Chemistry Reference
In-Depth Information
Fig. 12 First fullerene
containing supramolecular
donor-acceptor dyad
Fig. 13 Donor-acceptor dyads with different H-bonding motifs
intracomplex photoinduced electron transfer process leads to a radical pair species
(C
60
-ZnPc
+
) with a remarkable lifetime in the region of microseconds (Fig.
12
).
Since that, a plethora of donor-acceptor dyads in which the acceptor unit is a
fullerene C
60
have been studied. These studies have revealed that a strong elec-
tronic communication is found through the supramolecular ensembles. That is the
case for dyad 35 (Fig.
13
)[
130
], formed by a two point amidinium-carboxylate
bonding motif which gives rise to an extraordinarily high affinity, with a
K
a
value
up to 10
7
M
1
in toluene. The strong electronic coupling (36 cm
1
) facilitates the
formation of a long-lived radical pair with a lifetime of ~1
s in THF.
Dyads 36 and 37 employ a three point guanosine-cytidine couple to form
fullerene based hybrids with a porphyrin or phthalocyanine respectively. While
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