Chemistry Reference
In-Depth Information
FIGURE 6.4
Dendrimer
11
resulting from the reaction of
10
(1 equiv.) with C
60
(64 equiv.) in
MeCN/PhMe at
30
C.
investigated and compared to the behavior of an isoabsorbing model mixture of
authentic [
]
carboxylate. Upon
excitation of the latter model mixture, in the UV-region where the main part of the
light is absorbed by the dendritic wedges of the octa-cationic moiety [
12
]Br
8
and the t-butyl ester derived from the [
13
]
8
þ
, the
characteristic emission of the polybenzyl aryl ether dendritic wedges is observed. In
contrast, complete quenching of this emission of [
12
]
8
þ
is observed in [
]
8
,
which suggests that upon excitation intramolecular energy transfer occurs from the
lowest singlet excited state of the Frechet-type dendritic branch to the low lying
fullerene singlet excited state.
12
12
][
13
