Decolorization of Ionic Liquids for Spectroscopy

Earle, Martyn J.; Gordon, Christopher P.; Plechkova, Natalia V.; Seddon, Kenneth R.; Welton, Tom

doi:10.1021/ac061481t

Cited by 184 publications

(117 citation statements)

References 17 publications

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“…We will show in the present study that the C dc behavior at the IL«EGaIn interface measured using the pendant drop method reproduces that at the IL«Hg interface, supporting that the phenomena observed at the IL«Hg interface are universal for the EDL in ILs. 30,76 Before measurements, volatile impurities were removed from the ILs by using a rotary oil pump for more than 3 h at 60°C. EGaIn (99.99%, Alfa Aesar) was stored in an 1 M HCl aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Static Capacitance at the Electrochemical Liquid-liquid Interface Between Ionic Liquids and Eutectic Ga-In Alloy Measured Using the Pendant Drop Method

et al. 2018

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Static differential capacitance (C dc ) at the liquid-liquid interface between ionic liquids (ILs) and eutectic Ga-In alloy (EGaIn) has been measured using the pendant drop method for two ILs: 1-ethyl-3-methylimidazolium tetrafluoroborate ([C 2 mim + ]BF |Hg interface where IL-cation is the same but IL-anion is different. Also in that case, C dc is similar to each other at the negatively charged potential region, which means that accumulated C 8 mim + ions at the interface mainly govern the C dc behavior.

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Section: Introductionmentioning

confidence: 99%

Static Capacitance at the Electrochemical Liquid-liquid Interface Between Ionic Liquids and Eutectic Ga-In Alloy Measured Using the Pendant Drop Method

et al. 2018

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“…17 Hence, they are being actively investigated as alternative solvent media in synthesis, 18 catalysis, 19 polymerization, [20][21][22] separation, 23 electrochemistry 24,25 and electrochemical devices. 26,27 However, the basic science involved with fully characterizing these ILs is still in its infancy, and this may be holding back the complete and most efficient utilization of these potentially, and only in some cases, 28 41 dried under vacuum at 40 1C for 48 h, and stored under argon at 20 1C before analysis. Absorption spectra were recorded on a Varian Cary 100 Bio UV-Visible Spectrophotometer, this instrument is also equipped with a temperature-controlled 6 Â 6 multicell holder.…”

Section: Introductionmentioning

confidence: 99%

Photo- and solvatochromic properties of nitrobenzospiropyran in ionic liquids containing the [NTf2]− anion

Byrne

Fraser

Izgorodina

et al. 2008

Phys. Chem. Chem. Phys.

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The photo-, thermo-and solvatochromic properties of 2,3-dihydro-1 0 ,3 0 ,3 0 -trimethyl-6-nitrospiro-[1-benzopyran-2,2 0 -1H-indole] (BSP-NO 2 ) were studied in ILs containing the anion [NTf 2 ] À by UV-Vis absorption spectroscopy, ab initio molecular orbital theory and density functional theory (DFT) calculations. It was found that the kinetics and thermodynamics of the BSP-NO 2 2 MC (merocyanine) Q4 equilibrium was sensitive to the nature of the cation. It was also observed that the imidazolium cation can form a through-space orbital interaction with the MC isomer, rather than a simple electrostatic interaction, thus preventing the MC conversion back to the BSP-NO 2 isomer. The BSP-NO 2 2 MC equilibrium thus serves as a model system for studying modes of interaction of the cations in ionic liquids.

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“…59 The synthesis of the other ionic liquids shown in Figure 1 is described elsewhere, 11,60,61 and they were decolorized according to the procedure described previously. 62 Briefly, the impure ionic liquid was diluted and was allowed to elute through a column packed with celite, silica gel, and activated charcoal. After the excess solvent was removed, the ionic liquid was dried under vacuum with mild heating.…”

Section: à48mentioning

confidence: 99%

Structure and Dynamics of the 1-Hydroxyethyl-4-amino-1,2,4-triazolium Nitrate High-Energy Ionic Liquid System

et al. 2011

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An investigation of the structure and dynamics of the high-energy ionic liquid, 1-hydroxyethyl-4-amino-1,2,4-triazolium nitrate (HEATN), was undertaken. Both experimental and computational methods were employed to understand the fundamental properties, characteristics, and behavior of HEATN. The charge separation, according to the electrostatic potential derived charges, was assessed. The MP2 (second-order perturbation theory) geometry optimizations find six dimer and five tetramer structures and allow one to see the significant highly hydrogen bonded network predicted within the HEATN system. Due to the prohibitive scaling of ab initio methods, the fragment molecular orbital (FMO) method was employed and assessed for feasibility with highly energetic ionic liquids using HEATN as a model system. The FMO method was found to adequately treat the HEATN ionic liquid system as evidenced by the small relative error obtained. The experimental studies involved the investigation of the solvation dynamics of the HEATN system via the coumarin 153 (C153) probe at five different temperatures. The rotational dynamics through the HEATN liquid were also measured using C153. Comparisons with previously studied imidazolium and phosphonium ionic liquids show surprising similarity. To the authors' knowledge, this is the first experimental study of solvation dynamics in a triazolium-based ionic liquid. Disciplines Chemistry CommentsThis article is from Journal of Physical Chemistry B 116 (2012): 503, doi:10.1021/jp207840q. RightsWorks produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted. There has been a steeper than exponential growth in the number of publications related to ionic liquids since the year 2000. Authors1 The interest in ionic liquids reflects their versatility and their environmentally friendly properties in comparison to commonly used compounds.2À4 Ionic liquids are molten salts, commonly composed of an organic cation and an inorganic anion that can often be liquid at room temperature. These low-melting salts are considered to be green solvents, in contrast to volatile organic compounds, due to their high chemical and thermal stabilities, negligible vapor pressure, 5 and high recoverability and reusability.6,7 Ionic liquids can be customized by varying the identity of the substituents on the cation or by adapting the moiety of the anion.8 This versatility and these unique properties have piqued the interest of the scientific community, and a variety of fundamental studies 9À16 have been performed on ionic liquids to obtain a better understanding of their characteristics.One interesting application of ionic liquids is in the highenergy density matter (HEDM) community, where many different molten salts have been explored and reported. 17 It is important to understand what characteristics make ionic liquids suited to HEDM applications. This very problem was explored computationally in a series of studies,...

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Decolorization of Ionic Liquids for Spectroscopy

Cited by 184 publications

References 17 publications

Static Capacitance at the Electrochemical Liquid-liquid Interface Between Ionic Liquids and Eutectic Ga-In Alloy Measured Using the Pendant Drop Method

Static Capacitance at the Electrochemical Liquid-liquid Interface Between Ionic Liquids and Eutectic Ga-In Alloy Measured Using the Pendant Drop Method

Photo- and solvatochromic properties of nitrobenzospiropyran in ionic liquids containing the [NTf2]− anion

Structure and Dynamics of the 1-Hydroxyethyl-4-amino-1,2,4-triazolium Nitrate High-Energy Ionic Liquid System

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