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Memar ZO, Moosavi M. Uncovering the Properties of Dicationic Ionic Liquid Nanodroplets through Ab Initio Molecular Dynamics Simulations. J Phys Chem B 2023; 127:9111-9131. [PMID: 37843820 DOI: 10.1021/acs.jpcb.3c03585] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
The behavior of nanodroplets of an imidazolium-based dicationic ionic liquid, i.e., [C1(mim)2][PF6]2, was investigated in this study using ab initio molecular dynamics simulations. The vibrational features as well as the structural, interfacial, and dynamical properties of different sized droplets were analyzed and compared to the bulk phase system. Structural properties of the droplets, such as π-π stacking, radial distribution functions, structure factors, combined distribution functions, and angular distribution functions were analyzed to understand the interactions and orientations of their ions. The vibrational features and hydrogen bonding strength of droplets were studied by calculating their infrared (IR) and power spectra, determining the contribution of different types of hydrogen bonding to each vibrational mode. The calculated spectra showed good overall agreement with the experimental results. The interfacial properties of the droplets and the orientation of their ions were analyzed using density profiles and an exposed surface. The results showed that, in all systems studied, cations and anions were equally likely to exist in both inner and outer layers, and the cations tended to be oriented toward the center of droplets with obtuse angles. Additionally, the droplet densities were extrapolated to predict the bulk phase density with less than 2% deviation. The dynamical properties of hydrogen bonds, mean square displacement, and van Hove correlations of cations and anions were also analyzed. The results indicated that there was no regular trend in the dynamic properties of droplets with an increasing system size.
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Affiliation(s)
| | - Majid Moosavi
- Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
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2
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Chen Y, Han X, Liu Z, Li Y, Sun H, Wang H, Wang J. Thermal decomposition and volatility of ionic liquids: Factors, evaluation and strategies. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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3
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Cation-Anion Interactions, Stability, and IR Spectra of Dicationic Amino Acid-Based Ionic Liquids Probed Using Density Functional Theory. J Mol Model 2021; 27:180. [PMID: 34023983 DOI: 10.1007/s00894-021-04796-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Accepted: 05/11/2021] [Indexed: 10/21/2022]
Abstract
In this work, we have theoretically studied the dicationic ionic liquids (DILs) constructed from geminal methylimidazolium dication with varying amino acid anions and spacers using density functional theory. Amino acid-based DILs form via strong C-H···O hydrogen bonds. These hydrogen bonds have a significant role in stabilizing the DILs. The higher cation-anion interaction energy in the order of covalent bond energy and liquid density of DILs imply higher thermal stability than their mono analogues. The C-H stretching frequencies are above 3100 cm-1 in all complexes and form a signature for DILs. Interestingly, aliphatic and aromatic amino acid anions show similar molecular properties. Overall, the DILs formed from amino acids exhibit high stability and large surface tension and are chemically non-toxic; hence, they can replace inorganic DILs.
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4
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Torkzadeh M, Moosavi M. Probing the Effect of Side Alkyl Chain Length on the Structural and Dynamical Micro-heterogeneities in Dicationic Ionic Liquids. J Phys Chem B 2020; 124:11446-11462. [PMID: 33283503 DOI: 10.1021/acs.jpcb.0c07034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The molecular dynamics simulations and Voronoi tessellation analysis of two dicationic ionic liquids (DILs) including [C5(mim)2][NTf2]2 and [C5(mim)2C4][NTf2]2 have been carried out to investigate the effects of side alkyl chain length on the structural and dynamical micro-heterogeneity of these DILs. Radial distribution functions (RDFs), spatial distribution functions (SDFs), and also neighborhood analysis of ions have been calculated to determine the arrangement of the nearest neighboring ions. To better understand the hydrogen-bonding network, microstructures, inter- and intramolecular orientations of ions in the studied DILs, different kinds of combined distribution functions (CDFs) were computed and analyzed. Also, qualitative and quantitative analyses of the structural heterogeneity were explored through total/partial structure factors, heterogeneity order parameters (HOPs), and domain analysis from Voronoi tessellation. The results showed that the side alkyl chains in DILs have significant effects on their micro-organizations in such a way that [C5(mim)2C4][NTf2]2 with longer side chains has more microstructural heterogeneity than [C5(mim)2][NTf2]2 where the linkage alkyl chain is the same in both of them. Furthermore, to shed light on the dynamical heterogeneity, ion pair, ion cage, and hydrogen-bond stabilities and also the reorientation dynamics of ions have been investigated. Results demonstrated that local dynamics differences originate from local structural heterogeneity.
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Affiliation(s)
| | - Majid Moosavi
- Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
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5
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Vapor Pressure Mapping of Ionic Liquids and Low-Volatility Fluids Using Graded Isothermal Thermogravimetric Analysis. CHEMENGINEERING 2019. [DOI: 10.3390/chemengineering3020042] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
One of the hallmarks of ionic liquids (ILs) and a critical part of their sustainable implementation is their low volatility, although statements in this regard are frequently made in the absence of a critical evaluation. Although it is generally accepted that conventional ILs exhibit significantly reduced vapor pressures relative to common organic solvents, glib statements about ILs having zero volatility can no longer be abided, even if a concrete temperature-dependent vapor pressure, Pvap(T), framework for placement of IL performance has not yet been established. In this communication, Pvap(T) values of 30 illustrative low-volatility fluids—including representative imidazolium-, ammonium-, and pyrrolidinium-based aprotic ILs; examples of protic, polymeric, and di-cationic ILs; as well as deep eutectic solvents (DESs) and glycols—were determined using a simple, convenient, and reproducible isothermal thermogravimetric method. Guided by this “vapor pressure map”, observed trends can be discussed in terms of anion basicity, cation geometry, alkane chain length, hydrogen bonding strength, and van der Waals forces, providing a context for the placement of theoretical and experimental vapor pressures gleaned in future IL and DES studies.
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6
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Clarke CJ, Puttick S, Sanderson TJ, Taylor AW, Bourne RA, Lovelock KRJ, Licence P. Thermal stability of dialkylimidazolium tetrafluoroborate and hexafluorophosphate ionic liquids: ex situ bulk heating to complement in situ mass spectrometry. Phys Chem Chem Phys 2018; 20:16786-16800. [PMID: 29888367 DOI: 10.1039/c8cp01090k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Thermal decomposition (TD) products of the ionic liquids (ILs) [CnC1Im][BF4] and [CnC1Im][PF6] ([CnC1Im]+ = 1-alkyl-3-methylimidazolium, [BF4]- = tetrafluoroborate, and [PF6]- = hexafluorophosphate) were prepared, ex situ, by bulk heating experiments in a bespoke setup. The respective products, CnC1(C3N2H2)BF3 and CnC1(C3N2H2)PF5 (1-alkyl-3-methylimidazolium-2-trifluoroborate and 1-alkyl-3-methylimidazolium-2-pentafluorophosphate), were then vaporized and analyzed by direct insertion mass spectrometry (DIMS) in order to identify their characteristic MS signals. During IL DIMS experiments we were subsequently able, in situ, to identify and monitor signals due to both IL vaporization and IL thermal decomposition. These decomposition products have not been observed in situ during previous analytical vaporization studies of similar ILs. The ex situ preparation of TD products is therefore perfectly complimentary to in situ thermal stability measurements. Experimental parameters such as sample surface area to volume ratios are consequently very important for ILs that show competitive vaporization and thermal decomposition. We have explained these experimental factors in terms of Langmuir evaporation and Knudsen effusion-like conditions, allowing us to draw together observations from previous studies to make sense of the literature on IL thermal stability. Hence, the design of experimental setups are crucial and previously overlooked experimental factors.
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Affiliation(s)
- Coby J Clarke
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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7
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Chilingarov NS, Zhirov MS, Shmykova AM, Martynova EA, Glukhov LM, Chernikova EA, Kustov LM, Markov VY, Ioutsi VA, Sidorov LN. Evaporation Study of an Ionic Liquid with a Double-Charged Cation. J Phys Chem A 2018; 122:4622-4627. [PMID: 29684267 DOI: 10.1021/acs.jpca.8b02488] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The evaporation of a dicationic ionic liquid, 1,3-bis(3-methylimidazolium-1-yl)propane bis(trifluoromethanesulfonyl)amide ([C3(MIm)22+][Tf2N-]2), was studied by Knudsen effusion mass spectrometry. Its evaporation is accompanied by a partial thermal decomposition producing monocationic ionic liquids, 1,3-dimethylimidazolium and 1-(2-propenyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)amides, as volatile products. This decomposition does not affect the vaporization characteristics of [C3(MIm)22+][Tf2N-]2, which were established to be as follows. The vaporization enthalpy (550 K) is equal to (155.5 ± 3.2) kJ·mol-1; the saturated vapor pressure is described by the equation ln( p/Pa) = -(18699 ± 381)/( T/K) + (30.21 ± 0.82) in the range of 508-583 K. 1,3-Bis(3-methylimidazolium-1-yl)propane bis(trifluoromethanesulfonyl)amide is the first dicationic ionic liquid, the vaporization characteristics of which were determined with an acceptable accuracy.
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Affiliation(s)
- Norbert S Chilingarov
- Department of Chemistry , M.V. Lomonosov Moscow State University , Leninskie Gory 1/3 , Moscow 119991 , Russian Federation
| | - Maksim S Zhirov
- Department of Chemistry , M.V. Lomonosov Moscow State University , Leninskie Gory 1/3 , Moscow 119991 , Russian Federation
| | - Anna M Shmykova
- Department of Chemistry , M.V. Lomonosov Moscow State University , Leninskie Gory 1/3 , Moscow 119991 , Russian Federation
| | - Ekaterina A Martynova
- Department of Chemistry , M.V. Lomonosov Moscow State University , Leninskie Gory 1/3 , Moscow 119991 , Russian Federation
| | - Lev M Glukhov
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky prospect 47 , Moscow 119991 , Russian Federation
| | - Elena A Chernikova
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky prospect 47 , Moscow 119991 , Russian Federation
| | - Leonid M Kustov
- Department of Chemistry , M.V. Lomonosov Moscow State University , Leninskie Gory 1/3 , Moscow 119991 , Russian Federation.,N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky prospect 47 , Moscow 119991 , Russian Federation
| | - Vitaliy Yu Markov
- Department of Chemistry , M.V. Lomonosov Moscow State University , Leninskie Gory 1/3 , Moscow 119991 , Russian Federation
| | - Vitaliy A Ioutsi
- Department of Chemistry , M.V. Lomonosov Moscow State University , Leninskie Gory 1/3 , Moscow 119991 , Russian Federation
| | - Lev N Sidorov
- Department of Chemistry , M.V. Lomonosov Moscow State University , Leninskie Gory 1/3 , Moscow 119991 , Russian Federation
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8
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Moosavi M, Khashei F, Sedghamiz E. Molecular dynamics simulation of geminal dicationic ionic liquids [Cn(mim)2][NTf2]2 – structural and dynamical properties. Phys Chem Chem Phys 2018; 20:435-448. [DOI: 10.1039/c7cp05681h] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structural and dynamical properties of two dicationic ionic liquids, i.e. [Cn(mim)2][NTf2]2 with n = 3 and 5, have been studied to obtain a fundamental understanding of the molecular basis of the macroscopic and microscopic properties of the bulk liquid phase.
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Affiliation(s)
- Majid Moosavi
- Department of Chemistry
- University of Isfahan
- Isfahan 81746-73441
- Iran
| | - Fatemeh Khashei
- Department of Chemistry
- University of Isfahan
- Isfahan 81746-73441
- Iran
| | - Elaheh Sedghamiz
- Department of Chemistry
- University of Isfahan
- Isfahan 81746-73441
- Iran
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9
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Buckley M, Syres KL, Jones RG. Interactions and stabilisation of acetone, sulfur dioxide and water with 1-octyl-3-methylimidazolium tetrafluoroborate [OMIM][BF 4] at low temperatures. Faraday Discuss 2018; 206:475-495. [PMID: 28929162 DOI: 10.1039/c7fd00146k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interactions between three small molecules, water (H2O), sulfur dioxide (SO2) and acetone ((CH3)2CO), with the ionic liquid (IL) 1-octyl-3-methylimidazolium tetrafluoroborate, [OMIM][BF4], have been determined using line of sight temperature programmed desorption (LOSTPD) from a gold surface. Multilayers of the IL were deposited by physical vapour deposition with multilayers of the small molecular species (adsorbed from the gas phase) at 90 K. LOSTPD was then carried out with the small molecular species desorbing first from the mixed multilayer, followed at higher temperatures by desorption of the IL from the gold surface. The IL had a high activation energy for desorption of 126(6) kJ mol-1. Pure acetone showed a desorption activation energy of 38(2) kJ mol-1, which increased to 45-61 kJ mol-1 when it was pre-adsorbed below an overlying porous layer of the ionic liquid at 90 K. The stabilised acetone is thought to be associated with pores containing ionic moieties. Destabilised acetone was also observed and thought to originate from pores containing octyl chains. The quantity of stabilised acetone scaled with the amount of IL, being ≈1.1 molecules per IL ion pair. SO2 and H2O were co-adsorbed with the IL at 90 K leading to an intimate mixture of the two. For pure SO2 the desorption energy was 32(2) kJ mol-1, which increased to 40-52 kJ mol-1 for relative concentrations up to 6 SO2 molecules per IL ion pair. For pure water the activation energies were 49(5) kJ mol-1 and 43(1) kJ mol-1 for amorphous and crystalline ice respectively. When co-adsorbed with the IL the stabilisation energies were 42-49 kJ mol-1, but up to 505 water molecules per IL ion pair could be stabilised to some degree. The desorption mechanisms and the reasons for these interactions are discussed.
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Affiliation(s)
- Matthew Buckley
- Department of Physical Chemistry, School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.
| | - Karen L Syres
- Department of Physical Chemistry, School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.
| | - Robert G Jones
- Department of Physical Chemistry, School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK.
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10
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Lovelock KRJ. Quantifying intermolecular interactions of ionic liquids using cohesive energy densities. ROYAL SOCIETY OPEN SCIENCE 2017; 4:171223. [PMID: 29308254 PMCID: PMC5750021 DOI: 10.1098/rsos.171223] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Accepted: 10/30/2017] [Indexed: 05/25/2023]
Abstract
For ionic liquids (ILs), both the large number of possible cation + anion combinations and their ionic nature provide a unique challenge for understanding intermolecular interactions. Cohesive energy density, ced, is used to quantify the strength of intermolecular interactions for molecular liquids, and is determined using the enthalpy of vaporization. A critical analysis of the experimental challenges and data to obtain ced for ILs is provided. For ILs there are two methods to judge the strength of intermolecular interactions, due to the presence of multiple constituents in the vapour phase of ILs. Firstly, cedIP, where the ionic vapour constituent is neutral ion pairs, the major constituent of the IL vapour. Secondly, cedC+A, where the ionic vapour constituents are isolated ions. A cedIP dataset is presented for 64 ILs. For the first time an experimental cedC+A, a measure of the strength of the total intermolecular interaction for an IL, is presented. cedC+A is significantly larger for ILs than ced for most molecular liquids, reflecting the need to break all of the relatively strong electrostatic interactions present in ILs. However, the van der Waals interactions contribute significantly to IL volatility due to the very strong electrostatic interaction in the neutral ion pair ionic vapour. An excellent linear correlation is found between cedIP and the inverse of the molecular volume. A good linear correlation is found between IL cedIP and IL Gordon parameter (which are dependent primarily on surface tension). ced values obtained through indirect methods gave similar magnitude values to cedIP. These findings show that cedIP is very important for understanding IL intermolecular interactions, in spite of cedIP not being a measure of the total intermolecular interactions of an IL. In the outlook section, remaining challenges for understanding IL intermolecular interactions are outlined.
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11
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Moosavi M, Khashei F, Sharifi A, Mirzaei M. Transport Properties of Short Alkyl Chain Length Dicationic Ionic Liquids—The Effects of Alkyl Chain Length and Temperature. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.6b02881] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Majid Moosavi
- Department
of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
| | - Fatemeh Khashei
- Department
of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
| | - Ali Sharifi
- Chemistry and
Chemical Engineering Research Center of Iran, P.O.
Box 14335-186, Tehran, Iran
| | - Mojtaba Mirzaei
- Chemistry and
Chemical Engineering Research Center of Iran, P.O.
Box 14335-186, Tehran, Iran
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12
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Rocha MAA, Coutinho JAP, Santos LMNBF. Vapor pressures of 1,3-dialkylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquids with long alkyl chains. J Chem Phys 2015; 141:134502. [PMID: 25296816 DOI: 10.1063/1.4896704] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
This work presents the vapor pressure at several temperatures for the 1,3-dialkylimidazolium bis(trifluoromethylsulfonyl)imide series, [CN/2CN/2im][NTf2] (N = 14, 16, 18, and 20), measured by a Knudsen effusion method combined with a quartz crystal microbalance. The thermodynamic properties of vaporization of the ionic liquids under study are analysed together with the results obtained previously for the shorter alkyl chain length [CN/2CN/2im][NTf2] (N = 2, 4, 6, 8, 10, and 12), in order to evaluate the effect of the alkyl side chains of the cation and to get additional insights concerning the nanostructuration of ionic liquids. The symmetry effect is explored, based on the comparison with the asymmetric imidazolium based ionic liquids, [CN-1C1im][NTf2]. A trend shift on the thermodynamic properties of vaporization along the alkyl side chains of the extended symmetric ionic liquids, around [C6C6im][NTf2], was detected. An intensification of the odd-even effect was observed starting from [C6C6im][NTf2], with higher enthalpies and entropies of vaporization for the odd numbered ionic liquids, [C7C7im][NTf2] and [C9C9im][NTf2]. Similar, but less pronounced, odd-even effect was found for the symmetric ionic liquids with lower alkyl side chains length, [CN/2CN/2im][NTf2] (with N = 4, 6, 8, 10, and 12). This effect is related with the predominant orientation of the terminal methyl group of the alkyl chain to the imidazolium ring and their influence in the cation-anion interaction. The same Critical Alkyl length at the hexyl, (C6C1and C6C6) was found for both asymmetric and symmetric series indicating that the nanostructuration of the ionic liquids is related with alkyl chain length.
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Affiliation(s)
- Marisa A A Rocha
- Centro de Investigação em Química, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal
| | - João A P Coutinho
- CICECO, Departamento de Química, Universidade de Aveiro, P-3810-193 Aveiro, Portugal
| | - Luís M N B F Santos
- Centro de Investigação em Química, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal
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13
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Hessey SG, Jones RG. Line‐of‐sight mass spectrometry: principles and practice. SURF INTERFACE ANAL 2015. [DOI: 10.1002/sia.5749] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Stephen G. Hessey
- Department of Physical Chemistry, School of ChemistryUniversity of Nottingham University Park Nottingham NG9 7AL UK
| | - Robert G. Jones
- Department of Physical Chemistry, School of ChemistryUniversity of Nottingham University Park Nottingham NG9 7AL UK
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14
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Vilas M, Rocha MAA, Fernandes AM, Tojo E, Santos LMNBF. Novel 2-alkyl-1-ethylpyridinium ionic liquids: synthesis, dissociation energies and volatility. Phys Chem Chem Phys 2015; 17:2560-72. [DOI: 10.1039/c4cp05191b] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Overlapping of the electrostatic and van der Waals functional interaction potentials.
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Affiliation(s)
- Miguel Vilas
- Department of Organic Chemistry
- University of Vigo
- Faculty of Chemistry
- Vigo
- Spain
| | - Marisa A. A. Rocha
- CIQ
- Departamento de Química e Bioquímica
- Faculdade de Ciências da Universidade do Porto
- Porto
- Portugal
| | - Ana M. Fernandes
- QOPNA Unit
- Departamento de Química
- Universidade de Aveiro
- 3810-193 Aveiro
- Portugal
| | - Emilia Tojo
- Department of Organic Chemistry
- University of Vigo
- Faculty of Chemistry
- Vigo
- Spain
| | - Luís M. N. B. F. Santos
- CIQ
- Departamento de Química e Bioquímica
- Faculdade de Ciências da Universidade do Porto
- Porto
- Portugal
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15
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Horikawa M, Akai N, Kawai A, Shibuya K. Vaporization of Protic Ionic Liquids Studied by Matrix-Isolation Fourier Transform Infrared Spectroscopy. J Phys Chem A 2014; 118:3280-7. [DOI: 10.1021/jp501784w] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Mami Horikawa
- Department
of Chemistry, Graduate School
of Science and Engineering, Tokyo Institute of Technology, 2-12-1,
Ohokayama, Meguro-ku, Tokyo, 152-8551 Japan
| | - Nobuyuki Akai
- Graduate
School of Bio-Applications and Systems Engineering (BASE), Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Akio Kawai
- Department
of Chemistry, Graduate School
of Science and Engineering, Tokyo Institute of Technology, 2-12-1,
Ohokayama, Meguro-ku, Tokyo, 152-8551 Japan
| | - Kazuhiko Shibuya
- Department
of Chemistry, Graduate School
of Science and Engineering, Tokyo Institute of Technology, 2-12-1,
Ohokayama, Meguro-ku, Tokyo, 152-8551 Japan
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16
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Rao W, Mitchell D, Licence P, Barrett DA. The use of dicationic ion-pairing compounds to enhance the ambient detection of surface lipids in positive ionization mode using desorption electrospray ionisation mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2014; 28:616-624. [PMID: 24519824 DOI: 10.1002/rcm.6826] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 01/02/2014] [Accepted: 01/04/2014] [Indexed: 06/03/2023]
Abstract
RATIONALE Lipids are typically analysed in negative ionisation mode in desorption electrospray ionisation mass spectrometry (DESI-MS), which can result in reduced sensitivity. In this study we examine the use of dicationic compounds as reactive DESI-MS agents to detect a range of lipid standards from the surface in positive ionisation mode. METHODS Nine dicationic compounds were tested for their ability to detect seven representative lipid species (palmitoleic acid, linoleic acid, phosphatidic acid (34:1), phosphoethanolamine (34:2), phosphatidylglycerol (34:1), phosphatidylserine (36:1), and phosphoinositol (34:2)) with a 2D DESI source on hydrophobic surfaces. Two different solvent systems (methanol/chloroform (1:1) and methanol) were tested with each dicationic compound, with the DESI-MS analysis performed in the positive ionisation mode. RESULTS Most of the dications tested were able to form stable ion-pairs with the negatively charged lipid species when analysed from the surface with DESI-MS, and were detected readily in positive ionisation electrospray mode as singly charged species. The optimal solvent system was found to be methanol. The dicationic compound [C6(C1Pyrr)2][Br]2 was found to enhance the detection of palmitoleic acid (638%), linoleic acid (304%) and phosphoethanolamine (269%) compared with the negative ionisation mode. CONCLUSIONS We demonstrate the first successful application of dicationic compounds in DESI-MS for the ambient surface detection of model lipids in positive electrospray ionisation mode. Dicationic compounds could potentially be used as reactive DESI-MS agents to improve the ambient detection of a number of negatively charged analytes.
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Affiliation(s)
- Wei Rao
- Centre for Analytical Bioscience, School of Pharmacy, University of Nottingham, Nottingham, NG7 2RD, UK
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17
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Lovelock KRJ, Armstrong JP, Licence P, Jones RG. Vaporisation and thermal decomposition of dialkylimidazolium halide ion ionic liquids. Phys Chem Chem Phys 2014; 16:1339-53. [DOI: 10.1039/c3cp52950a] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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18
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Gas phase electronic absorption spectroscopy of room temperature ionic liquids: N-Ethyl-3-methylpyridinium or 1-butyl-3-methylimidazolium cation with bis(trifluoromethylsulfonyl)amido anion. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2012.10.075] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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Neto BAD, Meurer EC, Galaverna R, Bythell BJ, Dupont J, Cooks RG, Eberlin MN. Vapors from Ionic Liquids: Reconciling Simulations with Mass Spectrometric Data. J Phys Chem Lett 2012; 3:3435-41. [PMID: 26290969 DOI: 10.1021/jz301608c] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The species involved in the distillation of aprotic ionic liquids are discussed in light of recent simulations and mass spectrometric data obtained by various techniques. New mass spectrometric data collected via laser-induced acoustic desorption and the thermal desorption of ionic liquids are also presented as well as additional DFT calculations. The available evidence of theoretical simulations and mass spectrometric data suggests that the distillation of ionic liquids occurs mainly via neutral ion pairs of composition CnAn [C(+) = cation and A(-) = anion], followed by gas-phase dissociation to lower order ion pairs and then dissociation of hot CA to C(+) and A(-), followed by ion/molecule association events to give [CnAn-1](+) or [Cn-1An](-) ions to a degree that depends on the amount of internal energy deposited into the neutral CnAn clusters upon evaporation.
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Affiliation(s)
- Brenno A D Neto
- †Laboratory of Medicinal and Technological Chemistry, University of Brasília, Institute of Chemistry, Brasília, DF 70904-970, Brazil
| | - Eduardo C Meurer
- ‡ThoMSon Mass Spectrometry Laboratory, Institute of Chemistry, University of Campinas, Campinas, SP 13085-970 Brazil
| | - Renan Galaverna
- ‡ThoMSon Mass Spectrometry Laboratory, Institute of Chemistry, University of Campinas, Campinas, SP 13085-970 Brazil
| | - Benjamin J Bythell
- §National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Jairton Dupont
- ∥Institute of Chemistry, Federal University of Rio Grande do Sul, Porto Alegre, RS 91501-970, Brazil
| | - R Graham Cooks
- ⊥Aston Laboratory for Mass Spectrometry, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Marcos N Eberlin
- ‡ThoMSon Mass Spectrometry Laboratory, Institute of Chemistry, University of Campinas, Campinas, SP 13085-970 Brazil
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Yeganegi S, Soltanabadi A, Farmanzadeh D. Molecular dynamic simulation of dicationic ionic liquids: effects of anions and alkyl chain length on liquid structure and diffusion. J Phys Chem B 2012; 116:11517-26. [PMID: 22897217 DOI: 10.1021/jp3059933] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Structures and dynamics of nine geminal dicationic ionic liquids (DILs) Cn(mim)2X2, where n = 3, 6, and 9 and X = PF6(-), BF4(-), and Br(-), were studied by molecular dynamic simulations (J. Phys. Chem.B2004, 108, 2038-2047). A force field with a minor modification for C3(mim)2 × 2 was adopted for the simulations. Densities, detailed microscopic structures, mean-square displacements (MSD), and self-diffusivities for various ion pairs from MD simulations have been presented. The calculated densities for C9(mim)2X2 (X = Br(-) and BF4(-)) agreed well with the experimental values. The calculated RDFs show that anions are well organized around the imidazolium rings. The calculated RDFs indicate that, unlike the mono cationic ILs, the anions and cations in DILs distribute homogeneously. Enthalpies of vaporization were calculated and correlated with the structural features of DILs. The local structure of C9(mim)2X2 (X = Br, PF6) was examined by the spatial distribution function (SDF). The calculated SDFs show that similar trends were found by other groups for mono cationic ionic liquids (ILs). The highest probability densities are located around the imidazolium ring hydrogens. The calculated diffusion coefficients show that the ion diffusivities are 1 order of magnitude smaller than that of the mono cationic ionic liquids. The effects of alkyl chain length and anion type on the diffusion coefficient were also studied. The dynamics of the imidazolium rings and the alkyl chain in different time scales have also discussed. The calculated transference numbers show that the anions have the major role in carrying the electric current in a DIL.
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Affiliation(s)
- Saeid Yeganegi
- Department of Physical Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar, Iran.
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21
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Koh CJ, Leone SR. Simultaneous ion-pair photodissociation and dissociative ionization of an ionic liquid: velocity map imaging of vacuum-ultraviolet-excited 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. Mol Phys 2012. [DOI: 10.1080/00268976.2012.673019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Abstract
A comprehensive description of room-temperature ionic liquids (RTILs) requires characterization of their properties around normal boiling and critical. Using a thoroughly parametrized force field, we report atomistic simulations of the vapor phase of N-butylpyridinium tetrafluoroborate and 1-ethyl-3-methylimidazolium bis(trifluoromethanesulphonyl)amide, existing in equilibrium with the liquid phase. We show that in contrast to traditional gases comprised of one type of molecules, the saturated vapor of RTILs consists of a broad range of structures, involving both neutral and charged species. While typically the ionic pair is the most stable vapor structure, the species distribution depends on RTIL chemical composition and is sensitive to temperature and pressure.
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Affiliation(s)
- Vitaly V Chaban
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Oleg V Prezhdo
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
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23
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Deyko A, Hessey SG, Licence P, Chernikova EA, Krasovskiy VG, Kustov LM, Jones RG. The enthalpies of vaporisation of ionic liquids: new measurements and predictions. Phys Chem Chem Phys 2012; 14:3181-93. [PMID: 22286312 DOI: 10.1039/c2cp23705a] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The enthalpies of vaporisation, Δ(vap)H(298), of seven ionic liquids (ILs) (four imidazoliums, a pyridinium, a phosphonium and an isouronium) have been determined by temperature programmed desorption using line of sight mass spectrometry. They were: 1-ethyl-3-methylimidazolium bis(pentafluoroethyl)phosphinate, [C(2)C(1)Im][PO(2)(C(2)F(5))(2)]; 1-butyl-3-methylimidazolium octylsulfate, [C(4)C(1)Im][C(8)OSO(3)]; 1-butyl-3-methylimidazolium tetrafluoroborate, [C(4)C(1)Im][BF(4)]; 1-hexyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate, [C(6)C(1)Im][FAP]; 1-butylpyridinium methylsulfate, [C(4)Py][C(1)OSO(3)]; trihexyl(tetradecyl)phosphonium tetrafluoroborate, [P(6,6,6,14)][BF(4)] and O-ethyl-N,N,N',N'-tetramethylisouronium trifluoromethanesulfonate, [C(2)(C(1))(4)iU][TfO]. The values were found to be consistent with a previously proposed, predictive, model in which Δ(vap)H(298) is decomposed into a Coulombic component (computable from the IL density) and van der Waals components from the anion and cation. Two previously predicted values of Δ(vap)H(298) were found to be within 6 kJ mol(-1) of the measured experimental values. Values for the van der Waals components are tabulated for eleven cations and twelve anions. Predictions are made for Δ(vap)H(298) for 13 ILs with as yet unmeasured Δ(vap)H(298) values (using experimental molar volumes), and for a further 44 ILs using estimated molar volumes.
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Affiliation(s)
- Alexey Deyko
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK
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24
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Vitorino J, Bernardes CES, Minas da Piedade ME. A general strategy for the experimental study of the thermochemistry of protic ionic liquids: enthalpy of formation and vaporisation of 1-methylimidazolium ethanoate. Phys Chem Chem Phys 2012; 14:4440-6. [DOI: 10.1039/c2cp40213k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Rai N, Maginn EJ. Critical behaviour and vapour-liquid coexistence of 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ionic liquidsvia Monte Carlo simulations. Faraday Discuss 2012; 154:53-69; discussion 81-96, 465-71. [DOI: 10.1039/c1fd00090j] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Preiss UP, Beichel W, Erle AMT, Paulechka YU, Krossing I. Is universal, simple melting point prediction possible? Chemphyschem 2011; 12:2959-72. [PMID: 21956860 DOI: 10.1002/cphc.201100522] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2011] [Indexed: 11/10/2022]
Abstract
An investigation of the melting points of 520 organic 1:1 salts is presented with the aim of developing a universal, simple, physically well-founded prediction scheme. The general reliability and reproducibility of the recorded experimental data are discussed with respect to purity, phase behavior, disorder and thermal history of a given substance. Additionally, mistakes, systematic errors, or lack of conventions can lead to considerable differences in the experimental measurements. A rough error bar for the reproducibility of the melting points of organic salts of ±5 to ±15 °C can be assigned. With this restraint, we developed two simple, semiempirical, five- and nine-parameter schemes with easy-to-calculate quantities. With these, we could predict the melting temperature of a given organic salt in the temperature range of -25 to +300 °C with an average error of 33.5 °C and a relative error of 9.3%. All calculated quantities are assessed with the help of conventional DFT, COSMO and COSMO-RS calculations, and are currently implemented into the IL-Prop module of the upcoming version of COSMOtherm. These prediction schemes are suitable for high-throughput computational screening of substances in the context of "computer-aided synthesis". Therefore, they are valuable tools to find a compound with a suitable melting point before its first synthesis.
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Affiliation(s)
- Ulrich P Preiss
- Freiburger Materialforschungszentrum (FMF), Universität Freiburg, Stefan-Meier-Str. 21, 79104 Freiburg, Germany
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27
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Bhargava BL, Klein ML. Nanoscale Organization in Aqueous Dicationic Ionic Liquid Solutions. J Phys Chem B 2011; 115:10439-46. [DOI: 10.1021/jp204413n] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- B. L. Bhargava
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, 1900 N. 12th Street, Philadelphia, Pennsylvania 19122, United States
- The Laboratory for Research on the Structure of Matter, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104-6202, United States
| | - Michael L. Klein
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, 1900 N. 12th Street, Philadelphia, Pennsylvania 19122, United States
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28
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Koh CJ, Liu CL, Harmon CW, Strasser D, Golan A, Kostko O, Chambreau SD, Vaghjiani GL, Leone SR. Soft Ionization of Thermally Evaporated Hypergolic Ionic Liquid Aerosols. J Phys Chem A 2011; 115:4630-5. [DOI: 10.1021/jp200633b] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christine J. Koh
- Departments of Chemistry and Physics, University of California, Berkeley, California 94720, United States
| | - Chen-Lin Liu
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Christopher W. Harmon
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Daniel Strasser
- Departments of Chemistry and Physics, University of California, Berkeley, California 94720, United States
| | - Amir Golan
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Oleg Kostko
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | | | | | - Stephen R. Leone
- Departments of Chemistry and Physics, University of California, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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29
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Taylor AW, Lovelock KRJ, Jones RG, Licence P. Borane-substituted imidazol-2-ylidenes: syntheses in vacuo. Dalton Trans 2011; 40:1463-70. [DOI: 10.1039/c0dt01240h] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Deyko A, Lovelock KRJ, Licence P, Jones RG. The vapour of imidazolium-based ionic liquids: a mass spectrometry study. Phys Chem Chem Phys 2011; 13:16841-50. [DOI: 10.1039/c1cp21821b] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Vitorino J, Leal JP, Licence P, Lovelock KRJ, Gooden PN, Minas da Piedade ME, Shimizu K, Rebelo LPN, Canongia Lopes JN. Vaporisation of a Dicationic Ionic Liquid Revisited. Chemphyschem 2010; 11:3673-7. [DOI: 10.1002/cphc.201000723] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Joana Vitorino
- Departamento de Química e Bioquímica/FCUL, 1649‐016 Lisboa (Portugal)
- Unidade de Ciências Químicas e Radiofarmacêuticas/ITN, 2686‐953, Sacavém (Portugal)
| | - João P. Leal
- Departamento de Química e Bioquímica/FCUL, 1649‐016 Lisboa (Portugal)
- Unidade de Ciências Químicas e Radiofarmacêuticas/ITN, 2686‐953, Sacavém (Portugal)
| | - Peter Licence
- School of Chemistry, University of Nottingham, Nottingham, NG7 2RD (UK)
| | | | - Peter N. Gooden
- School of Chemistry, University of Nottingham, Nottingham, NG7 2RD (UK)
| | | | - Karina Shimizu
- Centro de Química Estrutural/IST, Av. Rovisco Pais 1049 001 Lisboa (Portugal), Fax: (+351) 218 464 455 http://cqe.ist.utl.pt
| | - Luís P. N. Rebelo
- Instituto de Tecnologia Química e Biológica/UNL, Av. República, Apartado 127, 2780 901 Oeiras (Portugal) http://www.itqb.unl.pt
| | - José N. Canongia Lopes
- Centro de Química Estrutural/IST, Av. Rovisco Pais 1049 001 Lisboa (Portugal), Fax: (+351) 218 464 455 http://cqe.ist.utl.pt
- Instituto de Tecnologia Química e Biológica/UNL, Av. República, Apartado 127, 2780 901 Oeiras (Portugal) http://www.itqb.unl.pt
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32
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Preiss U, Bulut S, Krossing I. In Silico Prediction of the Melting Points of Ionic Liquids from Thermodynamic Considerations: A Case Study on 67 Salts with a Melting Point Range of 337 °C. J Phys Chem B 2010; 114:11133-40. [DOI: 10.1021/jp104679m] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ulrich Preiss
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Albert-Ludwigs Universität Freiburg, Albertstrasse 21, 79104 Freiburg, Germany
| | - Safak Bulut
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Albert-Ludwigs Universität Freiburg, Albertstrasse 21, 79104 Freiburg, Germany
| | - Ingo Krossing
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Albert-Ludwigs Universität Freiburg, Albertstrasse 21, 79104 Freiburg, Germany
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33
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Schröder D, Ducháčková L, Jušinski I, Eckert-Maksić M, Heyda J, Tůma L, Jungwirth P. Characterization of the triple ion [ (CH3)4N+·PF6-·(CH3)4N+] in the gas-phase. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.03.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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34
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Torimoto T, Tsuda T, Okazaki KI, Kuwabata S. New frontiers in materials science opened by ionic liquids. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2010; 22:1196-1221. [PMID: 20437507 DOI: 10.1002/adma.200902184] [Citation(s) in RCA: 470] [Impact Index Per Article: 33.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Ionic liquids (ILs) including ambient-temperature molten salts, which exist in the liquid state even at room temperature, have a long research history. However, their applications were once limited because ILs were considered as highly moisture-sensitive solvents that should be handled in a glove box. After the first synthesis of moisture-stable ILs in 1992, their unique physicochemical properties became known in all scientific fields. ILs are composed solely of ions and exhibit several specific liquid-like properties, e.g., some ILs enable dissolution of insoluble bio-related materials and the use as tailor-made lubricants in industrial applications under extreme physicochemical conditions. Hybridization of ILs and other materials provides quasi-solid materials, which can be used to fabricate highly functional devices. ILs are also used as reaction media for electrochemical and chemical synthesis of nanomaterials. In addition, the negligible vapor pressure of ILs allows the fabrication of electrochemical devices that are operated under ambient conditions, and many liquid-vacuum technologies, such as X-ray photoelectron spectroscopy (XPS) analysis of liquids, electron microscopy of liquids, and sputtering and physical vapor deposition onto liquids. In this article, we review recent studies on ILs that are employed as functional advanced materials, advanced mediums for materials production, and components for preparing highly functional materials.
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Affiliation(s)
- Tsukasa Torimoto
- Japan Science and Technology Agency, CREST Kawaguchi, Saitama 332-0012, Japan.
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35
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Bhargava BL, Klein ML. Formation of Interconnected Aggregates in Aqueous Dicationic Ionic Liquid Solutions. J Chem Theory Comput 2010; 6:873-9. [DOI: 10.1021/ct900674t] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- B. L. Bhargava
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, 1900 N. 12th Street, Philadelphia, Pennsylvania 19122, and The Laboratory for Research on the Structure of Matter, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104-6202
| | - Michael L. Klein
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, 1900 N. 12th Street, Philadelphia, Pennsylvania 19122, and The Laboratory for Research on the Structure of Matter, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104-6202
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36
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Chambreau SD, Vaghjiani GL, To A, Koh C, Strasser D, Kostko O, Leone SR. Heats of Vaporization of Room Temperature Ionic Liquids by Tunable Vacuum Ultraviolet Photoionization. J Phys Chem B 2010; 114:1361-7. [DOI: 10.1021/jp909423m] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Steven D. Chambreau
- ERC, Incorporated, Edwards Air Force Base, California 93524, Air Force Research Laboratory, Edwards Air Force Base, California 93524, Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, Departments of Chemistry and Physics and Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
| | - Ghanshyam L. Vaghjiani
- ERC, Incorporated, Edwards Air Force Base, California 93524, Air Force Research Laboratory, Edwards Air Force Base, California 93524, Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, Departments of Chemistry and Physics and Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
| | - Albert To
- ERC, Incorporated, Edwards Air Force Base, California 93524, Air Force Research Laboratory, Edwards Air Force Base, California 93524, Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, Departments of Chemistry and Physics and Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
| | - Christine Koh
- ERC, Incorporated, Edwards Air Force Base, California 93524, Air Force Research Laboratory, Edwards Air Force Base, California 93524, Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, Departments of Chemistry and Physics and Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
| | - Daniel Strasser
- ERC, Incorporated, Edwards Air Force Base, California 93524, Air Force Research Laboratory, Edwards Air Force Base, California 93524, Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, Departments of Chemistry and Physics and Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
| | - Oleg Kostko
- ERC, Incorporated, Edwards Air Force Base, California 93524, Air Force Research Laboratory, Edwards Air Force Base, California 93524, Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, Departments of Chemistry and Physics and Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
| | - Stephen R. Leone
- ERC, Incorporated, Edwards Air Force Base, California 93524, Air Force Research Laboratory, Edwards Air Force Base, California 93524, Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, Departments of Chemistry and Physics and Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720
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37
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Qiu F, Taylor AW, Men S, Villar-Garcia IJ, Licence P. An ultra high vacuum-spectroelectrochemical study of the dissolution of copper in the ionic liquid (N-methylacetate)-4-picolinium bis(trifluoromethylsulfonyl)imide. Phys Chem Chem Phys 2010; 12:1982-90. [DOI: 10.1039/b924985k] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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38
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Taylor AW, Lovelock KRJ, Deyko A, Licence P, Jones RG. High vacuum distillation of ionic liquids and separation of ionic liquid mixtures. Phys Chem Chem Phys 2010; 12:1772-83. [DOI: 10.1039/b920931j] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Lovelock KRJ, Deyko A, Licence P, Jones RG. Vaporisation of an ionic liquid near room temperature. Phys Chem Chem Phys 2010; 12:8893-901. [DOI: 10.1039/c004197a] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Strasser D, Goulay F, Belau L, Kostko O, Koh C, Chambreau SD, Vaghjiani GL, Ahmed M, Leone SR. Tunable Wavelength Soft Photoionization of Ionic Liquid Vapors. J Phys Chem A 2009; 114:879-83. [DOI: 10.1021/jp909727f] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Daniel Strasser
- Departments of Chemistry and Physics, University of California, Berkeley, California 94720, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, ERC Incorporated and Air Force Research Laboratory, Edwards Air Force Base, California 93524
| | - Fabien Goulay
- Departments of Chemistry and Physics, University of California, Berkeley, California 94720, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, ERC Incorporated and Air Force Research Laboratory, Edwards Air Force Base, California 93524
| | - Leonid Belau
- Departments of Chemistry and Physics, University of California, Berkeley, California 94720, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, ERC Incorporated and Air Force Research Laboratory, Edwards Air Force Base, California 93524
| | - Oleg Kostko
- Departments of Chemistry and Physics, University of California, Berkeley, California 94720, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, ERC Incorporated and Air Force Research Laboratory, Edwards Air Force Base, California 93524
| | - Christine Koh
- Departments of Chemistry and Physics, University of California, Berkeley, California 94720, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, ERC Incorporated and Air Force Research Laboratory, Edwards Air Force Base, California 93524
| | - Steven D. Chambreau
- Departments of Chemistry and Physics, University of California, Berkeley, California 94720, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, ERC Incorporated and Air Force Research Laboratory, Edwards Air Force Base, California 93524
| | - Ghanshyam L. Vaghjiani
- Departments of Chemistry and Physics, University of California, Berkeley, California 94720, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, ERC Incorporated and Air Force Research Laboratory, Edwards Air Force Base, California 93524
| | - Musahid Ahmed
- Departments of Chemistry and Physics, University of California, Berkeley, California 94720, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, ERC Incorporated and Air Force Research Laboratory, Edwards Air Force Base, California 93524
| | - Stephen R. Leone
- Departments of Chemistry and Physics, University of California, Berkeley, California 94720, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, ERC Incorporated and Air Force Research Laboratory, Edwards Air Force Base, California 93524
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41
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Deyko A, Lovelock KRJ, Corfield JA, Taylor AW, Gooden PN, Villar-Garcia IJ, Licence P, Jones RG, Krasovskiy VG, Chernikova EA, Kustov LM. Measuring and predicting ΔvapH298 values of ionic liquids. Phys Chem Chem Phys 2009; 11:8544-55. [DOI: 10.1039/b908209c] [Citation(s) in RCA: 146] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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