Organic Electrosynthesis - Fundamentals and Applications of Organic Electrochemistry - page 219

fluorinated hydrocarbons is an attractive
alternative which avoids these problems. For
example, supercritical fluoroform exhibits
relatively high solubility and its dielectric
constant can be controlled from 1 to 7 by
manipulating either the temperature or the
pressure of scCHF 3 without any additives like
polar solvents [28]. Supercritical fluoroform
has therefore been used as the reaction medium
in electrochemical syntheses.
Atobe et al. reported the electrochemical
synthesis of polypyrrole and polythiophene in
supercritical fluoroform [29]. Both the
corresponding monomers (pyrrole and
thiophene) can be electropolymerized faster in
supercritical fluoroform than in a conventional
organic media like acetonitrile solution, and the
films obtained have a highly uniform structure
( Figure 6.15 ).
Figure 6.15 SEM photographs of polypyrrole
films polymerized in (a) acetonitrile and (b)
supercritical fluoroform solutions