A new fluorinated anion for room-temperature ionic liquids

Herath, Mahesha B.; Hickman, Tom; Creager, Stephen E.; DesMarteau, Darryl D.

doi:10.1016/j.jfluchem.2010.11.005

Cited by 18 publications

(13 citation statements)

References 6 publications

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“…The effect of the anion on ionic conductivity was compared among ME-FIL 2 , ME-FIL 6 , and ME-FIL 7 . ME-FIL 2 combining the [NTf 2 ] − anion has a higher ionic conductivity (0.22 S/m), which is close to the value of ME-FIL 6 with a [BF 4 ] − anion (0.21 S/m), than ME-IL 7 with a [PF 6 ] − anion (0.064 S/m), and lower than the value (0.406 S/m) of non-ether-functionalized ILs [BMIm][NTf 2 ] [39]. This significant difference in ionic conductivity caused by anions may be related to the different hydrogen bond interactions between the anion and cation of ME-FILs, and the stronger interaction limit, the freeer the mobility of both the cation and anion [40].…”

Section: Resultsmentioning

confidence: 59%

Effect of Ionic Composition on Physicochemical Properties of Mono-Ether Functional Ionic Liquids

et al. 2019

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Tunable properties prompt the development of different “tailor-made” functional ionic liquids (FILs) for specific tasks. FILs with an ether group are good solvents for many organic compounds and enzymatic reactions. However, ionic composition influences the solubility by affecting the physiochemical properties of these FILs. To address the structure effect, a series of novel FILs with a mono-ether group (ME) based on imidazole were prepared through cationic functionalization and anionic exchange reactions, and characterized by NMR, mass spectroscopy, and Thermogravimetric analysis (TGA). The effect of ionic composition (cationic structure and anions) on density, viscosity, ionic conductivity, electrochemical window, and thermal properties of these ME-FILs were systematically investigated. In general, the viscosity and heat capacity increases with the bigger cationic volume of ME-FILs; in particular, the 2-alkyl substitution of imidazolium enhances the viscosity remarkably, whereas the density and conductivity decrease on the condition of the same [NTf2]− anion; For these ME-FILs with the same cations, the density follows the order of [NTf2]− > [PF6]− > [BF4]−. The viscosity follows the order of [PF6]− > [BF4]− > [NTf2]−. Ion conductivity follows the order of [NTf2]− ≈ [BF4]− > [PF6]−. It is noted that the dynamic density has a good linear relationship with the temperature, and the slopes are the same for all ME-FILs. Furthermore, these ME-FILs have broad electrochemical windows and glass transition temperatures in addition to a cold crystallization and a melt temperature for ME-FIL7. Therefore, the cationic structure and counter anion affect the physicochemical properties of these ME-FILs together.

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Section: Resultsmentioning

confidence: 59%

Effect of Ionic Composition on Physicochemical Properties of Mono-Ether Functional Ionic Liquids

et al. 2019

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“…The EMIm + cation has been extensively used in researches of ILs since the ILs based on EMIm + often exhibit a low melting point and low viscosity with a variety of anions including many fluoroanions. 4,6,8,13,[19][20][21][22] This study reports the synthetic procedure and physical and electrochemical properties of the SO 3 F-based IL, EMImSO 3 F. The HOSO 2 F-rich forms, EMIm(FO 2 SOH)OSO 2 F and EMIm(FO 2 SOH) 2 O 2 SOF, which are obtained in a similar way to the case of EMImSO 3 F are also investigated in the present study. The (FO 2 SOH)OSO 2 F − anion was characterized by spectroscopic and diffractional techniques in previous reports 14,15 in the solid state, whereas (FO 2 SOH) 2 O 2 SOF − is unknown to our knowledge.…”

Section: Introductionmentioning

confidence: 91%

Properties of fluorosulfate-based ionic liquids and geometries of (FO2SOH)OSO2F− and (FO2SOH)2O2SOF−

2011

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A room temperature ionic liquid (IL) based on the fluorosulfate anion (SO(3)F(-)) has been synthesized by the reaction of 1-ethyl-3-methylimidazolium (EMIm(+)) chloride and fluorosulfuric acid (HOSO(2)F). The viscosity, ionic conductivity, and electrochemical window of EMImSO(3)F at 25 °C are 46.6 mPa s, 10.8 mS cm(-1), and 4.3 V, respectively. According to a solvatochromic measurement using ILs, there is a trend in the donor ability of fluoro- and oxofluoroanions, PF(6)(-) < BF(4)(-) < N(SO(2)CF(3))(2)(-) < SO(3)CF(3)(-) < SO(3)F(-) < PO(2)F(2)(-), which is explained by the atomic charges obtained from quantum mechanical calculations. The 1 : 2 and 1 : 3 stoichiometric reactions of EMImCl and HOSO(2)F give EMIm(FO(2)SOH)OSO(2)F and EMIm(FO(2)SOH)(2)O(2)SOF, respectively. Both the salts are liquid at room temperature without a HOSO(2)F dissociation pressure (< 1 Pa) and have low viscosity and high ionic conductivity (9.2 mPa s and 30.8 mS cm(-1) for EMIm(FO(2)SOH)OSO(2)F and 5.1 mPa s and 43.2 mS cm(-1) for EMIm(FO(2)SOH)(2)O(2)SOF). The vibrational modes and bonding properties of these anionic species are discussed with the aid of quantum mechanical calculations. The (FO(2)SOH)OSO(2)F(-) anion in EMIm(FO(2)SOH)OSO(2)F does not have an inversion centre, which stands in contrast to the one with an inversion centre (e.g. observed in solid Cs(FO(2)SOH)OSO(2)F). The (FO(2)SOH)(2)O(2)SOF(-) anion in EMIm(FO(2)SOH)(2)O(2)SOF is characterized by vibrational spectroscopy under C(s) symmetry.

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“…Room temperature ionic liquids (RTILs), synthetic molten salts with the melting temperature below room temperature, are promising lubricant candidates for HAMR because of their negligible vapor pressures, non-flammability, high thermal stability, broad liquid range and promising tribology properties. [3][4] In the current paper, we have evaluated the thermal stability, the lube uniformity, the boned ratio and the coefficient of friction of different RTILs on carbon overcoats (COC).…”

Section: Introductionmentioning

confidence: 99%

Room-temperature ionic liquids (RTILs): media lubricants for Heat-assisted magnetic recording (HAMR)?

Gong

West²,

Taylor³

et al. 2024

IEEE Trans. Magn.

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RTIL nanofilms have been evaluated for potential application as HAMR lubricants. The experimental results showed that RTILs are thermally more stable than Zdol and Ztetraol. Based on a 0-order kinetic model, the best RTIL is estimated to be able to survive ~10 8 -10 9 HAMR writes when the heating temperature is 400 °C. The RTILs containing fluorinated anions are readily solvable in Vertrel XF solvent and can be applied on the media by dip-coating. The lube uniformity of RTILs on COC is excellent and no dewetting is observed even when the RTIL nanofilm is as thick as 10 nm. The bonded ratio of RTILs is lower than Zdol/Ztetraol while the friction coefficient of RTILs is comparable to Zdol/Ztetraol. Index Terms-Room temperature ionic liquids (RTILs), media lubricants, heat-assisted magnetic recording (HAMR), tribology

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A new fluorinated anion for room-temperature ionic liquids

Cited by 18 publications

References 6 publications

Effect of Ionic Composition on Physicochemical Properties of Mono-Ether Functional Ionic Liquids

Effect of Ionic Composition on Physicochemical Properties of Mono-Ether Functional Ionic Liquids

Properties of fluorosulfate-based ionic liquids and geometries of (FO2SOH)OSO2F− and (FO2SOH)2O2SOF−

Room-temperature ionic liquids (RTILs): media lubricants for Heat-assisted magnetic recording (HAMR)?

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