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Ultrafast structure and dynamics in ionic liquids: 2D-IR spectroscopy probes the molecular origin of viscosity

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.

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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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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Ren, Zzhr3@pitt.eduZHR3
Ivanova, AS
Couchot-Vore, D
Garrett-Roe, Ssgr@pitt.eduSGR0000-0001-6199-8773
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: 18 Jun 2019 20:55
URI: http://d-scholarship.pitt.edu/id/eprint/21225

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