Ren, Z and Ivanova, AS and Couchot-Vore, D and Garrett-Roe, S
(2014)
Ultrafast structure and dynamics in ionic liquids: 2D-IR spectroscopy probes the molecular origin of viscosity.
Journal of Physical Chemistry Letters, 5 (9).
1541 - 1546.
Abstract
The viscosity of imidazolium ionic liquids increases dramatically when the strongest hydrogen bonding location is methylated. In this work, ultrafast two-dimensional vibrational spectroscopy of dilute thiocyanate ion ([SCN] -) in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C4C1im][NTf2]) and 1-butyl-2,3- dimethylimidazolium bis(trifluoromethylsulfonyl)imide ([C4C 1C12im][NTf2]) shows that the structural reorganization occurs on a 26 ± 3 ps time scale and on a 47 ± 15 ps time scale, respectively. The results suggest that the breakup of local ion-cages is the fundamental event that activates molecular diffusion and determines the viscosity of the fluids. © 2014 American Chemical Society.
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| Item Type: |
Article
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| Status: |
Published |
| Creators/Authors: |
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| Date: |
1 May 2014 |
| Date Type: |
Publication |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Journal or Publication Title: |
Journal of Physical Chemistry Letters |
| Volume: |
5 |
| Number: |
9 |
| Page Range: |
1541 - 1546 |
| DOI or Unique Handle: |
10.1021/jz500372f |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Dietrich School of Arts and Sciences > Chemistry |
| Refereed: |
No |
| Date Deposited: |
17 Apr 2014 19:49 |
| Last Modified: |
22 Jun 2021 12:55 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/21225 |
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