Chemistry Reference
In-Depth Information
O
m
n
n
O
O
O
O
O
N
N
O
Hex
S
O
O
p
Hex
O
S
O
24
n = 25, m = 2-10, p = 26
23
OC
8
H
17
C
8
H
17
O
n
n
S
S
S
O
x
y
n
O
S
C
6
H
13
O
7
O
O
O
O
O
O
25
26
27
Fig. 9 Fullerene-containing polymers used in organic photovoltaic devices
PCBM with fullerene bis-adduct 27 as acceptor in an inverted bulk heterojunction
cell with architecture ITO/ZnO/26/P3HT:27/PEDOT:PSS/Ag gave rise to the
impressive value of 6.22% of efficiency, which retains 87% of the magnitude of
its original PCE value after being exposed to ambient conditions for 21 days [
116
].
4 Supramolecular Chemistry of Fullerenes
The examples of covalent modification of fullerenes we have seen so far imply the
saturation of at least one of the double bonds of the polyenic structure. This might
be beneficial or detrimental for the application in mind. Alternatively, the chemist
can choose to interact with the fullerenes or their derivatives in a supramolecular
fashion, making use of weak noncovalent interactions. In the following we will very
briefly review some of the most important advances in H-bonded fullerene
assemblies as well as the host-guest chemistry of fullerenes, organized according
to the main type of noncovalent interaction present in the associates.
