NMR Studies of Molten Salt and Room Temperature Ionic Liquids

Rollet, Anne‐Laure; Bessada, Catherine

doi:10.1016/b978-0-12-404716-7.00004-3

Cited by 19 publications

(16 citation statements)

References 261 publications

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“…Nevertheless, the peak position is the weighted average of all the individual peak positions that should be obtained if the measurement was faster than the ion motions. 20 Hence, the value of the measured chemical shift can be derived using:…”

Section: Page 6 Of 17mentioning

confidence: 99%

“…19 An important factor in A c c e p t e d M a n u s c r i p t 3 these developments is the availability of high purity materials inert toward molten fluorides (boron nitride, pyrolitic boron nitride and glassy carbon) for the design of new sample containers. Nuclear magnetic resonance (NMR) spectroscopy, 20,21 extended X-ray fine absorption spectroscopy, 22,23 Raman spectroscopy, 24 electrochemistry, 25,26 thermodynamics studies, 27,28,29 etc. have thus beneficiated a new impulse.…”

Section: Introductionmentioning

confidence: 99%

“…19,33 Their structure span from simple bath of hard charged spheres to liquid network or liquid with free complexes. 1,34,20 Indeed, it is well known that within the family of molten fluorides important modifications in the thermodynamic and transport properties occur when the nature of the cation is changed. 35,36 One can distinguish acidic cations, which tend to form long-lived ionic bonds 37 with the fluoride anions from basic ones, which provide "free" fluoride anions to the melt, even though a proper scale of acidity remains to be built in these media 38 .…”

Section: Introductionmentioning

confidence: 99%

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Evidence of dynamical local scale distribution heterogeneities in CsF-AF (A=Li, Na, K and Rb) molten salts

Rollet

Bessada

2015

Journal of Fluorine Chemistry

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International audienceThe local structure of molten CsF-AF (A = Li, Na, K and Rb) has been studied by high temperature Nuclear Magnetic Resonance (NMR) spectroscopy. The 19F and 133Cs chemical shifts have been measured as a function of the molar fraction of CsF. 19F chemical shift varies linearly with composition while 133Cs chemical shift presents a break around the eutectics composition. Furthermore, in molten CsF-LiF at high CsF concentration, 133Cs chemical shift is nearly constant. The evolutions of 19F and 133Cs chemical shifts versus CsF-AF composition have been interpreted as a signature of dynamical local scale distribution heterogeneities

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Section: Page 6 Of 17mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evidence of dynamical local scale distribution heterogeneities in CsF-AF (A=Li, Na, K and Rb) molten salts

Rollet

Bessada

2015

Journal of Fluorine Chemistry

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“…This trend seems to confirm the involvement of CF 3 … H 3 C-N + hydrogen bond capability, which intensity is, once again, modulated by the mole fraction of TFSI anon. These conclusions, although far from providing a general, clear-cut model for the Li solvation shell in these systems, are nevertheless consistent with the effect of short-range interactions monitored by 1 …”

Section: Resultsmentioning

confidence: 50%

“…In the large repertoire of physical methods used for ILs' characterization, NMR spectroscopy is still playing an important role, outlined in some recent review articles [1,2]. In turn, the nuclear Overhauser enhancement (NOE) is one of the most powerful NMR tool for the assessment of three dimensional structure of molecules [3] and for the detection of intermolecular interactions [4].…”

Section: Introductionmentioning

confidence: 99%

Multiple points of view of heteronuclear NOE: Long range vs short range contacts in pyrrolidinium based ionic liquids in the presence of Li salts

Castiglione

Appetecchi

Passerini

et al. 2015

Journal of Molecular Liquids

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The nuclear Overhauser enhancement (NOE) is a powerful tool of NMR Spectroscopy extensively used to gain structural information in ionic liquids (ILs). A general model for the distance dependence of intermolecular NOE in ILs was recently proposed showing that NOE spots beyond the first solvation shell and accounts for long-range effects. This conclusion prompted for a deep rethinking of the NOE data interpretation in ILs. In this paper we present an extensive and quantitative study of N-propyl-N-methyl pyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR 13 TFSI), the homologue with bis ( Li}NOE correlation experiments (HOESY). The former is mainly tuned on long-range interactions, the latter on short-range ones, due to the small and large Larmor frequency differences of the involved nuclei. The collected data are discussed in two different way: long-range { 1 H- 19F}NOEs spot on the polar/apolar domains within the ILs, whereas shortrange (e.g. regarding the first coordination shell) { 1 H-7 Li}NOEs describe the contacts between first neighbors, with interesting correlation with the distances' statistics derived by crystallographic data of related systems.

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Influence of ionic liquid on the polymer–filler coupling and mechanical properties of nano‐silica filled elastomer

Zhang

Xue

Wang

et al. 2016

J of Applied Polymer Sci

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The natural rubber (NR) nanocomposites were fabricated by filling ionic liquid (1-allyl-3-methyl-imidazolium chloride, AMI) modified nano-silica (nSiO 2 ) in NR matrix through mechanical mixing and followed by a cure process. Based on the measurements of differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), solid state nuclear magnetic resonance spectroscopy, and Raman spectroscopy, it was proved that AMI could interact with nSiO 2 through hydrogen bonds. With the increase of AMI content, the curing rate of nSiO 2 /NR increased. The results of bound rubber and dynamic mechanical properties showed that polymer-filler interaction increased with the modification of nSiO 2 . Morphology studies revealed that modification of nSiO 2 resulted in a homogenous dispersion of nSiO 2 in NR matrix. AMI modified nSiO 2 could greatly enhance the tensile strength and tear strength of nSiO 2 /NR nanocomposites. Compared to unmodified nSiO 2 /NR nanocomposite, the tensile strength of AMI modified nSiO 2 /NR nanocomposite increased by 102%.

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NMR Studies of Molten Salt and Room Temperature Ionic Liquids

Cited by 19 publications

References 261 publications

Evidence of dynamical local scale distribution heterogeneities in CsF-AF (A=Li, Na, K and Rb) molten salts

Evidence of dynamical local scale distribution heterogeneities in CsF-AF (A=Li, Na, K and Rb) molten salts

Multiple points of view of heteronuclear NOE: Long range vs short range contacts in pyrrolidinium based ionic liquids in the presence of Li salts

Influence of ionic liquid on the polymer–filler coupling and mechanical properties of nano‐silica filled elastomer

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