Chemistry Reference
In-Depth Information
Figure 6.19
Relationship between cationic
moieties of ionic liquids and physical properties
(viscosity,
melting
point
and
electroconductivity)
6.8.3 Polarity of Ionic Liquids
The polarity of ionic liquids can be estimated by
the energy difference, between the ground
state and the excited state of Reichrdt dye,
which is commonly used for the polarity
evaluation of ordinary solvents. The polarity of
imidazolium ionic liquids and pyridinium ionic
liquids is similar to that of ethanol, and is a
little lower than that of methanol. However,
their polarity is much higher than that of MeCN
and DMF, therefore it is equivalent to that of
protic solvents. The polarity of ionic liquids and
organic solvents can be illustrated as follows:
Search WWH ::
Custom Search