Chemistry Reference
In-Depth Information
Figure 7.26
Molecular structure of the octadecylthio TTF-diamide organogelator.
118
(a) Optical microscope image of the rod-like appearance of the neutral
xerogel. (b) and (c) SEM and optical images of the doubly coiled
structure of the ClO
4
-
-doped xerogel, respectively.
(Reproduced with permission from the RSC.)
was confirmed for a ClO
4
-
-doped nanofibre, with a thermal activation energy
value of 0.108 eV.
Recently, the gelation ability and the modulation of the conductivity values
of four different TTF-based xerogels was reported
119
(Figure 7.27). The authors
designed organogelators with two different gel-forming segments, one con-
taining a tridodecyl oxy-phenyl substituent or a cholesteryl group. Moreover,
one or two TTF moieties were incorporated in the molecular structure of the
gelator (Figure 7.27). From the four distinct TTF-based organogelators, higher
conductivity values were determined for the two TTF-derivatives incorporating
two TTF moieties. In these samples, the conductivity values were one order of
magnitude higher than that of the doped xerogels incorporating only one TTF
moiety (from 2-4
10
-5
Scm
-1
to 2-4
10
-4
Scm
-1
). Furthermore, the better
gelation performance was described by the TTF organogelators with a cho-
lesteryl side group, independently of the number of TTF moieties, presumably
on account of the higher rigidity of this group as compared to the tridodecyl
oxy-phenyl substituent.
