1
|
Silva GM, Beira MJ, Morgado P, Branco LC, Sebastião PJ, Canongia Lopes JN, Filipe EJ. Ionic liquids with hydrogenated and perfluorinated chains: Structural study of the [P6,6,6,14][FnCOO] n = 7, 9, 11. Checking the existence of polar – hydrogenated – perfluorinated triphilic continuity. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
2
|
Langtry AE, Thompson KB, Redeker ND, Quintana AS, Bui DL, Greeson KT, Cena N, Marcischak JC, M. J. Moore L, Ghiassi KB. Fluorinated phosphonium salts and ionic liquids prepared via thiol-ene click chemistry: a physical and thermal property study. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
3
|
Curnow OJ, Senthooran R. Highly-fluorinated Triaminocyclopropenium Ionic Liquids. Chem Asian J 2022; 17:e202200139. [PMID: 35239986 PMCID: PMC9314049 DOI: 10.1002/asia.202200139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 03/02/2022] [Indexed: 11/27/2022]
Abstract
A series of highly-fluorinated triaminocyclopropenium salts, with up to six fluorous groups, were prepared and their properties as ionic liquids investigated. Reaction of pentachlorocyclopropane or tetrachlorocyclopropene with bis(2,2,2-trifluoroethyl)amine, HN(CH2 CF3 )2 , occurs in the presence of a trialkylamine, NR3 , to give cations with two fluorinated amino groups, [C3 (N(CH2 CF3 )2 )2 (NR2 )]+ (R=Et, Pr, Bu, Hex), with traces of [C3 (N(CH2 CF3 )2 )3 ]+ . Use of appropriate reagent ratios and reaction times and subsequent addition of a dialkylamine, HNR'R", gives cations with one fluorinated amino group, [C3 (N(CH2 CF3 )2 )(NR2 )(NR'R")]+ ((NR2 )(NR'R")=(NBu2 )2 , (NEt2 )(NPr2 ), (NBu2 )(NBuMe)). These cations were isolated as chloride salts and some of these were converted to bistriflamide, dicyanamide and triflate salts to provide ionic liquids. These salts were characterised by thermal (DSC and TGA) measurements and miscibility/solubility properties (determined in a range of solvents). Ionic liquids (ILs) were also characterised by density, viscosity and conductivity measurements where possible. X-ray diffraction studies of chloride salts showed the formation of fluorous regions and more hydrophilic ionic regions in the solid state.
Collapse
Affiliation(s)
- Owen J. Curnow
- School of Physical and Chemical SciencesUniversity of CanterburyPrivate Bag 4800Christchurch8140New Zealand
| | - Rathiga Senthooran
- School of Physical and Chemical SciencesUniversity of CanterburyPrivate Bag 4800Christchurch8140New Zealand
| |
Collapse
|
4
|
Zhang P, Zou R, Wu S, Meyer LA, Wang J, Kraus T. Gold Nanoprobes Exploring the Ice Structure in the Aqueous Dispersion of Poly(Ethylene Glycol)-Gold Hybrid Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:2460-2466. [PMID: 35167305 DOI: 10.1021/acs.langmuir.1c02783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Ice structures and their formation process are fundamentally important to cryobiology, geoscience, and physical chemistry. In this work, we synthesized gold nanoprobes by grafting water-soluble polyethylene glycol (PEG) onto spherical gold nanoparticles and analyzed the structure of ice formation in the vicinity of the resulting hybrid PEG-Au nanoparticles (AuPEGNPs). Temperature-dependent in situ small-angle X-ray scattering (SAXS) indicated that AuPEGNPs, like PEG, caused the formation of bulk spherulite ice. Unlike for PEG, we observed the formation of lamellar ice with a periodicty of 4.6 nm, which is thermodynamically less stable than the bulk form. The lamellar ice formed after AuPEGNP agglomeration during cooling at -19 °C, and it remained during subsequent heating from -20 to -11 °C and melted at around -10 °C, far below the melting temperature of bulk ice. We explain different effects of AuPEGNP and free PEG on ice formation by the topological differences. The highly concentrated PEG chains on the agglomerated Au cores lead to the formation of PEG-hydrates that assemble into lamellar ice with a periodicity of 4.6 nm.
Collapse
Affiliation(s)
- Peng Zhang
- State Key Laboratory of Optoelectronic Materials and Technologies, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Ruike Zou
- State Key Laboratory of Optoelectronic Materials and Technologies, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Shuwang Wu
- Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Lars-Arne Meyer
- INM-Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
| | - Jianjun Wang
- Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Tobias Kraus
- INM-Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
- Colloid and Interface Chemistry, Saarland University, Campus D2 2, 66123 Saarbrücken, Germany
| |
Collapse
|
5
|
Bernardino K, Ribeiro MCC. Role of density and electrostatic interactions in the viscosity and non-newtonian behavior of ionic liquids – a molecular dynamics study. Phys Chem Chem Phys 2022; 24:6866-6879. [DOI: 10.1039/d1cp05692a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Both viscosity and the shear-thinning of ionic liquids are determined mainly by ionic interaction, with density having a secondary effect.
Collapse
Affiliation(s)
- Kalil Bernardino
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, 05508-000, Brazil
| | - Mauro C. C. Ribeiro
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, 05508-000, Brazil
| |
Collapse
|
6
|
Rauber D, Philippi F, Kuttich B, Becker J, Kraus T, Hunt P, Welton T, Hempelmann R, Kay CWM. Curled cation structures accelerate the dynamics of ionic liquids. Phys Chem Chem Phys 2021; 23:21042-21064. [PMID: 34522943 DOI: 10.1039/d1cp02889h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ionic liquids are modern liquid materials with potential and actual implementation in many advanced technologies. They combine many favourable and modifiable properties but have a major inherent drawback compared to molecular liquids - slower dynamics. In previous studies we found that the dynamics of ionic liquids are significantly accelerated by the introduction of multiple ether side chains into the cations. However, the origin of the improved transport properties, whether as a result of the altered cation conformation or due to the absence of nanostructuring within the liquid as a result of the higher polarity of the ether chains, remained to be clarified. Therefore, we prepared two novel sets of methylammonium based ionic liquids; one set with three ether substituents and another set with three butyl side chains, in order to compare their dynamic properties and liquid structures. Using a range of anions, we show that the dynamics of the ether-substituted cations are systematically and distinctly accelerated. Liquefaction temperatures are lowered and fragilities increased, while at the same time cation-anion distances are slightly larger for the alkylated samples. Furthermore, pronounced liquid nanostructures were not observed. Molecular dynamics simulations demonstrate that the origin of the altered properties of the ether substituted ionic liquids is primarily due to a curled ether chain conformation, in contrast to the alkylated cations where the alkyl chains retain a linear conformation. Thus, the observed structure-property relations can be explained by changes in the geometric shape of the cations, rather than by the absence of a liquid nanostructure. Application of quantum chemical calculations to a simplified model system revealed that intramolecular hydrogen-bonding is responsible for approximately half of the stabilisation of the curled ether-cations, whereas the other half stems from non-specific long-range interactions. These findings give more detailed insights into the structure-property relations of ionic liquids and will guide the development of ionic liquids that do not suffer from slow dynamics.
Collapse
Affiliation(s)
- Daniel Rauber
- Department of Chemistry, Saarland University, Campus B2.2, 66123, Saarbrücken, Germany.
| | - Frederik Philippi
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, London W12 0BZ, UK
| | - Björn Kuttich
- INM-Leibniz Institute for New Materials, Campus D2.2, 66123, Saarbrücken, Germany
| | - Julian Becker
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, London W12 0BZ, UK
| | - Tobias Kraus
- Department of Chemistry, Saarland University, Campus B2.2, 66123, Saarbrücken, Germany. .,INM-Leibniz Institute for New Materials, Campus D2.2, 66123, Saarbrücken, Germany
| | - Patricia Hunt
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, London W12 0BZ, UK.,School of Chemical and Physical Sciences, Victoria University of Wellington, New Zealand
| | - Tom Welton
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, London W12 0BZ, UK
| | - Rolf Hempelmann
- Department of Chemistry, Saarland University, Campus B2.2, 66123, Saarbrücken, Germany.
| | - Christopher W M Kay
- Department of Chemistry, Saarland University, Campus B2.2, 66123, Saarbrücken, Germany. .,London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH, UK.
| |
Collapse
|
7
|
Wang K, Liu Y, Wang S, Dai Z, Xiong Y. Synergistic catalysis of metalloporphyrins and phosphonium ionic liquids for the efficient transformation of CO2 under ambient conditions. J CO2 UTIL 2021. [DOI: 10.1016/j.jcou.2021.101519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
8
|
Palumbo O, Trequattrini F, Cimini A, Tsurumaki A, Navarra MA, Paolone A. Inter- and Intramolecular Interactions in Ether-Functionalized Ionic Liquids. J Phys Chem B 2021; 125:2380-2388. [PMID: 33625218 DOI: 10.1021/acs.jpcb.0c11429] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The intra- and intermolecular interactions in ether-functionalized ionic liquids (ILs) are studied by means of infrared (IR) spectroscopy measurements of N-ethoxyethyl-N-methylpiperidiniumbis(fluorosulfonyl)imide (P1,2O2-FSI) and N-ethoxyethyl-N-methylmorpholiniumbis(fluorosulfonyl)imide (M1,2O2-FSI). The temperature dependence of the spectra in the medium IR range allows the study of the anion conformer distribution and its variation during phase transitions. In particular, it is found that for both ILs the trans conformer of FSI is more stable than the cis conformer, and the enthalpy differences between them are calculated and are found to decrease upon the addition of a Li salt. The results obtained in the far IR range, combined with ab initio calculation of the ionic couple performed using the B3LYP-D functional and considering both empirical dispersion corrections and the presence of a polar solvent, provide evidence for the occurrence of a hydrogen bonding between the O atom of the anion and its closest H atoms directly linked to a C atom of the cation. The comparison with samples having the same cations but with bis(trifluoromethanesulfonyl)imide (TFSI) as an anion, that is, M1,2O2-TFSI and P1,2O2-TFSI, as well as with samples having cations without the ether-functionalization neither in the ring nor in the side chain, such as N-propyl-N-methylpyrrolidinium-FSI (PYR13-FSI) and 1-butyl-1-methylpyrrolidinium-TFSI (PYR14-TFSI), indicates that the occurrence of such highly directional interaction between anion and cation is better observable in the ether-functionalized samples, in particular in those containing FSI as an anion.
Collapse
Affiliation(s)
- O Palumbo
- CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy
| | - F Trequattrini
- CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy.,Department of Physics, University of Rome "La Sapienza", Piazzale A. Moro 5, 00185 Rome, Italy
| | - A Cimini
- CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy
| | - A Tsurumaki
- Department of Chemistry, University of Rome "La Sapienza", Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - M A Navarra
- Department of Chemistry, University of Rome "La Sapienza", Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - A Paolone
- CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy
| |
Collapse
|
9
|
Lundin F, Hansen HW, Adrjanowicz K, Frick B, Rauber D, Hempelmann R, Shebanova O, Niss K, Matic A. Pressure and Temperature Dependence of Local Structure and Dynamics in an Ionic Liquid. J Phys Chem B 2021; 125:2719-2728. [PMID: 33656344 PMCID: PMC8034775 DOI: 10.1021/acs.jpcb.1c00147] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
![]()
A detailed understanding
of the local dynamics in ionic liquids
remains an important aspect in the design of new ionic liquids as
advanced functional fluids. Here, we use small-angle X-ray scattering
and quasi-elastic neutron spectroscopy to investigate the local structure
and dynamics in a model ionic liquid as a function of temperature
and pressure, with a particular focus on state points (P,T) where the macroscopic dynamics, i.e., conductivity,
is the same. Our results suggest that the initial step of ion transport
is a confined diffusion process, on the nanosecond timescale, where
the motion is restricted by a cage of nearest neighbors. This process
is invariant considering timescale, geometry, and the participation
ratio, at state points of constant conductivity, i.e., state points
of isoconductivity. The connection to the nearest-neighbor structure
is underlined by the invariance of the peak in the structure factor
corresponding to nearest-neighbor correlations. At shorter timescales,
picoseconds, two localized relaxation processes of the cation can
be observed, which are not directly linked to ion transport. However,
these processes also show invariance at isoconductivity. This points
to that the overall energy landscape in ionic liquids responds in
the same way to density changes and is mainly governed by the nearest-neighbor
interactions.
Collapse
Affiliation(s)
- Filippa Lundin
- Department of Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Henriette Wase Hansen
- Department of Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden.,Glass and Time, IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark.,Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | - Karolina Adrjanowicz
- Insitute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
| | - Bernhard Frick
- Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | - Daniel Rauber
- Department of Chemistry, Saarland University, 66123 Saarbrücken, Germany
| | - Rolf Hempelmann
- Department of Chemistry, Saarland University, 66123 Saarbrücken, Germany
| | | | - Kristine Niss
- Glass and Time, IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
| | - Aleksandar Matic
- Department of Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| |
Collapse
|
10
|
Philippi F, Pugh D, Rauber D, Welton T, Hunt PA. Conformational design concepts for anions in ionic liquids. Chem Sci 2020; 11:6405-6422. [PMID: 35432848 PMCID: PMC8959527 DOI: 10.1039/d0sc01379j] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 05/14/2020] [Indexed: 11/21/2022] Open
Abstract
The identification of specific design concepts for the in silico design of ionic liquids (ILs) has been accomplished using theoretical methods. Molecular building blocks, such as interchangeable functional groups, are used to design a priori new ILs which have subsequently been experimentally investigated. The conformational design concepts are developed by separately and systematically changing the central (imide), bridging (sulfonyl) and end (trifluoromethyl) group of the bis(trifluoromethanesulfonyl)imide [N(Tf)2]- anion and examining the resultant potential energy surfaces. It is shown that these design concepts can be used to tune separately the minimum energy geometry, transition state barrier height and relative stability of different conformers. The insights obtained have been used to design two novel anions for ILs, trifluoroacetyl(methylsulfonyl)imide [N(Ms)(TFA)]- and acetyl(trifluoromethanesulfonyl)imide [N(Tf)(Ac)]-. The computationally predicted structures show excellent agreement with experimental structures obtained from X-ray crystallography. [C4C1im][N(Tf)(Ac)] and [C4C1im][N(Ms)(TFA)] ILs have been synthesised and ion diffusion coefficients examined using pulsed field gradient stimulated echo NMR spectroscopy. Significantly increased diffusion was observed for the more flexible [N(Tf)(Ac)]- compared with the more rigid [N(Ms)(TFA)]- analogue. Furthermore, a pronounced impact on the fluidity was observed. The viscosity of the IL with the rigid anion was found to be twice as high as the viscosity of the IL with the flexible anion. The design concepts presented in this work will enable researchers in academia and industry to tailor anions to provide ILs with specific desired properties.
Collapse
Affiliation(s)
- Frederik Philippi
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London White City Campus London W12 0BZ UK
| | - David Pugh
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London White City Campus London W12 0BZ UK
- Department of Chemistry Britannia House, 7 Trinity Street London SE1 1DB UK
| | - Daniel Rauber
- Department of Chemistry, Saarland University Saarbrücken 66123 Germany
| | - Tom Welton
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London White City Campus London W12 0BZ UK
| | - Patricia A Hunt
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London White City Campus London W12 0BZ UK
- School of Chemical and Physical Sciences, Victoria University of Wellington New Zealand
| |
Collapse
|
11
|
Lo Celso F, Appetecchi GB, Simonetti E, Zhao M, Castner EW, Keiderling U, Gontrani L, Triolo A, Russina O. Microscopic Structural and Dynamic Features in Triphilic Room Temperature Ionic Liquids. Front Chem 2019; 7:285. [PMID: 31119123 PMCID: PMC6507529 DOI: 10.3389/fchem.2019.00285] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 04/08/2019] [Indexed: 01/20/2023] Open
Abstract
Here we report a thorough investigation of the microscopic and mesoscopic structural organization in a series of triphilic fluorinated room temperature ionic liquids, namely [1-alkyl,3-methylimidazolium][(trifluoromethanesulfonyl)(nonafluorobutylsulfonyl)imide], with alkyl = ethyl, butyl, octyl ([Cnmim][IM14], n = 2, 4, 8), based on the synergic exploitation of X-ray and Neutron Scattering and Molecular Dynamics simulations. This study reveals the strong complementarity between X-ray/neutron scattering in detecting the complex segregated morphology in these systems at mesoscopic spatial scales. The use of MD simulations delivering a very good agreement with experimental data allows us to gain a robust understanding of the segregated morphology. The structural scenario is completed with determination of dynamic properties accessing the diffusive behavior and a relaxation map is provided for [C2mim][IM14] and [C8mim][IM14], highlighting their natures as fragile glass formers.
Collapse
Affiliation(s)
- Fabrizio Lo Celso
- Dipartimento di Fisica e Chimica, Università di Palermo, Palermo, Italy
| | | | | | - Man Zhao
- Department of Chemistry and Chemical Biology, Rutgers University, The State University of New Jersey, Newark, NJ, United States
| | - Edward W Castner
- Department of Chemistry and Chemical Biology, Rutgers University, The State University of New Jersey, Newark, NJ, United States
| | - Uwe Keiderling
- Soft Matter and Functional Materials, Helmholtz-Zentrum für Materialien und Energie GmbH, Berlin, Germany
| | - Lorenzo Gontrani
- Department of Chemistry, University of Rome Sapienza, Rome, Italy
| | - Alessandro Triolo
- Laboratorio Liquidi Ionici, Istituto Struttura della Materia, Consiglio Nazionale delle Ricerche (ISM-CNR), Rome, Italy
| | - Olga Russina
- Department of Chemistry, University of Rome Sapienza, Rome, Italy
| |
Collapse
|
12
|
Influence of Water on Tribolayer Growth When Lubricating Steel with a Fluorinated Phosphonium Dicyanamide Ionic Liquid. LUBRICANTS 2019. [DOI: 10.3390/lubricants7030027] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This work aims to elucidate the role of environmental humidity on the tribological behavior of steel surfaces lubricated with an ionic liquid comprised of a fluorinated phosphonium cation—tributyl-3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-octyl-phosphonium—and a dicyanamide anion (i.e. N(CN)2−). Ball-on-disk tribotests were carried out at room temperature and at various levels of relative humidity (RH). Water was found to be required to promote the formation of a tribofilm over the contact area. The reaction layer exhibited a patchy morphology, which resembles that observed formed with conventional antiwear additives such as ZnDTP. A surface-chemical analysis of the tribofilm indicated that the tribofilm is composed of fluorides, oxides, and phosphates, pointing to a stress-induced degradation of the ions and corrosion of the sliding counterparts, which is enabled by the presence of water at the sliding interface.
Collapse
|
13
|
Dörr TS, Pelz A, Zhang P, Kraus T, Winter M, Wiemhöfer HD. An Ambient Temperature Electrolyte with Superior Lithium Ion Conductivity based on a Self-Assembled Block Copolymer. Chemistry 2018; 24:8061-8065. [DOI: 10.1002/chem.201801521] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Tobias S. Dörr
- INM-Leibniz Institute for New Materials; Campus D2 2 66123 Saarbrücken Germany
- Department of Materials Science and Engineering; Saarland University; Campus D2 2 66123 Saarbrücken Germany
| | - Alexander Pelz
- Helmholtz-Institute Münster; Forschungszentrum Jülich GmbH; Corrensstraße 46 48149 Münster Germany
- Institute of Inorganic and Analytical Chemistry; University of Münster; Corrensstraße 28/30 48149 Münster Germany
| | - Peng Zhang
- INM-Leibniz Institute for New Materials; Campus D2 2 66123 Saarbrücken Germany
| | - Tobias Kraus
- INM-Leibniz Institute for New Materials; Campus D2 2 66123 Saarbrücken Germany
- Colloid and Interface Chemistry; Saarland University; Campus D2 2 66123 Saarbrücken Germany
| | - Martin Winter
- Helmholtz-Institute Münster; Forschungszentrum Jülich GmbH; Corrensstraße 46 48149 Münster Germany
- MEET Battery Research Center; University of Münster; Corrensstraße 46 48149 Münster Germany
| | - Hans-Dieter Wiemhöfer
- Helmholtz-Institute Münster; Forschungszentrum Jülich GmbH; Corrensstraße 46 48149 Münster Germany
- Institute of Inorganic and Analytical Chemistry; University of Münster; Corrensstraße 28/30 48149 Münster Germany
| |
Collapse
|
14
|
Tsurumaki A, Trequattrini F, Palumbo O, Panero S, Paolone A, Navarra MA. The effect of ether-functionalisation in ionic liquids analysed by DFT calculation, infrared spectra, and Kamlet-Taft parameters. Phys Chem Chem Phys 2018; 20:7989-7997. [PMID: 29512671 DOI: 10.1039/c7cp08134k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The effect of ether-functionalisation on ionic liquids (ILs) is discussed based on Kamlet-Taft parameters and the infrared (IR) spectra of N-ethoxyethyl-N-methylpiperidinium bis(trifluoromethanesulfonyl)imide ([P1,2O2][TFSI]) and N-ethoxyethyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide ([M1,2O2][TFSI]). The results are analysed taking into consideration their ion conformers, electronegativity and hardness, and the IR active vibrations obtained by means of DFT calculations. From the evaluation of Kamlet-Taft parameters, the ether-functionalisation in the cationic ring is found to improve the polarity and hydrogen bond acidity of the ILs. This correlates with the computational result which designates that the oxygen atom in the cationic ring increases the electronegativity of the cation. The comparison with the IR spectra, which were obtained experimentally and computationally, revealed that trans-[TFSI] was preferably formed in [M1,2O2][TFSI] compared to [P1,2O2][TFSI]. Although the Kamlet-Taft parameters indicate that [M1,2O2][TFSI] has a higher polarity, this IL preferably adopts trans-[TFSI], which is normally stabilised with the cations having a lower polarity. This may be due to the presence of the oxygen in the cationic ring which delocalises the electron density of the lowest unoccupied molecular orbitals (LUMO) and increases the conformational freedom of the hydrogen bonds between cations and anions. Moreover, the mixtures of pure ILs with a suitable Li-salt were also investigated to analyze the effect of the Li salt on the polarity and the ion conformers.
Collapse
Affiliation(s)
- A Tsurumaki
- Department of Chemistry, University of Rome "La Sapienza", Piazzale Aldo Moro 5, 00185 Rome, Italy.
| | - F Trequattrini
- CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy and Department of Physics, University of Rome "La Sapienza", Piazzale A. Moro 5, 00185 Rome, Italy
| | - O Palumbo
- CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy
| | - S Panero
- Department of Chemistry, University of Rome "La Sapienza", Piazzale Aldo Moro 5, 00185 Rome, Italy.
| | - A Paolone
- CNR-ISC, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy
| | - M A Navarra
- Department of Chemistry, University of Rome "La Sapienza", Piazzale Aldo Moro 5, 00185 Rome, Italy.
| |
Collapse
|
15
|
Vanhoutte G, Hojniak SD, Bardé F, Binnemans K, Fransaer J. Fluorine-functionalized ionic liquids with high oxygen solubility. RSC Adv 2018; 8:4525-4530. [PMID: 35539533 PMCID: PMC9077791 DOI: 10.1039/c7ra13403g] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Accepted: 01/17/2018] [Indexed: 11/30/2022] Open
Abstract
Eight fluorine-functionalized ionic liquids were synthesized and the oxygen solubility was compared to commercial ionic liquids without the extra fluorinated chain. The concentration of dissolved oxygen increased with the fluorine content of the alkyl chain, which can be attached either to the cation or the anion. This approach maintains the freedom to design an ionic liquid for a specific application, while at the same time the oxygen solubility is increased. Oxygen solubility in ionic liquids is improved by increasing the number of fluorine atoms in the alkyl side chains.![]()
Collapse
Affiliation(s)
- Gijs Vanhoutte
- Department of Materials Engineering
- KU Leuven
- B-3001 Leuven
- Belgium
| | | | - Fanny Bardé
- Toyota Motor Europe
- Advanced Technology 1
- Research and Development 3
- Belgium
| | | | - Jan Fransaer
- Department of Materials Engineering
- KU Leuven
- B-3001 Leuven
- Belgium
| |
Collapse
|