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Skarmoutsos I, Karvounis IG. Solvation Structure and Dynamics of the Thiocyanate Anion in mixed N,N-Dimethylformamide-Water Solvents: A Molecular Dynamics Approach. Chemphyschem 2025; 26:e202400732. [PMID: 39714900 PMCID: PMC11913473 DOI: 10.1002/cphc.202400732] [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: 07/17/2024] [Revised: 12/19/2024] [Accepted: 12/20/2024] [Indexed: 12/24/2024]
Abstract
The solvation structure and dynamics of the thiocyanate anion at infinite dilution in mixed N, N-Dimethylformamide (DMF)-water liquid solvents was studied using classical molecular dynamics simulation techniques. The results obtained have indicated a preferential solvation of the thiocyanate anions by the water molecules, due to strong hydrogen bonding interactions between the anion and water molecules. A first hydration shell at short intermolecular distances is formed around the SCN- anion consisting mainly by water molecules, followed by a second shell consisting by both DMF and water molecules. The strong interactions between the thiocyanate anion and water molecules are further reflected upon the calculated intermittent residence lifetimes of water and DMF in the first and second solvation shells. The dependence of the reorientational relaxation times of the thiocyanate anion upon the mole fraction of DMF in the mixtures has been found to be in good agreement with experiment, revealing strong concentration effects upon these relaxation phenomena. An appreciable solvent composition effect upon the low frequency intermolecular vibrations, due to the anion-water interactions, has also been revealed by calculating the atomic velocity correlation functions and corresponding spectral densities of the anion.
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Affiliation(s)
- Ioannis Skarmoutsos
- Laboratory of Physical Chemistry, Department of Chemistry, University of Ioannina, 45110, Ioannina, Greece
| | - Ilias G Karvounis
- Laboratory of Physical Chemistry, Department of Chemistry, University of Ioannina, 45110, Ioannina, Greece
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2
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Honti B, Fábián B, Idrissi A, Jedlovszky P. Surface Properties of N,N-Dimethylformamide-Water Mixtures, As Seen from Computer Simulations. J Phys Chem B 2023; 127:1050-1062. [PMID: 36652674 DOI: 10.1021/acs.jpcb.2c07572] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The liquid-vapor interface of N,N-dimethylformamide (DMF)-water mixtures, spanning the entire composition range, is investigated in detail at 298 K by molecular dynamics simulation and intrinsic surface analysis. DMF molecules are found to adsorb strongly at the liquid surface, but this adsorption extends only to the first molecular layer. Water and DMF molecules mix with each other on the molecular scale even in the surface layer; thus, no marked self-association of any of the components is seen at the liquid surface. The major surface component prefers such orientation in which the molecular dipole vector lays parallel with the macroscopic plane of the surface. On the other hand, the preferred orientation of the minor component is determined, at both ends of the composition range, by the possibility of H-bond formation with the major component. The lack of H-donating ability of DMF leads to a rapid breakup of the percolating H-bond network at the surface; due to the strong adsorption of DMF, this breakup occurs below the bulk phase DMF mole fraction of 0.03. The disruption of the surface H-bond network also accelerates the exchange of both species between the liquid surface and bulk liquid phase, although, for water, this effect becomes apparent only above a bulk phase DMF mole fraction of 0.4. H-bonds formed by a DMF and a water molecule live, on average, 25-60% longer than those formed by two water molecules at the liquid surface. A similar, but smaller (i.e., about 10-20%) difference is seen in the bulk liquid phase. The enhanced surface mobility of the molecules results in 2-6 times larger diffusion coefficient and 2-5 times shorter H-bond lifetime values at the liquid surface than in the bulk liquid phase. The diffusion of both molecules is slowed down in the presence of the other species; in the case of DMF, this effect is caused by the formation of water-DMF H-bonds, whereas for water, steric hindrances imposed by the bulky DMF neighbors are responsible for this slowing down.
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Affiliation(s)
- Barbara Honti
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest 1111, Hungary
| | - Balázs Fábián
- Department of Theoretical Biophysics, Max Planck Institute of Biophysics, Frankfurt am Main 60438, Germany
| | - Abdenacer Idrissi
- University of Lille, CNRS UMR 8516 -LASIRe - Laboratoire Avancé de Spectroscopie pour les Interactions la Réactivité et l'environnement, 59000 Lille, France
| | - Pál Jedlovszky
- Department of Chemistry, Eszterházy Károly University, Leányka u. 6, H-3300 Eger, Hungary
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Bai Y, Zhou D, Mukherjee S, Liu J, Bian H, Fang Y. Distinct Hydrogen Bonding Dynamics Underlies the Microheterogeneity in DMF-Water Mixtures. J Phys Chem B 2022; 126:9663-9672. [PMID: 36351006 DOI: 10.1021/acs.jpcb.2c06335] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The hydrogen bonding interaction between the amide functional group and water is fundamental to understanding the liquid-liquid heterogeneity in biological systems. Herein, the structure and dynamics of the N,N-dimethylformamide (DMF)-water mixtures have been investigated by linear and nonlinear IR spectroscopies, using the hydroxyl stretch and extrinsic probe of thiocyanate as local vibrational reporters. According to vibrational relaxation dynamics measurements, the orientational dynamics of water is not directly tied to those of DMF molecules. Wobbling-in-a-cone analysis demonstrates that the water molecules have varying degrees of angular restriction depending on their composition due to the formation of specific water-DMF networks. Because of the preferential solvation by DMF molecules, the rotational dynamics of the extrinsic probe is slowed significantly, and its rotational time constants are correlated to the change of solution viscosity. The unique structural dynamics observed in the DMF-water mixtures is expected to provide important insights into the underlying mechanism of microscopic heterogeneity in binary mixtures.
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Affiliation(s)
- Yimin Bai
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an710119, China
| | - Dexia Zhou
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an710119, China
| | - Somnath Mukherjee
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an710119, China
| | - Jing Liu
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an710119, China
| | - Hongtao Bian
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an710119, China
| | - Yu Fang
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an710119, China
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Koverga V, Juhász Á, Dudariev D, Lebedev M, Idrissi A, Jedlovszky P. Local Structure of DMF-Water Mixtures, as Seen from Computer Simulations and Voronoi Analysis. J Phys Chem B 2022; 126:6964-6978. [PMID: 36044401 DOI: 10.1021/acs.jpcb.2c02235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Molecular dynamics simulations of mixtures of N,N-dimethylformamide (DMF) with water of various compositions, covering the entire composition range, are performed on the canonical (N,V,T) ensemble. The local structure of the mixtures is analyzed in terms of radial distribution functions and the contributions of the first five neighbors to them, various order parameters of the water molecules around each other, and properties of the Voronoi polyhedra of the molecules. The analyses lead to the following main conclusions. The two molecules are mixing with each other even on the molecular scale; however, small self-aggregates of both components persist even at their small mole fraction values. In particular, water-water H-bonds exist in the entire composition range, while water clusters larger than 3 and 2 molecules disappear above the DMF mole fraction values of about 0.7 and 0.9, respectively. The O atoms of the DMF molecules can well replace water O atoms in the hydrogen-bonding network. Further, the H-bonding structure is enhanced by the presence of the hydrophobic CH3 groups of the DMF molecules. On the other hand, the H-bonding network of the molecules gradually breaks down upon the addition of DMF to the system due to the lack of H-donating groups of the DMF molecules. Finally, in neat DMF, the molecules form weak, CH-donated H-bonds with each other; however, these H-bonds disappear upon the addition of water due to the increasing competition with the considerably stronger OH-donated H-bonds DMF can form with the water molecules.
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Affiliation(s)
- Volodymyr Koverga
- University of Lille, CNRS UMR 8516 - LASIRe─Laboratoire Avancé de Spectroscopie pour les Interactions la Réactivité et l'environnement, 59000 Lille, France
| | - Ákos Juhász
- University of Lille, CNRS UMR 8516 - LASIRe─Laboratoire Avancé de Spectroscopie pour les Interactions la Réactivité et l'environnement, 59000 Lille, France.,Department of Biophysics Radiation Biology, Laboratory of Nanochemistry, Semmelweis University, Nagyvárad tér 4, 1089 Budapest, Hungary
| | - Dmytro Dudariev
- University of Lille, CNRS UMR 8516 - LASIRe─Laboratoire Avancé de Spectroscopie pour les Interactions la Réactivité et l'environnement, 59000 Lille, France.,Department of Inorganic Chemistry, V.N. Karazin Kharkiv National University, Svoboda sq. 4, 61022 Kharkiv, Ukraine
| | - Maxim Lebedev
- University of Lille, CNRS UMR 8516 - LASIRe─Laboratoire Avancé de Spectroscopie pour les Interactions la Réactivité et l'environnement, 59000 Lille, France.,Department of Inorganic Chemistry, Laboratory of Luminescent Molecular Devices, Ivanovo State University of Chemistry and Technology, Sheremetievskiy Avenue 7, Ivanovo 153000, Russia
| | - Abdenacer Idrissi
- University of Lille, CNRS UMR 8516 - LASIRe─Laboratoire Avancé de Spectroscopie pour les Interactions la Réactivité et l'environnement, 59000 Lille, France
| | - Pál Jedlovszky
- Department of Chemistry, Eszterházy Károly University, Leányka u. 6, 3300 Eger, Hungary
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Lbadaoui-Darvas M, Idrissi A, Jedlovszky P. Computer Simulation of the Surface of Aqueous Ionic and Surfactant Solutions. J Phys Chem B 2022; 126:751-765. [PMID: 34904437 PMCID: PMC9161821 DOI: 10.1021/acs.jpcb.1c08553] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The surface of aqueous solutions of simple salts was not the main focus of scientific attention for a long while. Considerable interest in studying such systems has only emerged in the past two decades, following the pioneering finding that large halide ions, such as I-, exhibit considerable surface affinity. Since then, a number of issues have been clarified; however, there are still several unresolved points (e.g., the effect of various salts on lateral water diffusion at the surface) in this respect. Computer simulation studies of the field have largely benefited from the appearance of intrinsic surface analysis methods, by which the particles staying right at the boundary of the two phases can be unambiguously identified. Considering complex ions instead of simple ones opens a number of interesting questions, both from the theoretical point of view and from that of the applications. Besides reviewing the state-of-the-art of intrinsic surface analysis methods as well as the most important advances and open questions concerning the surface of simple ionic solutions, we focus on two such systems in this Perspective, namely, the surface of aqueous mixtures of room temperature ionic liquids and that of ionic surfactants. In the case of the former systems, for which computer simulation studies have still scarcely been reported, we summarize the theoretical advances that could trigger such investigations, which might well be of importance also from the point of view of industrial applications. Computer simulation methods are, on the other hand, widely used in studies of the surface of surfactant solutions. Here we review the most important theoretical advances and issues to be addressed and discuss two areas of applications, namely, the inclusion of information gathered from such simulations in large scale atmospheric models and the better understanding of the airborne transmission of viruses, such as SARS-CoV-2.
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Affiliation(s)
- Mária Lbadaoui-Darvas
- Laboratory
of Atmospheric Processes and their Impacts, EPFL, CH-1015 Lausanne, Switzerland
| | - Abdenacer Idrissi
- CNRS,
UMR 8516 -LASIRe - Laboratoire Avancé de Spectroscopie pour
les Interactions la Réactivité et l’environnement, University of Lille, F-5900 Lille, France
| | - Pál Jedlovszky
- Department
of Chemistry, Eszterházy Károly
University, Leányka utca 6, H-3300 Eger, Hungary,
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6
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Effect of the alkyl chain and composition on the thermodynamics of mixing of small alcohols and water. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116777] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Hantal G, Sega M, Horvai G, Jedlovszky P. Contribution of Different Molecules and Moieties to the Surface Tension in Aqueous Surfactant Solutions. II: Role of the Size and Charge Sign of the Counterions. J Phys Chem B 2021; 125:9005-9018. [PMID: 34319728 DOI: 10.1021/acs.jpcb.1c04216] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Understanding the role of the counterion species in surfactant solutions is a complicated task, made harder by the fact that, experimentally, it is not possible to vary independently bulk and surface quantities. Here, we perform molecular dynamics simulations at constant surface coverage of the liquid/vapor interface of lithium, sodium, potassium, rubidium, and cesium dodecyl sulfate aqueous solutions. We investigate the effect of counterion type and charge sign on the surface tension of the solution, analyzing the contribution of different species and moieties to the lateral pressure profile. The observed trends are qualitatively compatible with the Hofmeister series, with the notable exception of sodium. We point out a possible shortcoming of what is at the moment, in our experience, the most realistic nonpolarizable force field (CHARMM36) that includes the parametrization for the whole series of alkali counterions. In the artificial system where the counterion and surfactant charges are inverted in sign, the counterions become considerably harder. This charge inversion changes considerably the surface tension contributions of the counterions, surfactant headgroups, and water molecules, stressing the key role of the hardness of the counterions in this respect. However, the hydration free energy gain of the counterions, occurring upon charge inversion, is compensated by the concomitant free energy loss of the headgroups and water molecules, leading to a negligible change in the surface tension of the entire system.
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Affiliation(s)
- György Hantal
- Institute of Physics and Materials Science, University of Natural Resources and Life Sciences, Peter Jordan Straße 82, A-1190 Vienna, Austria.,Department of Chemistry, Eszterházy Károly University, Leányka utca 6, H-3300 Eger, Hungary
| | - Marcello Sega
- Forschungszentrum Jülich GmbH, Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11),Fürther Straße 248, D-90429 Nürnberg, Germany
| | - George Horvai
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, H-1111 Budapest, Hungary
| | - Pál Jedlovszky
- Department of Chemistry, Eszterházy Károly University, Leányka utca 6, H-3300 Eger, Hungary
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