Raman Investigation of the Ionic Liquid N-Methyl-N-propylpyrrolidinium Bis(trifluoromethanesulfonyl)imide and Its Mixture with LiN(SO2CF3)2

Castriota, Marco; Caruso, T.; Agostino, R. G.; Cazzanelli, E.; Henderson, Wesley A.; Passerini, Stefano

doi:10.1021/jp046030w

Cited by 205 publications

(173 citation statements)

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“…[14][15][16]20 In the frequency range, the Raman spectra for the ionic liquid containing Li + were similar to those previously reported for [EMI][TFSA], as expected. 20 As can be seen in Fig.…”

supporting

confidence: 88%

“…With regard to alkaline metal ions, a few Raman spectroscopic studies on lithium ion solvation have been published in connection with lithium ion secondary batteries using ionic liquids composed of bis(trifluoromethanesulfonyl)amide. [14][15][16] However, the lithium ion solvation number in ionic liquids was not clear, because the Raman spectra for ionic liquids containing lithium ion, and even neat ionic liquids, themselves, are quite complicated, i.e., according to our previous studies, the components 1-ethyl-3-methylimidazolium (EMI + ), 17 N-butyl-Nmethylpyrrolidinium (P14 + ) 18 and bis(trifluoromethanesulfonyl)-amide (TFSA -) 19 20 and elucidated that the lithium ion is coordinated by two TFSA -anions as a bidentate ligand, and that the anion in the first coordination sphere of the lithium ion prefers the cis conformation (two CF3 groups locate at the cis position with respect to the S-N-S plane), though the trans one is a slightly favorable isomer in neat ionic liquids. In order to understand the ion-ion interactions for metal ion solvation in ionic liquids in detail, it is needed to reveal the ionic radii dependence of the ion solvation.…”

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confidence: 99%

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Raman Spectroscopic Study on Alkaline Metal Ion Solvation in 1-Butyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)amide Ionic Liquid

et al. 2008

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confidence: 88%

mentioning

confidence: 99%

Raman Spectroscopic Study on Alkaline Metal Ion Solvation in 1-Butyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)amide Ionic Liquid

et al. 2008

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“…The band at 740 cm −1 is ascribed to the coupled bending δ(CF 3 ) + stretching ν(S-N-S) vibration of free [TFSA] − , which shifts to a higher frequency upon binding of [TFSA] − to the metal ion. 28,29 The concentration dependences of the deconvoluted Raman spectra in the frequency range 720-780 cm …”

Section: Resultsmentioning

confidence: 99%

Spectroscopic and Electrochemical Analyses for Neodymium Complexes in Potassium Bis(trifluoromethylsulfonyl)amide Melts

Matsumiya

Ota

Kuribara

et al. 2017

J. Electrochem. Soc.

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The coordination states of the multivalent neodymium complexes in potassium bis(trifluoromethyl-sulfonyl) amide; K [TFSA] were investigated by Raman spectroscopy. The concentration dependences of deconvoluted Raman spectra were investigated for 0.23-0.45 mol kg −1 Nd(III), and mixed sample of Nd(II)/Nd(III) = 1/3 at the molar ratio in K [TFSA]. According to the conventional analysis, the solvation number; n of neodymium complexes were determined to be n = 4.06 for Nd(II), 5.02 for Nd(III Rare earth (RE) elements have peculiar physicochemical properties and are indispensable for abrasives, catalysts, fluorescent materials and permanent magnets. [1][2][3][4] In particular, Nd-Fe-B permanent magnets have high ferromagnetic performance and it has been used for a variety of high-tech products, such as voice coil motors in hard disk drives, magnetic field sources for magnetic resonance imaging, driving motors for hybrid-type electric vehicles etc. 5-7From the standpoint of energy conservation, the development of a recovery process for RE metals with reduced energy consumption is desired. In previous investigations, we demonstrated the recovery of Nd metal using low-temperature molten salts (LTMSs), 8,9 because an LTMS has many useful physicochemical properties 10,11 such as a wide electrochemical window, low liquid-phase temperature, and high ionic conductivity. From an environmental point of view, LTMSs are stable compared to organic reagents and prevent the spreading of noxious decomposition chemicals because LTMSs can be recycled back into acid production cycles and be applied repeatedly as an electrolytic bath. Potassium bis(trifluoromethylsulfonyl) amide; K[TFSA] melts consisting of a potassium cation and a bis(trifluoromethyl-sulfonyl)amide;[TFSA] anion, as shown in Fig. 1, are useful candidates for LTMSs.In the case of the ionic liquids (ILs), it was known that the electrodeposition process was remarkably affected by the solvation structure of metal ion. It was reported that the solvation structures of various metal ions, Li,[12][13][14][15][16]

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“…The studies were performed over a temperature range extending from À100 to þ60 C, i.e., in the crystalline and melt states. For comparison purposes, the study [17] [165]. The CF 3 symmetric stretching and deformation bands are seen at 1242 and 742 cm À1 .…”

Section: Other Systemsmentioning

confidence: 99%

“…1. However, also other possibilities exist and have been investigated, like pyrrolidinium [17][18][19][20], guanidinium [21,22], 1,3-diazolium [23], or benzimidazolium [24] salts. In particular, the 1-alkyl-3-methylimidazolium salts are an interesting and useful class of room temperature ionic liquids.…”

Section: Introduction To Room Temperature Ionic Liquidsmentioning

confidence: 99%

Raman Spectroscopy and Ab-Initio Model Calculations on Ionic Liquids

2007

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Summary.A review of the recent developments in the study and understanding of room temperature ionic liquids are given. An intimate picture of how and why these liquids are not crystals at ambient conditions is attempted, based on evidence from crystallographical results combined with vibrational spectroscopy and ab-initio molecular orbital calculations. A discussion is given, based mainly on some recent FT-Raman spectroscopic results on the model ionic liquid system of 1-butyl-3-methylimidazolium ([C 4 mim][X]) salts. The rotational isomerism of the [C 4 mim] þ cation is described: the presence of anti and gauche conformers that has been elucidated in remarkable papers by Hamaguchi et al. Such presence of a conformational equilibrium seems to be a general feature of the room temperature liquids. Then the ''localized structure features'' that apparently exist in ionic liquids are described. It is hoped that the structural resolving power of Raman spectroscopy will be appreciated by the reader. It is of remarkable use on crystals of known different conformations and on the corresponding liquids, especially in combination with modern quantum mechanics calculations. It is hoped that these interdisciplinary methods will be applied to many more systems in the future. A few examples will be discussed.

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Raman Investigation of the Ionic Liquid N-Methyl-N-propylpyrrolidinium Bis(trifluoromethanesulfonyl)imide and Its Mixture with LiN(SO₂CF₃)₂

Cited by 205 publications

References 25 publications

Raman Spectroscopic Study on Alkaline Metal Ion Solvation in 1-Butyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)amide Ionic Liquid

Raman Spectroscopic Study on Alkaline Metal Ion Solvation in 1-Butyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)amide Ionic Liquid

Spectroscopic and Electrochemical Analyses for Neodymium Complexes in Potassium Bis(trifluoromethylsulfonyl)amide Melts

Raman Spectroscopy and Ab-Initio Model Calculations on Ionic Liquids

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