A major impediment limiting the widespread application of ionic liquids (ILs) is their high shear viscosity. Incorporation of a tricyanomethanide (TCM−) anion in ILs leads to low shear viscosity and improvement of several characteristics suitable for large scale applications. However, properties including interactions of TCM− with the local environment and dynamics of TCM− have not been thoroughly investigated. Herein, we have studied the ultrafast dynamics of TCM− in several imidazolium ILs using linear IR and two-dimensional infrared spectroscopy techniques. The spectral diffusion dynamics of the CN stretching modes of TCM− in all ILs exhibit a nonexponential behavior with a short time component of ∼2 ps and a long time component spanning ∼9 ps to 14 ps. The TCM− vibrational probe reports a significantly faster relaxation of ILs compared to those observed previously using linear vibrational probes, such as thiocyanate and selenocyanate. Our results indicate a rapid relaxation of the local ion-cage structure embedding the vibrational probe in the ILs. The faster relaxation suggests that the lifetime of the local ion-cage structure decreases in the presence of TCM− in the ILs. Linear IR spectroscopic results show that the hydrogen-bonding interaction between TCM− and imidazolium cations in ILs is much weaker. Shorter ion-cage lifetimes together with weaker hydrogen-bonding interactions account for the low shear viscosity of TCM− based ILs compared to commonly used ILs. In addition, this study demonstrates that TCM− can be used as a potential vibrational reporter to study the structure and dynamics of ILs and other molecular systems.
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30 April 2020
Research Article|
April 22 2020
Ultrafast vibrational dynamics of a trigonal planar anionic probe in ionic liquids (ILs): A two-dimensional infrared (2DIR) spectroscopic investigation Available to Purchase
Biswajit Guchhait;
Biswajit Guchhait
a)
1
Department of Chemistry, Colorado State University
, Fort Collins, Colorado 80523, USA
2
Department of Chemistry, School of Natural Sciences, Shiv Nadar University
, Dadri, Uttar Pradesh 201314, India
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Clara A. Tibbetts;
Clara A. Tibbetts
1
Department of Chemistry, Colorado State University
, Fort Collins, Colorado 80523, USA
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Kathryn M. Tracy;
Kathryn M. Tracy
1
Department of Chemistry, Colorado State University
, Fort Collins, Colorado 80523, USA
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Bradley M. Luther;
Bradley M. Luther
1
Department of Chemistry, Colorado State University
, Fort Collins, Colorado 80523, USA
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Amber T. Krummel
Amber T. Krummel
a)
1
Department of Chemistry, Colorado State University
, Fort Collins, Colorado 80523, USA
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Biswajit Guchhait
1,2,a)
Clara A. Tibbetts
1
Kathryn M. Tracy
1
Bradley M. Luther
1
Amber T. Krummel
1,a)
1
Department of Chemistry, Colorado State University
, Fort Collins, Colorado 80523, USA
2
Department of Chemistry, School of Natural Sciences, Shiv Nadar University
, Dadri, Uttar Pradesh 201314, India
J. Chem. Phys. 152, 164501 (2020)
Article history
Received:
December 06 2019
Accepted:
April 03 2020
Citation
Biswajit Guchhait, Clara A. Tibbetts, Kathryn M. Tracy, Bradley M. Luther, Amber T. Krummel; Ultrafast vibrational dynamics of a trigonal planar anionic probe in ionic liquids (ILs): A two-dimensional infrared (2DIR) spectroscopic investigation. J. Chem. Phys. 30 April 2020; 152 (16): 164501. https://doi.org/10.1063/1.5141751
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