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cation should be used, which results in a
weak columbic interaction between cation
and anion.
Figure 6.18
Relationship between alkyl
chain length of imidazolinium salt ionic
liquids and physical properties (viscosity,
melting point and electroconductivity)
When a methyl group is introduced to the
2-position of the imidazolium ring,
hydrogen bonding at the 2-position cannot
occur. The melting point does not decrease
unexpectedly but increases. Thus, the
relationship between hydrogen bonding and
melting point has not yet been clarified.
When an alkyl group is introduced to the
2-position of the imidazolium ring, the
reduction of the ring becomes difficult but
oxidation becomes easier. Moreover, when
the imidazolium ion as cation is changed to
an aliphatic ammonium ion, the oxidative
resistance increases, and the viscosity and
melting point also increase. Regarding the
viscosity, imidazolium ionic liquids have the
lowest viscosity among various types of ionic
liquids at the present time (
Figure 6.19
).
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