Chemical structures of the pyrrolidinium cation ionic liquids used in this study. is -butyl--methylpyrrolidinium cation, is -methoxyethyl--methylpyrrolidinium cation, is -ethoxyethyl--methyl-pyrrolidinium cation, is bis(trifluoromethylsulfonyl)imide anion, is dicyanoamide anion, and is bromide anion.
Log-log plots of Kerr transients for (a) , (b) , (c) , (d) , and (e) . Triexponential fit functions are also shown in the figure.
Plots of the slow relaxation time constant for the five pyrrolidinium ionic liquids. Squares, triangles, and circles represent points calculated using the molecular volumes of the anion, cation, and the sum of cation and anion, respectively.
Fourier-transform frequency power spectra of (a) , (b) , (c) , (d) , and (e) . The contribution of the picosecond relaxation was subtracted.
Multimode Brownian oscillator fits to the intermolecular spectrum of from 0 to . The bottom figure presents the best fit using three Brownian oscillators, the middle figure the best fit with two Brownian oscillators, and the residuals for both fits are shown at top.
Low-frequency power spectra of (a) , (b) , (c) , (d) , and (e) (bold dotted lines). Entire fit curves (solid lines) and each Brownian oscillator fits (small dotted, short dashed, and long dashed lines) are also shown. Intramolecular modes are also fitted by a Lorentzian function (dot-dash lines).
Triexponential fit parameters for diffusive Kerr transients of pyrrolidinium ionic liquids.
Intramolecular vibrational band frequencies observed in Fourier-transform Kerr spectra of ionic liquids. In the Assignment column, denotes an anion vibration and a cation vibration.
Formula weight , density , formula volume , and viscosity of the five pyrrolidinium ionic liquids.
Brownian oscillator fit parameters for the low-frequency power spectra of the pyrrolidinium ionic liquids.
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