Chemistry Reference
In-Depth Information
FIGURE 6.14
Liquid-crystalline fullerene-OPV conjugates.
C
60
moiety from external contacts. With this idea in mind, two series of fulleroden-
drimers have been prepared (Figure 6.15) [24,51,52]. In the design of these com-
pounds, it was decided to attach poly(aryl ether) dendritic branches terminated with
peripheral triethyleneglycol chains to obtain derivatives soluble in a wide range of
solvents [24,51,52]. The photophysical properties of
have been studied in
different solvents (PhMe, CH
2
Cl
2
, and CH
3
CN). The lifetimes of the lowest triplet
excited states are summarized in Table 6.2.
For both series of dendrimers interesting trends can be obtained from the analysis
of triplet lifetimes in air-equilibrated solutions [51,52]. A steady increase of lifetimes
is found by increasing the dendrimers size in all solvents, suggesting that the dendritic
wedges are able to shield, at least partially, the fullerene core from external contacts
31
-
38
FIGURE 6.15
Fullerodendrimers
31
-
38
.
