1
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Kim HJ. Spectroscopic and Chemical Properties of Ionic Liquids: Computational Study. CHEM REC 2023; 23:e202300075. [PMID: 37166396 DOI: 10.1002/tcr.202300075] [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: 02/27/2023] [Revised: 04/18/2023] [Indexed: 05/12/2023]
Abstract
A brief account is given of highlights of our computational efforts - often in collaboration with experimental groups - to understand spectroscopic and chemical properties of ionic liquids (ILs). Molecular dynamics, including their inhomogeneous character, responsible for key spectral features observed in dielectric absorption, infra-red (IR) and fluorescence correlation spectroscopy (FCS) measurements are elucidated. Mechanisms of chemical processes involving imidazolium-based ILs are illustrated for CO2 capture and related reactions, transesterification of cellulose, and Au nanocluster-catalyzed Suzuki cross-coupling reaction with attention paid to differing roles of IL ions. A comparison with experiments is also made.
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Affiliation(s)
- Hyung J Kim
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213, USA
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2
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Miranda-Quintana RA, Chen L, Craig VSJ, Smiatek J. Quantitative Solvation Energies from Gas-Phase Calculations: First-Principles Charge Transfer and Perturbation Approaches. J Phys Chem B 2023; 127:2546-2551. [PMID: 36917810 DOI: 10.1021/acs.jpcb.2c08907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
We present a first-principles approach for the calculation of solvation energies and enthalpies with respect to different ion pair combinations in various solvents. The method relies on the conceptual density functional theory (DFT) of solvation, from which detailed expressions for the solvation energies can be derived. In addition to fast and straightforward gas phase calculations, we also study the influence of modified chemical reactivity descriptors in terms of electronic perturbations. The corresponding phenomenological changes in molecular energy levels can be interpreted as the influence of continuum solvents. Our approach shows that the introduction of these modified expressions is essential for a quantitative agreement between the calculated and the experimental results.
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Affiliation(s)
- Ramón Alain Miranda-Quintana
- Department of Chemistry and Quantum Theory Project, University of Florida, Gainesville, Florida 32603, United States
| | - Lexin Chen
- Department of Chemistry, University of Florida, Gainesville, Florida 32603, United States
| | - Vincent S J Craig
- Department of Applied Mathematics, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Jens Smiatek
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany
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3
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Volumetric and acoustic properties of L-phenyl glycine and L-phenylalanine in aqueous solution of 1-dodecyl-3-methylimidazolium bromide [C12mim] [Br]. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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4
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Kobayashi T, Smiatek J, Fyta M. Probing the distribution of ionic liquid mixtures at charged and neutral interfaces via simulations and lattice-gas theory. Phys Chem Chem Phys 2022; 24:16471-16483. [PMID: 35766260 DOI: 10.1039/d2cp01346k] [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
Room temperature ionic liquid solutions confined between neutral and charged surfaces are investigated by means of atomistic Molecular Dynamics simulations. We study 1-ethyl-3-methylimidazolium dicyanamide ([EMIm]+[DCA]-) in water or dimethylsulfoxide (DMSO) mixtures in confinement between two interfaces. The analysis is based on the comparison of the molecular species involved and the charged state of the surfaces. Focus is given on the influence of different water/DMSO concentrations on the microstructuring and accumulation of each species. Thermodynamic aspects, such as the entropic contributions in the observed trends are obtained from the simulations using a lattice-gas theory. The results clearly underline the differences in these properties for the water and DMSO mixtures and unravel the underlying mechanisms and inherent details. We were able to pinpoint the importance of the size and the relative permittivity of the molecules in guiding their microstructuring in the vicinity of the surfaces, as well as their interactions with the latter, i.e. the solute-surface interactions. The influence of water and DMSO on the overscreening at charged interfaces is also discussed. The analysis on the molecular accumulation at the interfaces allows us to predict whether the accumulation is entropy or enthalpy driven, which has an impact in the removal of the molecular species from the surfaces. We discuss the impact of this work in providing an essential understanding towards a careful design of electrochemical elements.
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Affiliation(s)
- Takeshi Kobayashi
- Institute for Computational Physics, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany.
| | - Jens Smiatek
- Institute for Computational Physics, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany.
| | - Maria Fyta
- Institute for Computational Physics, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany.
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5
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Gaba R, Devi S, Pal A, Sharma D, Kumar H. Solvation properties of l-lysine and l-arginine in aqueous solutions of 1-heptyl-3-methyl imidazolium tetrafluoroborate [C7mim][BF4]at different temperatures. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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6
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Miranda-Quintana RA, Smiatek J. Specific Ion Effects in Different Media: Current Status and Future Challenges. J Phys Chem B 2021; 125:13840-13849. [PMID: 34918938 DOI: 10.1021/acs.jpcb.1c07957] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We discuss the current state of research as well as the future challenges for a deeper understanding of specific ion effects in protic and aprotic solvents as well as various additional media. Despite recent interest in solute or interfacial effects, we focus exclusively on the specific properties of ions in bulk electrolyte solutions. Corresponding results show that many mechanisms remain unknown for these simple media, although theoretical, computational, and experimental studies have provided some insights into explaining individual observations. In particular, the importance of local interactions and electronic properties is emphasized, which enabled a more consistent interpretation of specific ion effects over the past years. Despite current insufficient knowledge, we also discuss future challenges in relation to dynamic properties as well as the influence of different concentrations, different solvents, and solute contributions to gain a deeper understanding of specific ion effects for technological applications.
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Affiliation(s)
- Ramón Alain Miranda-Quintana
- Department of Chemistry and Quantum Theory Project, University of Florida, Gainesville, Florida 32611, United States
| | - Jens Smiatek
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany.,Digitalization Development Biologicals CMC, Boehringer Ingelheim Pharma GmbH & Co. KG, D-88397 Biberach (Riss), Germany
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7
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Rivera-Galletti A, Gough CR, Kaleem F, Burch M, Ratcliffe C, Lu P, Salas-de la Cruz D, Hu X. Silk-Cellulose Acetate Biocomposite Materials Regenerated from Ionic Liquid. Polymers (Basel) 2021; 13:2911. [PMID: 34502951 PMCID: PMC8433620 DOI: 10.3390/polym13172911] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 08/20/2021] [Accepted: 08/27/2021] [Indexed: 11/21/2022] Open
Abstract
The novel use of ionic liquid as a solvent for biodegradable and natural organic biomaterials has increasingly sparked interest in the biomedical field. As compared to more volatile traditional solvents that rapidly degrade the protein molecular weight, the capability of polysaccharides and proteins to dissolve seamlessly in ionic liquid and form fine and tunable biomaterials after regeneration is the key interest of this study. Here, a blended system consisting of Bombyx Mori silk fibroin protein and a cellulose derivative, cellulose acetate (CA), in the ionic liquid 1-ethyl-3-methylimidazolium acetate (EMIMAc) was regenerated and underwent characterization to understand the structure and physical properties of the films. The change in the morphology of the biocomposites (by scanning electron microscope, SEM) and their secondary structure analysis (by Fourier-transform infrared spectroscopy, FTIR) showed that the samples underwent a wavering conformational change on a microscopic level, resulting in strong interactions and changes in their crystalline structures such as the CA crystalline and silk beta-pleated sheets once the different ratios were applied. Differential scanning calorimetry (DSC) results demonstrated that strong molecular interactions were generated between CA and silk chains, providing the blended films lower glass transitions than those of the pure silk or cellulose acetate. All films that were blended had higher thermal stability than the pure cellulose acetate sample but presented gradual changes amongst the changing of ratios, as demonstrated by thermogravimetric analysis (TGA). This study provides the basis for the comprehension of the protein-polysaccharide composites for various biomedical applications.
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Affiliation(s)
- Ashley Rivera-Galletti
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA; (A.R.-G.); (C.R.G.); (F.K.); (M.B.); (C.R.)
- Department of Chemistry and Biochemistry, Rowan University, Glassboro, NJ 08028, USA;
| | - Christopher R. Gough
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA; (A.R.-G.); (C.R.G.); (F.K.); (M.B.); (C.R.)
- Department of Chemistry and Biochemistry, Rowan University, Glassboro, NJ 08028, USA;
| | - Farhan Kaleem
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA; (A.R.-G.); (C.R.G.); (F.K.); (M.B.); (C.R.)
| | - Michael Burch
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA; (A.R.-G.); (C.R.G.); (F.K.); (M.B.); (C.R.)
| | - Chris Ratcliffe
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA; (A.R.-G.); (C.R.G.); (F.K.); (M.B.); (C.R.)
| | - Ping Lu
- Department of Chemistry and Biochemistry, Rowan University, Glassboro, NJ 08028, USA;
| | - David Salas-de la Cruz
- Department of Chemistry, Center for Computational and Integrative Biology, Rutgers University-Camden, Camden, NJ 08102, USA;
| | - Xiao Hu
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA; (A.R.-G.); (C.R.G.); (F.K.); (M.B.); (C.R.)
- Department of Biomedical Engineering, Rowan University, Glassboro, NJ 08028, USA
- Department of Molecular and Cellular Biosciences, Rowan University, Glassboro, NJ 08028, USA
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8
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Kobayashi T, Smiatek J, Fyta M. Energetic Arguments on the Microstructural Analysis in Ionic Liquids. ADVANCED THEORY AND SIMULATIONS 2021. [DOI: 10.1002/adts.202100114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Takeshi Kobayashi
- Institute for Computational Physics University of Stuttgart Allmandring 3 Stuttgart 70569 Germany
| | - Jens Smiatek
- Institute for Computational Physics University of Stuttgart Allmandring 3 Stuttgart 70569 Germany
| | - Maria Fyta
- Institute for Computational Physics University of Stuttgart Allmandring 3 Stuttgart 70569 Germany
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9
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Gaba R, Malhotra J, Pal A, Sharma D, Kumar H. Molecular interactions of l-glutamic acid and l-aspartic acid in aqueous solutions 1-heptyl-3-methyl imidazolium tetrafluoroborate [C7mim][BF4] at different temperatures. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114971] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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10
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Yalcin D, Welsh ID, Matthewman EL, Jun SP, Mckeever-Willis M, Gritcan I, Greaves TL, Weber CC. Structural investigations of molecular solutes within nanostructured ionic liquids. Phys Chem Chem Phys 2020; 22:11593-11608. [PMID: 32400798 DOI: 10.1039/d0cp00783h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Ionic liquids (ILs) containing sufficiently long alkyl chains form amphiphilic nanostructures with well-defined polar and non-polar domains. Here we have explored the robustness of these amphiphilic nanostructures to added solutes and gained insight into how the nature of the solute and IL ions affect the partitioning of these solutes within the nanostructured domains of ILs. To achieve this, small angle X-ray scattering (SAXS) investigations were performed and discussed for mixtures of 9 different molecular compounds with 6 different ILs containing imidazolium cations. The amphiphilic nanostructure of ILs persisted to high solute concentrations, over 50 mol% of added solute for most 1-butyl-3-methylimidazolium ILs and above 80 mol% for most 1-decyl-3-methylimidazolium ILs. Solute partitioning within these domains was found to be controlled by the inherent polarity and size of the solute, as well as specific interactions between the solute and IL ions, with SAXS results corroborated with IR spectroscopy and molecular dynamics simulations. Molecular dynamics simulations also revealed the ability to induce π+-π+ stacking between imidazolium cations through the use of these added molecular compounds. Collectively, these results provide scope for the selection of IL ions to rationally influence and control the partitioning behaviour of given solutes within the amphiphilic nanostructure of ILs.
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Affiliation(s)
- Dilek Yalcin
- School of Science, RMIT University, Melbourne, Australia
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11
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Otero-Mato JM, Lesch V, Montes-Campos H, Smiatek J, Diddens D, Cabeza O, Gallego LJ, Varela LM. Solvation in ionic liquid-water mixtures: A computational study. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111273] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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12
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Smiatek J. Enthalpic contributions to solvent–solute and solvent–ion interactions: Electronic perturbation as key to the understanding of molecular attraction. J Chem Phys 2019; 150:174112. [PMID: 31067894 DOI: 10.1063/1.5092567] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jens Smiatek
- Institut für Computerphysik, Universität Stuttgart, Allmandring 3, D-70569 Stuttgart, Germany
- Helmholtz Institut Münster (HI MS–IEK 12): Ionenleiter in Energiespeichern, Forschungszentrum Jülich GmbH, Corrensstrasse 46, D-48149 Münster, Germany
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13
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Molecular interactions of some non-essential amino acids in aqueous solutions of 1-methylimidazolium chloride at different temperatures. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.01.094] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Poh Y, Ng S, Ho K. Formulation and characterisation of 1-ethyl-3-methylimidazolium acetate-in-oil microemulsions as the potential vehicle for drug delivery across the skin barrier. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.10.034] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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15
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Nandy A, Smiatek J. Mixtures of LiTFSI and urea: ideal thermodynamic behavior as key to the formation of deep eutectic solvents? Phys Chem Chem Phys 2019; 21:12279-12287. [PMID: 31139787 DOI: 10.1039/c9cp01440c] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
We studied the dynamic and structural properties of deep eutectic solvents composed of LiTFSI salts in presence of urea.
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Affiliation(s)
- Aniruddha Nandy
- Department of Mechanical Engineering
- Indian Institute of Technology
- Kharagpur
- India
- Helmholtz-Institute Münster: Ionics in Energy Storage (HIMS-IEK 12)
| | - Jens Smiatek
- Helmholtz-Institute Münster: Ionics in Energy Storage (HIMS-IEK 12)
- Forschungszentrum Jülich GmbH
- D-48149 Münster
- Germany
- Institute for Computational Physics
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16
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Zeindlhofer V, Berger M, Steinhauser O, Schröder C. A shell-resolved analysis of preferential solvation of coffee ingredients in aqueous mixtures of the ionic liquid 1-ethyl-3-methylimidazolium acetate. J Chem Phys 2018; 148:193819. [PMID: 30307218 DOI: 10.1063/1.5009802] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Ionic liquids increase the solubility of various coffee ingredients in aqueous solution but little is known about the underlying mechanism. Kirkwood-Buff integrals as well as the potential of mean force indicate that the imidazolium cations are accumulated at the surface of the solutes, removing water molecules from the solute surface. Although hydrogen bonding of the anions to hydroxy groups of the solutes can be detected, their concentration at the surface is less enhanced compared to the cations. The decomposition into solvation shells by Voronoi tessellation reveals that structural features are only observed in the first solvation shell. Nevertheless, the depletion of water and the excess concentration of the ions and, in particular, of the cations are visible in the next solvation shells as well. Therefore, classical arguments of hydrotropic theory fail to explain this behavior.
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Affiliation(s)
- Veronika Zeindlhofer
- Faculty of Chemistry, Department of Computational Biological Chemistry, University of Vienna, Vienna A-1090, Austria
| | - Magdalena Berger
- Faculty of Chemistry, Department of Computational Biological Chemistry, University of Vienna, Vienna A-1090, Austria
| | - Othmar Steinhauser
- Faculty of Chemistry, Department of Computational Biological Chemistry, University of Vienna, Vienna A-1090, Austria
| | - Christian Schröder
- Faculty of Chemistry, Department of Computational Biological Chemistry, University of Vienna, Vienna A-1090, Austria
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17
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Nestor ST, Hawkins AN, Xhani X, Sykora RE, Mao JX, Nam K, McManus GJ, Mirjafari A. Studies on solubility and S-alkylation of 2-thiouracil in ionic liquids. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.06.026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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18
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Weyman A, Bier M, Holm C, Smiatek J. Microphase separation and the formation of ion conductivity channels in poly(ionic liquid)s: A coarse-grained molecular dynamics study. J Chem Phys 2018; 148:193824. [DOI: 10.1063/1.5016814] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Affiliation(s)
- Alexander Weyman
- Institute for Computational Physics, University of Stuttgart, Allmandring 3, D-70569 Stuttgart, Germany
- ETH Zürich, Department of Materials, Leopold-Ruzicka-Weg 4, CH-8093 Zürich, Switzerland
| | - Markus Bier
- Max Planck Institute for Intelligent Systems, Heisenbergstrasse 3, D-70569 Stuttgart, Germany
- Institute for Theoretical Physics IV, University of Stuttgart, Pfaffenwaldring 57, D-70569 Stuttgart, Germany
| | - Christian Holm
- Institute for Computational Physics, University of Stuttgart, Allmandring 3, D-70569 Stuttgart, Germany
| | - Jens Smiatek
- Institute for Computational Physics, University of Stuttgart, Allmandring 3, D-70569 Stuttgart, Germany
- Helmholtz Institute Muenster (HIMS-IEK 12), Forschungszentrum Juelich, Corrensstrasse 46, D-48149 Muenster, Germany
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19
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Liu J, Willcox JAL, Kim HJ. Heterogeneous dynamics of ionic liquids: A four-point time correlation function approach. J Chem Phys 2018; 148:193830. [DOI: 10.1063/1.5016501] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jiannan Liu
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Ave., Pittsburgh, Pennsylvania 15213, USA
| | - Jon A. L. Willcox
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Ave., Pittsburgh, Pennsylvania 15213, USA
| | - Hyung J. Kim
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Ave., Pittsburgh, Pennsylvania 15213, USA
- School of Computational Sciences, Korea Institute for Advanced Study, Seoul 02455, South Korea
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20
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Oprzeska-Zingrebe EA, Smiatek J. Aqueous ionic liquids in comparison with standard co-solutes : Differences and common principles in their interaction with protein and DNA structures. Biophys Rev 2018; 10:809-824. [PMID: 29611033 DOI: 10.1007/s12551-018-0414-7] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 03/12/2018] [Indexed: 12/29/2022] Open
Abstract
Ionic liquids (ILs) are versatile solvents for a broad range of biotechnological applications. Recent experimental and simulation results highlight the potential benefits of dilute ILs in aqueous solution (aqueous ILs) in order to modify protein and DNA structures systematically. In contrast to a limited number of standard co-solutes like urea, ectoine, trimethylamine-N-oxide (TMAO), or guanidinium chloride, the large amount of possible cation and anion combinations in aqueous ILs can be used to develop tailor-made stabilizers or destabilizers for specific purposes. In this review article, we highlight common principles and differences between aqueous ILs and standard co-solutes with a specific focus on their underlying macromolecular stabilization or destabilization behavior. In combination with statistical thermodynamics theories, we present an efficient framework, which is used to classify structure modification effects consistently. The crucial importance of enthalpic and entropic contributions to the free energy change upon IL-assisted macromolecular unfolding in combination with a complex destabilization mechanism is described in detail. A special focus is also set on aqueous IL-DNA interactions, for which experimental and simulation outcomes are summarized and discussed in the context of previous findings.
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Affiliation(s)
| | - Jens Smiatek
- Institute for Computational Physics, University of Stuttgart, Allmandring 3, 70569, Stuttgart, Germany. .,Helmholtz Institute Münster: Ionics in Energy Storage (HI MS - IEK 12), Forschungszentrum Jülich GmbH, Corrensstrasse 46, 48149, Münster, Germany.
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21
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Cheng HW, Weiss H, Stock P, Chen YJ, Reinecke CR, Dienemann JN, Mezger M, Valtiner M. Effect of Concentration on the Interfacial and Bulk Structure of Ionic Liquids in Aqueous Solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:2637-2646. [PMID: 29356544 DOI: 10.1021/acs.langmuir.7b03757] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Bio and aqueous applications of ionic liquids (IL) such as catalysis in micelles formed in aqueous IL solutions or extraction of chemicals from biologic materials rely on surface-active and self-assembly properties of ILs. Here, we discuss qualitative relations of the interfacial and bulk structuring of a water-soluble surface-active IL ([C8MIm][Cl]) on chemically controlled surfaces over a wide range of water concentrations using both force probe and X-ray scattering experiments. Our data indicate that IL structuring evolves from surfactant-like surface adsorption at low IL concentrations, to micellar bulk structure adsorption above the critical micelle concentration, to planar bilayer formation in ILs with <1 wt % of water and at high charging of the surface. Interfacial structuring is controlled by mesoscopic bulk structuring at high water concentrations. Surface chemistry and surface charges decisively steer interfacial ordering of ions if the water concentration is low and/or the surface charge is high. We also demonstrate that controlling the interfacial forces by using self-assembled monolayer chemistry allows tuning of interfacial structures. Both the ratio of the head group size to the hydrophobic tail volume as well as the surface charging trigger the bulk structure and offer a tool for predicting interfacial structures. Based on the applied techniques and analyses, a qualitative prediction of molecular layering of ILs in aqueous systems is possible.
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Affiliation(s)
- H-W Cheng
- Department for Interface Chemistry and Surface Engineering, Max Planck Institut für Eisenforschung GmbH , 40237 Düsseldorf, Germany
- Institute of Applied Physics, Vienna University of Technology , A-1040 Vienna, Austria
| | - H Weiss
- Max Planck Institute for Polymer Research , 55128 Mainz, Germany
| | - P Stock
- Department for Interface Chemistry and Surface Engineering, Max Planck Institut für Eisenforschung GmbH , 40237 Düsseldorf, Germany
| | - Y-J Chen
- Department for Interface Chemistry and Surface Engineering, Max Planck Institut für Eisenforschung GmbH , 40237 Düsseldorf, Germany
| | - C R Reinecke
- Department for Interface Chemistry and Surface Engineering, Max Planck Institut für Eisenforschung GmbH , 40237 Düsseldorf, Germany
| | - J-N Dienemann
- Department for Interface Chemistry and Surface Engineering, Max Planck Institut für Eisenforschung GmbH , 40237 Düsseldorf, Germany
| | - M Mezger
- Max Planck Institute for Polymer Research , 55128 Mainz, Germany
- Institute of Physics, Johannes Gutenberg University Mainz , 55128 Mainz, Germany
| | - M Valtiner
- Department for Interface Chemistry and Surface Engineering, Max Planck Institut für Eisenforschung GmbH , 40237 Düsseldorf, Germany
- Institute of Applied Physics, Vienna University of Technology , A-1040 Vienna, Austria
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22
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Diddens D, Lesch V, Heuer A, Smiatek J. Aqueous ionic liquids and their influence on peptide conformations: denaturation and dehydration mechanisms. Phys Chem Chem Phys 2018; 19:20430-20440. [PMID: 28737791 DOI: 10.1039/c7cp02897k] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Low concentrated aqueous ionic liquids (ILs) and their influence on protein structures have attracted a lot of interest over the last few years. This can be mostly attributed to the fact that aqueous ILs, depending on the ion species involved, can be used as protein protectants or protein denaturants. Atomistic molecular dynamics (MD) simulations are performed in order to study the influence of different aprotic ILs on the properties of a short hairpin peptide. Our results reveal distinct binding and denaturation effects for 1-ethyl-3-methylimidazolium (EMIM) in combination with different anions, namely, chloride (CL), tetrafluoroborate (BF4) and acetate (ACE). The simulation outcomes demonstrate that the studied ILs with larger anions reveal a more pronounced accumulation behavior of the individual ion species around the peptide, which is accomplished by a stronger dehydration effect. We can relate these findings to the implications of the Kirkwood-Buff theory, which provides a thermodynamic explanation for the denaturation strength in terms of the IL accumulation behavior. The results for the spatial distribution functions, the binding energies and the local/bulk partition coefficients are in good agreement with metadynamics simulations in order to determine the energetically most stable peptide conformations. The free energy landscapes indicate a decrease of the denaturation strength in the order EMIM/ACE, EMIM/BF4 and EMIM/CL, which coincides with a decreasing size of the anion species. An analysis of the potential binding energies reveals that this effect is mainly of enthalpic nature.
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Affiliation(s)
- Diddo Diddens
- Institute of Physical Chemistry, University of Münster, Corrensstrasse 28/30, 48149 Münster, Germany
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23
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Krishnamoorthy AN, Zeman J, Holm C, Smiatek J. Preferential solvation and ion association properties in aqueous dimethyl sulfoxide solutions. Phys Chem Chem Phys 2018; 18:31312-31322. [PMID: 27824183 DOI: 10.1039/c6cp05909k] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
We study the solvation and the association properties of ion pairs in aqueous dimethyl sulfoxide (DMSO) solution by atomistic molecular dynamics (MD) simulations. The ion pair is composed of two lithium and a single sulfonated diphenyl sulfone ion whose properties are studied under the influence of different DMSO concentrations. For increasing mole fractions of DMSO, we observe a non-ideal behavior of the solution as indicated by the derivatives of the chemical activity. Our findings are complemented by dielectric spectra, which also verify a complex DMSO-water mixing behavior. In agreement with these results, further simulation outcomes reveal an aqueous homoselective solvation of the ion species which fosters the occurrence of pronounced ion association constants at higher DMSO mole fractions. The consequences of this finding are demonstrated by lower ionic conductivities for increasing concentrations of DMSO.
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Affiliation(s)
| | - Johannes Zeman
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany.
| | - Christian Holm
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany.
| | - Jens Smiatek
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany.
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24
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Uhlig F, Zeman J, Smiatek J, Holm C. First-Principles Parametrization of Polarizable Coarse-Grained Force Fields for Ionic Liquids. J Chem Theory Comput 2018; 14:1471-1486. [DOI: 10.1021/acs.jctc.7b00903] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Frank Uhlig
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Johannes Zeman
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Jens Smiatek
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Christian Holm
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany
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25
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Narayanan Kirshnamoorthy A, Oldiges K, Winter M, Heuer A, Cekic-Laskovic I, Holm C, Smiatek J. Electrolyte solvents for high voltage lithium ion batteries: ion correlation and specific anion effects in adiponitrile. Phys Chem Chem Phys 2018; 20:25701-25715. [DOI: 10.1039/c8cp04102d] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Combined atomistic molecular dynamics, quantum chemical, and experimental study regarding the properties of two lithium conducting salts in high voltage electrolyte solvent adiponitrile.
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Affiliation(s)
| | - Kristina Oldiges
- Helmholtz Institute Münster (HI MS): Ionics in Energy Storage
- Forschungszentrum Jülich GmbH
- 48149 Münster
- Germany
| | - Martin Winter
- Helmholtz Institute Münster (HI MS): Ionics in Energy Storage
- Forschungszentrum Jülich GmbH
- 48149 Münster
- Germany
- MEET Battery Research Centre
| | - Andreas Heuer
- Institute of Physical Chemistry
- University of Münster
- 48149 Münster
- Germany
| | - Isidora Cekic-Laskovic
- Helmholtz Institute Münster (HI MS): Ionics in Energy Storage
- Forschungszentrum Jülich GmbH
- 48149 Münster
- Germany
| | - Christian Holm
- Institute for Computational Physics
- University of Stuttgart
- 70569 Stuttgart
- Germany
| | - Jens Smiatek
- Institute for Computational Physics
- University of Stuttgart
- 70569 Stuttgart
- Germany
- Helmholtz Institute Münster (HI MS): Ionics in Energy Storage
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26
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Smiatek J. Aqueous ionic liquids and their effects on protein structures: an overview on recent theoretical and experimental results. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:233001. [PMID: 28398214 DOI: 10.1088/1361-648x/aa6c9d] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ionic liquids (ILs) are used in a variety of technological and biological applications. Recent experimental and simulation results reveal the influence of aqueous ionic liquids on the stability of protein and enzyme structures. Depending on different parameters like the concentration and the ion composition, one can observe distinct stabilization or denaturation mechanisms for various ILs. In this review, we summarize the main findings and discuss the implications with regard to molecular theories of solutions and specific ion effects. A preferential binding model is introduced in order to discuss protein-IL effects from a statistical mechanics perspective. The value of the preferential binding coefficient determines the strength of the ion influence and indicates a shift of the chemical equilibrium either to the native or the denatured state of the protein. We highlight the role of water in order to explain the self-association behavior of the IL species and discuss recent experimental and simulation results in the light of the observed binding effects.
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Affiliation(s)
- Jens Smiatek
- Institute for Computational Physics, University of Stuttgart, Allmandring 3, D-70569 Stuttgart, Germany
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27
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Thermodynamic properties of glycine and diglycine in aqueous solutions of 1-pentyl-3-methylimidazolium chloride at different temperatures. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.12.066] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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28
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Egorova KS, Gordeev EG, Ananikov VP. Biological Activity of Ionic Liquids and Their Application in Pharmaceutics and Medicine. Chem Rev 2017; 117:7132-7189. [PMID: 28125212 DOI: 10.1021/acs.chemrev.6b00562] [Citation(s) in RCA: 906] [Impact Index Per Article: 129.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Ionic liquids are remarkable chemical compounds, which find applications in many areas of modern science. Because of their highly tunable nature and exceptional properties, ionic liquids have become essential players in the fields of synthesis and catalysis, extraction, electrochemistry, analytics, biotechnology, etc. Apart from physical and chemical features of ionic liquids, their high biological activity has been attracting significant attention from biochemists, ecologists, and medical scientists. This Review is dedicated to biological activities of ionic liquids, with a special emphasis on their potential employment in pharmaceutics and medicine. The accumulated data on the biological activity of ionic liquids, including their antimicrobial and cytotoxic properties, are discussed in view of possible applications in drug synthesis and drug delivery systems. Dedicated attention is given to a novel active pharmaceutical ingredient-ionic liquid (API-IL) concept, which suggests using traditional drugs in the form of ionic liquid species. The main aim of this Review is to attract a broad audience of chemical, biological, and medical scientists to study advantages of ionic liquid pharmaceutics. Overall, the discussed data highlight the importance of the research direction defined as "Ioliomics", studies of ions in liquids in modern chemistry, biology, and medicine.
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Affiliation(s)
- Ksenia S Egorova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky prospect 47, Moscow 119991, Russia
| | - Evgeniy G Gordeev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky prospect 47, Moscow 119991, Russia
| | - Valentine P Ananikov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky prospect 47, Moscow 119991, Russia.,Department of Chemistry, Saint Petersburg State University , Stary Petergof 198504, Russia
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29
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Zeindlhofer V, Khlan D, Bica K, Schröder C. Computational analysis of the solvation of coffee ingredients in aqueous ionic liquid mixtures. RSC Adv 2017; 7:3495-3504. [PMID: 28496974 PMCID: PMC5361174 DOI: 10.1039/c6ra24736a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 10/29/2016] [Indexed: 12/19/2022] Open
Abstract
In this paper, we investigate the solvation of coffee ingredients including caffeine, gallic acid as representative for phenolic compounds and quercetin as representative for flavonoids in aqueous mixtures of the ionic liquid 1-ethyl-3-methylimidazolium acetate [C2mim][OAc] at various concentrations. Due to the anisotropy of the solutes we show that classical Kirkwood-Buff theory is not appropriate to study solvation effects with increasing ionic liquid content. However, excess coordination numbers as well as the mean residence time of solvent molecules at the surface of the solutes can be determined by Voronoi tessellation. Since the volume of the hydration shells is also available by this method, solvation free energies will be discussed as a function of the ionic liquid concentration to yield a physical meaningful picture of solvation for the anisotropic solutes. Hydrogen bonding capabilities of the solutes and their relevance for experimental extraction yields from spent coffee grounds are also discussed.
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Affiliation(s)
- Veronika Zeindlhofer
- University of Vienna , Faculty of Chemistry , Department of Computational Biological Chemistry , Währingerstraße 19 , 1090 Vienna , Austria . ; Tel: +43 14277 52711
| | - Diana Khlan
- Institute of Applied Synthetic Chemistry , Vienna University of Technology , Getreidemarkt 9/163 , 1060 Vienna , Austria
| | - Katharina Bica
- Institute of Applied Synthetic Chemistry , Vienna University of Technology , Getreidemarkt 9/163 , 1060 Vienna , Austria
| | - Christian Schröder
- University of Vienna , Faculty of Chemistry , Department of Computational Biological Chemistry , Währingerstraße 19 , 1090 Vienna , Austria . ; Tel: +43 14277 52711
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30
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Reid JESJ, Gammons RJ, Slattery JM, Walker AJ, Shimizu S. Interactions in Water–Ionic Liquid Mixtures: Comparing Protic and Aprotic Systems. J Phys Chem B 2017; 121:599-609. [DOI: 10.1021/acs.jpcb.6b10562] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Joshua E. S. J. Reid
- York
Structural Biology Laboratory, Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
- TWI Ltd., Granta Park, Great Abington, Cambridge, CB21 6AL, U.K
| | - Richard J. Gammons
- Department
of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - John M. Slattery
- Department
of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - Adam J. Walker
- TWI Ltd., Granta Park, Great Abington, Cambridge, CB21 6AL, U.K
| | - Seishi Shimizu
- York
Structural Biology Laboratory, Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
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31
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Kobayashi T, Reid JESJ, Shimizu S, Fyta M, Smiatek J. The properties of residual water molecules in ionic liquids: a comparison between direct and inverse Kirkwood–Buff approaches. Phys Chem Chem Phys 2017; 19:18924-18937. [DOI: 10.1039/c7cp03717a] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Atomistic molecular dynamics simulations of aqueous ionic liquid mixtures were performed in order to compare the resulting Kirkwood–Buff integrals with experimental data and the corresponding integrals derived by an inverse Kirkwood–Buff approach.
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Affiliation(s)
- Takeshi Kobayashi
- Institute for Computational Physics
- University of Stuttgart
- 70569 Stuttgart
- Germany
| | - Joshua E. S. J. Reid
- York Structural Biology Laboratory
- Department of Chemistry
- University of York
- York YO10 5DD
- UK
| | - Seishi Shimizu
- York Structural Biology Laboratory
- Department of Chemistry
- University of York
- York YO10 5DD
- UK
| | - Maria Fyta
- Institute for Computational Physics
- University of Stuttgart
- 70569 Stuttgart
- Germany
| | - Jens Smiatek
- Institute for Computational Physics
- University of Stuttgart
- 70569 Stuttgart
- Germany
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32
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Lesch V, Montes-Campos H, Méndez-Morales T, Gallego LJ, Heuer A, Schröder C, Varela LM. Molecular dynamics analysis of the effect of electronic polarization on the structure and single-particle dynamics of mixtures of ionic liquids and lithium salts. J Chem Phys 2016; 145:204507. [DOI: 10.1063/1.4968393] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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33
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Norman SE, Turner AH, Holbrey JD, Youngs TGA. Solvation Structure of Uracil in Ionic Liquids. Chemphyschem 2016; 17:3923-3931. [PMID: 27643394 DOI: 10.1002/cphc.201600984] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Indexed: 11/12/2022]
Abstract
The local solvation environment of uracil dissolved in the ionic liquid 1-ethyl-3-methylimidazolium acetate has been studied using neutron diffraction techniques. At solvent:solute (ionic liquid:uracil) ratios of 3:1 and 2:1, little perturbation of the ion-ion correlations compared to those of the neat ionic liquid are observed. We find that solvation of the uracil is driven predominantly by the acetate anion of the solvent. While short distance correlations exist between uracil and the imidazolium cation, the geometry of these contacts suggest that they cannot be considered as hydrogen bonds, in contrast to other studies by Araújo et al. (J. M. Araújo, A. B. Pereiro, J. N. Canongia-Lopes, L. P. Rebelo, I. M. Marrucho, J. Phys. Chem. B 2013, 117, 4109-4120). Nevertheless, this combination of interactions of the solute with both the cation and anion components of the solvents helps explain the high solubility of the nucleobase in this media. In addition, favourable uracil-uracil contacts are observed, of similar magnitude to those between cation and uracil, and are also likely to aid dissolution.
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Affiliation(s)
- Sarah E Norman
- ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire, OX11 0QX, UK.,School of Chemistry and Chemical Engineering, David Keir Building, Queen's University Belfast, Belfast, Northern Ireland, BT9 5AG, UK
| | - Adam H Turner
- School of Chemistry and Chemical Engineering, David Keir Building, Queen's University Belfast, Belfast, Northern Ireland, BT9 5AG, UK
| | - John D Holbrey
- School of Chemistry and Chemical Engineering, David Keir Building, Queen's University Belfast, Belfast, Northern Ireland, BT9 5AG, UK
| | - Tristan G A Youngs
- ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire, OX11 0QX, UK
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34
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Wang YL, Sarman S, Kloo L, Antzutkin ON, Glavatskih S, Laaksonen A. Solvation structures of water in trihexyltetradecylphosphonium-orthoborate ionic liquids. J Chem Phys 2016. [DOI: 10.1063/1.4960506] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Yong-Lei Wang
- Applied Physical Chemistry, Department of Chemistry, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
- System and Component Design, Department of Machine Design, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
| | - Sten Sarman
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Lars Kloo
- Applied Physical Chemistry, Department of Chemistry, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
| | - Oleg N. Antzutkin
- Chemistry of Interfaces, Luleå University of Technology, SE-971 87 Luleå, Sweden
| | - Sergei Glavatskih
- System and Component Design, Department of Machine Design, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
| | - Aatto Laaksonen
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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35
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Lesch V, Heuer A, Rad BR, Winter M, Smiatek J. Atomistic insights into deep eutectic electrolytes: the influence of urea on the electrolyte salt LiTFSI in view of electrochemical applications. Phys Chem Chem Phys 2016; 18:28403-28408. [DOI: 10.1039/c6cp04217a] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We study the properties of LiTFSI in combination with urea. For specific molar ratios, a deep eutectic electrolyte is formed which is investigatedviaatomistic molecular dynamics simulations.
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Affiliation(s)
- Volker Lesch
- Helmholtz-Institute Muenster (IEK-12): Ionics in Energy Storage
- Forschungszentrum Juelich
- 48153 Muenster
- Germany
| | - Andreas Heuer
- Helmholtz-Institute Muenster (IEK-12): Ionics in Energy Storage
- Forschungszentrum Juelich
- 48153 Muenster
- Germany
- Institute of Physical Chemistry
| | - Babak R. Rad
- Helmholtz-Institute Muenster (IEK-12): Ionics in Energy Storage
- Forschungszentrum Juelich
- 48153 Muenster
- Germany
| | - Martin Winter
- Helmholtz-Institute Muenster (IEK-12): Ionics in Energy Storage
- Forschungszentrum Juelich
- 48153 Muenster
- Germany
- MEET Battery Research Centre
| | - Jens Smiatek
- Institute for Computational Physics
- University of Stuttgart
- 70569 Stuttgart
- Germany
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36
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Lesch V, Li Z, Bedrov D, Borodin O, Heuer A. The influence of cations on lithium ion coordination and transport in ionic liquid electrolytes: a MD simulation study. Phys Chem Chem Phys 2016; 18:382-92. [DOI: 10.1039/c5cp05111h] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The dynamical and structural properties in two ionic liquid electrolytes (ILEs) based on [emim][TFSI] and [pyr13][TFSI] were compared as a function of LiTFSI salt concentrations using atomistic molecular dynamics (MD) simulations.
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Affiliation(s)
- Volker Lesch
- Institut für Energie- und Klimaforschung, Ionics in Energy Storage
- Helmholtz Institut Münster
- Forschungszentrum Jülich
- 48149 Muenster
- Germany
| | - Zhe Li
- Department of Materials Science & Engineering
- University of Utah
- Salt Lake City
- USA
| | - Dmitry Bedrov
- Department of Materials Science & Engineering
- University of Utah
- Salt Lake City
- USA
| | - Oleg Borodin
- U. S. Army Research Laboratory
- Electrochemistry Branch
- Sensors & Electron Devices Directorate
- Adelphi
- USA
| | - Andreas Heuer
- Institute of Physical Chemistry
- Westfälische Wilhelms-Universität Münster
- 48149 Muenster
- Germany
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37
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Lesch V, Heuer A, Holm C, Smiatek J. Properties of Apolar Solutes in Alkyl Imidazolium-Based Ionic Liquids: The Importance of Local Interactions. Chemphyschem 2015; 17:387-94. [DOI: 10.1002/cphc.201501021] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 12/02/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Volker Lesch
- Helmholtz-Institut Münster: Ionics in Energy Storage (IEK-12); Forschungszentrum Jülich, Münster (Germany)
- Institute of Physical Chemistry; University of Münster; Münster Germany
| | - Andreas Heuer
- Institute of Physical Chemistry; University of Münster; Münster Germany
| | - Christian Holm
- Institute for Computational Physics; University of Stuttgart; Stuttgart Germany
| | - Jens Smiatek
- Institute for Computational Physics; University of Stuttgart; Stuttgart Germany
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38
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Lesch V, Heuer A, Tatsis VA, Holm C, Smiatek J. Peptides in the presence of aqueous ionic liquids: tunable co-solutes as denaturants or protectants? Phys Chem Chem Phys 2015; 17:26049-53. [DOI: 10.1039/c5cp03838c] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We studied the stability of a small β-hairpin peptide under the influence of an aqueous 1-ethyl-3-methylimidazolium acetate solution via all-atom molecular dynamics simulations. A significant structure dependent binding of ACE to the peptide was identified as the main reason for the denaturation of the native conformation.
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Affiliation(s)
- Volker Lesch
- Institut für Physikalische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Andreas Heuer
- Institut für Physikalische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Vasileios A. Tatsis
- Institut für Physikalische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Christian Holm
- Institut für Computerphysik
- Universität Stuttgart
- D-70569 Stuttgart
- Germany
| | - Jens Smiatek
- Institut für Computerphysik
- Universität Stuttgart
- D-70569 Stuttgart
- Germany
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