducted for the molecule.
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Affiliation(s)
- Rizalina Tama Saragi
- Departamento de Química Física y Química Inorgánica -, I.U. CINQUIMA, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén 7, 47011, Valladolid, Spain
- Present address: Institut für Ionenphysik und Angewandte Chemie, Universität Innsbruck, Technikerstr. 25/4. OG, 6020, Innsbruck, Austria
| | - Wenqin Li
- Departamento de Química Física y Química Inorgánica -, I.U. CINQUIMA, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén 7, 47011, Valladolid, Spain
| | - Marcos Juanes
- Departamento de Química Física y Química Inorgánica -, I.U. CINQUIMA, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén 7, 47011, Valladolid, Spain
| | - Lourdes Enríquez
- Departamento de Electrónica, ETSIT, Universidad de Valladolid, Paseo de Belén 11, 47011, Valladolid, Spain
| | - Ruth Pinacho
- Departamento de Electrónica, ETSIT, Universidad de Valladolid, Paseo de Belén 11, 47011, Valladolid, Spain
| | - José Emiliano Rubio
- Departamento de Electrónica, ETSIT, Universidad de Valladolid, Paseo de Belén 11, 47011, Valladolid, Spain
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica -, I.U. CINQUIMA, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén 7, 47011, Valladolid, Spain
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4
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Lu T, Zhang J, Xu Y, Wang Z, Feng G, Zeng Z. Hydrogen bond interactions between thioethers and amides: A joint rotational spectroscopic and theoretical study of the formamide⋯dimethyl sulfide adduct. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 288:122199. [PMID: 36473293 DOI: 10.1016/j.saa.2022.122199] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 11/17/2022] [Accepted: 11/27/2022] [Indexed: 06/17/2023]
Abstract
The rotational spectrum of the binary adduct of formamide (HCONH2) with dimethyl sulfide (DMS) has been investigated employing cavity-based Fourier transform microwave spectroscopy combined with theoretical computations. Experimentally, only one isomer of the adduct was unambiguously observed and assigned according to the theoretically predicted spectroscopic parameters, and its rotational spectrum displays the hyperfine splittings associated with the 14N nuclear quadrupole coupling effect. The observed isomer exhibits Cs symmetry, such that the ∠CSC angle of the DMS subunit is bisected by the ab-plane of the HCONH2 moiety. The two moieties in the detected isomer are connected via one primary NH···S and two secondary CH···O hydrogen bonds. Quantum theory of atoms in molecules (QTAIM), non-covalent interaction (NCI), natural bond orbital (NBO) and symmetry-adapted perturbation theory (SAPT) approaches were utilized for characterizing the intermolecular interactions occurring in the titled adduct. Additionally, the adduct of HCONH2 with dimethyl ether (DME) was also theoretically investigated to compare the difference in structure and energy characteristics between the NH···S and NH···O hydrogen bonds.
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Affiliation(s)
- Tao Lu
- School of Biology and Engineering, Guizhou Medical University, Guiyang 550025, China; School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, Chongqing 401331, China.
| | - Jiaqi Zhang
- School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, Chongqing 401331, China
| | - Yugao Xu
- School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, Chongqing 401331, China
| | - Zhen Wang
- School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, Chongqing 401331, China
| | - Gang Feng
- School of Chemistry and Chemical Engineering, Chongqing University, Daxuecheng South Rd. 55, Chongqing 401331, China
| | - Zhu Zeng
- School of Biology and Engineering, Guizhou Medical University, Guiyang 550025, China.
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5
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Wu F, Wang Y, Qian Y, Xie ZB, Ke Z, Zhao Y, Liu Z. A Green Route to Benzyl Phenyl Sulfide from Thioanisole and Benzyl Alcohol over Dual Functional Ionic Liquids. Chem Asian J 2023; 18:e202201078. [PMID: 36445934 DOI: 10.1002/asia.202201078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/20/2022] [Accepted: 11/28/2022] [Indexed: 12/03/2022]
Abstract
Benzyl phenyl sulfide is a kind of important chemicals with wide usage, which is mainly prepared through a nucleophilic reaction of thiophenol with benzyl chlorides or benzyl alcohols, suffering from inherent drawbacks, such as low efficiency, requirements for equivalent acid or base catalysts and formation of harmful byproducts and waste. Herein, we report a green route to access various benzyl phenyl sulfide derivatives in good to excellent yields under mild conditions via the reaction of thioanisoles with benzyl alcohols over ionic liquid 1-propylsulfonate-3-methylimidazolium trifluoromethanesulfonate ([SO3 HPrMIm][OTf]). Mechanism investigation indicates that the synergic effect of cation and anion of [SO3 HPrMIm][OTf] activates thioanisoles and benzyl alcohols via hydrogen bonding, thus catalyzes the dehydration of benzyl alcohol to dibenzyl ether and the subsequent metathesis reaction between dibenzyl ether and benzyl phenyl sulfide, finally generating benzyl phenyl sulfide derivatives. This is a simple, highly efficient, and green approach to produce benzyl phenyl sulfide derivatives, which has promising application potentials.
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Affiliation(s)
- Fengtian Wu
- Province Key Laboratory of Synthetic Chemistry J, iangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices, East China University of Technology Economic Development Zone, Guanglan Avenue 418, 330013, Nanchang, P. R. China.,Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), North First Street 2, 100190, Beijing, P. R. China)
| | - Yuepeng Wang
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), North First Street 2, 100190, Beijing, P. R. China)
| | - Yong Qian
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), North First Street 2, 100190, Beijing, P. R. China)
| | - Zong-Bo Xie
- Province Key Laboratory of Synthetic Chemistry J, iangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices, East China University of Technology Economic Development Zone, Guanglan Avenue 418, 330013, Nanchang, P. R. China
| | - Zhengang Ke
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), North First Street 2, 100190, Beijing, P. R. China)
| | - Yanfei Zhao
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), North First Street 2, 100190, Beijing, P. R. China)
| | - Zhimin Liu
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), North First Street 2, 100190, Beijing, P. R. China)
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6
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Saragi R, Calabrese C, Juanes M, Pinacho R, Rubio JE, Pérez C, Lesarri A. π-Stacking Isomerism in Polycyclic Aromatic Hydrocarbons: The 2-Naphthalenethiol Dimer. J Phys Chem Lett 2023; 14:207-213. [PMID: 36583611 PMCID: PMC9841560 DOI: 10.1021/acs.jpclett.2c03299] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Accepted: 12/22/2022] [Indexed: 06/17/2023]
Abstract
π-Stacking is a common descriptor for face-to-face attractive forces between aromatic hydrocarbons. However, the physical origin of this interaction remains debatable. Here we examined π-stacking in a model homodimer formed by two thiol-substituted naphthalene rings. Two isomers of the 2-naphthalenethiol dimer were discovered using rotational spectroscopy, sharing a parallel-displaced crossed orientation and absence of thiol-thiol hydrogen bonds. One of the isomers presents C2 symmetry, structurally analogous to the global minimum of the naphthalene dimer. The experimental data were rationalized with molecular orbital calculations, revealing a shallow potential energy surface. Noncovalent interactions are dominated by dispersion forces according to SAPT energy decomposition. In addition, the reduced electronic density shows a diffuse and extended region of inter-ring interactions, compatible with the description of π-stacking as a competition between dispersion and Pauli repulsion forces.
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Affiliation(s)
- Rizalina
Tama Saragi
- Departamento
de Química Física y Química Inorgánica,
Facultad de Ciencias - I.U. CINQUIMA, Universidad
de Valladolid, Paseo de Belén, 7, E-47011 Valladolid, Spain
| | - Camilla Calabrese
- Departamento
de Química Física y Química Inorgánica,
Facultad de Ciencias - I.U. CINQUIMA, Universidad
de Valladolid, Paseo de Belén, 7, E-47011 Valladolid, Spain
| | - Marcos Juanes
- Departamento
de Química Física y Química Inorgánica,
Facultad de Ciencias - I.U. CINQUIMA, Universidad
de Valladolid, Paseo de Belén, 7, E-47011 Valladolid, Spain
| | - Ruth Pinacho
- Departamento
de Electrónica, ETSIT, Universidad
de Valladolid, Paseo de Belén, 11, E-47011 Valladolid, Spain
| | - José Emiliano Rubio
- Departamento
de Electrónica, ETSIT, Universidad
de Valladolid, Paseo de Belén, 11, E-47011 Valladolid, Spain
| | - Cristóbal Pérez
- Departamento
de Química Física y Química Inorgánica,
Facultad de Ciencias - I.U. CINQUIMA, Universidad
de Valladolid, Paseo de Belén, 7, E-47011 Valladolid, Spain
| | - Alberto Lesarri
- Departamento
de Química Física y Química Inorgánica,
Facultad de Ciencias - I.U. CINQUIMA, Universidad
de Valladolid, Paseo de Belén, 7, E-47011 Valladolid, Spain
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7
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Metya S, Das A. S–H···O Hydrogen Bond Can Win over O–H···S Hydrogen Bond: Gas-Phase Spectroscopy of 2-Fluorothiophenol···H 2O Complex. J Phys Chem A 2022; 126:9178-9189. [DOI: 10.1021/acs.jpca.2c06083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Surajit Metya
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
| | - Aloke Das
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
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8
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Camiruaga A, Saragi RT, Torres-Hernández F, Juanes M, Usabiaga I, Lesarri A, Fernández JA. The evolution towards cyclic structures in the aggregation of aromatic alcohols: the dimer, trimer and tetramer of 2-phenylethanol. Phys Chem Chem Phys 2022; 24:24800-24809. [PMID: 36214363 DOI: 10.1039/d2cp03485a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Gas-phase spectroscopic studies of alcohol clusters offer accurate information on the influence of non-covalent interactions on molecular recognition, and are of paramount importance to model supramolecular and biological chemical processes. Here, we examine the role of the aliphatic side chain in the self-aggregation of aromatic alcohols, using a multi-methodological gas-phase approach which combines microwave spectroscopy and mass-resolved electronic and vibrational laser spectroscopy. Spectroscopic and electronic structure computations were carried out for the dimer, trimer and tetramer of 2-phenylethanol, extending previous investigations on smaller aromatic alcohols. While the conformational flexibility of the ethyl group anticipates a variety of torsional isomers, the intra- and inter-molecular interactions restrict molecular conformations and favour particularly stable isomers. The conformational landscape of the clusters is very shallow and multiple competing isomers were rotationally and/or vibrationally detected, including three dimer species, two trimers and two tetramers. Cluster growth is associated with a tendency to form cyclic hydrogen bond structures.
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Affiliation(s)
- Ander Camiruaga
- Dep. of Physical Chemistry, Fac. of Science and Technology, University of the Basque Country (UPV/EHU), Bo̲ Sarriena S/N, Leioa, 48940, Spain.
| | - Rizalina Tama Saragi
- Dep. of Physical Chemistry and Inorganic Chemistry, Fac. of Sciences - I.U. CINQUIMA, University of Valladolid, Paseo de Belén, 7, 47011, Valladolid, Spain
| | - Fernando Torres-Hernández
- Dep. of Physical Chemistry, Fac. of Science and Technology, University of the Basque Country (UPV/EHU), Bo̲ Sarriena S/N, Leioa, 48940, Spain.
| | - Marcos Juanes
- Dep. of Physical Chemistry and Inorganic Chemistry, Fac. of Sciences - I.U. CINQUIMA, University of Valladolid, Paseo de Belén, 7, 47011, Valladolid, Spain
| | - Imanol Usabiaga
- Dep. of Physical Chemistry, Fac. of Science and Technology, University of the Basque Country (UPV/EHU), Bo̲ Sarriena S/N, Leioa, 48940, Spain.
| | - Alberto Lesarri
- Dep. of Physical Chemistry and Inorganic Chemistry, Fac. of Sciences - I.U. CINQUIMA, University of Valladolid, Paseo de Belén, 7, 47011, Valladolid, Spain
| | - José A Fernández
- Dep. of Physical Chemistry, Fac. of Science and Technology, University of the Basque Country (UPV/EHU), Bo̲ Sarriena S/N, Leioa, 48940, Spain.
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9
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Juanes M, Saragi RT, Pérez C, Evangelisti L, Enríquez L, Jaraíz M, Lesarri A. Hydrogen Bonding in the Dimer and Monohydrate of 2-Adamantanol: A Test Case for Dispersion-Corrected Density Functional Methods. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27082584. [PMID: 35458782 PMCID: PMC9030514 DOI: 10.3390/molecules27082584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Revised: 04/10/2022] [Accepted: 04/15/2022] [Indexed: 11/29/2022]
Abstract
Weakly-bound intermolecular clusters constitute reductionist physical models for non-covalent interactions. Here we report the observation of the monomer, the dimer and the monohydrate of 2-adamantanol, a secondary alcohol with a bulky ten-carbon aliphatic skeleton. The molecular species were generated in a supersonic jet expansion and characterized using broadband chirped-pulse microwave spectroscopy in the 2–8 GHz frequency region. Two different gauche-gauche O-H···O hydrogen-bonded isomers were observed for the dimer of 2-adamantanol, while a single isomer was observed for the monomer and the monohydrate. The experimental rotational parameters were compared with molecular orbital calculations using density functional theory (B3LYP-D3(BJ), B2PLYP-D3(BJ), CAM-B3LYP-D3(BJ), ωB97XD), additionally providing energetic and electron density characterization. The shallow potential energy surface makes the dimer an interesting case study to benchmark dispersion-corrected computational methods and conformational search procedures.
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Affiliation(s)
- Marcos Juanes
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias—I.U. CINQUIMA, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain; (M.J.); (R.T.S.); (C.P.)
| | - Rizalina Tama Saragi
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias—I.U. CINQUIMA, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain; (M.J.); (R.T.S.); (C.P.)
| | - Cristóbal Pérez
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias—I.U. CINQUIMA, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain; (M.J.); (R.T.S.); (C.P.)
| | - Luca Evangelisti
- Dipartimento di Chimica ‘‘Giacomo Ciamician’’, Università di Bologna, Via Selmi, 2, 40126 Bologna, Italy;
| | - Lourdes Enríquez
- Departamento de Electrónica, Escuela Técnica Superior de Ingenieros de Telecomunicación, Universidad de Valladolid, Paseo de Belén, 15, 47011 Valladolid, Spain; (L.E.); (M.J.)
| | - Martín Jaraíz
- Departamento de Electrónica, Escuela Técnica Superior de Ingenieros de Telecomunicación, Universidad de Valladolid, Paseo de Belén, 15, 47011 Valladolid, Spain; (L.E.); (M.J.)
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias—I.U. CINQUIMA, Universidad de Valladolid, Paseo de Belén, 7, 47011 Valladolid, Spain; (M.J.); (R.T.S.); (C.P.)
- Correspondence: ; Tel.: +34-983-185895
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10
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Juanes M, Saragi RT, Pérez C, Enríquez L, Jaraíz M, Lesarri A. Torsional chirality and molecular recognition: the homo and heterochiral dimers of thenyl and furfuryl alcohol. Phys Chem Chem Phys 2022; 24:8999-9006. [PMID: 35380144 DOI: 10.1039/d2cp00479h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Furfuryl alcohol and thenyl alcohol contain a labile torsional chiral center, producing transiently chiral enantiomers interconverting in the nanosecond time-scale. We explored chiral molecular recognition using the weakly-bound intermolecular dimers of both alcohols, freezing stereomutation. Supersonic jet broadband microwave spectroscopy revealed homo and heterochiral diastereoisomers for each alcohol dimer and the structural characteristics of the clusters. All dimers are primarily stabilized by a moderately intense O-H⋯O hydrogen bond, but differ in the secondary interactions, which introduce additional hydrogen bonds either to the ring oxygen in furfuryl alcohol or to the π ring system in thenyl alcohol. Density-functional calculations (B2PLYP-D3(BJ)/def2-TZVP) show no clear preferences for a particular stereochemistry in the dimers, with relative energies of the order 1-2 kJ mol-1. The study suggests opportunities for the investigation of chiral recognition in molecules with torsional barriers in between transient and permanent interconversion regimes.
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Affiliation(s)
- Marcos Juanes
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias - I.U. CINQUIMA, Universidad de Valladolid, Paseo de Belén 7, 47011 Valladolid, Spain.
| | - Rizalina Tama Saragi
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias - I.U. CINQUIMA, Universidad de Valladolid, Paseo de Belén 7, 47011 Valladolid, Spain.
| | - Cristóbal Pérez
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias - I.U. CINQUIMA, Universidad de Valladolid, Paseo de Belén 7, 47011 Valladolid, Spain.
| | - Lourdes Enríquez
- Departamento de Electrónica, ETSIT, Universidad de Valladolid, Paseo de Belén 15, 47011 Valladolid, Spain
| | - Martín Jaraíz
- Departamento de Electrónica, ETSIT, Universidad de Valladolid, Paseo de Belén 15, 47011 Valladolid, Spain
| | - Alberto Lesarri
- Departamento de Química Física y Química Inorgánica, Facultad de Ciencias - I.U. CINQUIMA, Universidad de Valladolid, Paseo de Belén 7, 47011 Valladolid, Spain.
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11
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Attaching Onto or Inserting Into an Intramolecular Hydrogen Bond: Exploring and Controlling a Chirality-Dependent Dilemma for Alcohols. Symmetry (Basel) 2022. [DOI: 10.3390/sym14020357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Prereactive complexes in noncovalent organocatalysis are sensitive to the relative chirality of the binding partners and to hydrogen bond isomerism. Both effects are present when a transiently chiral alcohol docks on a chiral α-hydroxy ester, turning such 1:1 complexes into elementary, non-reactive model systems for chirality induction in the gas phase. With the help of linear infrared and Raman spectroscopy in supersonic jet expansions, conformational preferences are investigated for benzyl alcohol in combination with methyl lactate, also exploring p-chlorination of the alcohol and the achiral homolog methyl glycolate to identify potential London dispersion and chirality effects on the energy sequence. Three of the four combinations prefer barrierless complexation via the hydroxy group of the ester (association). In contrast, the lightest complex predominantly shows insertion into the intramolecular hydrogen bond, such as the analogous lactate and glycolate complexes of methanol. The experimental findings are rationalized with computations, and a uniform helicality induction in the alcohol by the lactate is predicted, independent of insertion into or association with the internal lactate hydrogen bond. p-chlorination of benzyl alcohol has a stabilizing effect on association because the insertion motif prevents a close contact between the chlorine and the hydroxy ester. After simple anharmonicity and substitution corrections, the B3LYP-D3 approach offers a fairly systematic description of the known spectroscopic data on alcohol complexes with α-hydroxy esters.
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12
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Arakawa Y, Shiba T, Igawa K, Sasaki S, Tsuji H. 4′-Alkylseleno-4-cyanobiphenyls, nSeCB: synthesis and substituent effects on the phase-transition and liquid crystalline behaviors. CrystEngComm 2022. [DOI: 10.1039/d2ce00551d] [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
A homologous series of 4′-alkylseleno-4-cyanobiphenyls (nSeCB) was synthesized and their phase-transition behaviors were investigated and compared with those of the alkyl, alkoxy, and alkylthio homologs.
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Affiliation(s)
- Yuki Arakawa
- Department of Applied Chemistry and Life Science, Graduate School of Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
| | - Takuma Shiba
- Department of Applied Chemistry and Life Science, Graduate School of Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
| | - Kazunobu Igawa
- Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
| | - Shunsuke Sasaki
- Nantes Université, CNRS, Institut des Matériaux de Nantes Jean Rouxel, IMN, F-44000 Nantes, France
| | - Hideto Tsuji
- Department of Applied Chemistry and Life Science, Graduate School of Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
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