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Section: 6 | Properties of Ionic Liquids |
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John R. Rumble, ed., CRC Handbook of Chemistry and Physics, 103rd Edition (Internet Version 2022), CRC Press/Taylor & Francis, Boca Raton, FL.
If a specific table is cited, use the format: "Physical Constants of Organic Compounds," in CRC Handbook of Chemistry and Physics, 103rd Edition (Internet Version 2022), John R. Rumble, ed., CRC Press/Taylor & Francis, Boca Raton, FL.

PROPERTIES OF IONIC LIQUIDS

Eugene Paulechka and Chris Muzny

Ionic liquids are a class of organic salts with melting points below 100 °C. Many of these salts are liquid at room temperature. This table lists four thermophysical properties for 153 ionic liquids. Column definitions for the table are as follows.

Column heading Definition
Name Systematic name of organic salt
Mol. form. Molecular formula in the Hill convention
CAS Reg. No. Chemical Abstracts Service Registry Number
Mol. wt. Molecular weight (relative molar mass)
tmp Normal melting point, in °C; the notation “gl” indicates a glass–liquid transition
ρ Density at 25 °C, in g cm-3
η Viscosity at 25 °C, in mPa s
Cp Isobaric heat capacity at 25 °C in J∙K-1∙mol-1; the superscripts indicate the temperature in °C, if different from 25 °C

The original experimental data used in this table can be found in the ILThermo database (Ref. 1). The melting points, densities, and viscosities are provided if at least three independent and consistent data sources are available for a compound. A few exceptions were made if the melting point (triple-point temperature) was determined by adiabatic calorimetry. If several polymorphs that melt at different temperatures are known for a compound, the highest melting point was specified. The glass-liquid transition temperatures are those determined by differential scanning calorimetry at a typical heating rate of 10 K∙min–1.

The listed values of the thermophysical properties were critically evaluated using the NIST ThermoData Engine (Ref. 2). For the heat capacity, the procedures described in Ref. 3 were additionally used to validate experimental data. Each recommended value in the table is characterized with an expanded uncertainty (level of confidence approximately 95%, k = 2) listed in parentheses. Compounds are listed alphabetically by name.

References

  1. Kazakov, A., Magee, J.W., Chirico, R.D., Paulechka, E., Diky, V., Muzny, C.D., Kroenlein, K., and Frenkel, M., NIST Standard Reference Database 147: NIST Ionic Liquids Database - (ILThermo), Version 2.0, National Institute of Standards and Technology, Gaithersburg, MD, 2016, <ilthermo.boulder.nist.gov/>.
  2. Diky, V., Chirico, R. D., Frenkel, M., Bazyleva, A., Magee, J. W., Paulechka, E., Kazakov, A. F., Lemmon, E. W., Muzny, C. D., Smolyanitsky, A. Y., Townsend, S., and Kroenlein, K., NIST Standard Reference Database 103b: ThermoData Engine - Pure Compounds, Binary Mixtures, Ternary Mixtures, and Chemical Reactions, Version 10.1,
  3. Paulechka, E., J. Phys. Chem. Ref. Data, 39, 033108, 2010. [https://doi.org/10.1063/1.3463478]
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