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Low-Temperature Heat Capacity of Room-Temperature Ionic Liquid, 1-Hexyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide

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National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 3,1−1−1 Umezono, Tsukuba, Ibaraki 305-8563, Japan, Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan, and Structures and Materials Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
Cite this: J. Phys. Chem. B 2006, 110, 28, 13970–13975
Publication Date (Web):June 27, 2006
https://doi.org/10.1021/jp0618330
Copyright © 2006 American Chemical Society
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Abstract

Heat capacities of liquid, stable crystal, and liquid-quenched glass of a room-temperature ionic liquid (RTIL), 1-hexyl-3-methylimidazolium bis(trifluromethylsulfonyl)imide were measured between 5 and 310 K by adiabatic calorimetry. Heat capacity of the liquid at 298.15 K was determined for an IUPAC project as (631.6 ± 0.5) J K-1 mol-1. Fusion was observed at Tfus = 272.10 K for the stable crystalline phase, with enthalpy and entropy of fusion of 28.34 kJ mol-1 and 104.2 J K-1 mol-1, respectively. The purity of the sample was estimated as 99.83 mol % by the fractional melting method. The liquid could be supercooled easily and the glass transition was observed around Tg ≈ 183 K, which was in agreement with the empirical relation, Tg ≈ (2/3) Tfus. The heat capacity of the liquid-quenched glass was larger than that of the crystal as a whole. In the lowest temperature region, however, the difference between the two showed a maximum around 6 K and a minimum around 15 K, at which the heat capacity of the glass was a little smaller than that of crystal.

†

 National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology.

‡

 Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba.

*

 Corresponding author. E-mail:  [email protected]

§

 Structures and Materials Laboratory, Tokyo Institute of Technology.

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The detail is given of uncertainty estimation for the heat capacity of the liquid state at 298.15 K. This material is available free of charge via the Internet at http://pubs.acs.org.

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Get article recommendations from ACS based on references in your Mendeley library.

You’ve supercharged your research process with ACS and Mendeley!

STEP 1:
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Please note: If you switch to a different device, you may be asked to login again with only your ACS ID.

Please note: If you switch to a different device, you may be asked to login again with only your ACS ID.

Please note: If you switch to a different device, you may be asked to login again with only your ACS ID.

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You have to login with your ACS ID befor you can login with your Mendeley account.

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