Vibrational Spectroscopy of Ionic Liquid Surfaces

Peñalber-Johnstone, Chariz; Baldelli, Steven

doi:10.1002/9781118840061.ch7

Cited by 2 publications

(3 citation statements)

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“…These Raman spectroscopic studies have been reviewed more recently by Saha et al 4 The more specific issue of vibrational spectroscopy of ionic liquid surfaces using linear and nonlinear techniques has also been reviewed recently. 5 In this review, we will address both IR and Raman studies encompassing a wide group of cations and anions commonly used in forming ionic liquids. Figure 1 shows molecular structures of several cations and anions whose vibrational spectra will be discussed in this review, together with notation used throughout this work.…”

Section: Introductionmentioning

confidence: 99%

“…Berg’s review focused on the spectroscopic signatures of molecular conformations achieved by the ions, mainly 1-alkyl-3-methylimidazolium and N , N -dialkylpyrrolidinium cations, and the bis(trifluoromethanesulfonyl)imide anion, [NTf 2 ] − . These Raman spectroscopic studies have been reviewed more recently by Saha et al The more specific issue of vibrational spectroscopy of ionic liquid surfaces using linear and nonlinear techniques has also been reviewed recently . In this review, we will address both IR and Raman studies encompassing a wide group of cations and anions commonly used in forming ionic liquids.…”

Section: Introductionmentioning

confidence: 99%

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Vibrational Spectroscopy of Ionic Liquids

2017

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Vibrational spectroscopy has continued use as a powerful tool to characterize ionic liquids since the literature on room temperature molten salts experienced the rapid increase in number of publications in the 1990's. In the past years, infrared (IR) and Raman spectroscopies have provided insights on ionic interactions and the resulting liquid structure in ionic liquids. A large body of information is now available concerning vibrational spectra of ionic liquids made of many different combinations of anions and cations, but reviews on this literature are scarce. This review is an attempt at filling this gap. Some basic care needed while recording IR or Raman spectra of ionic liquids is explained. We have reviewed the conceptual basis of theoretical frameworks which have been used to interpret vibrational spectra of ionic liquids, helping the reader to distinguish the scope of application of different methods of calculation. Vibrational frequencies observed in IR and Raman spectra of ionic liquids based on different anions and cations are discussed and eventual disagreements between different sources are critically reviewed. The aim is that the reader can use this information while assigning vibrational spectra of an ionic liquid containing another particular combination of anions and cations. Different applications of IR and Raman spectroscopies are given for both pure ionic liquids and solutions. Further issues addressed in this review are the intermolecular vibrations that are more directly probed by the low-frequency range of IR and Raman spectra and the applications of vibrational spectroscopy in studying phase transitions of ionic liquids.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vibrational Spectroscopy of Ionic Liquids

2017

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“…RTILs are thus typically stable in UHV environments, permitting the use of a wide range of powerful surface science methods that can provide information on liquid–vacuum interfacial composition, structure, and reactivity. Examples of vacuum surface science methods that can be applied to ILs include sum frequency generation, − low-energy ion scattering, high-resolution Rutherford backscattering, , X-ray photoelectron spectroscopy (XPS), − time-of-flight secondary ion mass spectrometry (TOF-SIMS), and reactive-atom scattering (RAS). − …”

Section: Introductionmentioning

confidence: 99%

Probing a Ruthenium Coordination Complex at the Ionic Liquid–Vacuum Interface with Reactive-Atom Scattering, X-ray Photoelectron Spectroscopy, and Time-of-Flight Secondary Ion Mass Spectrometry

et al. 2019

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The speciation, conformation, and reactivity of transition metal complexes at the gas−liquid interface are poorly understood, yet the potential is high for observing chemistry unique to this anisotropic interface and leveraging interfacial structure to control the state and environment of the complex. If transition metal complexes can be designed to populate a liquid−vacuum interface preferentially, then it may be possible to explore catalytic behavior by delivering reactants to the interface with a molecular beam and monitoring the scattering dynamics of reaction products to obtain detailed information on the reaction mechanism. In this initial experimental study, we have used reactive-atom scattering with a hyperthermal F-atom probe, X-ray photoelectron spectroscopy, and time-of-flight secondary ion mass spectrometry to explore the interfacial composition and structure of a ∼2 mg/mL solution of [RuCl 2 (p-cymene)P(C 8 H 17 ) 3 ] in perdeuterated 1-ethyl-3-methylimidazolium bis-(trifluoromethylsulfonyl)imide (d 11 -[C 2 mim][Tf 2 N]). These data provide strong evidence that a Ru complex is present at the extreme liquid−vacuum interface with a number density that is higher than expected from the bulk concentration (2−3 vs 0.04%). The experimental data also provide information on the chemical nature and environment of the Ru complex that resides at or near the extreme liquid−vacuum interface.

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Vibrational Spectroscopy of Ionic Liquid Surfaces

Cited by 2 publications

References 61 publications

Vibrational Spectroscopy of Ionic Liquids

Vibrational Spectroscopy of Ionic Liquids

Probing a Ruthenium Coordination Complex at the Ionic Liquid–Vacuum Interface with Reactive-Atom Scattering, X-ray Photoelectron Spectroscopy, and Time-of-Flight Secondary Ion Mass Spectrometry

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