Dielectric Relaxation, Ion Conductivity, Solvent Rotation, and Solvation Dynamics in a Room-Temperature Ionic Liquid

2008 ◽  
Vol 112 (35) ◽  
pp. 11028-11038 ◽  
Author(s):  
Youngseon Shim ◽  
Hyung J. Kim
Keyword(s):  
Ionic Liquid ◽  
Dielectric Relaxation ◽  
Room Temperature ◽  
Room Temperature Ionic Liquid ◽  
Ion Conductivity ◽  
Solvation Dynamics

High Frequency Dielectric Response of the Ionic Liquid N-Methyl-N-ethylpyrrolidinium Dicyanamide

2007 ◽  
Vol 60 (1) ◽  
pp. 6 ◽  
Author(s):  
Simon Schrödle ◽  
Gary Annat ◽  
Douglas R. MacFarlane ◽  
Maria Forsyth ◽  
Richard Buchner ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Dielectric Loss ◽  
Dielectric Relaxation ◽  
High Frequency ◽  
Dielectric Response ◽  
Room Temperature ◽  
Room Temperature Ionic Liquid ◽  
Dielectric Relaxation Spectroscopy ◽  
Frequency Range ◽  
Fast Rotation

A study of the room-temperature ionic liquid N-methyl-N-ethylpyrrolidinium dicyanamide by dielectric relaxation spectroscopy over the frequency range 0.2 GHz ≤ ν ≤ 89 GHz has revealed that, in addition to the already known lower frequency processes, there is a broad featureless dielectric loss at higher frequencies. The latter is probably due to the translational (oscillatory) motions of the dipolar ions of the IL relative to each other, with additional contributions from their fast rotation.

Solute Rotation and Solvation Dynamics in a Room-Temperature Ionic Liquid

2003 ◽  
Vol 107 (24) ◽  
pp. 5926-5932 ◽  
Author(s):  
J. A. Ingram ◽  
R. S. Moog ◽  
N. Ito ◽  
R. Biswas ◽  
M. Maroncelli
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Room Temperature Ionic Liquid ◽  
Solvation Dynamics

A fluorescence study of the solute–solvent interactions of aminochalcones in a room-temperature ionic liquid

2013 ◽  
Vol 85 (7) ◽  
pp. 1451-1463 ◽  
Author(s):  
Kotni Santhosh ◽  
G. Krishnamurthy Grandhi ◽  
Snigdha Ghosh ◽  
Anunay Samanta
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Solvent Polarity ◽  
Fluorescence Decay ◽  
Room Temperature Ionic Liquid ◽  
Excitation Wavelength ◽  
Solvation Dynamics ◽  
Time Resolved ◽  
Solvent Interactions ◽  
The One

Unlike most other electron donor–acceptor (EDA) molecules, aminochalcones exhibit unusual solvent polarity-dependent fluorescence behavior. The photophysical behavior of two aminochalcones, namely, 4-aminochalcone (AC) and 4-dimethylaminochalcone (DMAC), has been studied in a viscous room-temperature ionic liquid (IL), 1-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6], by steady-state and time-resolved fluorescence techniques. The observation of a single emission band in viscous IL, which is similar to the one observed in less viscous polar conventional solvents, suggests no twisting is necessary for the formation of the charge-transfer state from which the emission of aminochalcones originates. The fluorescence decay profiles, solvation dynamics, and excitation-wavelength-dependent emission behavior of AC are found to be quite different from those of DMAC in the IL. The observed difference is attributed to specific H-bonding interaction between AC and [bmim][PF6].

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