Chemistry Reference
In-Depth Information
degradation was evidenced. After purification by column chromatography on SiO
2
followed by gel permeation chromatography, compound
58
(Figure 6.22) was isolated
in 24% yield.
Having shown that the construction of dendrimers containing multiple C
60
subunits is successful, the next challenge was to prepare fullerene-rich nanostructures
with newproperties.With this idea inmind, dendrimer
with a bis(1,10-phenanthro-
line)copper(I) core has been prepared from fullerodendron
59
49
(Figure 6.23) [74].
appears inaccessible to external contacts as shown by
molecular modeling and confirmed by electrochemical investigations [75]. Effec-
tively, the bulky fullerodendrons around the Cu center prevent its approach on the
electrode surface and its oxidation could no longer be observed. Furthermore, due to
the high number of fullerene subunits in
The central core in
59
, a strong shielding effect is observed and
only a small part of the incident light is available to the central core relative to the
periphery. Aphotophysical study revealed that the small portion of light energy able to
reach the central Cu(I) complex is returned to the external fullerenes by energy
59
FIGURE 6.22
Fullerene-rich dendrimer
58
.
