Chemistry Reference
In-Depth Information
An ionic liquid is a recyclable medium for
organic synthesis, which is one of the
pronounced characteristics of ionic liquids.
However, when an ionic liquid is used as
electrolytic medium, decomposition of the ionic
liquid itself often occurs at a counter electrode.
This is a big problem when the ionic liquid is
recycled. In the case of electrochemical
polymerization, however, this problem can be
solved using cyclic potential-scanning oxidative
polymerization. In this polymerization method,
monomer is oxidized to form polymer film,
which deposits on the electrode. Additionally,
the deposited polymer itself is oxidized and
reduced repeatedly during alternately anodic
and cathodic scanning. During reduction at the
working electrode, anodic oxidative
polymerization of monomer and oxidation of
the polymer itself (so-called doping) therefore
occur at the counter electrode, while during
oxidation at the working electrode, reduction of
the polymer (so-called dedoping) occurs at the
counter electrode, hence decomposition of the
ionic liquid does not occur. Ionic liquid is
therefore easily recovered simply by extracting
the remaining monomer with appropriate
solvents, and recovered ionic liquid can be used
many times [68,69].
6.8.6.4 Others
Although the following synthetic application of
ionic liquids is not for organic substances,
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