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Liubimovskii SO, Novikov VS, Ustynyuk LY, Ivchenko PV, Prokhorov KA, Kuzmin VV, Sagitova EA, Godyaeva MM, Gudkov SV, Darvin ME, Nikolaeva GY. Raman structural study of ethylene glycol and 1,3-propylene glycol aqueous solutions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 285:121927. [PMID: 36209716 DOI: 10.1016/j.saa.2022.121927] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 09/10/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
Raman spectra of ethylene glycol (EG) and 1,3-propylene glycol (1,3-PG) aqueous solutions with the diol content from 10 to 90 mol% were measured. The diol content weakly influences the EG and 1,3-PG Raman bands in the spectra of the solutions in the region 250-1800 cm-1. This fact means that the conformational compositions of both the diols do not change significantly with dissolving in water. The intensity of the OH stretching band with respect to the diol bands intensities is the linear function of the ratio of the mole contents of water and the diol in the solutions. The spectral region 2800-3800 cm-1 can be used to evaluate the chemical composition of these binary solutions. DFT modeling of the Raman spectra of EG molecule in water shell confirms the prevalence of the gauche-conformation of EG in the aqueous solutions.
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Affiliation(s)
- S O Liubimovskii
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov Str. 38, 119991 Moscow, Russian Federation.
| | - V S Novikov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov Str. 38, 119991 Moscow, Russian Federation
| | - L Yu Ustynyuk
- Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1-3, 119991 Moscow, Russian Federation
| | - P V Ivchenko
- Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1-3, 119991 Moscow, Russian Federation; A. V. Topchiev Institute of Petrochemical Synthesis of the Russian Academy of Sciences, Leninsky Avenue 29, 119991 Moscow, Russian Federation
| | - K A Prokhorov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov Str. 38, 119991 Moscow, Russian Federation
| | - V V Kuzmin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov Str. 38, 119991 Moscow, Russian Federation
| | - E A Sagitova
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov Str. 38, 119991 Moscow, Russian Federation
| | - M M Godyaeva
- Soil Science Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory 1-12, 119991 Moscow, Russian Federation; Federal Scientific Agronomic and Engineering Center VIM, 1st Institutsky proezd, 5, 109428 Moscow, Russian Federation
| | - S V Gudkov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov Str. 38, 119991 Moscow, Russian Federation; Federal Scientific Agronomic and Engineering Center VIM, 1st Institutsky proezd, 5, 109428 Moscow, Russian Federation
| | - M E Darvin
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Dermatology, Venerology and Allergology, Center of Experimental and Applied Cutaneous Physiology, Charitéplatz 1, 10117 Berlin, Germany
| | - G Yu Nikolaeva
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov Str. 38, 119991 Moscow, Russian Federation
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2
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Kuzmin V, Novikov V, Sagitova E, Ustynyuk L, Prokhorov K, Ivchenko P, Nikolaeva G. Correlations among the Raman spectra and the conformational compositions of ethylene glycol, 1,2- and 1,3-propylene glycols. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130847] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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3
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Zhang N, Li MR, Zhang FS. Structure and dynamics properties of liquid ethylene glycol from molecular dynamics simulations. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.01.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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4
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Geske J, Harrach M, Heckmann L, Horstmann R, Klameth F, Müller N, Pafong E, Wohlfromm T, Drossel B, Vogel M. Molecular Dynamics Simulations of Water, Silica, and Aqueous Mixtures in Bulk and Confinement. ACTA ACUST UNITED AC 2018. [DOI: 10.1515/zpch-2017-1042] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Abstract
Aqueous systems are omnipresent in nature and technology. They show complex behaviors, which often originate in the existence of hydrogen-bond networks. Prominent examples are the anomalies of water and the non-ideal behaviors of aqueous solutions. The phenomenology becomes even richer when aqueous liquids are subject to confinement. To this day, many properties of water and its mixtures, in particular, under confinement, are not understood. In recent years, molecular dynamics simulations developed into a powerful tool to improve our knowledge in this field. Here, our simulation results for water and aqueous mixtures in the bulk and in various confinements are reviewed and some new simulation data are added to improve our knowledge about the role of interfaces. Moreover, findings for water are compared with results for silica, exploiting that both systems form tetrahedral networks.
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Affiliation(s)
- Julian Geske
- Institut für Festkörperphysik , Technische Universität Darmstadt, Hochschulstr. 6 , 64289 Darmstadt , Germany
| | - Michael Harrach
- Institut für Festkörperphysik , Technische Universität Darmstadt, Hochschulstr. 6 , 64289 Darmstadt , Germany
| | - Lotta Heckmann
- Institut für Festkörperphysik , Technische Universität Darmstadt, Hochschulstr. 6 , 64289 Darmstadt , Germany
| | - Robin Horstmann
- Institut für Festkörperphysik , Technische Universität Darmstadt, Hochschulstr. 6 , 64289 Darmstadt , Germany
| | - Felix Klameth
- Institut für Festkörperphysik , Technische Universität Darmstadt, Hochschulstr. 6 , 64289 Darmstadt , Germany
| | - Niels Müller
- Institut für Festkörperphysik , Technische Universität Darmstadt, Hochschulstr. 6 , 64289 Darmstadt , Germany
| | - Elvira Pafong
- Institut für Festkörperphysik , Technische Universität Darmstadt, Hochschulstr. 6 , 64289 Darmstadt , Germany
| | - Timothy Wohlfromm
- Institut für Festkörperphysik , Technische Universität Darmstadt, Hochschulstr. 6 , 64289 Darmstadt , Germany
| | - Barbara Drossel
- Institut für Festkörperphysik , Technische Universität Darmstadt, Hochschulstr. 6 , 64289 Darmstadt , Germany
| | - Michael Vogel
- Institut für Festkörperphysik , Technische Universität Darmstadt, Hochschulstr. 6 , 64289 Darmstadt , Germany
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Jindal A, Vasudevan S. Conformation of Ethylene Glycol in the Liquid State: Intra- versus Intermolecular Interactions. J Phys Chem B 2017; 121:5595-5600. [DOI: 10.1021/acs.jpcb.7b02853] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Aman Jindal
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Sukumaran Vasudevan
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
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6
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Schmitz R, Müller N, Ullmann S, Vogel M. A molecular dynamics simulations study on ethylene glycol-water mixtures in mesoporous silica. J Chem Phys 2016; 145:104703. [DOI: 10.1063/1.4962240] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Rebecca Schmitz
- Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Niels Müller
- Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Svenja Ullmann
- Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Michael Vogel
- Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
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7
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Yoo IK, Kim JI, Kang YK. Conformational preferences and antimicrobial activities of alkanediols. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.04.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Shimizu Y, Blanchard JW, Pustelny S, Saielli G, Bagno A, Ledbetter MP, Budker D, Pines A. Zero-field nuclear magnetic resonance spectroscopy of viscous liquids. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2015; 250:1-6. [PMID: 25459881 DOI: 10.1016/j.jmr.2014.10.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 10/11/2014] [Accepted: 10/11/2014] [Indexed: 05/27/2023]
Abstract
We report zero-field NMR measurements of a viscous organic liquid, ethylene glycol. Zero-field spectra were taken showing resolved scalar spin-spin coupling (J-coupling) for ethylene glycol at different temperatures and water contents. Molecular dynamics strongly affects the resonance linewidth, which closely follows viscosity. Quantum chemical calculations have been used to obtain the relative stability and coupling constants of all ethylene glycol conformers. The results show the potential of zero-field NMR as a probe of molecular structure and dynamics in a wide range of environments, including viscous fluids.
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Affiliation(s)
- Y Shimizu
- Department of Physics, University of California at Berkeley, CA 94720-7300, United States; Department of Physics, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - J W Blanchard
- Department of Chemistry, University of California at Berkeley, CA 94720, United States; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States.
| | - S Pustelny
- Department of Physics, University of California at Berkeley, CA 94720-7300, United States
| | - G Saielli
- CNR Institute on Membrane Technology, Padova Unit, Via Marzolo, 1, 35131 Padova, Italy
| | - A Bagno
- Department of Chemical Sciences, University of Padova, Via Marzolo, 1, 35131 Padova, Italy
| | - M P Ledbetter
- Department of Physics, University of California at Berkeley, CA 94720-7300, United States
| | - D Budker
- Department of Physics, University of California at Berkeley, CA 94720-7300, United States; Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Helmholtz-Institut Mainz, Johannes Gutenberg University, Germany
| | - A Pines
- Department of Chemistry, University of California at Berkeley, CA 94720, United States; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
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9
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Kaiser A, Ismailova O, Koskela A, Huber SE, Ritter M, Cosenza B, Benger W, Nazmutdinov R, Probst M. Ethylene glycol revisited: Molecular dynamics simulations and visualization of the liquid and its hydrogen-bond network. J Mol Liq 2014; 189:20-29. [PMID: 24748697 PMCID: PMC3990454 DOI: 10.1016/j.molliq.2013.05.033] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular dynamics simulations of liquid ethylene glycol described by the OPLS-AA force field were performed to gain insight into its hydrogen-bond structure. We use the population correlation function as a statistical measure for the hydrogen-bond lifetime. In an attempt to understand the complicated hydrogen-bonding, we developed new molecular visualization tools within the Vish Visualization shell and used it to visualize the life of each individual hydrogen-bond. With this tool hydrogen-bond formation and breaking as well as clustering and chain formation in hydrogen-bonded liquids can be observed directly. Liquid ethylene glycol at room temperature does not show significant clustering or chain building. The hydrogen-bonds break often due to the rotational and vibrational motions of the molecules leading to an H-bond half-life time of approximately 1.5 ps. However, most of the H-bonds are reformed again so that after 50 ps only 40% of these H-bonds are irreversibly broken due to diffusional motion. This hydrogen-bond half-life time due to diffusional motion is 80.3 ps. The work was preceded by a careful check of various OPLS-based force fields used in the literature. It was found that they lead to quite different angular and H-bond distributions.
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Affiliation(s)
- Alexander Kaiser
- Institute for Ion-Physics and Applied Physics, University of Innsbruck, 6020, Technikerstraße 25/3, Austria
| | - Oksana Ismailova
- Institute for Ion-Physics and Applied Physics, University of Innsbruck, 6020, Technikerstraße 25/3, Austria
- Institute Ion-Plasma and Laser Technology of Uzbekistan Academy Sciences, Uzbekistan
| | - Antti Koskela
- Institute for Mathematics, University of Innsbruck, 6020, Technikerstraße 25/3, Austria
| | - Stefan E. Huber
- Institute for Ion-Physics and Applied Physics, University of Innsbruck, 6020, Technikerstraße 25/3, Austria
| | - Marcel Ritter
- Institute for Basic Sciences in Engineering Science, University of Innsbruck, 6020, Technikerstraße 13, Austria
| | - Biagio Cosenza
- Institute for Computer Science, University of Innsbruck, 6020, Technikerstraße 25/3, Austria
| | - Werner Benger
- Center for Computation and Technology, Louisiana State University, 211 Johnston Hall, Baton Rouge, LA 70803, United States
| | - Renat Nazmutdinov
- Kazan National Research Technological University, 420015 Kazan, Republic of Tatarstan, Russian Federation
| | - Michael Probst
- Institute for Ion-Physics and Applied Physics, University of Innsbruck, 6020, Technikerstraße 25/3, Austria
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10
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Kumar RM, Baskar P, Balamurugan K, Das S, Subramanian V. On the perturbation of the H-bonding interaction in ethylene glycol clusters upon hydration. J Phys Chem A 2012; 116:4239-47. [PMID: 22530594 DOI: 10.1021/jp300693r] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ab initio and density functional methods have been employed to study the structure, stability, and spectral properties of various ethylene glycol (EG(m)) and ethylene glycol-water (EG(m)W(n)) (m = 1-3, n = 1-4) clusters. The effective fragment potential (EFP) approach was used to explore various possible EG(m)W(n) clusters. Calculated interaction energies of EG(m)W(n) clusters confirm that the hydrogen-bonding interaction between EG molecules is perturbed by the presence of water molecules and vice versa. Further, energy decomposition analysis shows that both electrostatic and polarization interactions predominantly contribute to the stability of these clusters. It was found from the same analysis that ethylene glycol-water interaction is predominant over the ethylene glycol-ethylene glycol and water-water interactions. Overall, the results clearly illustrate that the presence of water disrupts the ethylene glycol-ethylene glycol hydrogen bonds.
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Affiliation(s)
- R Mahesh Kumar
- Chemical Laboratory, CSIR-Central Leather Research Institute, Adyar, Chennai 600 020, India
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11
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Geerke DP, van Gunsteren WF. The performance of non-polarizable and polarizable force-field parameter sets for ethylene glycol in molecular dynamics simulations of the pure liquid and its aqueous mixtures. Mol Phys 2010. [DOI: 10.1080/00268970701444631] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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12
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Smith AA, Drake MD, Rahim AK, Roberts JD. Determination of the Dihedral Angle of the Monoanion of Succinic Acid in Aprotic Media. J Phys Chem A 2008; 112:12367-71. [DOI: 10.1021/jp801644a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Albert A. Smith
- California Institute of Technology, 1200 East California Blvd. Pasadena, California 91125
| | - Michael D. Drake
- California Institute of Technology, 1200 East California Blvd. Pasadena, California 91125
| | - Andreas K. Rahim
- California Institute of Technology, 1200 East California Blvd. Pasadena, California 91125
| | - John D. Roberts
- California Institute of Technology, 1200 East California Blvd. Pasadena, California 91125
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13
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Kirschner KN, Yongye AB, Tschampel SM, González-Outeiriño J, Daniels CR, Foley BL, Woods RJ. GLYCAM06: a generalizable biomolecular force field. Carbohydrates. J Comput Chem 2008; 29:622-55. [PMID: 17849372 PMCID: PMC4423547 DOI: 10.1002/jcc.20820] [Citation(s) in RCA: 1575] [Impact Index Per Article: 98.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A new derivation of the GLYCAM06 force field, which removes its previous specificity for carbohydrates, and its dependency on the AMBER force field and parameters, is presented. All pertinent force field terms have been explicitly specified and so no default or generic parameters are employed. The new GLYCAM is no longer limited to any particular class of biomolecules, but is extendible to all molecular classes in the spirit of a small-molecule force field. The torsion terms in the present work were all derived from quantum mechanical data from a collection of minimal molecular fragments and related small molecules. For carbohydrates, there is now a single parameter set applicable to both alpha- and beta-anomers and to all monosaccharide ring sizes and conformations. We demonstrate that deriving dihedral parameters by fitting to QM data for internal rotational energy curves for representative small molecules generally leads to correct rotamer populations in molecular dynamics simulations, and that this approach removes the need for phase corrections in the dihedral terms. However, we note that there are cases where this approach is inadequate. Reported here are the basic components of the new force field as well as an illustration of its extension to carbohydrates. In addition to reproducing the gas-phase properties of an array of small test molecules, condensed-phase simulations employing GLYCAM06 are shown to reproduce rotamer populations for key small molecules and representative biopolymer building blocks in explicit water, as well as crystalline lattice properties, such as unit cell dimensions, and vibrational frequencies.
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Affiliation(s)
- Karl N Kirschner
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, Georgia 30602, USA
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14
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Roberts JD. Fascination with the conformational analysis of succinic acid, as evaluated by NMR spectroscopy, and why. Acc Chem Res 2006; 39:889-96. [PMID: 17176027 DOI: 10.1021/ar050229p] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A serendipitous effort to use NMR spectroscopy to determine the conformational preferences of succinate monoanion opened a Pandora's box of unexpected uncertainties as to what influences such preferences of succinic acid in its various ionization states, not only in water but also in other less polar protic solvents, as well as a range of aprotic solvents. The dianion in aprotic solvents shows substantial gauche preferences, which give the appearance of violating Coulomb's law.
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Affiliation(s)
- John D Roberts
- Crellin Laboratory of Chemistry, California Institute of Technology, Pasadena, CA 91125, USA
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15
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Chidichimo G, Formoso P, Golemme A, Imbardelli D. Conformation of succinic acid: its pH dependence by Licry-NMR analysis. Mol Phys 2006. [DOI: 10.1080/00268979300101051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- G. Chidichimo
- a Dipartimento di Chimica , Universitá della Calabria , 87030 , Arcavacata di Rende , Italy
| | - P. Formoso
- a Dipartimento di Chimica , Universitá della Calabria , 87030 , Arcavacata di Rende , Italy
| | - A. Golemme
- a Dipartimento di Chimica , Universitá della Calabria , 87030 , Arcavacata di Rende , Italy
| | - D. Imbardelli
- a Dipartimento di Chimica , Universitá della Calabria , 87030 , Arcavacata di Rende , Italy
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16
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Drake MD, Harsha AK, Terterov S, Roberts JD. Conformational analyses of 2,3-dihydroxypropanoic acid as a function of solvent and ionization state as determined by NMR spectroscopy. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2006; 44:210-9. [PMID: 16477695 DOI: 10.1002/mrc.1758] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Vicinal (1)H--(1)H coupling constants were used to determine the conformational preferences of 2,3-dihydroxypropanoic acid (1) (DL-glyceric acid) in various solvents and its different carboxyl ionization states. The stereospecific assignments of J(12) and J(13) were confirmed through the point-group substitution of the C-3 hydrogen with deuterium, yielding rac-(2SR,3RS)-[3-(2)H]-1, and the observation of only J(13) in the (1)H NMR spectra. While hydrogen bonding and steric strain may be expected to drive the conformational equilibrium, their role is overshadowed by a profound gauche effect between the vicinal hydroxyl groups that mimics other substituted ethanes, such as 1,2-ethanediol and 1,2-difluoroethane. At low pH, the conformational equilibrium is heavily weighted toward the gauche-hydroxyl rotamers with a range of 81% in DMSO-d(6) to 92% in tert-butyl alcohol-d(10). At high pH, the equilibrium exhibits a larger dependence upon the polarity and solvating capability of the medium, although the gauche effect still dominates in D(2)O, 1,4-dioxane-d(8), methanol-d(4), and ethanol-d(6) (96, 89, 85, and 83% gauche-hydroxyls respectively). The observed preference for the gauche-hydroxyl rotamers is believed to stem primarily from hyperconjugative sigma(C--H) --> sigma*(C--OH) interactions.
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Affiliation(s)
- Michael D Drake
- Gates and Crellin Laboratories of Chemistry, California Institute of Technology, Pasadena, California 91125, USA
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17
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Vital de Oliveira O, Gomide Freitas LC. Molecular dynamics simulation of liquid ethylene glycol and its aqueous solution. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.theochem.2005.05.017] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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18
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Fabri D, Williams MAK, Halstead TK. Water T2 relaxation in sugar solutions. Carbohydr Res 2005; 340:889-905. [PMID: 15780255 DOI: 10.1016/j.carres.2005.01.034] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2004] [Accepted: 01/27/2005] [Indexed: 10/25/2022]
Abstract
1H spin-spin relaxation times of water were measured with the CPMG sequence in dilute aqueous solutions of glucitol, mannitol, glycerol, glycol, the methyl D-pyranosides of alpha-glucose, beta-glucose, alpha-galactose, beta-galactose, alpha-xylose, beta-xylose, beta-arabinose and sucrose, alpha,alpha-trehalose, beta-maltose, maltotriose and maltoheptaose. The relaxation-time dispersion was measured by varying the CPMG pulse spacing, tau. These data were interpreted by means of the Carver-Richards model in which exchange between water protons and labile solute hydroxyl protons provides a significant contribution to the relaxation. From the dependences on temperature and tau, parameters characteristic of the pool of hydroxyls belonging to a given solute were extracted by nonlinear regression, including: the fraction of exchangeable protons, P, the chemical-shift difference between water protons and hydroxyl protons, deltaomega, the intrinsic spin-spin relaxation time, T2, and the chemical exchange rate, k. These solute-specific parameters are related, respectively, to the concentration, identity, mobility and exchange life-time of the hydroxyl site. At 298 K, values of deltaomega, T2 and k were found to be of the order of 1 ppm, 100 ms and 1000 s(-1), respectively. Effects of molecular size, conformation and solute concentration were investigated. The exchange mechanism was characterised by Eyring activation enthalpies and entropies with values in the ranges 50-70 kJ mol(-1) and -10 to 60 J K(-1)mol(-1), respectively.
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Affiliation(s)
- Deborah Fabri
- Department of Chemistry, University of York, Heslington, York YO19 6AL, UK.
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19
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Petterson KA, Stein RS, Drake MD, Roberts JD. An NMR investigation of the importance of intramolecular hydrogen bonding in determining the conformational equilibrium of ethylene glycol in solution. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2005; 43:225-230. [PMID: 15685593 DOI: 10.1002/mrc.1512] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Although conformational analysis by NMR of ethylene glycol indicates generally strong preferences for the gauche conformation in solvents ranging from water to chloroform, the bulk of the NMR evidence indicates that intramolecular hydrogen bonding between the hydroxyl groups is unlikely to be a significant factor in determining that preference, except possibly in fairly non-polar solvents. The 'gauche effect' is clearly very important, especially in aqueous solution.
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Affiliation(s)
- Krag A Petterson
- Gates and Crellin Laboratories of Chemistry, California Institute of Technology, Pasadena, California 91125, USA
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20
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Chaudhari A, Lee SL. A computational study of microsolvation effect on ethylene glycol by density functional method. J Chem Phys 2004; 120:7464-9. [PMID: 15267657 DOI: 10.1063/1.1688754] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
This study focuses on the conformational analysis of ethylene glycol-(water)n (n=1-3) complex by using density functional theory method and the basis set 6-311++G*. Different conformers are reported and the basis set superposition error corrected total energy is -306.767 5171, -383.221 3135, and -459.694 1528 for lowest energy conformer with 1, 2, and 3 water molecules, respectively, with corresponding binding energy -7.75, -15.43, and -36.28 kcal/mol. On applying many-body analysis it has been found that relaxation energy, two-body, three-body energy have significant contribution to the binding energy for ethylene glycol-(water)3 complex whereas four-body energies are negligible. The most stable conformers of ethylene glycol-(water)n complex are the cyclic structures in which water molecules bridge between the two hydroxyl group of ethylene glycol.
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Affiliation(s)
- Ajay Chaudhari
- Department of Chemistry and Biochemistry, National Chung Cheng University, Ming-Hsiung, Chiayi-621, Taiwan
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Klein RA. Ab initio conformational studies on diols and binary diol-water systems using DFT methods. Intramolecular hydrogen bonding and 1:1 complex formation with water. J Comput Chem 2002; 23:585-99. [PMID: 11939593 DOI: 10.1002/jcc.10053] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Studies on the conformational equilibrium for the following diols, ethane-1,2-diol (12EG, CAS 107-21-1), 2R-D-(-)-propane-1,2-diol (12PG, CAS 4254-14-2), (2S,3S)-L-(+)-butane-2,3-diol (L23BD, CAS 19132-06-0), and (2S,3R)-meso-butane-2,3-diol (m23BD, CAS 5341-95-7), are described using Gaussian ab initio calculations involving density functional theory (DFT) methods. We also report in this article results on the stability and conformation for the 1:1 water-diol complex formed by ethane-1,2-diol, propane-1,2-diol, and L- and meso-butane-2,3-diol. The relative stability of the intramolecular (internal) hydrogen bond in a range of diols (n = 2 to 6), based on ab initio geometry optimization and determination of the -O...H- distance, dOH, and -O-H...O- angle, theta, increases through the sequence 1,2 approximately equals 2,3 < 1,3 < 1,4 approximately equals 1,5 approximately equals 1,6, as judged from the bond linearity and -O...H- separation. Quantum mechanical and topological analysis of possible intramolecular hydrogen bonding in this complete series of diols provides convincing evidence for this in diols in which the hydroxyl groups are separated by three or more carbon atoms, that is, in (n, n+m) diols for m > or = 2, but not for ethane-1,2-diol or other vicinal diols, which do not satisfy Popelier's topological and electron density criteria based on the AIM theory of Bader. Based on these criteria it is unlikely that vicinal diols are in fact capable of forming an intramolecular hydrogen bond, in spite of geometric and spectroscopic data in the literature suggesting otherwise.
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Affiliation(s)
- Roger A Klein
- Institute for Physiological Chemistry, University of Bonn, Federal Republic of Germany.
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Saiz L, Padró JA, Guàrdia E. Structure of liquid ethylene glycol: A molecular dynamics simulation study with different force fields. J Chem Phys 2001. [DOI: 10.1063/1.1340605] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Gas chromatographic properties of some liquid crystals containing dioxyethylene ether terminal chains. Chromatographia 1999. [DOI: 10.1007/bf02490839] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Norrman K, McMahon TB. Intramolecular Solvation of Carboxylate Anions in the Gas Phase. J Phys Chem A 1999. [DOI: 10.1021/jp9908202] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. Norrman
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1 Canada
| | - T. B. McMahon
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1 Canada
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Szulejko JE, McMahon TB, Troude V, Bouchoux G, Audier HE. Structure and Energetics of Protonated ω-Methoxy Alcohols. J Phys Chem A 1998. [DOI: 10.1021/jp972204g] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Teppen BJ, Cao M, Frey RF, van Alsenoy C, Miller DM, Schäfer L. An investigation into intramolecular hydrogen bonding: impact of basis set and electron correlation on the ab initio conformational analysis of 1,2-ethanediol and 1,2,3-propanetriol. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0166-1280(94)03809-y] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Separovic F, Pax R, Cornell B. NMR order parameter analysis of a peptide plane aligned in a lyotropic liquid crystal. Mol Phys 1993. [DOI: 10.1080/00268979300100281] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Alagona G, Ghio C. Conformational properties of ethanediol in aqueous solution as described by the continuous model of the solvent. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0166-1280(92)80073-u] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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