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Koyakkat M, Ishida T, Fujita K, Shirota H. Low-Frequency Spectra of Hydrated Ionic Liquids with Kosmotropic and Chaotropic Anions. J Phys Chem B 2024; 128:4171-4182. [PMID: 38640467 DOI: 10.1021/acs.jpcb.4c01255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/21/2024]
Abstract
In this study, we investigated the water concentration dependence of the intermolecular vibrations of two hydrated ionic liquids (ILs), cholinium dihydrogen phosphate ([ch][dhp]) and cholinium bromide ([ch]Br), using femtosecond Raman-induced Kerr effect spectroscopy (fs-RIKES). The anions of the former and latter hydrated ILs are kosmotropic and chaotropic, respectively. We found that the spectral peak of ∼50 cm-1 shifted to the low-frequency side in hydrated [ch][dhp], indicating the weakening of its intermolecular interactions. In contrast, no change in the peak frequency of the low-frequency band at ∼50 cm-1 was observed with increasing water concentration in hydrated [ch]Br. The vibrational density of states (VDOS) spectra generated from molecular dynamics (MD) simulations were in qualitative agreement with the experimental results. Decomposition analysis of the VDOS spectra for each component revealed that the red shift of the low-frequency band in the hydrated [ch][dhp] upon water addition was essentially due to the contributions of anions and water rather than that of the cholinium cation. We also found from the low-frequency spectra of the two hydrated ILs that they differed in the concentration dependence of the 180 cm-1 band, which is assigned as a hindered translational motion of water molecules combined to form O···O stretching motions. From the relationship between the peak frequency of the low-frequency band and the bulk parameter, which is the square root of the surface tension divided by the density, we found that the peak frequency in the hydrated IL with kosmotropic [dhp]- depends on the bulk parameter, similar to the case for an aqueous solution of the typical deep eutectic solvent reline. However, the peak frequency of the hydrated IL with chaotropic Br- is constant with the bulk parameter.
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Affiliation(s)
- Maharoof Koyakkat
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Tateki Ishida
- Institute for Molecular Science and Research Center for Computational Science, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
| | - Kyoko Fujita
- Department of Pathophysiology, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Hideaki Shirota
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
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2
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Mahapatra A, Samantara AK, Barik S, Sahoo MK, Behera JN, Sarkar M. Insight into the structure and transport properties of pyrrolidinium-based geminal dicationic-organic ionic crystals: inravelling the role of alkyl-chain length. SOFT MATTER 2023; 19:3510-3518. [PMID: 37145490 DOI: 10.1039/d3sm00040k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The present study has been undertaken with an aim to design and develop safer and more efficient all solid-state electrolytes, so that the issues associated with the use of conventional room temperature ionic liquid-based electrolytes can be tackled. To fulfil this objective, a series of geminal di-cationic Organic Ionic Crystals (OICs), based on C3-, C6-, C8- and C9-alkylbridged bis-(methylpyrrolidinium)bromide are synthesized, and the structural features, thermal properties and phase behaviours of these as synthesized OICs have been investigated. Additionally, a number of electro-analytical techniques have been employed to assess their suitability as an efficient electrolyte composite (OIC:I2:TBAI) for all solid-state dye sensitised solar cells (DSSCs). The structural analysis has revealed that along with excellent thermal stability and well-defined surface morphology, all thsese OICs exhibit a well-ordered three-dimensional network of cations and anions that can serve as a conducting channel for the diffusion of iodide ions. Electrochemical investigations have shown that OICs with an intermediate length of alkyl bridge (C6- and C8-alkyl bridged) show better electrolytic performance than those that are based on OICs with a relatively shorter (C3-) or longer (C9-) alkyl-bridge chain. A careful analysis of the above data has essentially demonstrated that the length of the alkyl bridge chain plays a significant role in determining the structural organisation, morphology and eventually the ionic conductivity of OICs. Overall, the comprehensive knowledge on OICs that has been extracted from the current study is expected to be helpful to explore further new types of OIC-based all solid-state electrolytes with improved electrolytic performance for targeted applications.
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Affiliation(s)
- Amita Mahapatra
- School of Chemical Sciences, National Institute of Science Education and Research (NISER) Jatani, Khurda, Bhubaneswar 752050, Odisha, India.
- An OCC of Homi Bhabha National Institute (HBNI), Mumbai 400094, India
- Centre for Interdisciplinary Sciences (CIS), NISER, Jatni, Khurda, Bhubaneswar 752050, Odisha, India
| | - Aneeya K Samantara
- School of Chemical Sciences, National Institute of Science Education and Research (NISER) Jatani, Khurda, Bhubaneswar 752050, Odisha, India.
- An OCC of Homi Bhabha National Institute (HBNI), Mumbai 400094, India
- Centre for Interdisciplinary Sciences (CIS), NISER, Jatni, Khurda, Bhubaneswar 752050, Odisha, India
| | - Sahadev Barik
- School of Chemical Sciences, National Institute of Science Education and Research (NISER) Jatani, Khurda, Bhubaneswar 752050, Odisha, India.
- An OCC of Homi Bhabha National Institute (HBNI), Mumbai 400094, India
- Centre for Interdisciplinary Sciences (CIS), NISER, Jatni, Khurda, Bhubaneswar 752050, Odisha, India
| | - Malaya K Sahoo
- School of Chemical Sciences, National Institute of Science Education and Research (NISER) Jatani, Khurda, Bhubaneswar 752050, Odisha, India.
- An OCC of Homi Bhabha National Institute (HBNI), Mumbai 400094, India
- Centre for Interdisciplinary Sciences (CIS), NISER, Jatni, Khurda, Bhubaneswar 752050, Odisha, India
| | - J N Behera
- School of Chemical Sciences, National Institute of Science Education and Research (NISER) Jatani, Khurda, Bhubaneswar 752050, Odisha, India.
- An OCC of Homi Bhabha National Institute (HBNI), Mumbai 400094, India
- Centre for Interdisciplinary Sciences (CIS), NISER, Jatni, Khurda, Bhubaneswar 752050, Odisha, India
| | - Moloy Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER) Jatani, Khurda, Bhubaneswar 752050, Odisha, India.
- An OCC of Homi Bhabha National Institute (HBNI), Mumbai 400094, India
- Centre for Interdisciplinary Sciences (CIS), NISER, Jatni, Khurda, Bhubaneswar 752050, Odisha, India
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Shirota H, Rajbangshi J, Koyakkat M, Baksi A, Cao M, Biswas R. Low-frequency spectra of reline and its mixtures with water: A comparative study based on femtosecond Raman-induced Kerr effect spectroscopy and molecular dynamics simulations. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2022.114504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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4
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Ando M, Ohta K, Ishida T, Koido R, Shirota H. Physical Properties and Low-Frequency Polarizability Anisotropy and Dipole Responses of Phosphonium Bis(fluorosulfonyl)amide Ionic Liquids with Pentyl, Ethoxyethyl, or 2-(Ethylthio)ethyl Group. J Phys Chem B 2023; 127:542-556. [PMID: 36602430 DOI: 10.1021/acs.jpcb.2c07466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
This study compared the physical properties, e.g., glass transition temperature, melting point, viscosity, density, surface tension, and electrical conductivity, and the low-frequency spectra under 200 cm-1 of three synthesized ionic liquids (ILs), triethylpentylphosphonium bis(fluorosulfonyl)amide ([P2225][NF2]), ethoxyethyltriethylphosphonium bis(fluorosulfonyl)amide ([P222(2O2)][NF2]), and triethyl[2-(ethylthio)ethyl]phosphonium bis(fluorosulfonyl)amide ([P222(2S2)][NF2]), at various temperatures using femtosecond Raman-induced Kerr effect spectroscopy (fs-RIKES) and terahertz time-domain spectroscopy (THz-TDS). The [P222(2S2)][NF2] had the highest viscosity and glass transition temperature, whereas the [P222(2O2)][NF2] had the lowest. Among the three ILs, the [P222(2S2)][NF2] had the highest density and surface tension, and the [P222(2O2)][NF2] had the highest electrical conductivity. The RIKES and THz-TDS spectral line shapes for the three ILs varied significantly. For the [P2225][NF2], molecular dynamics simulations successfully reproduced the line shapes of the experimental spectra and indicated that the RIKES spectrum was mainly due to the cation and cross-term and their rotational motions, whereas the THz-TDS spectrum was mainly due to the anion and its translational motion. This shows that it is desirable to utilize both fs-RIKES and THz-TDS methods to reveal molecular motions at the low-frequency domain. The [P222(2S2)][NF2] had higher frequency peaks and broader bands in the low-frequency spectra via fs-RIKES and THz-TDS than those for the [P2225][NF2] and [P222(2O2)][NF2].
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Affiliation(s)
- Masatoshi Ando
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Kaoru Ohta
- Molecular Photoscience Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| | - Tateki Ishida
- Department of Theoretical and Computational Molecular Science, Institute for Molecular Science and Research Center for Computational Science, 38 Nishigonaka, Myodaiji, Okazaki 444-8585, Japan
| | - Ryohei Koido
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Hideaki Shirota
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
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Zafar A, Imtiaz‐ud‐Din, Palgrave RG, Muhammad H, Yousuf S, Evans T. Physico-Chemical Properties of Magnetic Dicationic Ionic Liquids with Tetrahaloferrate Anions. ChemistryOpen 2023; 12:e202200229. [PMID: 36599708 PMCID: PMC9812754 DOI: 10.1002/open.202200229] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Revised: 11/25/2022] [Indexed: 01/06/2023] Open
Abstract
A series of imidazolium-based symmetrical and asymmetrical dicationic ionic liquids (DcILs) with alkyl spacers of different length and with [FeCl3 Br]- as counter ion have been synthesized. The synthesized DcILs are characterized by using FTIR and Raman spectroscopy as well as mass spectrometry, along with single-crystal XRD analysis. Physicochemical properties such as solubility, thermal stability and magnetic susceptibility are also measured. These compounds show low melting points, good solubility in water and organic solvents, thermal stability, and paramagnetism. The products of molar susceptibility and temperature (χmol ⋅T) for the synthesized DcILs have been found between 4.05 to 4.79 emu mol-1 K Oe-1 and effective magnetic moment values have also been determined to be compared to that expected from the spin-only approximation.
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Affiliation(s)
- Anham Zafar
- Chemistry DepartmentUniversity College London20 Gordon StreetLondonWC1E 0AJUK
- Department of ChemistryQuaid-i-Azam UniversityIslamabad453208Pakistan
| | - Imtiaz‐ud‐Din
- Department of ChemistryQuaid-i-Azam UniversityIslamabad453208Pakistan
| | - Robert G. Palgrave
- Chemistry DepartmentUniversity College London20 Gordon StreetLondonWC1E 0AJUK
| | - Haji Muhammad
- Department of ChemistryFederal Urdu University of Arts, Sciences and TechnologyKarachi75300Pakistan
| | - Sammer Yousuf
- H.E.J. Research Institute of ChemistryInternational Center for Chemical and Biological SciencesUniversity of KarachiKarachi75270Pakistan
| | - Tim Evans
- Chemistry DepartmentUniversity College London20 Gordon StreetLondonWC1E 0AJUK
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6
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Biswas A, Mallik BS. Molecular Simulation-Guided Spectroscopy of Imidazolium-Based Ionic Liquids and Effects of Methylation on Ion-Cage and -Pair Dynamics. J Phys Chem B 2022; 126:8838-8850. [PMID: 36264223 DOI: 10.1021/acs.jpcb.2c04901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Classical molecular dynamics simulations were performed to assess an atomistic interpretation of the ion-probe structural interactions in two typical ionic liquids (ILs), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [BMIm][NTf2] and 1-butyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide [BDimIm][NTf2] through computational ultrafast spectroscopy. The nitrile stretching vibrations of the thiocyanate anion, [SCN]-, serve as the local mode of the ultrafast system dynamics within the imidazolium-based ionic liquid environment. The wavelet transform of classical trajectories determines the time-varying fluctuating frequencies and the stretch spectral signatures of SCN- in the normalized distribution. However, computational modeling of the two-dimensional (2D) spectra from the wavelet-derived vibrational frequencies yields time evolution of the local molecular structure along with the varied time-dependent dynamics of the spectral diffusion process. We calculated the frequency-frequency correlation functions (FFCFs), time correlations associated with the ion-pair and -cage dynamics, and mean square displacements as a function of time, depicting diffusive dynamics. The calculated results based on the pair correlation functions and the distribution of atomic density suggest that the hydrogen and methylated carbon at the two-position of the imidazolium ring of [BMIm] and [BDimIm] cations, respectively, strongly interact with the probe through the N of the thiocyanate anion rather than the S atom. The center-of-mass center-of-mass (COM-COM) cation-probe radial distribution functions (RDFs) in conjunction with the site-specific structural analysis further reveal well-structured interactions of the thiocyanate ion and [BMIm]+ cation rather than the [BDimIm] cation. In contrast, the anion-probe COM-COM RDFs depict weak interactive associations within the vibrational probe [SCN]- and [NTf2]- ions. Methylation at the two-position of the imidazolium ring predicts slower structural reorganization and breaking and reformation dynamics of the ion pairs and cages within the ionic liquid framework.
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Affiliation(s)
- Aritri Biswas
- Department of Chemistry, Indian Institute of Technology Hyderabad, Sangareddy502285, Telangana, India
| | - Bhabani S Mallik
- Department of Chemistry, Indian Institute of Technology Hyderabad, Sangareddy502285, Telangana, India
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7
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Mahapatra A, Chakraborty M, Barik S, Sarkar M. Comparison between pyrrolidinium-based and imidazolium-based dicationic ionic liquids: intermolecular interaction, structural organization, and solute dynamics. Phys Chem Chem Phys 2021; 23:21029-21041. [PMID: 34522923 DOI: 10.1039/d1cp02790e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With an aim to understand the difference in the behaviour of imidazolium and pyrrolidinium-based dicationic ionic liquids (DILs) in terms of the intermolecular interactions, microscopic-structure and dynamics, two DILs, the imidazolium-based 1,9-bis(3-methylimidazolium-1-yl)nonane bis(trifluoromethanesulfonyl)imide and the pyrrolidinium-based 1,9-bis(1-methylpyrrolidinium-1-yl)nonane bis(trifluoromethanesulfonyl)imide, have been synthesized and subsequently investigated by exploiting combined steady sate and time resolved fluorescence, electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) spectroscopic techniques. Data obtained for DILs have also been compared with their corresponding mono-cationic counterpart (MILs) to evaluate and understand the distinctive characteristics of the DILs in contrast with the corresponding MILs. Steady state emission and EPR data have revealed that the pyrrolidinium-based DIL is slightly less polar than the imidazolium-based DIL. Temperature-dependent fluorescence anisotropy decay of two probes, perylene and MPTS (8-methoxypyrene-1,3,6-trisulfonate), has been measured in DILs as well as in MILs. Solute-solvent coupling constants obtained from the experimentally measured rotational correlation times with the aid of Stokes-Einstein-Debye hydrodynamic theory have indicated appreciable differences in the dynamics of both the solutes on going from MILs to DILs. More interestingly, the outcome of the NMR study has suggested that the alkyl spacer chain in the imidazolium-based DIL exists in the folded form, but the pyrrolidinium-based DIL remains in the straight chain conformation. Inherently, the outcomes of all of these studies have depicted that the microscopic structural organisations in imidazolium and pyrrolidinium-based DILs are different from each other as well as from their respective mono-cationic counterparts.
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Affiliation(s)
- Amita Mahapatra
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, P.O. Jatni, Khurda, 752050, Bhubaneswar, Odisha, India.
| | - Manjari Chakraborty
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, P.O. Jatni, Khurda, 752050, Bhubaneswar, Odisha, India.
| | - Sahadev Barik
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, P.O. Jatni, Khurda, 752050, Bhubaneswar, Odisha, India.
| | - Moloy Sarkar
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, P.O. Jatni, Khurda, 752050, Bhubaneswar, Odisha, India.
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8
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Torkzadeh M, Moosavi M. Heterogeneity in microstructures and dynamics of dicationic ionic liquids with symmetric and asymmetric cations. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115632] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Shirota H, Ando M, Kakinuma S, Takahashi K. Ultrafast Dynamics in Nonaromatic Cation Based Ionic Liquids: A Femtosecond Raman-Induced Kerr Effect Spectroscopic Study. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20200198] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hideaki Shirota
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Masatoshi Ando
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Shohei Kakinuma
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Kotaro Takahashi
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
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10
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Ando M, Kawano M, Tashiro A, Takamuku T, Shirota H. Low-Frequency Spectra of 1-Methyl-3-octylimidazolium Tetrafluoroborate Mixtures with Methanol, Acetonitrile, and Dimethyl Sulfoxide: A Combined Study of Femtosecond Raman-Induced Kerr Effect Spectroscopy and Molecular Dynamics Simulations. J Phys Chem B 2020; 124:7857-7871. [DOI: 10.1021/acs.jpcb.0c04870] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masatoshi Ando
- Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Masahiro Kawano
- Department of Chemistry and Applied Chemistry, Graduate School of Science and Engineering, Saga University, Honjo-machi, Saga 840-8502, Japan
| | - Atsuya Tashiro
- Department of Chemistry and Applied Chemistry, Graduate School of Science and Engineering, Saga University, Honjo-machi, Saga 840-8502, Japan
| | - Toshiyuki Takamuku
- Faculty of Science and Engineering, Saga University, Honjo-machi, Saga 840-8502, Japan
| | - Hideaki Shirota
- Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
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11
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Reddy TDN, Mallik BS. Connecting Correlated and Uncorrelated Transport to Dynamics of Ionic Interactions in Cyclic Ammonium-Based Ionic Liquids. J Phys Chem B 2020; 124:6813-6824. [DOI: 10.1021/acs.jpcb.0c00577] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Th. Dhileep N. Reddy
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi-502285, Sangareddy, Telangana, India
| | - Bhabani S. Mallik
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi-502285, Sangareddy, Telangana, India
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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: 192] [Impact Index Per Article: 48.0] [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.
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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
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Verma PL, Gejji SP. Electronic structure, vibrational spectra and 1H NMR chemical shifts of the ion pair composites within imidazolium functionalized geminal dicationic ionic liquids from density functional theory. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.127112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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14
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Electronic structure and spectral characteristics of alkyl substituted imidazolium based dication-X2 (X = Br, BF4, PF6 and CF3SO3) complexes from theory. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111548] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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15
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Water-mediated weakening of inter-ionic interactions in aqueous mixtures of ionic liquid: An investigation combining quantum chemical calculations and molecular dynamics simulations. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2019.04.027] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Kakinuma S, Shirota H. Femtosecond Raman-Induced Kerr Effect Study of Temperature-Dependent Intermolecular Dynamics in Pyrrolidinium-Based Ionic Liquids: Effects of Anion Species. J Phys Chem B 2019; 123:1307-1323. [DOI: 10.1021/acs.jpcb.8b10269] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Javed F, Ullah F, Zakaria MR, Akil HM. An approach to classification and hi-tech applications of room-temperature ionic liquids (RTILs): A review. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.09.005] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Gurung E, Meng D, Xue L, Tamas G, Lynden-Bell RM, Quitevis EL. Optical Kerr effect spectroscopy of CS 2 in monocationic and dicationic ionic liquids: insights into the intermolecular interactions in ionic liquids. Phys Chem Chem Phys 2018; 20:26558-26569. [PMID: 30306995 DOI: 10.1039/c8cp04503h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A comparative study of the intermolecular dynamics of CS2 in monocationic and dicationic ionic liquids (ILs) was performed using optical heterodyne-detected Raman-induced Kerr effect spectroscopy (OHD-RIKES). The reduced spectral densities (RSDs) of mixtures of CS2 in 1-alkyl-3-methylimidazolium bis[(trifluoromethane)sulfonyl]amide ([CnC1im][NTf2] for n = 3-5) and 1,2n-bis(3-methylimidazolium-1-yl) alkane bis[(trifluoromethane)sulfonyl]amide ([(C1im)2C2n][NTf2]2 for n = 3-5) were investigated as a function of concentration at 295 K. An additivity model was used to obtain the CS2 contribution to the RSD of a mixture in the 0-200 cm-1 region. One of the aims of this study is to show how CS2 can be used as a probe of intermolecular/interionic interactions in ILs. The concentrations were chosen such that the CS2-to-imidazolium ring mole fraction of a mixture with [(C1im)2C2n][NTf2]2 (DIL(2n)) is the same as that of a mixture with [CnC1im][NTf2] (MIL(n)). As found previously for CS2 in monocationic ILs, the intermolecular spectrum of CS2 in dicationic ILs is lower in frequency and narrower than that of neat CS2. The new result is that the intermolecular spectrum of CS2 is higher in frequency in DIL(2n) than in the corresponding MIL(n), indicating that CS2 molecules experience a stiffer potential in dicationic ILs than in monocationic ILs. The intermolecular dynamics of CS2 being higher in frequency in DIL(2n) than in MIL(n) is consistent with recent molecular dynamics simulations (Lynden-Bell and Quitevis, J. Chem. Phys., 2018, 148, 193844) that show the stiffer potential is the result of greater confinement of CS2 in DIL(2n) than in MIL(n). We also show in this study how effects due to dilution and the intermolecular potential seen by a solute molecule in solution are unraveled.
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Affiliation(s)
- Eshan Gurung
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409, USA.
| | - Dujuan Meng
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409, USA.
| | - Lianjie Xue
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409, USA.
| | - George Tamas
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409, USA.
| | - Ruth M Lynden-Bell
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Edward L Quitevis
- Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX 79409, USA.
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19
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Jamali SH, Hartkamp R, Bardas C, Söhl J, Vlugt TJH, Moultos OA. Shear Viscosity Computed from the Finite-Size Effects of Self-Diffusivity in Equilibrium Molecular Dynamics. J Chem Theory Comput 2018; 14:5959-5968. [PMID: 30296092 PMCID: PMC6236468 DOI: 10.1021/acs.jctc.8b00625] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
A method is proposed for calculating
the shear viscosity of a liquid
from finite-size effects of self-diffusion coefficients in Molecular
Dynamics simulations. This method uses the difference in the self-diffusivities,
computed from at least two system sizes, and an analytic equation
to calculate the shear viscosity. To enable the efficient use of this
method, a set of guidelines is developed. The most efficient number
of system sizes is two and the large system is at least four times
the small system. The number of independent simulations for each system
size should be assigned in such a way that 50%–70% of the total
available computational resources are allocated to the large system.
We verified the method for
250 binary and 26 ternary Lennard-Jones systems, pure water, and an
ionic liquid ([Bmim][Tf2N]). The computed shear viscosities
are in good agreement with viscosities obtained from equilibrium Molecular
Dynamics simulations for all liquid systems far from the critical
point. Our results indicate that the proposed method is suitable for
multicomponent mixtures and highly viscous liquids. This may enable
the systematic screening of the viscosities of ionic liquids and deep
eutectic solvents.
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Affiliation(s)
- Seyed Hossein Jamali
- Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering , Delft University of Technology , Leeghwaterstraat 39 , 2628CB Delft , The Netherlands
| | - Remco Hartkamp
- Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering , Delft University of Technology , Leeghwaterstraat 39 , 2628CB Delft , The Netherlands
| | - Christos Bardas
- Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering , Delft University of Technology , Leeghwaterstraat 39 , 2628CB Delft , The Netherlands
| | - Jakob Söhl
- Delft Institute of Applied Mathematics , Delft University of Technology , van Mourik Broekmanweg 6 , 2628XE Delft , The Netherlands
| | - Thijs J H Vlugt
- Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering , Delft University of Technology , Leeghwaterstraat 39 , 2628CB Delft , The Netherlands
| | - Othonas A Moultos
- Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering , Delft University of Technology , Leeghwaterstraat 39 , 2628CB Delft , The Netherlands
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20
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Lynden-Bell RM, Quitevis EL. A simulation study of CS2 solutions in two related ionic liquids with dications and monocations. J Chem Phys 2018; 148:193844. [DOI: 10.1063/1.5008801] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Affiliation(s)
- R. M. Lynden-Bell
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - E. L. Quitevis
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, USA
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21
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Kakinuma S, Ramati S, Wishart JF, Shirota H. Effects of aromaticity in cations and their functional groups on the temperature dependence of low-frequency spectrum. J Chem Phys 2018; 148:193805. [DOI: 10.1063/1.5010066] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Shohei Kakinuma
- Department of Nanomaterial Science, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Sharon Ramati
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - James F. Wishart
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - Hideaki Shirota
- Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
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22
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Kakinuma S, Shirota H. Femtosecond Raman-Induced Kerr Effect Study of Temperature-Dependent Intermolecular Dynamics in Molten Bis(trifluoromethylsulfonyl)amide Salts: Effects of Cation Species. J Phys Chem B 2018; 122:6033-6047. [DOI: 10.1021/acs.jpcb.8b03302] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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23
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Majhi D, Seth S, Sarkar M. Differences in the behavior of dicationic and monocationic ionic liquids as revealed by time resolved-fluorescence, NMR and fluorescence correlation spectroscopy. Phys Chem Chem Phys 2018; 20:7844-7856. [PMID: 29508863 DOI: 10.1039/c7cp08630j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With an aim to understand the behavior in terms of the intermolecular interactions, structure and dynamics of dicationic and monocationic ionic liquids (ILs), two imidazolium-based dicationic ionic liquids (DILs), 1,8-bis-(3-methylimidazolium-1-yl)octane bis-(trifluoromethylsulfonyl)amide ([C8(mim)2][NTf2]2), 1,9-bis-(3-methylimidazolium-1-yl)nonane bis-(trifluoromethylsulfonyl)amide ([C9(mim)2][NTf2]2), and one monocationic ionic liquid (MIL), 1-butyl-3-methyl imidazolium bis(trifluoromethylsulfonyl)amide ([C4(mim)][NTf2]), have been investigated through combined fluorescence, electron paramagnetic resonance (EPR), NMR and fluorescence correlation spectroscopy (FCS). The DILs were synthesized by following a standard synthetic protocol and subsequently characterized by different analytical techniques. Steady state absorption, emission and EPR spectroscopic data reveal that DILs are less polar compared to MIL. The polarities of the DILs and MIL were found to be close to those of acetonitrile and short chain alcohols, respectively. The excitation wavelength dependent emission data reveals that DILs are more micro-heterogeneous in nature than MIL. The rotational diffusion of two organic solutes, perylene and 8-methoxypyrene-1,3,6-sulfonate (MPTS), were examined in the DILs and MIL. The rotational diffusion data for perylene and MPTS were analyzed in light of the Stokes-Einstein-Debye (SED) hydrodynamic theory. The rotation of perylene in the DILs was observed to be relatively faster to that in the MIL, and it goes beyond the limit predicted by the SED theory. In order to explain the rotational motion of perylene in DILs, the data was analyzed further by invoking quasi-hydrodynamic theory. The observed rotational behavior of perylene has been explained by considering the fact that perylene is located in the nonpolar region of ILs, and larger solvent molecules (DILs) induce a lower friction to the rotating solute. Interestingly, unlike perylene, rotations of MPTS in both of the ILs were observed to be much hindered indicating a relatively stronger MPTS-IL interaction than perylene-IL interaction. More interestingly, rotation of MPTS was observed to be faster in the DILs than that in the MIL despite the fact that DILs are more viscous than MILs. Relatively faster rotation of MPTS in DILs has been explained by resorting to NMR and FCS studies. The outcomes of the NMR and FCS studies revealed that DILs in the experimental condition exist in their folded form and because of this structural restriction of DILs it becomes difficult for the bulky MPTS to make stronger hydrogen bonding interactions with DILs, which eventually makes the rotation of MPTS in DILs faster. Essentially, the outcomes of all of these studies have demonstrated that the behavior of DILs is quite different to that of the usual MILs.
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Affiliation(s)
- Debashis Majhi
- School of Chemical Sciences, National Institute of Science Education and Research, HBNI, P.O. Jatni, Khurda 752050, Bhubaneswar, Odisha, India.
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24
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Yang X, Fang Y. Synthesis and properties of novel ammonium-based room-temperature gemini ionic liquids. RSC Adv 2018; 8:26255-26265. [PMID: 35541925 PMCID: PMC9082928 DOI: 10.1039/c8ra04127j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 07/03/2018] [Indexed: 01/04/2023] Open
Abstract
Ammonium-based room-temperature asymmetrical gemini ionic liquids, 1-trimethylammonium-3-(pyridinium)propane bisdicyanamide ([N111C3Py][DCA]2) and 1-trimethylammonium-3-(1-methylpiperidinium)propane bisdicyanamide ([N111C3MPi][DCA]2) were respectively synthesized and structurally characterized by 1H NMR and 13C NMR. Thermal stability of the gemini ionic liquids was determined by thermogravimetric analysis under a pure nitrogen atmosphere. Densities and viscosities of pure GILs and their binary mixtures with acetonitrile (MeCN) were investigated over the entire range of mole fractions at various temperatures, from 288.15 to 333.15 K, under atmospheric pressure. Moreover, the excess molar volumes (VEm) and the viscosity deviations (Δη) of the binary mixtures were evaluated and well fitted to the Redlich–Kister polynomial expression. The negative values of VEm and Δη result from strong self-association and interaction between the gemini ionic liquid molecules and MeCN. Results are discussed in terms of molecular interactions and structures. Ammonium-based asymmetrical gemini ionic liquids, 1-trimethylammonium-3-(pyridinium)propane bisdicyanamide and 1-trimethylammonium-3-(1-methylpiperidinium)propane bisdicyanamide were respectively synthesized and characterized by 1H NMR and 13C NMR.![]()
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Affiliation(s)
- Xuzhao Yang
- The Key Laboratory of Synthetic and Biological Colloids
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
| | - Yun Fang
- The Key Laboratory of Synthetic and Biological Colloids
- Ministry of Education
- School of Chemical and Material Engineering
- Jiangnan University
- Wuxi 214122
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25
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Casalegno M, Raos G, Appetecchi GB, Passerini S, Castiglione F, Mele A. From Nanoscale to Microscale: Crossover in the Diffusion Dynamics within Two Pyrrolidinium-Based Ionic Liquids. J Phys Chem Lett 2017; 8:5196-5202. [PMID: 28976762 DOI: 10.1021/acs.jpclett.7b02431] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Knowledge of the ion motion in room temperature ionic liquids (RTILs) is critical for their applications in a number of fields, from lithium batteries to dye-sensitized solar cells. Experiments on a limited number of RTILs have shown that on macroscopic time scales the ions typically undergo conventional, Gaussian diffusion. On shorter time scales, however, non-Gaussian behavior has been observed, similar to supercooled fluids, concentrated colloidal suspensions, and more complex systems. Here we characterize the diffusive motion of ionic liquids based on the N-butyl-N-methylpyrrolidinium (PYR14) cation and bis(trifluoro methanesulfonyl)imide (TFSI) or bis(fluorosulfonyl)imide (FSI) anions. A combination of pulsed gradient spin-echo (PGSE) NMR experiments and molecular dynamics (MD) simulations demonstrates a crossover from subdiffusive behavior to conventional Gaussian diffusion at ∼10 ns. The deconvolution of molecular displacements into a continuous spectrum of diffusivities shows that the short-time behavior is related to the effects of molecular caging. For PYR14FSI, we identify the change of short-range ion-counterion associations as one possible mechanism triggering long-range displacements.
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Affiliation(s)
- Mosè Casalegno
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano , Piazza L. Da Vinci, 32, 20133 Milano, Italy
| | - Guido Raos
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano , Piazza L. Da Vinci, 32, 20133 Milano, Italy
| | - Giovanni Battista Appetecchi
- ENEA, Italian National Agency for New Technology, Energy and Sustainable Economic Development, Materials and Physicochemical Processes Laboratory , Via Anguillarese 301, 00196 Rome, Italy
| | - Stefano Passerini
- Helmholtz Institute Ulm, Karlsruhe Institute of Technology , Helmholtzstrasse 11, 89081 Ulm, Germany
- Karlsruhe Institute of Technology , P.O. Box 3640, 76131 Karlsruhe, Germany
| | - 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
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26
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Khakan H, Yeganegi S. Molecular Dynamics Simulations of Amide Functionalized Imidazolium Bis(trifluoromethanesulfonyl)imide Dicationic Ionic Liquids. J Phys Chem B 2017; 121:7455-7463. [PMID: 28704995 DOI: 10.1021/acs.jpcb.7b03917] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In the present study, the structure and dynamics of three dicationic ionic liquids (DILs) with a functional amide group in the imidazolium ring with bis(trifluoromethanesulfonyl)imide, [TFSI]- anion has been studied by molecular dynamics (MD) simulations. Densities, radial distribution functions (RDFs), combined distribution functions (CDFs), spatial distribution functions, mean-square displacements (MSD), and self-diffusivities for the ions have been calculated from the MD simulations. The calculated densities for [C4(amim)2][TFSI]2 at different temperatures agreed well with the experimental values. The calculated RDFs and CDFs show that the anions are well organized around the amide group and imidazolium rings and the favorite sites of interaction of the [TFSI]- ion are the hydrogen atoms of the amide group and hydrogen atoms of the imidazolium ring of the cation. The calculated MSDs indicated that the diffusion coefficients of the studied DILs are 1 order of magnitude smaller than those of DILs with a comparable molar mass.
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Affiliation(s)
- Hassan Khakan
- Department of Physical Chemistry, University of Mazandaran , Babolsar 47415, Iran
| | - Saeid Yeganegi
- Department of Physical Chemistry, University of Mazandaran , Babolsar 47415, Iran
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27
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M. Yaman S, Mohamad S, A. Manan NS. How do isomeric ortho, meta and paradicationic ionic liquids impact the production of 5-hydroxymethylfurfural? J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.02.076] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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28
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Patro LN, Burghaus O, Roling B. Nonlinear permittivity spectra of supercooled ionic liquids: Observation of a "hump" in the third-order permittivity spectra and comparison to double-well potential models. J Chem Phys 2017; 146:154503. [PMID: 28433008 DOI: 10.1063/1.4979600] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
We have measured the third-order permittivity spectra ε33 of a monocationic and of a dicationic liquid close to the glass transition temperature by applying ac electric fields with large amplitudes up to 180 kV/cm. A peak ("hump") in the modulus of ε33 is observed for a mono-cationic liquid after subtraction of the dc contribution from the imaginary part of ε33. We show that the origin of this experimental "hump" is a peak in the imaginary part of ε33, with the peak height strongly increasing with decreasing temperature. Overall, the spectral shape of the third-order permittivity of both ionic liquids is similar to the predictions of a symmetric double well potential model, although this model does not predict a "hump" in the modulus. In contrast, an asymmetric double well potential model predicts a "hump," but the spectral shape of both the real and imaginary part of ε33 deviates significantly from the experimental spectra. These results show that not only the modulus of ε33 but also its phase is an important quantity when comparing experimental results with theoretical predictions.
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Affiliation(s)
- L N Patro
- Department of Chemistry, Philipps University of Marburg, Marburg 35032, Germany
| | - O Burghaus
- Department of Chemistry, Philipps University of Marburg, Marburg 35032, Germany
| | - B Roling
- Department of Chemistry, Philipps University of Marburg, Marburg 35032, Germany
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29
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Kakinuma S, Ishida T, Shirota H. Femtosecond Raman-Induced Kerr Effect Study of Temperature-Dependent Intermolecular Dynamics in Imidazolium-Based Ionic Liquids: Effects of Anion Species and Cation Alkyl Groups. J Phys Chem B 2017; 121:250-264. [DOI: 10.1021/acs.jpcb.6b11009] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Tateki Ishida
- Department
of Theoretical and Computational Molecular Science, Institute for Molecular Science, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
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30
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Yao W, Wang H, Pei Y, Chen Y, Li Z, Wang J. Homogeneous capture and heterogeneous separation of proteins by PEG-functionalized ionic liquid–water systems. RSC Adv 2017. [DOI: 10.1039/c6ra28483c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
An efficient homogeneous capture and heterogeneous separation strategy for proteins is reported using PEG-functionalized ionic liquids with LCST phase behavior in water.
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Affiliation(s)
- Wenhui Yao
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- School of Chemistry and Chemical Engineering
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- Henan Normal University
| | - Huiyong Wang
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- School of Chemistry and Chemical Engineering
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- Henan Normal University
| | - Yuanchao Pei
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- School of Chemistry and Chemical Engineering
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- Henan Normal University
| | - Yuehua Chen
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- School of Chemistry and Chemical Engineering
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- Henan Normal University
| | - Zhiyong Li
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- School of Chemistry and Chemical Engineering
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- Henan Normal University
| | - Jianji Wang
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- School of Chemistry and Chemical Engineering
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- Henan Normal University
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31
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Verma PL, Bartolotti LJ, Gejji SP. Probing Molecular Interactions in Functionalized Asymmetric Quaternary Ammonium-Based Dicationic Ionic Liquids. J Phys Chem A 2016; 120:7732-7744. [DOI: 10.1021/acs.jpca.6b07337] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Prakash L. Verma
- Department
of Chemistry, Savitribai Phule Pune University, Pune 411 007, India
| | - Libero J. Bartolotti
- Department
of Chemistry, East Carolina University, Greenville, North Carolina 27858-4353, United States
| | - Shridhar P. Gejji
- Department
of Chemistry, Savitribai Phule Pune University, Pune 411 007, India
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32
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Shirota H, Kakinuma S, Takahashi K, Tago A, Jeong H, Fujisawa T. Ultrafast Dynamics in Aromatic Cation Based Ionic Liquids: A Femtosecond Raman-Induced Kerr Effect Spectroscopic Study. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2016. [DOI: 10.1246/bcsj.20160085] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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33
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Hooshyari K, Javanbakht M, Adibi M. Novel composite membranes based on PBI and dicationic ionic liquids for high temperature polymer electrolyte membrane fuel cells. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.04.115] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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34
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Patro LN, Burghaus O, Roling B. Anomalous Wien Effects in Supercooled Ionic Liquids. PHYSICAL REVIEW LETTERS 2016; 116:185901. [PMID: 27203333 DOI: 10.1103/physrevlett.116.185901] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Indexed: 06/05/2023]
Abstract
We have measured conductivity spectra of several supercooled monocationic and dicationic ionic liquids in the nonlinear regime by applying ac electric fields with large amplitudes up to about 180 kV/cm. Thereby, higher harmonic ac currents up to the 7th order were detected. Our results point to the existence of anomalous Wien effects in supercooled ionic liquids. Most ionic liquids studied here exhibit a conductivity-viscosity relation, which is close to the predictions of the Nernst-Einstein and Stokes-Einstein equations, as observed for classical strong electrolytes like KCl. These "strong" ionic liquids show a much stronger nonlinearity of the conductivity than classical strong electrolytes. On the other hand, the conductivity-viscosity relation of the ionic liquid [P_{6,6,6,14}][Cl] points to ion association effects. This "weak" ionic liquid shows a strength of the nonlinear effect, which is comparable to classical weak electrolytes. However, the nonlinearity increases quadratically with the field. We suggest that a theory for explaining these anomalies will have to go beyond the level of Coulomb lattice gas models.
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Affiliation(s)
- L N Patro
- Department of Chemistry, Philipps University of Marburg, Marburg, 35032, Germany
| | - O Burghaus
- Department of Chemistry, Philipps University of Marburg, Marburg, 35032, Germany
| | - B Roling
- Department of Chemistry, Philipps University of Marburg, Marburg, 35032, Germany
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35
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Shirota H, Kakinuma S, Itoyama Y, Umecky T, Takamuku T. Effects of Tetrafluoroborate and Bis(trifluoromethylsulfonyl)amide Anions on the Microscopic Structures of 1-Methyl-3-octylimidazolium-Based Ionic Liquids and Benzene Mixtures: A Multiple Approach by ATR-IR, NMR, and Femtosecond Raman-Induced Kerr Effect Spectroscopy. J Phys Chem B 2016; 120:513-26. [DOI: 10.1021/acs.jpcb.5b10917] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hideaki Shirota
- Department
of Nanomaterial Science and Department of Chemistry, Chiba University, 1-33
Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Shohei Kakinuma
- Department
of Nanomaterial Science and Department of Chemistry, Chiba University, 1-33
Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Yu Itoyama
- Department
of Chemistry and Applied Chemistry, Graduate School of Science and
Engineering, Saga University, Honjo-machi, Saga 840-8502, Japan
| | - Tatsuya Umecky
- Department
of Chemistry and Applied Chemistry, Graduate School of Science and
Engineering, Saga University, Honjo-machi, Saga 840-8502, Japan
| | - Toshiyuki Takamuku
- Department
of Chemistry and Applied Chemistry, Graduate School of Science and
Engineering, Saga University, Honjo-machi, Saga 840-8502, Japan
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36
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Serva A, Migliorati V, Lapi A, Aquilanti G, Arcovito A, D'Angelo P. Structural properties of geminal dicationic ionic liquid/water mixtures: a theoretical and experimental insight. Phys Chem Chem Phys 2016; 18:16544-54. [DOI: 10.1039/c6cp01557c] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The structural properties of geminal dicationic ionic liquid/water mixtures have been investigated using EXAFS spectroscopy and molecular dynamics simulations.
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Affiliation(s)
- Alessandra Serva
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
| | | | - Andrea Lapi
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
- Istituto CNR di Metodologie Chimiche-IMC
| | | | - Alessandro Arcovito
- Istituto di Biochimica e Biochimica Clinica
- Università Cattolica del Sacro Cuore
- 00168 Roma
- Italy
| | - Paola D'Angelo
- Dipartimento di Chimica
- Università di Roma “La Sapienza”
- 00185 Roma
- Italy
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37
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Liu Y, Li S, Li K, Zheng Y, Zhang M, Cai C, Yu C, Zhou Y, Yan D. A srikaya-like light-harvesting antenna based on graphene quantum dots and porphyrin unimolecular micelles. Chem Commun (Camb) 2016; 52:9394-7. [DOI: 10.1039/c6cc03595g] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A novel hybrid light-harvesting antenna with a srikaya-like structure of multi-graphene quantum dots (GQDs) as donors and one porphyrin unimolecular micelle as the acceptor was constructed through electrostatic self-assembly.
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Affiliation(s)
- Yannan Liu
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal
- Matrix Composites
- Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing
- Shanghai Jiao Tong University
| | - Shanlong Li
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal
- Matrix Composites
- Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing
- Shanghai Jiao Tong University
| | - Ke Li
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal
- Matrix Composites
- Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing
- Shanghai Jiao Tong University
| | - Yongli Zheng
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal
- Matrix Composites
- Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing
- Shanghai Jiao Tong University
| | - Meng Zhang
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal
- Matrix Composites
- Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing
- Shanghai Jiao Tong University
| | - Caiyun Cai
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal
- Matrix Composites
- Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing
- Shanghai Jiao Tong University
| | - Chunyang Yu
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal
- Matrix Composites
- Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing
- Shanghai Jiao Tong University
| | - Yongfeng Zhou
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal
- Matrix Composites
- Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing
- Shanghai Jiao Tong University
| | - Deyue Yan
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Metal
- Matrix Composites
- Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing
- Shanghai Jiao Tong University
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38
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Kirchner B, Malberg F, Firaha DS, Hollóczki O. Ion pairing in ionic liquids. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:463002. [PMID: 26509867 DOI: 10.1088/0953-8984/27/46/463002] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In the present article we briefly review the extensive discussion in literature about the presence or absence of ion pair-like aggregates in ionic liquids. While some experimental studies point towards the presence of neutral subunits in ionic liquids, many other experiments cannot confirm or even contradict their existence. Ion pairs can be detected directly in the gas phase, but no direct method is available to observe such association behavior in the liquid, and the corresponding indirect experimental proofs are based on such assumptions as unity charges at the ions. However, we have shown by calculating ionic liquid clusters of different sizes that assuming unity charges for ILs is erroneous, because a substantial charge transfer is taking place between the ionic liquid ions that reduce their total charge. Considering these effects might establish a bridge between the contradicting experimental results on this matter. Beside these results, according to molecular dynamics simulations the lifetimes of ion-ion contacts and their joint motions are far too short to verify the existence of neutral units in these materials.
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Affiliation(s)
- Barbara Kirchner
- Mulliken Center for Theoretical Chemistry, Institut für Physikalische und Theoretische Chemie Universität Bonn, Beringstraße 4+6, D-53115 Bonn, Germany
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39
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Kumar Sahu P, Ghosh A, Sarkar M. Understanding Structure-Property Correlation in Monocationic and Dicationic Ionic Liquids through Combined Fluorescence and Pulsed-Field Gradient (PFG) and Relaxation NMR Experiments. J Phys Chem B 2015; 119:14221-35. [PMID: 26447540 DOI: 10.1021/acs.jpcb.5b07357] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Steady state, time-resolved fluorescence and NMR experiments are carried out to gain deeper insights into the structure-property correlation in structurally similar monocationic and dicationic room-temperature ionic liquids (RTILs). The excitation wavelength dependent fluorescence response of fluorophore in 1-methy-3-propyllimidazolium bis(trifluoromethylsulfonyl)amide [C3MIm][NTf2] is found to be different from that of 1,6-bis(3-methylimidazolium-1-yl)hexane bis(trifluoromethylsulfonyl)amide [C6(MIm)2][NTf2]2 and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide [C6MIm][NTf2]. The outcomes of the present solvent dynamics study in [C3MIm][NTf2] when compared with those in [C6(MIm)2][NTf2]2 and in [C6MIm][NTf2] from our previous studies (Phys. Chem. Chem. Phys. 2014, 16, 12918-12928) indicate the involvement of dipolar rotation of imidazolium cation during solvation. To correlate the findings of solvation dynamics study with the dipolar rotation of the imidazolium ring, pulsed-field gradient (PFG)-NMR technique for translational diffusion coefficient measurement and (1)H as well as (19)F spin-lattice relaxation measurements are employed. NMR investigation reveals that an ultrafast component of solvation can be related to the dipolar rotation of imidazolium cation; hence, the role of dipolar rotation of cations in governing the dynamics of solvation in ILs cannot be ignored. Analysis of the rotational relaxation dynamics data by the Stokes-Einstein-Debye hydrodynamic theory unveils distinctive features of solute-solvent interaction in [C3MIm][NTf2] and [C6(MIm)2][NTf2]2.
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Affiliation(s)
- Prabhat Kumar Sahu
- School of Chemical Sciences, National Institute of Science Education and Research , Bhubaneswar 751005, India
| | - Arindam Ghosh
- 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
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40
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Shirota H, Kakinuma S. Temperature Dependence of Low-Frequency Spectra in Molten Bis(trifluoromethylsulfonyl)amide Salts of Imidazolium Cations Studied by Femtosecond Raman-Induced Kerr Effect Spectroscopy. J Phys Chem B 2015; 119:9835-46. [DOI: 10.1021/acs.jpcb.5b01776] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hideaki Shirota
- Department of Nanomaterial Science & Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Shohei Kakinuma
- Department of Nanomaterial Science & Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
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41
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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
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42
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Yoshida T, Kawai A, Khara DC, Samanta A. Temporal Behavior of the Singlet Molecular Oxygen Emission in Imidazolium and Morpholinium Ionic Liquids and Its Implications. J Phys Chem B 2015; 119:6696-702. [DOI: 10.1021/acs.jpcb.5b01996] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tsuyoshi Yoshida
- Department
of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H89 Ohokayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Akio Kawai
- Department
of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H89 Ohokayama, Meguro-ku, Tokyo 152-8551, Japan
| | | | - Anunay Samanta
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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43
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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
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44
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Palchowdhury S, Bhargava BL. Effect of spacer chain length on the liquid structure of aqueous dicationic ionic liquid solutions: molecular dynamics studies. Phys Chem Chem Phys 2015; 17:11627-37. [DOI: 10.1039/c5cp00873e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Cations in an aqueous [C16(MIm)2][2Br] solution aggregate spontaneously to form micelles, with a hydrophobic core composed of spacer alkyl chains and a hydrophilic surface composed of imidazolium head groups.
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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
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45
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Li S, Bañuelos JL, Zhang P, Feng G, Dai S, Rother G, Cummings PT. Toward understanding the structural heterogeneity and ion pair stability in dicationic ionic liquids. SOFT MATTER 2014; 10:9193-9200. [PMID: 25328976 DOI: 10.1039/c4sm01742k] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The structural and dynamical properties of dicationic ionic liquids (DILs) [Cn(mim)2](Tf2N)2, that is, 3-methylimidazolium dications separated by an alkyl chain and with bis(trifluoromethylsulfonyl)amide as the anion, were investigated by molecular dynamics (MD) simulation in combination with small/wide-angle X-ray scattering (SWAXS) measurements. Enhanced spatial heterogeneity is observed as the DIL chain length is increased, characterized by the changes in the scattering and the increased heterogeneity order parameter (HOP). Temperature variation imposes only slight influences on the local structures of DILs compared to monocationic ionic liquids (MILs). The peaks at 0.9 Å(-1) and 1.4 Å(-1) of the structure function shift towards low Q as the temperature increases, in a similar manner to MILs, and changes in peak positions in response to temperature changes are reflected in HOP variations. However, the prepeak shift with increasing temperature is ∼3 times smaller in DILs compared to MILs, and both MD and SWAXS indicate a DIL-specific prepeak shifting. Furthermore, the high ion pair/ion cage stability in DILs is indicative of high thermal stability and relative insensitivity of structural heterogeneity to temperature variation, which might be caused by the stronger Coulombic interactions in DILs.
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Affiliation(s)
- Song Li
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN 37235, USA
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46
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Shirota H, Matsuzaki H, Ramati S, Wishart JF. Effects of Aromaticity in Cations and Their Functional Groups on the Low-Frequency Spectra and Physical Properties of Ionic Liquids. J Phys Chem B 2014; 119:9173-87. [DOI: 10.1021/jp509412z] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
| | | | - Sharon Ramati
- Chemistry
Department, Brookhaven National Laboratory, Upton, New York 11973-5000, United States
| | - James F. Wishart
- Chemistry
Department, Brookhaven National Laboratory, Upton, New York 11973-5000, United States
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47
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Biswas R, Das A, Shirota H. Low-frequency collective dynamics in deep eutectic solvents of acetamide and electrolytes: A femtosecond Raman-induced Kerr effect spectroscopic study. J Chem Phys 2014; 141:134506. [DOI: 10.1063/1.4897207] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Affiliation(s)
- Ranjit Biswas
- Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, J. D. Block, Sec. III, Salt Lake, Kolkata 700 098, West Bengal, India
| | - Anuradha Das
- Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, J. D. Block, Sec. III, Salt Lake, Kolkata 700 098, West Bengal, India
| | - Hideaki Shirota
- Department of Nanomaterial Science and Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
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48
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Sonnleitner T, Turton DA, Hefter G, Ortner A, Waselikowski S, Walther M, Wynne K, Buchner R. Ultra-Broadband Dielectric and Optical Kerr-Effect Study of the Ionic Liquids Ethyl and Propylammonium Nitrate. J Phys Chem B 2014; 119:8826-41. [PMID: 24945675 DOI: 10.1021/jp502935t] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Dielectric relaxation (DR) and optical Kerr-effect (OKE) spectra of the archetypal protic ionic liquids ethyl- and propylammonium nitrate (EAN and PAN) have been measured over an unusually large frequency range from 200 MHz to 10 THz at temperatures (mostly) between 5 and 65 °C. Analysis of the low-frequency α-relaxation, associated with the cooperative relaxations of the cations (DR) and anions (OKE) and any clusters present, indicated that ion reorientation in EAN is decoupled from viscosity and occurs via cooperative relaxation involving large-angle jumps rather than rotational diffusion. Detailed consideration of the high-frequency parts of the DR and OKE spectra showed that the observed intensities were a complex combination of overlapping and possibly coupled modes. In addition to previously identified intermolecular H-bond vibrations, there are significant contributions from the librations of the cations and anions. The present assignments were shown to be consistent with the isotopic shifts observed for deuterated EAN.
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Affiliation(s)
- Thomas Sonnleitner
- †Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Universitatsstr. 31, D-93040 Regensburg, Germany
| | - David A Turton
- ‡School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, United Kingdom
| | - Glenn Hefter
- §Chemistry Department, Murdoch University, Murdoch, W.A. 6150, Australia
| | - Alexander Ortner
- ∥Department of Molecular and Optical Physics, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - Stefan Waselikowski
- ∥Department of Molecular and Optical Physics, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - Markus Walther
- ∥Department of Molecular and Optical Physics, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - Klaas Wynne
- ‡School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, United Kingdom
| | - Richard Buchner
- †Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Universitatsstr. 31, D-93040 Regensburg, Germany
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49
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Androulaki E, Vergadou N, Economou IG. Analysis of the heterogeneous dynamics of imidazolium-based [Tf2N−] ionic liquids using molecular simulation. Mol Phys 2014. [DOI: 10.1080/00268976.2014.906670] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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50
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D'Anna F, Noto R. Di- and Tricationic Organic Salts: An Overview of Their Properties and Applications. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301871] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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