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Ultrafast dynamics of pyrrolidinium cation ionic liquids
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Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

Log-log plots of Kerr transients for (a) , (b) , (c) , (d) , and (e) . Triexponential fit functions are also shown in the figure.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

Fourier-transform frequency power spectra of (a) , (b) , (c) , (d) , and (e) . The contribution of the picosecond relaxation was subtracted.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

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).


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Table I.

Triexponential fit parameters for diffusive Kerr transients of pyrrolidinium ionic liquids.

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Table II.

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.

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Table III.

Formula weight , density , formula volume , and viscosity of the five pyrrolidinium ionic liquids.

Generic image for table
Table IV.

Brownian oscillator fit parameters for the low-frequency power spectra of the pyrrolidinium ionic liquids.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ultrafast dynamics of pyrrolidinium cation ionic liquids