Chemistry Reference
In-Depth Information
FIGURE 6.1
Dendrimers
1
-
3
used for the complexation of C
60
.
solvents with CTV derivatives are typically quite low [10]. This may be related to the
fact that only a small part of the C
60
surface is actually in contact with the cavity of the
macrocyclic CTV receptor. Based on the results obtained with dendrimers
, CTV
derivatives bearing polybenzyl ether dendrons should actually provide an internal
cavity capable of interacting with the main part of the fullerene's surface. Therefore,
one can expect that the surrounding dendritic branches will be able to increase the
inclusion abilities of the CTV central core for fullerenes. Dendritic CTV derivatives
4
1
-
3
(Figure 6.2) have been prepared and their inclusion abilities for C
60
systemat-
ically investigated [12].
The formation of host-guest complexes between C
60
and
-
7
was shown by the
continuous changes observed in the UV-vis spectra upon successive additions of the
host to C
60
solutions [10]. Treatment of the titration data with the Benesi-Hildebrand
equation gave the association constants values reported in Table 6.1. For all the
4
-
7
