1
|
Masood S, Saeed R, Ashfaq M, Bagum S, Khattak R, Khan SR. Conductometric Studies of Metal Sulfates in Aqueous, Aq-MeOH, Aq-PVOH, and Aq-PVOH + MeOH Systems. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2022. [DOI: 10.1134/s0036024421150176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
2
|
Alkali metal chlorides in DMSO–methanol binary mixtures: insights into the structural properties through molecular dynamics simulations. Theor Chem Acc 2021. [DOI: 10.1007/s00214-021-02856-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
3
|
Marques MS, Hernandes VF, Bordin JR. Core-softened water-alcohol mixtures: the solute-size effects. Phys Chem Chem Phys 2021; 23:16213-16223. [PMID: 34304261 DOI: 10.1039/d1cp00751c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Water is the most anomalous material on Earth, with a long list of thermodynamic, dynamic and structural behaviors that deviate from what is expected. Recent studies have indicated that these anomalies may be related to a competition between two liquids, which means that water has a potential liquid-liquid phase transition (LLPT) that ends at a liquid-liquid critical point (LLCP). In a recent study [J. Mol. Liq., 2020, 320, 114420], using molecular dynamics simulations and a core-softened potential approach, we have shown that adding a simple solute such as methanol can "kill" the density-anomalous behavior as the LLCP is suppressed by spontaneous crystallization in a hexagonal close packing (HCP) crystal near the LLPT. Now, we extend this work to realize how longer-chain alcohols will affect the complex behavior of water-alcohol mixtures in the supercooled regime. Besides core-softened (CS) methanol, ethanol and 1-propanol were added to a system of identical particles that interact through the continuous shouldered well (CSW) potential. We observed that the density anomaly gradually decreases its extension in phase diagrams until it disappears with the growth of the non-polar chain and the alcohol concentration, different from the liquid-liquid phase transition (and the LLCP), which remained present in all analyzed mixtures, according to Nature, 2001, 409, 692. For our model, the longer non-polar chains and higher concentrations gradually impact the competition between the scales in the CS potential, leading to a gradual disappearing of the anomalies until the TMD total disappearance is observed when the first coordination shell structure is also affected: short-range ordering is favored, leading to less competition between short- and long-range ordering and, consequently, to the extinction of anomalies. Also, the non-polar chain size and concentration have an effect on the solid phases, favoring the hexagonal close packed (HCP) solid and the amorphous solid phase over the body-centered cubic (BCC) crystal. These findings help to elucidate the behavior of water solutions in the supercooled regime and indicate that the LLCP can be observed in systems without density-anomalous behavior.
Collapse
Affiliation(s)
- Murilo S Marques
- Centro das Ciências Exatas e das Tecnologias, Universidade Federal do Oeste da Bahia, Rua da Prainha, 1392, Morada Nobre, CEP 47810-059, Barreiras-BA, Brazil.
| | | | | |
Collapse
|
4
|
Smirnov PR. Structure of the Nearest Environment of
Na+, K+,
Rb+, and Cs+ Ions in
Oxygen-Containing Solvents. RUSS J GEN CHEM+ 2020. [DOI: 10.1134/s1070363220090169] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
5
|
|
6
|
Christensen JN, Hofmann AE, DePaolo DJ. Isotopic Fractionation of Potassium by Diffusion in Methanol. ACS OMEGA 2019; 4:9497-9501. [PMID: 31172048 PMCID: PMC6545548 DOI: 10.1021/acsomega.9b00690] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Accepted: 05/09/2019] [Indexed: 06/01/2023]
Abstract
We present the results of experiments involving the isotopic fractionation by diffusion of K+ cations in methanol at 298 K along with supporting molecular dynamic simulations. The experiments, using glass Rayleigh fractionators filled with a methanol solution of KCl, constrain the ratio of the individual diffusivities of 41K and 39K (D 41K/D 39K) in methanol, and so the isotopic fractionation of K+ due to diffusion in methanol, to 0.9995 ± 0.0001. This isotopic fractionation is 25% of the fractionation resulting from K+ diffusion in water. This is consistent with published molecular dynamics simulations indicating greater hydrodynamic coupling between K+ ions and solvating methanol molecules compared to K+ ions and solvating water molecules.
Collapse
Affiliation(s)
- John N. Christensen
- Lawrence
Berkeley National Laboratory, I Cyclotron Rd., Berkeley, California 94720, United States
| | - Amy E. Hofmann
- Lawrence
Berkeley National Laboratory, I Cyclotron Rd., Berkeley, California 94720, United States
| | - Donald J. DePaolo
- Lawrence
Berkeley National Laboratory, I Cyclotron Rd., Berkeley, California 94720, United States
- Department
of Earth and Planetary Sciences, University
of California, Berkeley, Berkeley, California 94720, United States
| |
Collapse
|
7
|
Limiting Diffusion Coefficients for Ions and Nonelectrolytes in Solvents Water, Methanol, Ethanol, Propan-1-ol, Butan-1-ol, Octan-1-ol, Propanone and Acetonitrile at 298 K, Analyzed Using Abraham Descriptors. J SOLUTION CHEM 2019. [DOI: 10.1007/s10953-019-00884-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
8
|
Kumar P, Yashonath S. Ionic conductivity in aqueous electrolyte solutions: Insights from computer simulations. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.090] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
9
|
Biswas S, Mallik BS. Time-dependent vibrational spectral analysis of first principles trajectory of methylamine with wavelet transform. Phys Chem Chem Phys 2018; 19:9912-9922. [PMID: 28357425 DOI: 10.1039/c7cp00412e] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The fluctuation dynamics of amine stretching frequencies, hydrogen bonds, dangling N-D bonds, and the orientation profile of the amine group of methylamine (MA) were investigated under ambient conditions by means of dispersion-corrected density functional theory-based first principles molecular dynamics (FPMD) simulations. Along with the dynamical properties, various equilibrium properties such as radial distribution function, spatial distribution function, combined radial and angular distribution functions and hydrogen bonding were also calculated. The instantaneous stretching frequencies of amine groups were obtained by wavelet transform of the trajectory obtained from FPMD simulations. The frequency-structure correlation reveals that the amine stretching frequency is weakly correlated with the nearest nitrogen-deuterium distance. The frequency-frequency correlation function has a short time scale of around 110 fs and a longer time scale of about 1.15 ps. It was found that the short time scale originates from the underdamped motion of intact hydrogen bonds of MA pairs. However, the long time scale of the vibrational spectral diffusion of N-D modes is determined by the overall dynamics of hydrogen bonds as well as the dangling ND groups and the inertial rotation of the amine group of the molecule.
Collapse
Affiliation(s)
- Sohag Biswas
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy - 502285, Telangana, India.
| | | |
Collapse
|
10
|
Abstract
The diffusivity of ions in liquid solutions is known either to decrease with an increase in the ion size or to have a single maximum depending on the ion size. This article presents evidence for the appearance of multiple maxima and thus multiple ion sizes with enhanced diffusivity.
Collapse
Affiliation(s)
- Maksim A. Orekhov
- Moscow Institute of Physics and Technology (State University)
- Dolgoprudny
- Russia
- National Research University Higher School of Economics (NRU HSE)
- Moscow
| |
Collapse
|
11
|
Migliorati V, D’Angelo P. Unraveling the perturbation induced by Zn2+ and Hg2+ ions on the hydrogen bond patterns of liquid methanol. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.05.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
12
|
Kumar P, Kulkarni AD, Yashonath S. Influence of a Counterion on the Ion Atmosphere of an Anion: A Molecular Dynamics Study of LiX and CsX (X = F–, Cl–, I–) in Methanol. J Phys Chem B 2015; 119:10921-33. [DOI: 10.1021/acs.jpcb.5b00481] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Parveen Kumar
- Solid
State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Anant D. Kulkarni
- Centre
for Computational Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
| | - S. Yashonath
- Solid
State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
- Center
for Condensed Matter Theory, Indian Institute of Science, Bangalore 560012, India
| |
Collapse
|
13
|
Bogatko S, Cauët E, Geerlings P, De Proft F. On the coupling of solvent characteristics to the electronic structure of solute molecules. Phys Chem Chem Phys 2014; 16:3807-14. [PMID: 24435016 DOI: 10.1039/c3cp54944e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We present the results of a theoretical investigation focusing on the solvent structure surrounding the -1, 0 and +1 charged species of F, Cl, Br and I halogen atoms and F2, Cl2, Br2 and I2 di-halogen molecules in a methanol solvent and its influence on the electronic structure of the solute molecules. Our results show a large stabilizing effect arising from the solute-solvent interactions. Well-formed first solvation shells are observed for all species, the structure of which is strongly influenced by the charge of the solute species. Detailed analysis reveals that coordination number, CN, solvent orientation, θ, and solute-solvent distance, d, are important structural characteristics which are coupled to changes in the electronic structure of the solute. We propose that the fundamental chemistry of any solute species is generally regulated by these solvent degrees of freedom.
Collapse
Affiliation(s)
- Stuart Bogatko
- Eenheid Algemene Chemie, Vrije Universiteit Brussel (VUB), Faculteit Wetenschappen, Pleinlaan 2, 1050 Brussels, Belgium.
| | | | | | | |
Collapse
|
14
|
Smirnov PR. Comparative review of structural parameters of the nearest surrounding of monoatomic cations in water and methanol media. RUSS J GEN CHEM+ 2013. [DOI: 10.1134/s1070363213110017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
15
|
Kumar P, Varanasi SR, Yashonath S. Relation Between the Diffusivity, Viscosity, and Ionic Radius of LiCl in Water, Methanol, and Ethylene Glycol: A Molecular Dynamics Simulation. J Phys Chem B 2013; 117:8196-208. [DOI: 10.1021/jp4036919] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Parveen Kumar
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012 India
| | | | | |
Collapse
|
16
|
Antipova ML, Petrenko VE. Hydrogen bond lifetime for water in classic and quantum molecular dynamics. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2013. [DOI: 10.1134/s0036024413070030] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
17
|
Pressure effects on the dynamics of ions and solvent molecules in liquid methanol under ambient and cold conditions: Importance of solvent's H-bonding network. J Mol Liq 2013. [DOI: 10.1016/j.molliq.2013.01.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
18
|
PATTANAYAK SUBRATKUMAR, CHOWDHURI SNEHASIS. SIZE DEPENDENCE OF SOLVATION STRUCTURE AND DYNAMICS OF IONS IN LIQUID N-METHYLACETAMIDE: A MOLECULAR DYNAMICS SIMULATION STUDY. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2012. [DOI: 10.1142/s0219633612500241] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The solvation structure and dynamics of alkali metal (Li+, Na+, K+, Rb+, Cs+) and halide (F-, Cl-, Br-, I-) ions in liquid N -methylacetamide (NMA) are calculated at two different temperatures T = 313 K and 453 K, by using classical molecular dynamics simulations. We have also considered [Formula: see text] and some larger cations such as I +, Me 4 N +, and Et4N+ in this study to investigate the size dependence solvation structure and dynamics of ions in liquid NMA. With the increase of ion size, the self-diffusion coefficients of cations are found to increase and the maximum is observed at Me4N+ , whereas for halide ions the increase of diffusion coefficient with ion size continues up to I- and no maximum is observed. However, the relative increase of the diffusion coefficients of larger ion compared to those of Li+ and F+ are found to be significantly higher at low temperature. Results are very good in agreement with experimental observation.
Collapse
Affiliation(s)
| | - SNEHASIS CHOWDHURI
- School of Basic Sciences, Indian Institute of Technology, Bhubaneswar 751013, India
| |
Collapse
|
19
|
Chakraborty D, Chandra A. Voids and necks in liquid ammonia and their roles in diffusion of ions of varying size. J Comput Chem 2012; 33:843-52. [DOI: 10.1002/jcc.22910] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Revised: 10/30/2011] [Accepted: 11/20/2011] [Indexed: 11/05/2022]
|
20
|
Wibowo R, Aldous L, Jones SEW, Compton RG. The electrode potentials of the Group I alkali metals in the ionic liquid N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.04.063] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
21
|
Suresh SJ, Prabhu AL, Arora A. Influence of electric field on the hydrogen bond network of methanol. J Chem Phys 2007; 126:134502. [PMID: 17430042 DOI: 10.1063/1.2647105] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The understanding of the structure of hydrogen (H) bonding liquids in electric (E) fields is important in the context of several areas of research, such as electrochemistry, surface science, and thermodynamics of electrolyte solutions. We had earlier presented a general thermodynamic framework for this purpose, and had shown that the application of E field enhances H-bond interactions among water molecules. The present investigation with methanol suggests a different result-the H-bond structure, as indicated by the average number of H bonds per molecule, goes through a maxima with increasing field strength. This result is explained based on the symmetry in the location of the H-bonding sites in the two types of molecules.
Collapse
Affiliation(s)
- S J Suresh
- Unilever Research India, 64 Main Road, Whitefield, Bangalore 560066, India.
| | | | | |
Collapse
|
22
|
Faralli C, Pagliai M, Cardini G, Schettino V. Structure and Dynamics of Br- Ion in Liquid Methanol. J Phys Chem B 2006; 110:14923-8. [PMID: 16869605 DOI: 10.1021/jp061230o] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A Car-Parrinello molecular dynamics simulation has been performed on a solution of Br- in liquid methanol analyzing with particular attention charge transfer and polarization effects. The first solvation shell has been characterized in terms of H-bonds, and it has been found that the high polarization of the bromide gives rise to a stable solvent cage. The differences in the coordination number with the chloride can be ascribed to the ionic radius and to the stronger perturbations brought by the solvent to the bromide ion.
Collapse
Affiliation(s)
- Cristian Faralli
- Laboratorio di Spettroscopia Molecolare, Dipartimento di Chimica, Università di Firenze, Via della Lastruccia 3, 50019 Sesto Fiorentino, Firenze, Italia
| | | | | | | |
Collapse
|