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- W2056519991 abstract "Fourier-transform infrared (FTIR) and time-resolved IR spectroscopies have been used to study vibrational band positions, vibrational energy relaxation (VER) rates, and reorientation times of anions in several ionic liquid (IL) solutions. The ILs primarily investigated are based on the 1-butyl-2,3-dimethylimidazolium ([BM2IM]) cation with thiocyanate (NCS−), dicyanamide (N(CN)2−), and tetrafluoroborate (BF4−) anions. Spectroscopic studies are carried out near 2000cm−1 for the CN stretching bands of NCS− and N(CN)2− as the IL anion as well as for NCS−, N(CN)2−, and azide (N3−) anions dissolved in [BM2IM][BF4]. The VER studies of N(CN)2− are reported for the first time. VER of N3−, NCS−, and N(CN)2− is measured in normal solvents, such as N-methylformamide, to compare with the IL solutions. The spectral shifts and VER rates of the anions in IL solution are quite similar to those in polar aprotic, conventional organic solvents, i.e., dimethylsulfoxide, and significantly different than those in methanol, in which there is hydrogen bonding. Similar studies were also carried out for the anions in another IL, 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), in which the C2 hydrogen is present. The results for the anions are similar to those in the [BM2IM] containing ILs, in which the C2 hydrogen is methyl substituted. This suggests that substituting this hydrogen has, at most, a minor effect on the degree of hydrogen bonding in the anion-IL solvation interaction based on the infrared spectra and dynamics." @default.
- W2056519991 created "2016-06-24" @default.
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- W2056519991 date "2005-08-22" @default.
- W2056519991 modified "2023-10-18" @default.
- W2056519991 title "Vibrational spectroscopy and dynamics of small anions in ionic liquid solutions" @default.
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- W2056519991 doi "https://doi.org/10.1063/1.2000229" @default.
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