Structure, Conformations, Vibrations, and Ideal-Gas Properties of 1-Alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide Ionic Pairs and Constituent Ions

Paulechka, Yauheni U.; Kabo, Gennady J.; Emel′yanenko, Vladimir N.

doi:10.1021/jp804607n

Cited by 63 publications

(103 citation statements)

References 40 publications

(109 reference statements)

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“…A review of the thermodynamics of IL vaporization has been recently published [8]. The ideal-gas entropies of [C n mim]NTf 2 consistent with the experimental values were calculated in [9].…”

Section: Introductionmentioning

confidence: 75%

Experimental determination of enthalpy of 1-butyl-3-methylimidazolium iodide synthesis and prediction of enthalpies of formation for imidazolium ionic liquids

Kabo

Paulechka

Kabo

et al. 2010

The Journal of Chemical Thermodynamics

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Section: Introductionmentioning

confidence: 75%

Experimental determination of enthalpy of 1-butyl-3-methylimidazolium iodide synthesis and prediction of enthalpies of formation for imidazolium ionic liquids

Kabo

Paulechka

Kabo

et al. 2010

The Journal of Chemical Thermodynamics

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“…However, calculations 33,34 indicate that the conformations of [Tf 2 N] À can freely interconvert in the room temperature bulk liquid, and are essentially the same in the gas phase neutral ion pair. However, calculations 33,34 indicate that the conformations of [Tf 2 N] À can freely interconvert in the room temperature bulk liquid, and are essentially the same in the gas phase neutral ion pair.…”

Section: Discussionmentioning

confidence: 99%

Mono- and multi-layer adsorption of an ionic liquid on Au(110)

Foulston

Gangopadhyay

Chiutu

et al. 2012

Phys. Chem. Chem. Phys.

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Ultraviolet photoelectron spectroscopy (UPS), work function measurements, low energy electron diffraction (LEED) and scanning tunnelling microscopy (STM) have been used to study the adsorption and desorption of 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide, [C(2)C(1)Im][Tf(2)N], on the (1×2) clean surface reconstruction of Au(110) in the temperature range 100-674 K. The ionic liquid adsorbed without decomposition, and desorbed without leaving any residue on the surface. For adsorption at room temperature a monolayer of strongly bound ionic liquid was formed with four interface states visible in UP spectra. STM at 100 K showed that the monolayer consisted of well-ordered rows of adsorbed ionic liquid aligned parallel to the close packed rows of surface gold atoms (the [110] direction) with a separation of ×2 (the same as the clean surface reconstruction) between the rows in the orthogonal [001] direction. Multilayer adsorption at room temperature occurred by droplet formation followed by smoothing of the droplets to a layered morphology with time. Heating caused multilayer desorption at temperatures in the 363-383 K range, followed by partial monolayer desorption at 548 K to produce a Au(110)-(1×3) reconstructed surface with sub-monolayer domains of ionic liquid. Desorption of the remaining ionic liquid at 600 K caused the gold surface to reconstruct back to the clean (1×2) reconstruction.

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“…6 (right). Figure 6 (left) also shows the ideal gas heat capacity of an IL [C6mim][NTf2] reported by Paulechka and Kabo [29]. As one can note from Fig.…”

Section: Resultsmentioning

confidence: 89%

“…(2) and (3). Dashed-dotted line is ideal gas isochoric heat capacity from [29]. Circles are present data and squares are previously reported data [27]…”

Section: Figmentioning

confidence: 99%

Thermodynamic Properties at Saturation Derived from Experimental Two-Phase Isochoric Heat Capacity of 1-Hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide

et al. 2016

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New measurements are reported for the isochoric heat capacity of the ionic liquid substance 1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C6mim][NTf2]). These measurements extend the ranges of our earlier study [N.G. Polikhronidi et al., Phys. Chem. Liq. 52, 657 (2014)] by 5 % of the compressed liquid density and by 75 kelvins. An adiabatic calorimeter was used to measure one-phase (CV1) liquid and two-phase (CV2) liquid + vapor isochoric heat capacities, densities (ρS), and phase-transition temperatures (TS) of the ionic liquid (IL) substance. The combined expanded uncertainty of the density ρ and isochoric heat capacity CV measurements at the 95 % confidence level with a coverage factor of k = 2 is estimated to be 0.15 % and 3 %, respectively. Measurements are concentrated in the immediate vicinity of the liquid + vapor phase transition curve, in order to closely observe phase transitions. The present measurements and those of our earlier study are analyzed together, and are presented in terms of thermodynamic properties (TS, ρS, CV1 and CV2) evaluated at saturation and in terms of key derived thermodynamic properties Cp, CS, WS',KTS',false(∂P/∂Tfalse)V', and false(∂V/∂Tfalse)P'false) on the liquid + vapor phase transition curve. A thermodynamic relation by Yang and Yang is used to confirm the internal consistency of measured two-phase heat capacities CV2, which are observed to fall perfectly on a line as a function of specific volume at a constant temperature. The observed linear behavior is exploited to evaluate contributions to the quantity CV2 = f(V,T) from chemical potential CnormalVnormalμ=−Td2μnormaldT2 and from vapor pressure CVP=italicVTd2PSnormaldT2. The physical nature and specific details of the temperature and specific volume dependence of the two-phase isochoric heat capacity and some features of the other derived thermodynamic properties of IL at liquid saturation curve are considered in detail.

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Structure, Conformations, Vibrations, and Ideal-Gas Properties of 1-Alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide Ionic Pairs and Constituent Ions

Cited by 63 publications

References 40 publications

Experimental determination of enthalpy of 1-butyl-3-methylimidazolium iodide synthesis and prediction of enthalpies of formation for imidazolium ionic liquids

Experimental determination of enthalpy of 1-butyl-3-methylimidazolium iodide synthesis and prediction of enthalpies of formation for imidazolium ionic liquids

Mono- and multi-layer adsorption of an ionic liquid on Au(110)

Thermodynamic Properties at Saturation Derived from Experimental Two-Phase Isochoric Heat Capacity of 1-Hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide

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