Raman spectra of acetonitrile in imidazolium ionic liquids

Garcia, Humberto C.; Oliveira, Luiz Fernando Cappa de; Nicolau, Bruno G.; Ribeiro, Mauro C. C.

doi:10.1002/jrs.2628

Cited by 20 publications

(14 citation statements)

References 25 publications

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“…ion–ion and ion‐molecule) . Among the molecular solvents employed in these studies we mention both the protic non‐aqueous solvents such as ethanol, methanol, and ethylene glycol as well as the aprotic ones like DMSO, AN, acetone, or chloroform …”

Section: Introductionmentioning

confidence: 99%

Intermolecular interactions, ion solvation, and association in mixtures of 1‐n‐butyl‐3‐methylimidazolium hexafluorophosphate and γ‐butyrolactone: insights from Raman spectroscopy

Marekha

Koverga

Moreau

et al. 2015

J Raman Spectroscopy

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By means of Raman spectroscopy coupled with density functional theory (DFT) calculations and perturbation correlation moving window two-dimensional correlation spectroscopy intermolecular interactions were assessed in mixtures of ionic liquid (IL) 1-nbutyl-3-methylimidazolium hexafluorophosphate (BmimPF 6 ) with polar aprotic solvent γ-butyrolactone (γ-BL) over the entire range of compositions. The symmetrical P-F stretching vibration of the IL anion was found to be insensitive to the changes in mixture concentration in contrast to the C¼O stretching vibration of the γ-BL and the imidazolium ring C-H stretching vibrations of the IL cation. Each of these vibrational profiles was decomposed in various spectral contributions, and their number was rationalized by the results of quantum-chemical calculations and/or previous controversial published data. Progressive redshift of the ring C-H stretching wavenumbers was referred to pronounced solvation of the cation at the imidazolium ring site accompanied with H-bond formation. This was especially pronounced at IL mole fraction less than 0.18. Complicated variations in the intensities of the individual contributions of the C¼O profile were treated as a manifestation of the changing with concentration pattern of the intermolecular interactions. The self-association of γ-BL molecules and distinct cation solvation as dominant intermolecular interactions at low IL content are replaced with weaker cation solvation and ion association at high concentrations of IL. Possible representative molecular structures were proposed on the basis of DFT calculations.

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Section: Introductionmentioning

confidence: 99%

Intermolecular interactions, ion solvation, and association in mixtures of 1‐n‐butyl‐3‐methylimidazolium hexafluorophosphate and γ‐butyrolactone: insights from Raman spectroscopy

Marekha

Koverga

Moreau

et al. 2015

J Raman Spectroscopy

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“…With similar anions in both salts and with the difference in their cationic species, the ionic conductivity results agree with the previous reports. 17,18) The obvious difference is that the ionic conductivities of both salts are far higher in ACN than in PC.…”

Section: )mentioning

confidence: 99%

Supercapacitive Properties of Carbon Electrode in an Electrolyte Containing a Newly Synthesized Two-Cation Salt

Cho¹,

Yeom²,

et al. 2011

Journal of Electrochemical Science and Technology

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:To examine the effects of a two-cation ionic liquid as an electrolyte component of a supercapacitor, 1,4-bis(3-methylimidazolium-1-yl)butane tetrafluoroborate (MIBBF 4 ), dissolved in propylene carbonate (PC) or acetonitrile (ACN), is newly synthesized and tested here for potential use as an electrolyte of capacitor. The MIBBF 4 salt exhibits higher ionic conductivity in ACN than in PC. The supercapacitive properties of capacitors containing an activated carbon electrode and various electrolytes are evaluated using cyclic voltammetry and electrochemical impedance spectroscopy. The capacitor adopting the MIBBF 4 /ACN electrolyte shows the largest specific capacitance at low scan rates, whereas the capacitor adopting the 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF 4 )/ACN electrolyte shows the largest specific capacitance at high scan rates.

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“…[80][81][82][83][84][85][86][87] Umebayashi et al 80 The effect of the chain length in the structure of imidazolic ionic liquids and dimethylformamide solutions is probed by Rodrigues and Santos using Raman spectroscopy. [80][81][82][83][84][85][86][87] Umebayashi et al 80 The effect of the chain length in the structure of imidazolic ionic liquids and dimethylformamide solutions is probed by Rodrigues and Santos using Raman spectroscopy.…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…[80][81][82][83][84][85][86][87] Umebayashi et al 80 The effect of the chain length in the structure of imidazolic ionic liquids and dimethylformamide solutions is probed by Rodrigues and Santos using Raman spectroscopy. 82 The authors use Raman band shape of n (CN) band, corresponding to the CN stretching mode of CH 3 CN for this purpose. The authors report that due to the high electric dipole moment of the group C¼O, there is a substantial coupling between adjacent molecules in the solution, and the corresponding Raman band involved both vibrational and reorientational modes.…”

Section: Raman Spectroscopymentioning

confidence: 99%