The density, viscosity, conductivity, and heat capacity of 1-hexyl-3-methylimidazolium hexafluorophosphate ([C6mim][PF6]) and 1-hexyl-3-methylimidazolium tris(perfluoroalkyl)trifluorophosphate ([C6mim][(C2F5)3PF3]) were measured in the (293.15 to 343.15) K range. According to these experimental and estimated results, the coefficients of thermal expansion and conductivity apparently increase from [C6mim][PF6] to [C6mim][(C2F5)3PF3], while the crystal energy, the temperature dependence of the heat capacity, and viscosity greatly decrease from [C6mim][PF6] to [C6mim][(C2F5)3PF3] in the examined temperature range. These comparisons were combined to assess the effect of the replacement of three F atoms of the hexafluorophosphate anion by three hydrophobic C2F5-groups on the physicochemical properties of [C6mim][PF6] and [C6mim][(C2F5)3PF3].
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
1
Molar heat capacity at constant pressure, J/K/mol ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Liquid
Small sample (50 mg) DSC
51
POMD
1
Electrical conductivity, S/m ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Liquid
Metler Toledo SevenEasy conductivity meter
11
POMD
1
Viscosity, Pa*s ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Liquid
Concentric cylinders viscometry
11
POMD
1
Mass density, kg/m3 ; Liquid
Temperature, K; Liquid
Pressure, kPa; Liquid
Liquid
Vibrating tube method
11
POMD
2
Molar heat capacity at constant pressure, J/K/mol ; Liquid