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extraction, which is one of the big advantages of
ionic liquids.
Table 6.1 Hydrophobic and hydrophilic
properties of imidazolinium salt ionic liquids
Ionic liquid
Property
[emim]BF 4
Hydrophilic
[bmim]PF 6
Hydrophobic
[bmim]BF 4 Hydrophilic
[emim](CF 3 SO 2 ) 2 N Hydrophobic
[bmim](CF 3 SO 2 ) 2 N Hydrophobic
[bmim]CF 3 SO 3
Hydrophilic
[emim]CH 3 OSO 3 Hydrophilic
[emim]CF 3 SO 3
Hydrophilic
[emim]NO 3
Hydrophilic
In the case of the widely used imidazolium ionic
liquids, the relationship between their
molecular structures and physical properties,
such as melting point, viscosity and
electroconductivity, is as follows.
With increasing alkyl chain length the
viscosity increases while the melting point
and electroconductivity decrease. However,
the relationship between melting point and
alkyl chain length is not always observed, as
shown in Figure 6.18 . In order to decrease
the melting point an unsymmetrical or bulky
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