178631-04-4Relevant articles and documents
Solvation structure and dynamics of Li+ in Lewis-basic ionic liquid of 1-octyl-4-aza-1-azoniabicyclo[2.2.2]octane bis(trifluoromethanesulfonyl)amide
Umecky, Tatsuya,Suga, Kenta,Masaki, Eiji,Takamuku, Toshiyuki,Makino, Takashi,Kanakubo, Mitsuhiro
, p. 557 - 562 (2015)
1H, 7Li, 13C, 15N, and 19F NMR spectra of 1-octyl-4-aza-1-azoniabicyclo[2.2.2]octane bis(trifluoromethanesulfonyl)amide ([C8dabco][TFSA]) solutions with and without LiTFSA (lithium mole fractions of xLi = 0 and 0.1) were measured at 313.2 K. The chemical shift measured for each nucleus was corrected for volume magnetic susceptibility of the solution. For comparison, those NMR spectra of 1-methyl-3-octylimidazolium bis(trifluoromethanesulfonyl)amide ([C8mim][TFSA]) solutions were recorded under the same condition. The peak shifts for the nuclei induced by the dissolution of Li+ showed that Li+ interacts with not only TFSA- but also C8dabco+ in [C8dabco][TFSA] solution. Self-diffusion coefficients of the cation, anion, and Li+ in the ionic liquid solutions were determined by a pulsed field gradient NMR technique. Correlation times for jump motion of Li+ were estimated from 7Li longitudinal relaxation times with two different magnetic fields. The diffusion and jump motions of Li+ in [C8dabco][TFSA] and [C8mim][TFSA] solutions are discussed in terms of interionic interactions.
Liquid-liquid equilibria for [C8mim][NTf2] + thiophene + 2,2,4-trimethylpentane or + toluene
Alonso, Luisa,Arce, Alberto,Francisco, Maria,Soto, Ana
, p. 1750 - 1755 (2008)
Tie-line compositions for type II systems of 1-methyl-3-octylimidazolium bis[trifluoromethylsulfonyl]imide + thiophene + 2,2,4-trimethylpentane or + toluene have been determined at 298.15 K and atmospheric pressure. Solute distribution coefficient and selectivity values have also been determined. The experimental data were correlated with the NRTL and UNIQUAC equations. The best results were found with the UNIQUAC equation. The NRTL equation could not adequately correlate the system with toluene.
Cross-linked polymer-ionic liquid composite materials
Snedden, Peter,Cooper, Andrew I.,Scott, Keith,Winterton, Neil
, p. 4549 - 4556 (2003)
A series of composites, some with permanent porosity, comprising polymers and ionic liquids have been prepared by in-situ polymerization. The characteristics of both composites and isolated polymers have been investigated. Slow mass and phase transfer characterize the interaction with a range of polymers (1-17) in the N,N′-dialkylimidazolium liquids, [emin]BF4, [bmim]PF6, or [omim]N(SO2CF3)2. Free-radical homopolymerization of 1-vinyl-2-pyrrolidinone in [bmim]PF6 or of 4-vinylpyridine in [omim]N-(SO2CF3)2 gave viscous solutions from which polymer (Mw = 162 500 and 71 500 g mol-1, respectively) could be isolated. Detectable ionic liquid residues were retained in the isolated polymers despite five reprecipitations from methanol. Copolymerization of 4-vinylpyridine (VP) with 5% divinylbenzene (DVB) or trimethylolpropane trimethacrylate (TRIM) in [omim]N(SO2CF3)2, and homopolymerizations of the cross-linking monomes on their own, led with 90-100% monomer conversion to a series of gel-like composite materials, B-H, from which gross-linked polymers, B′-H′, could be isolated by Soxhlet extraction of the ionic liquid. Copolymers of VP with 5-30% DVB (E′, F′) showed a low degree of permanent porosity in the dry state. However, poly(DVB) (G′) and poly(TRIM) (H′) have bulk densities (-3), intrusion volumes (>0.9 cm3 g-1), BET surface area (70-320 m2 g-1), and morphology (from SEM studies) which demonstrate the porogenic character of the ionic liquids used. Comparisons with the related products I and J obtained in toluene reveal the sensitivity of these systems both to the properties of the porogen solvent and to the monomer used.
Synthesis and properties of seven ionic liquids containing 1-methyl-3-octylimidazolium or 1-butyl-4-methylpyridinium cations
Papaiconomou, Nicolas,Yakelis, Neal,Salminen, Justin,Bergman, Robert,Prausnitz, John M.
, p. 1389 - 1393 (2006)
Syntheses are reported for ionic liquids containing 1-methyl-3- octylimidazolium or 1-butyl-4-methylpyridinium cations and trifluoromethyl sulfonate, dicyanamide, bis(trifluoromethylsulfonyl)imide, or nonafluorobutyl sulfonate anions. Densities, melting points, glass-transition temperatures, solubilities in water, and polarities have been measured. Ionic liquids containing pyridinium cations exhibit higher melting points, lower solubility in water, and higher polarity than those containing imidazolium cations.
Physical properties of binary and ternary mixtures of ethyl acetate, ethanol, and 1-octyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide at 298.15 K
Andreatta, Alfonsina E.,Arce, Alberto,Rodil, Eva,Soto, Ana
, p. 1022 - 1028 (2009)
Densities, viscosities, and refractive indices for binary and ternary mixtures of ethanol, ethyl acetate, and l-octyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide have been determined at 298.15 K and atmospheric pressure. Excess molar volumes, and viscosity and molar refraction changes of mixing have been calculated from the measured physical properties. These changes of mixing have been adequately fitted to the Redlieh - Kister polynomial equation. The adjustable parameters and the standard deviations between experimental and calculated values are reported.
Synthesis and characterization of nickel nanoparticles dispersed in imidazolium ionic liquids
Migowski, Pedro,Machado, Giovanna,Texeira, Sergio R.,Alves, Maria C. M.,Morais, Jonder,Traverse, Agnes,Dupont, Jairton
, p. 4814 - 4821 (2007)
The diameter and size-distribution of Ni nanoparticles prepared by the decomposition of [bis(1,5-cyclooctadiene)nickel(0)] organometallic precursor dissolved in 1-alkyl-3-methylimidazolium N-bis(trifluoromethanesulfonyl) amide ionic liquids depend on the length of the alkyl side-chain of the imidazolium ring. The increase of the organization range order of the ionic liquid that increases with that of the alkyl side-chain (from n-butyl to n-hexadecyl) induces the formation of nanoparticles with a smaller diameter and size-distribution. The cubic fcc Ni nanoparticles with 4.9 ± 0.9 to 5.9 ± 1.4 nm in mean diameter and monomodal size-distribution thus prepared are probably composed of a small cap layer of NiO around a core of Ni metal. The contribution of the oxide layer also depends on the medium i.e. the metal oxide ratio increases in salts containing four to eight carbons on their side-chains and then decreases as the number of carbons increases. The Ni nanoparticles dispersed in the ionic liquids are active catalysts for the hydrogenation of olefins under relatively mild reaction conditions. the Owner Societies.
Solubility of CO2, H2S, and their mixture in the ionic liquid 1-octyl-3-methylimidazolium bis(trifluoromethyl)sulfonylimide
Jalili, Amir Hossein,Safavi, Mohammadali,Ghotbi, Cyrus,Mehdizadeh, Ali,Hosseini-Jenab, Masih,Taghikhani, Vahid
, p. 2758 - 2774 (2012)
Gaseous solubilities of carbon dioxide (1), hydrogen sulfide (2), and their binary mixture (x2 ≈ 0.2, 0.5, 0.8) have been measured in the ionic liquid 1-octyl-3-methylimidazolium bis(trifluoromethyl)sulfonylimide ([C8mim][Tf2N]) at temperatures ranging from (303.15 to 353.15) K and at pressures under 2 MPa. The observed PTx solubility data were used to obtain Henry's law constants and correlated by three models: (1) the simple Krichevsky-Kasarnovsky (KK) equation, (2) a model comprised of the extended Henry's law and the Pitzer's virial expansion for the excess Gibbs free energy, and (3) the generic Redlich-Kwong (RK) cubic equation of state proposed for gas-ionic liquid systems. The correlations from the three models show quite good consistency with the experimental data for IL/CO2 and IL/H 2S binary mixtures within experimental uncertainties. For IL/CO 2/H2S ternary mixtures, the RK model shows the best correlation with the experimental data. The comparison showed that the solubility of H2S is about two times as great as that of CO 2 in the ionic liquid studied in this work. It was further found, by comparison of the experimental data of this study with those of previous reports, that the solubility of H2S in [Cnmim][Tf 2N] ILs increases as the number of carbon atoms in the alkyl substituent of methylimidazolium cation, n, increases. In addition, quantum chemical calculations at DFT/B3LYP level of theory using 6-311+G(d) and 6-311++G(2d,2p) basis sets were performed on the isolated systems studied in this work to provide explanations from a molecular point of view for the observed experimental trends.
Nanoreactors stable up to 200 °c: A class of high temperature microemulsions composed solely of ionic liquids
Pei, Yuanchao,Ru, Jie,Yao, Kaisheng,Hao, Lihui,Li, Zhiyong,Wang, Huiyong,Zhu, Xingqi,Wang, Jianji
supporting information, p. 6260 - 6263 (2018/06/22)
It is a challenge to develop microemulsions which can serve as nanoreactors for the synthesis of nanoparticles and chemical reactions at high temperature. In this work, a class of novel high temperature microemulsions consisting solely of ionic liquids have been designed and prepared for the first time. It is found that nanoscale droplets formed in the ionic liquid microemulsions can be maintained up to 200 °C, and the size distribution of the droplets can be easily tuned by selection of the ionic liquids and varying compositions of the systems. By using such microemulsions as nanoreactors, porous metals such as Pt have been prepared at 180 °C without using any purposely added reductant.
Anion Analysis of Ionic Liquids and Ionic Liquid Purity Assessment by Ion Chromatography
Rutz, Christina,Schmolke, Laura,Gvilava, Vasily,Janiak, Christoph
supporting information, p. 130 - 135 (2017/02/05)
The simultaneous determination of halide impurities (fluoride, chloride, bromide, and iodide) and ionic liquid (IL) anions (tetrafluoroborate, hexafluorophosphate, and triflimide) using ion chromatography was developed with a basic, non-gradient ion chromatography system. The non-gradient method uses the eluent Na2CO3/NaHCO3in water/acetonitrile (70:30 v:v) on the AS 22 column to enable a rapid and simultaneous analysis of different IL and halide anions within an acceptable run-time (22 min) and with good resolution R of larger than 2.4, a capacity k′ between 0.4 and 5.1, selectivities α between 1.3 and 2.1, and peak asymmetries Asof less than 1.5. Halide impurities below 1 ppm (1 mg·L–1of prepared sample solution) could be quantified. A range of ionic liquids with tetrafluoroborate [BF4]–, hexafluorophosphate [PF6]–, and bis(trifluoromethylsulfonyl)imide (triflimide) [NTf2]–anions combined with cations based on imidazole, pyridine, and tetrahydrothiophene could be analyzed for their anion purity. The IL-cations do not influence the chromatographic results. With the analysis of 18 ILs differing in their cation-anion combination we could prove the general applicability of the described method for the anion purity analysis of ionic liquids with respect to halide ions. The IL-anion purity of most ILs was above 98 wt %. The highest IL-anion purity was 99.8 wt %, implying anion impurities of only 0.2 wt %. The used halide anion from the synthesis route was the major anion impurity, yet with chloride also bromide and fluoride (potentially from hydrolysis of [BF4]–) were often detected. When iodide was used, at least chloride but sometimes also bromide and fluoride was present. However, even if the IL-anion content is above 99 wt %, it does not necessarily indicate an ionic liquid devoid of other impurities. From the IC analysis, one can also deduce a possible cation impurity if one takes into account the expected (calculated) IL-anion content. A matching experimental and theoretical IL-anion content excludes, a higher experimental content indicates the presence of residual KBF4, NH4PF6, or LiNTf2salt from the halide to IL-anion exchange.
First observation for dynamic solvent effect in ionic liquids
Kitaoka, Satoshi,Nobuoka, Kaoru,Miura, Junji,Ohga, Yasushi,Ishikawa, Yuichi
, p. 385 - 387 (2016/05/09)
We observed pressure effects on the rate of thermal fading of colored chromene 1 photochemically generated from 2 in ionic liquids. The reaction rates were retarded with increasing pressure in [C4-mim][CS], [bzl-mim][Tf2N], and [mnp-mim][Tf2N], whereas the reaction rate increased with pressures in [C4- mim][Tf2N]. These pressure-induced retardations, so-called dynamic solvent effects, result from the slow thermal fluctuations of solvents.
