Effects of Methylating Imidazolium-Based Ionic Liquids on Viscosity: New Insights from the Compensated Arrhenius Formalism

Fleshman, Allison M.; Goldman, Allison M.; Hetcher, Wesley J.; Debbert, Stefan L.; Do-Thanh, Chi-Linh; Mahurin, Shannon M.; Dai, Sheng

doi:10.1021/acs.jpcb.3c02057

Title: Effects of Methylating Imidazolium-Based Ionic Liquids on Viscosity: New Insights from the Compensated Arrhenius Formalism

Journal Article · Wed Jun 28 00:00:00 EDT 2023 · Journal of Physical Chemistry. B

DOI:https://doi.org/10.1021/acs.jpcb.3c02057· OSTI ID:2000263

^[1]; Goldman, Allison M. ^[2]; Hetcher, Wesley J. ^[2]; Debbert, Stefan L. ^[2];

^[3];

^[4];

^[5]

Lawrence University, Appleton, WI (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Lawrence University, Appleton, WI (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Methylation of the C(2) carbon on imidazolium-based room temperature ionic liquids (RTILs) causes an unexpected increase in viscosity when paired with the anion bis(trifluoromethylsulfonamide) [Tf₂N]^–, but the viscosity decreases when the methylated imidazolium is paired with a tetracyanoborate [B(CN)₄]^– anion. Herein, this paper investigates these different observations in viscosity using the compensated Arrheniusformalism (CAF) for fluidity (inverse viscosity), which assumes fluidity to be a thermally activated process. CAF activation energies are determined for imidazolium [Tf₂N]^– and methylated imidazolium [Tf₂N]^– and compared to imidazolium [B(CN)₄]^– and methylated imidazolium [B(CN)₄]^–. The results show that the activation energy increases with methylation for [Tf₂N]^–, but it decreases with methylation for [B(CN)₄]^–. The CAF results also yield information concerning the entropy of activation, which are compared for the two systems

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2000263

Journal Information:: Journal of Physical Chemistry. B, Vol. 127, Issue 27; ISSN 1520-6106

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Effects of Methylating Imidazolium-Based Ionic Liquids on Viscosity: New Insights from the Compensated Arrhenius Formalism

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