Organic Electrosynthesis - Fundamentals and Applications of Organic Electrochemistry - page 227

electroconductivity, while poly(hydrogen
fluoride) salt ionic liquids exhibit rather good
electroconductivity regardless of cation ( Table
6.4 ). 1-Ethyl-3-methylimidazolium (emim) salts
show the highest electroconductivity at room
temperature among the series of ionic liquids.
Furthermore, since the electroconductivity of
ionic liquids is correlated with the mobility of
ions, it greatly depends on the viscosity of ionic
liquids. Accordingly, the molecular design of
ionic liquids with low viscosity is of great
importance. Aliphatic ammonium ionic liquids
exhibit lower conductivity since they generally
have a higher viscosity compared to
imidazolium ionic liquids. In contrast, ionic
liquids with poly(hydrogen fluoride) as the
anion have extremely low viscosity, and
therefore have good low-temperature

properties.

Table 6.3 Physical and electrochemical
properties of imidazolinium salt ionic liquids at
25°C

Ionic liquid Melting

point
(°C)

Density
(g
cm −1 )

Viscosity
(mPa)

Conductivity
(mS cm −1 )

[emim]AlCl 4 8 1.29 18 22.6