Room-temperature ionic liquids (RTILs) are organic salts that characterized by low melting points. They considered to possess a homogeneous microscopic structure. We provide the first experimental evidence of existence nanoscale heterogeneities in neat liquid and supercooled RTILs, such as 1-alkyl-3-methyl imidazolium-based salts, using X-ray diffraction. These order few nanometers their size is proportional alkyl chain length. results strong support findings from recent molecular dynamics...

Ionic liquids represent an exciting novel class of materials with potentially enormous applicative impact; they are proposed as environmentally responsible replacements for the noxious volatile organic solvents, smart separation and catalysis media, or to develop electrochemical devices, just mention a few examples. Recently, compelling experimental well computational evidence highlighted complexity RTIL morphology at mesoscopic spatial scale, compared traditional molecular liquids. In this...

Here we report on the structural and dynamical properties of a series room temperature ionic liquids, namely 1-alkyl-3-methylimidazolium bis{(trifluoromethane)sulfonyl}amide ([Cnmim][NTf2]), with varying alkyl chain lengths (1≤n≤10) at ambient temperature, where all salts are stable liquids. Using small-wide angle x-ray scattering (SWAXS), three major diffraction peaks found: two high- Q that show little dependence length (n) low-Q peak strongly depends both in amplitude position n. This is...

Aiming at evaluating the impact of cation symmetry on nanostructuration ionic liquids (ILs), in this work, densities and viscosities as a function temperature small-wide angle X-ray scattering (SWAXS) patterns ambient conditions were determined analyzed for 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (asymmetric) 1,3-dialkylimidazolium (symmetric) series liquids. The symmetric IL series, [CN/2CN/2im][NTf2], presents lower than asymmetric [CN-1C1im][NTf2] counterparts. For...

The nonionic Type V deep eutectic solvent (DESs) thymol + menthol is experimentally and computationally studied aiming to clarify the relation between its liquid phase structure thermodynamic nonideality. 1H NMR, Raman, X-ray scattering analysis of system, supported by molecular dynamics simulations, show complex intermolecular interactions dominated sterically hindered H-bonded clusters. For temperatures greater than or equal room temperature, a quasi-linear evolution system properties pure...

Here we report on the complex nature of phase diagram N-alkyl-N-methylpiperidinium bis(trifluoromethanesulfonyl)imide ionic liquids using several complementary techniques and their structural order in molten state small-wide angle x-ray scattering. The latter study indicates that piperidinium aliphatic alkyl chains tend to aggregate, forming domains embedded into polar regions, similar what recently highlighted case other liquids.

In this article, the structure and intermolecular dynamics of 1,3-alkylmethylimidazolium bis(trifluoromethanesulfonyl)amides [C(n)mim][NTf(2)] with n = 2-5 are compared to those 1,3-dialkylimidazolium [(C(n))(2)im][NTf(2)] 2-5. The structures these room-temperature ionic liquids (RTILs) were studied by small-wide-angle X-ray scattering (SWAXS), their optical Kerr effect (OKE) spectroscopy. SWAXS measurements indicate that, on a microscopic scale, liquid RTILs symmetric cations is similar...

The existence of a high degree order over the mesoscopic spatial scale in room temperature ionic liquids is one their most intriguing properties. Recently possibility that such feature, witnessed by occurrence peculiar low Q diffraction features, reflects nm-scale structural organization has been questioned on basis both experimental and computational studies. In this contribution we discuss these studies present novel evidence confirm heterogeneities due to segregation apolar moieties...

A detailed investigation of the phase diagram 1-butyl-3-methyl imidazolium hexafluorophosphate ([bmim][PF(6)]) is presented on basis a wide set experimental data accessing thermodynamic, structural, and dynamical properties this important room temperature ionic liquid (RTIL). The combination quasi adiabatic, continuous calorimetry, angle neutron X-ray diffraction, elastic scattering allows exploration many novel features material. Thermodynamic microscopic structural information derived both...

In this paper, the morphology and bulk physical properties of 1,3-dialkylimidazolium bis{(trifluoromethane)sulfonyl}amide ([(C(N/2))(2)im][NTf(2)]) are compared to that 1-alkyl-3-methylimidazolium ([C(N-1)C(1)im][NTf(2)]) for N = 4, 6, 8, 10. For a given pair ionic liquids (ILs) with same N, ILs differ only in symmetry alkyl substitution on imidazolium ring cation. Small-wide-angle X-ray scattering measurements indicate that, symmetric/asymmetric IL pair, structural heterogeneities larger...

Abstract We present here the possibility of forming triphilic mixtures from alkyl‐ and fluoroalkylimidazolium ionic liquids, thus, macroscopically homogeneous for which instead often observed two domains—polar nonpolar—three stable microphases are present: polar, lipophilic, fluorous ones. The fluorinated side chains cations indeed self‐associate form domains that segregated those polar alkyl domains. To enable miscibility, despite generally preferred macroscopic separation between moieties,...

The present study analyses the large structural differences, first observed using X-ray diffraction, between 1-alkyl-3-methylimidazolium-based ionic liquids, [Cnmim][Ntf2] (n = 3, 6, 9), and their counterparts with ether-substituted alkyl side chains, [(C1OC1)(n/3)mim][Ntf2] 9). MD simulations-obtained a non-polarizable atomistic force-field to model liquids under discussion-demonstrate that suppression of nanostructured nature in ether chains is persistent along entire series it not due any...

X-ray scattering data from four pairs of ionic liquids (ILs) are compared. The alkyl-substituted cations show a first sharp diffraction peak between 3 and 4 nm(-1) that is not observed for ILs having with ether- or hydroxy-substitutions. These observations indicate significant difference in the intermediate range order these liquids.

The structure of solutions lithium nitrate in a protic ionic liquid with common anion, ethylammonium nitrate, at room temperature is investigated by means molecular dynamics simulations. Several structural properties, such as density, radial distribution functions, hydrogen bonds, spatial and coordination numbers, are analyzed order to get picture the solvation cations this hydrogen-bonded, amphiphilically nanostructured environment. results reveal that mainly retains its upon salt addition,...

Ionic liquids (ILs) represent a blooming class of continuously developing advanced materials, with the aiming green chemical industry. Their appealing physical and properties are largely influenced by their micro- mesoscopic structure that is known to possess high degree hierarchical organization. High-impact application fields affected complex morphology neat ionic mixtures. This Perspective highlights new arising research directions point an enhanced level structural complexity in several...

We report the first quasielastic neutron scattering measurements on a room temperature ionic liquid: 1-n-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6]. Data were collected using medium resolution spectrometer as function of in range 250–320 K. The data unequivocally indicate existence two different relaxation processes: fast, localized motion occurring subpicosecond and slower process spanning subnanosecond regime. These results provide experimental support to recently published...

Abstract Fourier‐transform infrared and Raman spectroscopies have been used to investigate the role played by water on structural organization of 1‐butyl‐3‐methyl‐imidazolium tetrafluoroborate H 2 O mixtures, over a wide composition range at room temperature. Our measurements provide clear experimental evidence prompt association between ‘free’ molecules anions very small contents. Moreover, in case higher contents, we obtain indications local aggregation network. Such an is found occur even...

We report on an experimental and simulation study done a representative room temperature ionic liquid, namely tetradecyltrihexylphosphonium chloride, at ambient conditions. The was conducted using small wide angle X-ray scattering molecular dynamics simulations. Both approaches converge in indicating that this material is characterized by the existence of strong P-Cl interactions (with characteristic distances between 3.5 5.0 A) occurrence nanoscale segregation, despite symmetric nature...

X-ray diffraction data for 1-alkyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}amides are reported as a function of the length alkyl chain on imidazolium ring. The measured patterns have been compared with theoretical calculated (from geometries obtained) molecular dynamics simulations. This provides detailed description (at atomistic level) morphology in liquid state these salts, highlighting role played by length. An analysis behavior hydrogen bonds that formed between acidic protons...

We report for the first time joined energy dispersed x-ray and neutron diffraction experiments on a series of (both protiated selectively deuteriated) 1-alkyl-3-methylimidazolium hexafluorophosphate salts (alkyl = butyl, hexyl, octyl) at ambient conditions. The experimental data are used to optimize interaction potential running molecular dynamics simulations these systems. Such leads good description scattering from samples without additional refinement, thus further validating definition....

Room temperature ionic liquids are one of the most exciting classes materials in last decade. The interest for these low melting, compounds stems from both their technological impact and stimulating plethora structural dynamic peculiarities mesoscopic space-time scales. It is nowadays well-established that they characterised by an enhanced degree order originating inherent amphiphilicity. In this contribution we highlight existence a further complexity when dealing with RTILs bearing medium...

The mesoscopic morphology of binary mixtures ethylammonium nitrate (EAN), the protic ionic liquid par excellence, and methanol is explored using neutron/X-ray diffraction computational techniques. Both compounds are amphiphilic characterized by an extended hydrogen bonding network: surprisingly, though macroscopically homogeneous, these turn out to be mesoscopically highly heterogeneous. Our study reveals that even in methanol-rich mixtures, a wide distribution clusters exists where EAN...

A range of analytical techniques (DSC, conductivity measurement, Raman spectroscopy, small- and wide-angle X-ray diffraction (S-WAXS), quasi-elastic neutron scattering (QENS), single-crystal diffraction) are applied to the characterization phase behavior low-melting-point liquid crystalline salts 1-hexadecyl-3-methylimidazolium hexafluorophosphate ([C16mim][PF6]) 1-methyl-3-tetradecylimidazolium [C14mim][PF6]. This is first time that QENS has been structural analysis this type ionic crystal....