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Ionic liquid Electroconductivity (mS
cm
−1
)
Me
4
NF-4HF
196.6
Et
4
NF-4HF
99.2
n
-Pr
4
NF-4HF 33.6
Et
3
N-3HF
32.6
[emim]H
2.3
F
3.3
100
In the relationship between the molecular
structure and conductivity of imidazolium ionic
liquid, viscosity increases with increase in
bulkiness of the
N
-alkyl group attached to the
imidazolium ring, resulting in a drastic
decrease in electroconductivity. On the other
hand, even though the
N
-alkyl group is replaced
with a hydrogen atom, which is smaller than the
methyl group, the viscosity increases owing to
hydrogen bonding with the counter anion. The
conductivity is therefore not improved. The
Walden role, in which the product of mobility
and viscosity is constant, can be applied to ionic
liquids, and molar electroconductivity against
viscosity of ionic liquids obeys the following
equation:
Accordingly, the conductivity of ionic liquids
increases with decreasing viscosity. It is
reasonable that the viscosity changes depending
on temperature, and the electroconductivity of
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