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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: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [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: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [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] [What about the content of this article? (0)] [Affiliation(s)] [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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Honti B, Idrissi A, Jedlovszky P. Calculation of the Free Energy of Mixing as a Tool for Assessing and Improving Potential Models: The Case of the N, N-Dimethylformamide-Water System. J Phys Chem B 2021; 125:4819-4830. [PMID: 33947181 DOI: 10.1021/acs.jpcb.1c01749] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The Helmholtz free energy, energy, and entropy of mixing of N,N-dimethylformamide (DMF) and water are calculated in the entire composition range by means of Monte Carlo computer simulations and thermodynamic integration using all possible combinations of five DMF and three widely used water models. Our results reveal that the mixing of DMF and water is highly non-ideal. Thus, in their dilute solutions, both molecules induce structural ordering of the major component, as evidenced by the concomitant decrease in the entropy. Among the 15 model combinations considered, only 4 reproduce the well-known full miscibility of DMF and water, 3 of which strongly exaggerate the thermodynamic driving force of the miscibility. Thus, the combination of the CS2 model of DMF and the TIP4P/2005 water model reproduces the properties of the DMF-water mixtures far better than the other combinations tested. Our results also reveal that moving a fractional negative charge from the N atom to the O atom of the DMF molecule, leading to the increase in its dipole moment, improves the miscibility of the model with water. Starting from the CS2 model and optimizing the charge to be moved, we propose a new model of DMF that reproduces very accurately both the Helmholtz free energy of mixing of aqueous DMF solutions in the entire composition range (when used in combination with the TIP4P/2005 water model) and also the internal energy of neat DMF.
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Affiliation(s)
- Barbara Honti
- Budapest University of Technology and Economics, Szt. Gellért tér 4, H-1111 Budapest, Hungary
| | - 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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Tomar D, Rana B, Jena KC. The structure of water–DMF binary mixtures probed by linear and nonlinear vibrational spectroscopy. J Chem Phys 2020; 152:114707. [DOI: 10.1063/1.5141757] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Deepak Tomar
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
| | - Bhawna Rana
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
| | - Kailash C. Jena
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
- Center for Biomedical Engineering, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
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Geethu PM, Ranganathan VT, Satapathy DK. Inferences on hydrogen bond networks in water from isopermitive frequency investigations. J Phys Condens Matter 2018; 30:315103. [PMID: 29944119 DOI: 10.1088/1361-648x/aacf2c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Intermolecular hydrogen bonds play a crucial role in determining the unique characteristics of liquid water. We present low-frequency (1 Hz-40 MHz) dielectric spectroscopic investigations on water in the presence and absence of added solutes at different temperatures from 10 °C to 60 °C. The intersection points of temperature dependent permittivity contours at the vicinity of isopermitive frequency (IPF) in water are recorded and its properties are presumed to be related to the extent of hydrogen bond networks in water. IPF is defined as the frequency at which the relative permittivity of water is almost independent of temperature. The set of intersection points of temperature dependent permittivity contours at the vicinity of IPF are characterized by the mean [Formula: see text] and root-mean-square deviation/standard deviation [Formula: see text] associated with IPF. The tunability of M IPF by the addition of NaCl and MgCl2 salt emphasizes the strong correlation between the concentration of ions in water and the M IPF. The [Formula: see text] is surmised to be related to the orientational correlations of water dipoles as well as to the intermolecular hydrogen bond networks in water. Further, alterations in [Formula: see text] is observed with the addition of kosmotropic and chaotropic solutes into water and are thought to arise due to the restructuring of hydrogen bond networks in water in presence of added solutes. Notably, the solute induced reconfiguration of hydrogen bond networks in water or often-discussed structure making/breaking effects of the added solutes in water can be inferred, albeit qualitatively, by examining the M IPF and [Formula: see text]. Further, the Gaussian deconvoluted OH-stretching modes present in the Raman spectra of water and aqueous solutions of IPA and DMF strongly endorses the structural rearrangements occurring in water in presence of kosmotropes and chaotropes and are in line with the results derived from the root-mean-square deviation in IPF.
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Affiliation(s)
- P M Geethu
- Soft Materials Laboratory, Department of Physics, Indian Institute of Technology Madras, 600036, India
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Nusrat Mafy N, Muhibur Rahman M, Mollah MYA, Susan MABH. Temperature Perturbation on Hydrogen Bonding in Aqueous Solutions at Different Amide Concentrations. ChemistrySelect 2016. [DOI: 10.1002/slct.201601136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Noushaba Nusrat Mafy
- Department of Chemistry; University of Dhaka; Dhaka 1000 Bangladesh, (M.A.B.H. Susan
| | - M. Muhibur Rahman
- University Grants Commission of Bangladesh, 29/1 Agargaon; Sher-E-Banglanagar Dhaka 1207 Bangladesh
| | - M. Yousuf A. Mollah
- University Grants Commission of Bangladesh, 29/1 Agargaon; Sher-E-Banglanagar Dhaka 1207 Bangladesh
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Jacewicz D, Pranczk J, Wyrzykowski D, Żamojć K, Chmurzyński L. Thermal properties of [Co(en)2Cl2]Cl in solid state. Cis–trans isomerization of the [Co(en)2Cl2]+ complex ion in methanol. Reac Kinet Mech Cat 2014. [DOI: 10.1007/s11144-014-0742-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Terashima Y, Takeda K, Honda M. Raman and density functional theory studies of solvation structure and ion association of NaClO4 in 1,2-propanediamine. Chem Phys 2014. [DOI: 10.1016/j.chemphys.2013.12.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Molinou IE, Tsierkezos NG. Study of the interactions of sodium thiocyanate, potassium thiocyanate and ammonium thiocyanate in water+N,N-dimethylformamide mixtures by Raman spectroscopy. Spectrochim Acta A Mol Biomol Spectrosc 2008; 71:954-958. [PMID: 18420453 DOI: 10.1016/j.saa.2008.02.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2007] [Revised: 02/06/2008] [Accepted: 02/13/2008] [Indexed: 05/26/2023]
Abstract
Raman spectra of water+N,N-dimethylformamide (DMF) mixtures and their solutions with NaNCS, KNCS and NH(4)NCS were obtained. The bands of nu(CO) stretching, delta(OCN) bending, r(CH(3)) rocking and nu(N-CH)(3)) stretching of the DMF molecule with and without salts were studied. The dependence of the vibration frequencies and Raman intensities of the bands on the composition of the mixed solvent was discussed. The change of the band frequencies as a result of the presence of the salts and the solvation of the cations by the solvent molecules was examined. The stronger cation solvation by the aprotic solvent molecules instead of the water molecules in DMF concentrated solutions was discussed. The nu(CN) and nu(CS) vibrations of the SCN(-) ions were observed as a function of the cation present and the solvent composition. The presence of the SCN(-) ions as "free", contact ion pairs, or solvent separated pairs, was discussed.
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Affiliation(s)
- Ioanna E Molinou
- Physical Chemistry Laboratory, Department of Chemistry, University of Athens, P.O. Box 64004, 15710 Zografou, Athens, Greece.
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Zaichikov AM, Krest’yaninov MA. Structural and thermodynamic parameters and intermolecular interactions in aqueous formic acid amides. J STRUCT CHEM+ 2008; 49:285-95. [DOI: 10.1007/s10947-008-0125-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Izutsu K. Liquid Junction Potential between Electrolyte Solutions in Different Solvents Studied by Use of Mixed Solvent/Pure Solvent Junctions. BCSJ 2008. [DOI: 10.1246/bcsj.81.703] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Sharma A, Kaur S, Mahajan CG, Tripathi SK, Saini GSS. Fourier transform infrared spectral study of N,N′-dimethylformamide-water-rhodamine 6G mixture. Mol Phys 2007. [DOI: 10.1080/00268970601146856] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- A. Sharma
- Department of Physics, Panjab University, Chandigarh, India
| | - S. Kaur
- Department of Physics, Panjab University, Chandigarh, India
| | - C. G. Mahajan
- Department of Physics, Panjab University, Chandigarh, India
| | - S. K. Tripathi
- Department of Physics, Panjab University, Chandigarh, India
| | - G. S. S. Saini
- Department of Physics, Panjab University, Chandigarh, India
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Xu Z, Li H, Wang C, Pan H, Han S. The methyl C–H blueshift in N,N-dimethylformamide-water mixtures probed by two-dimensional Fourier-transform infrared spectroscopy. J Chem Phys 2006; 124:244502. [PMID: 16821984 DOI: 10.1063/1.2206177] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Two-dimensional correlation spectroscopy was used to study the composition-dependent spectral variations of the CH-stretching bands of N,N-dimethylformamide (DMF)-water mixtures with X(DMF) ranging from 0.98 to 0.60. By a detailed correlation analysis of the spectral changes of the CH- and OH-stretching bands, it is found that the intensities of the CH and OH bands change in different ways when the water content is increased. It is also found that two different regions of the water content can be distinguished, in which the intensity changes have different signatures. A tentative explanation for how these phenomena might be related to structural changes in the mixture is proposed. The structural change of DMF induced by the water hydrogen bonded on the carbonyl group is supposed to be the possible origin of the methyl C-H blueshift instead of the direct C-H...O interactions before the hydrophobic hydration takes place.
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Affiliation(s)
- Zheng Xu
- Department of Chemistry, Zhejiang University, Hangzhou 310027, People's Republic of China
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