1
|
Urikhinbam SS, Shagolsem LS. Size-Polydisperse Model Ionic Liquid in Bulk. J Phys Chem B 2023; 127:2739-2748. [PMID: 36920477 DOI: 10.1021/acs.jpcb.2c08315] [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
The static and the dynamic properties of a size-polydisperse model ionic liquid is studied using molecular dynamics simulations. Here, the size of the anions is derived from a Gaussian distribution while keeping cation size fixed, resulting in a system that closely corresponds to IL mixtures with a common cation. We systematically explore the behavior of thermodynamic transition temperatures, spatial ordering of ions, and the resulting screening behavior as a function of polydispersity index, δ. We observe a nonmonotonic dependence of transition temperatures on δ, and this nonmonotonic behavior is also reflected in other properties such as screening length. Furthermore, from the radial distribution function analysis it is found that, upon varying δ, the spatial ordering of cations is affected, while no such changes is seen for anion. On the other hand, the analysis of ion motion through mean-square displacement show that for all δ values considered both inertial and diffusive regimes are observed (as expected in the liquid state). However, in contrast to the neutral counterpart, the overall relaxation time of the polydisperse IL system increases (and hence decreasing diffusion coefficient) with increasing δ.
Collapse
Affiliation(s)
| | - Lenin S Shagolsem
- Department of Physics, National Institute of Technology Manipur, Imphal 795001, India
| |
Collapse
|
2
|
Golub B, Ondo D, Ludwig R, Paschek D. Why Do Liquids Mix? The Mixing of Protic Ionic Liquids Sharing the Same Cation Is Apparently Driven by Enthalpy, Not Entropy. J Phys Chem Lett 2022; 13:3556-3561. [PMID: 35420814 DOI: 10.1021/acs.jpclett.2c00634] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
We study hydrogen bond (HB) redistribution in mixtures of two protic ionic liquids (PILs) sharing the same cation: triethylammonium methanesulfonate ([TEA][OMs]) and triethylammonium trifluoromethanesulfonate ([TEA][OTf]). The mixtures exhibit large negative energies of mixing. Based on results obtained from atomic detail molecular dynamics (MD) simulations, we derive a lattice model, discriminating between HB and nonspecific intermolecular interactions. We demonstrate that due to the ordered structure of the PILs, mostly the HB interactions contribute to the mixing energy. This allows to us to connect the equilibrium of HBs to each of the two anion species with the corresponding excess energies and entropies. The entropy associated with HB redistribution is shown to be negative, and even overcompensating the positive entropy associated with a statistical distribution of the ions in the mixture. This is strongly suggesting that the mixing process is driven by enthalpy, not entropy.
Collapse
Affiliation(s)
- Benjamin Golub
- Physikalische und Theoretische Chemie, Institut für Chemie, Universität Rostock, Albert-Einstein-Straße 27, D-18059 Rostock, Germany
| | - Daniel Ondo
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5., 166 28 Prague 6, Czech Republic
| | - Ralf Ludwig
- Physikalische und Theoretische Chemie, Institut für Chemie, Universität Rostock, Albert-Einstein-Straße 27, D-18059 Rostock, Germany
- Leibniz-Institut für Katalyse, Albert-Einstein-Straße 29a, D-18059 Rostock, Germany
| | - Dietmar Paschek
- Physikalische und Theoretische Chemie, Institut für Chemie, Universität Rostock, Albert-Einstein-Straße 27, D-18059 Rostock, Germany
| |
Collapse
|
3
|
Golub B, Ondo D, Overbeck V, Ludwig R, Paschek D. Hydrogen Bond Redistribution Effects in Mixtures of Protic Ionic Liquids Sharing the Same Cation: Non-ideal Mixing with Large Negative Mixing Enthalpies. Phys Chem Chem Phys 2022; 24:14740-14750. [DOI: 10.1039/d2cp01209j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a joint experimental and theoretical study characterising the hydrogen bond (HB) redistribution in mixtures of two different protic ionic liquids (PILs) sharing the same cation: triethylammonium-methanesulfonate ([TEA][OMs]) and...
Collapse
|
4
|
Wang X, Huang Y, Li L, Huang L, Chen X, Yang Z. Molecular-level insights into composition-dependent structure, dynamics, and hydrogen bonds of binary ionic liquid mixture from molecular dynamics simulations. Chem Phys 2021. [DOI: 10.1016/j.chemphys.2020.111051] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
5
|
Puerto Galvis CE, Granados CC, Kouznetsov VV, Macías MA. Synthesis and X-ray crystallographic analysis of free base and hexafluorophosphate salts of 3,4-dihydroisoquinolines from the Bischler–Napieralski reaction. NEW J CHEM 2021. [DOI: 10.1039/d0nj05235c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Free base and hexafluorophosphate salts of 3,4-dihydroisoquinolines from the Bischler–Napieralski reaction: potential supramolecular modulation. Centrosymmetric/enantiomorphic crystals.
Collapse
Affiliation(s)
- Carlos E. Puerto Galvis
- Laboratorio de Química Orgánica y Biomolecular
- CMN
- Universidad Industrial de Santander
- Parque Tecnológico Guatiguará
- Piedecuesta 681011
| | - Cristian C. Granados
- Crystallography and Chemistry of Materials
- CrisQuimMat
- Department of Chemistry
- Universidad de los Andes
- Bogotá 111711
| | - Vladimir V. Kouznetsov
- Laboratorio de Química Orgánica y Biomolecular
- CMN
- Universidad Industrial de Santander
- Parque Tecnológico Guatiguará
- Piedecuesta 681011
| | - Mario A. Macías
- Crystallography and Chemistry of Materials
- CrisQuimMat
- Department of Chemistry
- Universidad de los Andes
- Bogotá 111711
| |
Collapse
|
6
|
Sappidi P, Bara JE, Turner CH. Molecular-level behavior of imidazolium-based ionic liquid mixtures. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2020.116073] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
7
|
Heydari Dokoohaki M, Zolghadr AR, Ghatee MH, Klein A. Aqueous solutions of binary ionic liquids: insight into structure, dynamics, and interface properties by molecular dynamics simulations and DFT methods. Phys Chem Chem Phys 2020; 22:27882-27895. [PMID: 33284294 DOI: 10.1039/d0cp04303f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The behavior of aqueous solutions of mixtures of ionic liquids (ILs) is of special interest because of their amphiphilic character, from both a fundamental and application viewpoint. In this work, we conducted molecular dynamics (MD) simulations and density functional theory (DFT) calculations to understand the effect of water on the intermolecular interactions in three IL binary mixtures [C4mim]/[Cl]/[BF4], [C4mim]/[Cl]/[PF6] and [C4mim]/[BF4]/[PF6] containing the well-characterized cation, 1-n-butyl-3-methylimidazolium [C4mim]+ and the anions chloride [Cl]-, tetrafluoroborate [BF4]-, and hexafluorophosphate [PF6]-. The perturbation of the structures in the binary IL mixture by water molecules was analyzed in the bulk and at the liquid/vacuum interface using distribution functions, hydrogen-bond statistics, and density profiles. Interactions between anions and cations change drastically when the IL mixtures are dissolved in water. In particular, anion-water interactions are stronger than anion-cation interactions. H-Bonds are the dominant interactions. They are prevalently electrostatic and strong for the two [Cl]-containing systems in both the water-free and the water-containing systems. The very hydrophobic [C4mim]/[BF4]/[PF6] system gains stability from dispersive interactions and consequently segregates water markedly when admixed. The most probable orientations of IL cations in the bulk and at the vicinity of the interface were examined using bivariate distribution calculations and show [PF6]- segregating to the surface in keeping with its highly hydrophobic nature. DFT calculated structures, energies, dipole moments, global hardness and solvation energies using model ion pairs [C4mim][X] or complexes [C4mim]2[X][Y], with [X/Y]- = [Cl]-, [BF4]-, or [PF6]- are completely consistent with the findings for the bulk.
Collapse
|
8
|
Kapoor U, Shah JK. Macroscopic Differentiators for Microscopic Structural Nonideality in Binary Ionic Liquid Mixtures. J Phys Chem B 2020; 124:7849-7856. [PMID: 32790368 DOI: 10.1021/acs.jpcb.0c03740] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Combining two ionic liquids to form a binary ionic liquid mixture is a simple yet effective strategy to not only expand the number of ionic liquids but also precisely control various physicochemical properties of resultant ionic liquid mixtures. From a fundamental thermodynamic point of view, it is not entirely clear whether such mixtures can be classified as ideal solutions. Given a large number of binary ionic liquid mixtures that emerge, the ability to predict the presence of nonideality in such mixtures a priori without the need for experimentation or molecular simulation-based calculations is immensely valuable for their rational design. In this research report, we demonstrate that the difference in the molar volumes (ΔV) of the pure ionic liquids and the difference in the hydrogen-bonding ability of anions (Δβ) are the primary determinants of nonideal behavior of binary ionic liquid mixtures containing a common cation and two anions. Our conclusion is derived from a comparison of microscopic structural properties expressed in terms of radial, spatial, and angular distributions for binary mixtures and those of the corresponding pure ionic liquids. Molecular dynamics simulations of 16 binary ionic liquid mixtures, containing a common cation 1-n-butyl-3-methylimidazolium [C4mim]+ and combinations of (less basic) fluorinated {trifluoromethylacetate [TFA]-, trifluoromethanesulfonate [TFS]-, bis(trifluoromethanesulfonyl)imide [NTf2]-, and tris (pentafluoroethyl) trifluorophosphate [eFAP]-} versus (more basic) nonfluorinated {chloride Cl-, acetate [OAC]-, methylsulfate [MeSO4]-, and dimethylphosphate [Me2PO4]-} anions, were conducted. The large number of binary ionic liquid mixtures examined here enabled us to span a broad range of ΔV and Δβ values. The results indicate that binary mixtures of two ionic liquids for which ΔV > 60 cm3/mol and Δβ > 0.4 are expected to be microscopically nonideal. On the other hand, ΔV < 60 cm3/mol and Δβ < 0.4 will lead to molecular structures that are not differentiated from those of their pure ionic liquid counterparts.
Collapse
Affiliation(s)
- Utkarsh Kapoor
- School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Jindal K Shah
- School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| |
Collapse
|
9
|
Banerjee A, Shah JK. Elucidating the effect of the ionic liquid type and alkyl chain length on the stability of ionic liquid-iron porphyrin complexes. J Chem Phys 2020; 153:034306. [PMID: 32716177 DOI: 10.1063/5.0007815] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The present study is motivated by the long-term objective of understanding how ionic liquids are biodegraded by cytochrome P450, which contains iron porphyrin (FeP) serving as the catalytic center. To this end, the current study is designed to elucidate the impact of types and conformations of ionic liquids on the binding energy with FeP, the key interactions that stabilize the ionic liquid-FeP complex, and how the electron uptake ability of FeP is altered in the presence of ionic liquids. Four classes of ionic liquids are considered: 1-alkyl-3-methylimidazolium, 1-alkyl-pyridinium, 1-alkylsulfonium, and N-methyl-N-alkylpyrrolidinium. The influence of linear alkyl chains of ethyl, butyl, hexyl, octyl, and decyl is examined on the favorable binding modes with FeP, considering two widely different conformations: tail up and tail down with respect to FeP. Electronic structure calculations are performed at the M06 level of theory with the 6-31G(d,p) basis set for C, H, and N atoms, while the Lanl2DZ basis set is employed for Fe. Donor-acceptor interactions contributing to the binding of ionic liquids to FeP are unraveled through the natural bond orbital analysis. The results from this study indicate that the binding energies are dependent not only on the class of ionic liquids but also on the conformations presented to FeP. The propensity of FeP to acquire an electron is significantly enhanced in the presence of ionic liquid cations, irrespective of the type and the alkyl chain length.
Collapse
Affiliation(s)
- Atiya Banerjee
- School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA
| | - Jindal K Shah
- School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA
| |
Collapse
|
10
|
Wang YL, Li B, Sarman S, Mocci F, Lu ZY, Yuan J, Laaksonen A, Fayer MD. Microstructural and Dynamical Heterogeneities in Ionic Liquids. Chem Rev 2020; 120:5798-5877. [PMID: 32292036 PMCID: PMC7349628 DOI: 10.1021/acs.chemrev.9b00693] [Citation(s) in RCA: 183] [Impact Index Per Article: 45.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Indexed: 12/11/2022]
Abstract
Ionic liquids (ILs) are a special category of molten salts solely composed of ions with varied molecular symmetry and charge delocalization. The versatility in combining varied cation-anion moieties and in functionalizing ions with different atoms and molecular groups contributes to their peculiar interactions ranging from weak isotropic associations to strong, specific, and anisotropic forces. A delicate interplay among intra- and intermolecular interactions facilitates the formation of heterogeneous microstructures and liquid morphologies, which further contributes to their striking dynamical properties. Microstructural and dynamical heterogeneities of ILs lead to their multifaceted properties described by an inherent designer feature, which makes ILs important candidates for novel solvents, electrolytes, and functional materials in academia and industrial applications. Due to a massive number of combinations of ion pairs with ion species having distinct molecular structures and IL mixtures containing varied molecular solvents, a comprehensive understanding of their hierarchical structural and dynamical quantities is of great significance for a rational selection of ILs with appropriate properties and thereafter advancing their macroscopic functionalities in applications. In this review, we comprehensively trace recent advances in understanding delicate interplay of strong and weak interactions that underpin their complex phase behaviors with a particular emphasis on understanding heterogeneous microstructures and dynamics of ILs in bulk liquids, in mixtures with cosolvents, and in interfacial regions.
Collapse
Affiliation(s)
- Yong-Lei Wang
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Bin Li
- School
of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, P. R. China
| | - Sten Sarman
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Francesca Mocci
- Department
of Chemical and Geological Sciences, University
of Cagliari, I-09042 Monserrato, Italy
| | - Zhong-Yuan Lu
- State
Key Laboratory of Supramolecular Structure and Materials, Institute
of Theoretical Chemistry, Jilin University, Changchun 130021, P. R. China
| | - Jiayin Yuan
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Aatto Laaksonen
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
- State
Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University, Nanjing 210009, P. R. China
- Centre of
Advanced Research in Bionanoconjugates and Biopolymers, Petru Poni Institute of Macromolecular Chemistry Aleea Grigore Ghica-Voda, 41A, 700487 Iasi, Romania
- Department
of Engineering Sciences and Mathematics, Division of Energy Science, Luleå University of Technology, SE-97187 Luleå, Sweden
| | - Michael D. Fayer
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
| |
Collapse
|
11
|
Di
Pietro ME, Castiglione F, Mele A. Anions as Dynamic Probes for Ionic Liquid Mixtures. J Phys Chem B 2020; 124:2879-2891. [PMID: 32186377 PMCID: PMC7997561 DOI: 10.1021/acs.jpcb.0c00026] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 02/14/2020] [Indexed: 11/28/2022]
Abstract
Ionic liquid (IL) mixtures have been proposed as a viable alternative to rationally fine-tune the physicochemical properties of ILs for a variety of applications. The understanding of the effects of mixing ILs on the properties of the mixtures is however only in the very early stages. Two series of ionic liquid mixtures, based on the 1-ethyl-3-methylimidazolium and 1-dodecyl-3-methylimidazolium cations, and having a common anion (tetrafluoroborate or bis(trifluoromethylsulfonyl)imide), have been prepared and deeply characterized via multiple NMR techniques. Diffusion and relaxation methods combined with 2D ion-ion correlation (nuclear Overhauser enhancement) experiments have been used for a better understanding of the interplay between dynamics and structure of IL mixtures. A crucial role of the anion in driving the mixture's behavior emerged, making them important "dynamic probes" for gaining information of the polar and nonpolar regions of ionic liquids and their mixtures.
Collapse
Affiliation(s)
- Maria Enrica Di
Pietro
- Department
of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy
| | - Franca Castiglione
- Department
of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy
| | - Andrea Mele
- Department
of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy
- Istituto
di Scienze e Tecnologie Chimiche (SCITEC-CNR), Via A. Corti 12, 20133 Milano, Italy
| |
Collapse
|
12
|
Fatima U, Riyazuddeen, Montes-Campos H, Varela LM. Experimental and MD simulation investigation on thermophysical properties of binary/ternary mixtures of 1-butyl-3-methylimidazolium trifluoromethanesulfonate with molecular solvents. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112481] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
13
|
Wang X, Fu F, Peng K, Yang Z, Hu N, Chen X, Li W. Understanding of structures, dynamics, and hydrogen bonds of imidazolium-based ionic liquid mixture from molecular dynamics simulation. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2019.110391] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
14
|
Banerjee A, Shah JK. Insight into conformationally-dependent binding of 1- n-alkyl-3-methylimidazolium cations to porphyrin molecules using quantum mechanical calculations. Phys Chem Chem Phys 2019; 21:10095-10104. [DOI: 10.1039/c9cp01538h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first step in the biodegradation of imidazolium-based ionic liquids involves the insertion of the –OH group into the alkyl side chain, and it is believed to be triggered by cytochrome P450. In this work, we investigate the effect of conformations on binding energies of ionic liquid cations to the catalytic center of P450.
Collapse
Affiliation(s)
- Atiya Banerjee
- School of Chemical Engineering
- Oklahoma State University
- Stillwater
- USA
| | - Jindal K. Shah
- School of Chemical Engineering
- Oklahoma State University
- Stillwater
- USA
| |
Collapse
|
15
|
Chakraborty M, Ahmed T, Dhale RS, Majhi D, Sarkar M. Understanding the Microscopic Behavior of Binary Mixtures of Ionic Liquids through Various Spectroscopic Techniques. J Phys Chem B 2018; 122:12114-12130. [DOI: 10.1021/acs.jpcb.8b09699] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Manjari Chakraborty
- School of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar 751005, India
| | - Tasnim Ahmed
- Department of Chemistry, University of Hyderabad, Hyderabad 500046, India
| | - Ranu Satish Dhale
- School of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar 751005, India
| | - Debashis Majhi
- School of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar 751005, India
| | - Moloy Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar 751005, India
| |
Collapse
|
16
|
Avula NVS, Mondal A, Balasubramanian S. Charge Environment and Hydrogen Bond Dynamics in Binary Ionic Liquid Mixtures: A Computational Study. J Phys Chem Lett 2018; 9:3511-3516. [PMID: 29883123 DOI: 10.1021/acs.jpclett.8b01481] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The extent of charge transfer between the cation and the anion in a room-temperature ionic liquid depends on the basicity of the anion. Ion charges determined in the condensed state via density functional theory calculations capture this effect rather well, and charges derived in such a manner have been employed in force field-based molecular dynamics simulations to quantitatively reproduce several physical properties of the liquids. However, the issue of transferability of cation charges in mixtures of ionic liquids, say with one type of cation and two different anion types needs to be addressed. Herein, we demonstrate that the cation charge in such a mixture varies linearly with anion composition, a result that ties in rather well with X-ray photoelectron spectroscopic experiments. The variation in cation charge with bulk anion composition is shown to be a result of changes in its coordination environment. Cations surrounded by a higher proportion of more basic anions possess lower charges than those surrounded by less basic anions. Time scales for the exchange of anion types for the occupation of hydrogen bonding sites around the cation have been determined and are seen to be constituted by three processes-breakage of existing hydrogen bond, diffusion to the hydrogen bonding site and displacement of the incumbent anion from its site in the cation coordination shell. These time scales explain the differences observed between infrared and NMR spectroscopic experiments in ionic liquid mixtures rather well.
Collapse
Affiliation(s)
- Nikhil V S Avula
- Chemistry and Physics of Materials Unit , Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore 560064 , India
| | - Anirban Mondal
- Chemistry and Physics of Materials Unit , Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore 560064 , India
| | - Sundaram Balasubramanian
- Chemistry and Physics of Materials Unit , Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore 560064 , India
| |
Collapse
|
17
|
Change of hydrogen bonding structure in ionic liquid mixtures by anion type. J Chem Phys 2018; 148:193827. [DOI: 10.1063/1.5010067] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
18
|
Brooks NJ, Castiglione F, Doherty CM, Dolan A, Hill AJ, Hunt PA, Matthews RP, Mauri M, Mele A, Simonutti R, Villar-Garcia IJ, Weber CC, Welton T. Linking the structures, free volumes, and properties of ionic liquid mixtures. Chem Sci 2017; 8:6359-6374. [PMID: 29619199 PMCID: PMC5859882 DOI: 10.1039/c7sc01407d] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 07/11/2017] [Indexed: 11/21/2022] Open
Abstract
The formation of ionic liquid (IL) mixtures has been proposed as an approach to rationally fine-tune the physicochemical properties of ILs for a variety of applications. However, the effects of forming such mixtures on the resultant properties of the liquids are only beginning to be understood. Towards a more complete understanding of both the thermodynamics of mixing ILs and the effect of mixing these liquids on their structures and physicochemical properties, the spatial arrangement and free volume of IL mixtures containing the common [C4C1im]+ cation and different anions have been systematically explored using small angle X-ray scattering (SAXS), positron annihilation lifetime spectroscopy (PALS) and 129Xe NMR techniques. Anion size has the greatest effect on the spatial arrangement of the ILs and their mixtures in terms of the size of the non-polar domains and inter-ion distances. It was found that differences in coulombic attraction between oppositely charged ions arising from the distribution of charge density amongst the atoms of the anion also significantly influences these inter-ion distances. PALS and 129Xe NMR results pertaining to the free volume of these mixtures were found to strongly correlate with each other despite the vastly different timescales of these techniques. Furthermore, the excess free volumes calculated from each of these measurements were in excellent agreement with the excess volumes of mixing measured for the IL mixtures investigated. The correspondence of these techniques indicates that the static and dynamic free volume of these liquid mixtures are strongly linked. Consequently, fluxional processes such as hydrogen bonding do not significantly contribute to the free volumes of these liquids compared to the spatial arrangement of ions arising from their size, shape and coulombic attraction. Given the relationship between free volume and transport properties such as viscosity and conductivity, these results provide a link between the structures of IL mixtures, the thermodynamics of mixing and their physicochemical properties.
Collapse
Affiliation(s)
- Nicholas J Brooks
- Department of Chemistry , Imperial College London , London , SW7 2AZ , UK .
| | - Franca Castiglione
- Department of Chemistry , Materials and Chemical Engineering "Giulio Natta" , Politecnico di Milano , Piazza L. da Vinci 32 , 20133 Milan , Italy
| | - Cara M Doherty
- CSIRO Manufacturing , Private Bag 10 , Clayton South , Victoria 3169 , Australia
| | - Andrew Dolan
- Department of Chemistry , Imperial College London , London , SW7 2AZ , UK .
| | - Anita J Hill
- CSIRO Manufacturing , Private Bag 10 , Clayton South , Victoria 3169 , Australia
| | - Patricia A Hunt
- Department of Chemistry , Imperial College London , London , SW7 2AZ , UK .
| | - Richard P Matthews
- Department of Chemistry , Imperial College London , London , SW7 2AZ , UK .
| | - Michele Mauri
- Dipartimento di Scienza dei Materiali , Università of Milano-Bicocca , via Cozzi 55 , 20125 Milano , Italy
| | - Andrea Mele
- Department of Chemistry , Materials and Chemical Engineering "Giulio Natta" , Politecnico di Milano , Piazza L. da Vinci 32 , 20133 Milan , Italy
| | - Roberto Simonutti
- Dipartimento di Scienza dei Materiali , Università of Milano-Bicocca , via Cozzi 55 , 20125 Milano , Italy
| | - Ignacio J Villar-Garcia
- Department of Chemistry , Imperial College London , London , SW7 2AZ , UK . .,Photoactivated Processes Unit , IMDEA Energy Institute , Móstoles Technology Park, Avenida Ramón de la Sagra, 3 , 28935 Móstole , Madrid , Spain
| | - Cameron C Weber
- Department of Chemistry , Imperial College London , London , SW7 2AZ , UK . .,School of Science , Auckland University of Technology , Auckland 1010 , New Zealand
| | - Tom Welton
- Department of Chemistry , Imperial College London , London , SW7 2AZ , UK .
| |
Collapse
|
19
|
Rao SS, Bartolotti LJ, Gejji SP. Noncovalent interactions underlying binary mixtures of amino acid based ionic liquids: insights from theory. Phys Chem Chem Phys 2017; 19:29561-29582. [DOI: 10.1039/c7cp04323f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mixtures of ionic liquids formed by blending a common 1-methyl-3-butylimidazolium [Bmim] cation with the dicarboxylic amino acid anions viz., aspartic acid [Asp], asparagine [Asn], glutamic acid [Glu], and glutamine [Gln], have been investigated by employing dispersion corrected density functional theory.
Collapse
Affiliation(s)
- Soniya S. Rao
- Department of Chemistry
- Savitribai Phule Pune University
- Pune
- India
| | | | | |
Collapse
|
20
|
Wu Y, Wang X, Liu Q, Ma X, Fang D, Jiang X, Guan W. Dynamic phase change and local structures in IL-containing mixtures: classical MD simulations and experiments. Phys Chem Chem Phys 2017; 19:3028-3038. [DOI: 10.1039/c6cp06300d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mechanism of dynamic phase transition and the formation of DSILs were discussed for [Bmim][PF6]/[Bmim][BF4]/H2O mixtures.
Collapse
Affiliation(s)
- Yang Wu
- College of Chemistry
- Liaoning University
- Shenyang 110036
- China
| | - Xia Wang
- College of Chemistry
- Liaoning University
- Shenyang 110036
- China
| | - Qiaozhen Liu
- College of Chemistry
- Liaoning University
- Shenyang 110036
- China
| | - Xiaoxue Ma
- College of Chemistry
- Liaoning University
- Shenyang 110036
- China
- Beijing National Laboratory for Molecular Sciences
| | - Dawei Fang
- College of Chemistry
- Liaoning University
- Shenyang 110036
- China
| | - Xuefei Jiang
- College of Chemistry
- Liaoning University
- Shenyang 110036
- China
| | - Wei Guan
- College of Chemistry
- Liaoning University
- Shenyang 110036
- China
| |
Collapse
|
21
|
Kapoor U, Shah JK. Preferential Ionic Interactions and Microscopic Structural Changes Drive Nonideality in Binary Ionic Liquid Mixtures as Revealed from Molecular Simulations. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.6b03314] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Utkarsh Kapoor
- School of Chemical
Engineering, Oklahoma State University, Stillwater, Oklahoma 74078 United States
| | - Jindal K. Shah
- School of Chemical
Engineering, Oklahoma State University, Stillwater, Oklahoma 74078 United States
| |
Collapse
|
22
|
Lepre LF, Szala-Bilnik J, Padua AAH, Traïkia M, Ando RA, Costa Gomes MF. Tailoring the properties of acetate-based ionic liquids using the tricyanomethanide anion. Phys Chem Chem Phys 2016; 18:23285-95. [DOI: 10.1039/c6cp04651g] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The properties of the mixtures [C4C1Im][OAc](1−x)[C(CN)3]x are explained by a rearrangement of the hydrogen-bond network favouring the interaction of the acetate anion with the C2 position of the cation.
Collapse
Affiliation(s)
- L. F. Lepre
- Laboratório de Espectroscopia Molecular
- Instituto de Química
- Departamento de Química Fundamental
- Universidade de São Paulo
- São Paulo 05513-970
| | - J. Szala-Bilnik
- Institut de Chimie de Clermont-Ferrand
- CNRS and Université Blaise Pascal
- Aubière Cedex F-63171
- France
| | - A. A. H. Padua
- Institut de Chimie de Clermont-Ferrand
- CNRS and Université Blaise Pascal
- Aubière Cedex F-63171
- France
| | - M. Traïkia
- Institut de Chimie de Clermont-Ferrand
- CNRS and Université Blaise Pascal
- Aubière Cedex F-63171
- France
| | - R. A. Ando
- Laboratório de Espectroscopia Molecular
- Instituto de Química
- Departamento de Química Fundamental
- Universidade de São Paulo
- São Paulo 05513-970
| | - M. F. Costa Gomes
- Institut de Chimie de Clermont-Ferrand
- CNRS and Université Blaise Pascal
- Aubière Cedex F-63171
- France
| |
Collapse
|
23
|
Matthews RP, Villar-Garcia IJ, Weber CC, Griffith J, Cameron F, Hallett JP, Hunt PA, Welton T. A structural investigation of ionic liquid mixtures. Phys Chem Chem Phys 2016; 18:8608-24. [DOI: 10.1039/c6cp00156d] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The role of hydrogen bonding, π+–π+ stacking and anion–π+ interactions on the structure of ionic liquid mixtures has been elucidated through a combined theoretical and experimental approach.
Collapse
Affiliation(s)
| | | | | | | | - Fiona Cameron
- Department of Chemistry
- Imperial College London
- London
- UK
| | - Jason P. Hallett
- Department of Chemistry
- Imperial College London
- London
- UK
- Department of Chemical Engineering
| | | | - Tom Welton
- Department of Chemistry
- Imperial College London
- London
- UK
| |
Collapse
|
24
|
Affiliation(s)
- Robert Hayes
- Discipline
of Chemistry, The University of Newcastle, NSW 2308, Callaghan, Australia
| | - Gregory G. Warr
- School
of Chemistry, The University of Sydney, NSW 2006, Sydney, Australia
| | - Rob Atkin
- Discipline
of Chemistry, The University of Newcastle, NSW 2308, Callaghan, Australia
| |
Collapse
|
25
|
Mondal A, Balasubramanian S. A Refined All-Atom Potential for Imidazolium-Based Room Temperature Ionic Liquids: Acetate, Dicyanamide, and Thiocyanate Anions. J Phys Chem B 2015; 119:11041-51. [DOI: 10.1021/acs.jpcb.5b02272] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anirban Mondal
- Chemistry and Physics of
Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560 064, India
| | - Sundaram Balasubramanian
- Chemistry and Physics of
Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560 064, India
| |
Collapse
|
26
|
Zahn S, Stark A. Order in the chaos: the secret of the large negative entropy of dissolving 1-alkyl-3-methylimidazolium chloride in trihexyltetradecylphosphonium chloride. Phys Chem Chem Phys 2015; 17:4034-7. [DOI: 10.1039/c4cp05074f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A large symmetric ion cluster cage is formed if 1-alkyl-3-methylimidazolium chloride ionic liquids with short alkyl chains are added to trihexyltetradecylphosphonium chloride which results in a large negative entropy of dissolution and an unexpected ion dynamics.
Collapse
Affiliation(s)
- Stefan Zahn
- Wilhelm Ostwald Institut für Physikalische und Theoretische Chemie
- Universität Leipzig
- 04103 Leipzig
- Germany
| | - Annegret Stark
- Eduard-Zintl Institut for Inorganic and Physical Chemistry
- Technical University Darmstadt
- 64287 Darmstadt
- Germany
| |
Collapse
|
27
|
Palchowdhury S, Bhargava BL. Segregation of ions at the interface: molecular dynamics studies of the bulk and liquid–vapor interface structure of equimolar binary mixtures of ionic liquids. Phys Chem Chem Phys 2015; 17:19919-28. [DOI: 10.1039/c5cp02932e] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Ions in an equimolar binary mixture of [emim][TfO] and [omim][TfO] segregate at the liquid–vapor interface to form a hydrophobic surface composed of octyl chains.
Collapse
Affiliation(s)
- Sourav Palchowdhury
- School of Chemical Sciences
- National Institute of Science Education & Research
- Bhubaneswar – 751005
- India
| | - B. L. Bhargava
- School of Chemical Sciences
- National Institute of Science Education & Research
- Bhubaneswar – 751005
- India
| |
Collapse
|
28
|
Keaveney ST, Harper JB, Croft AK. Computational approaches to understanding reaction outcomes of organic processes in ionic liquids. RSC Adv 2015. [DOI: 10.1039/c4ra14676j] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The utility of using a combined experimental and computational approach for understanding ionic liquid media, and their effect on reaction outcome, is highlighted through a number of case studies.
Collapse
Affiliation(s)
| | - Jason B. Harper
- School of Chemistry
- University of New South Wales
- Sydney
- Australia
| | - Anna K. Croft
- Department of Chemical and Environmental Engineering
- University of Nottingham
- University Park
- Nottingham
- UK
| |
Collapse
|
29
|
Abstract
Anion exchange in ionic liquid mixtures measured by IR and NMR spectroscopy.
Collapse
Affiliation(s)
- Seoncheol Cha
- Department of Physics
- Research Institute for Basic Science
- Sogang University
- Republic of Korea
| | - Doseok Kim
- Department of Physics
- Research Institute for Basic Science
- Sogang University
- Republic of Korea
| |
Collapse
|
30
|
dos Santos DJ, Cordeiro MND. Effect of replacing [NTf2] by [PF6] anion on the [BMIm][NTf2] ionic liquid confined by gold. MOLECULAR SIMULATION 2014. [DOI: 10.1080/08927022.2014.986122] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
31
|
Mondal A, Balasubramanian S. Quantitative prediction of physical properties of imidazolium based room temperature ionic liquids through determination of condensed phase site charges: a refined force field. J Phys Chem B 2014; 118:3409-22. [PMID: 24605817 DOI: 10.1021/jp500296x] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Quantitative prediction of physical properties of room temperature ionic liquids through nonpolarizable force field based molecular dynamics simulations is a challenging task. The challenge lies in the fact that mean ion charges in the condensed phase can be less than unity due to polarization and charge transfer effects whose magnitude cannot be fully captured through quantum chemical calculations conducted in the gas phase. The present work employed the density-derived electrostatic and chemical (DDEC/c3) charge partitioning method to calculate site charges of ions using electronic charge densities obtained from periodic density functional theory (DFT) calculations of their crystalline phases. The total ion charges obtained thus range between -0.6e for chloride and -0.8e for the PF6 ion. The mean value of the ion charges obtained from DFT calculations of an ionic liquid closely matches that obtained from the corresponding crystal thus confirming the suitability of using crystal site charges in simulations of liquids. These partial charges were deployed within the well-established force field developed by Lopes et al., and consequently, parameters of its nonbonded and torsional interactions were refined to ensure that they reproduced quantum potential energy scans for ion pairs in the gas phase. The refined force field was employed in simulations of seven ionic liquids with six different anions. Nearly quantitative agreement with experimental measurements was obtained for the density, surface tension, enthalpy of vaporization, and ion diffusion coefficients.
Collapse
Affiliation(s)
- Anirban Mondal
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore 560 064, India
| | | |
Collapse
|