Page 210 - Environmental Nanotechnology Applications and Impacts of Nanomaterials

Reactive Oxygen Species Generation on Nanoparticulate Material 195

Figure 5.26 A molecular model
representation of C 60 trapped in a
zeolite cage [84].

of singlet oxygen (Eq. 102) [85]. The fused core area can be correlated
to the triplet C 60 and singlet oxygen quantum yields (Figures 5.27 and
5.28) [86].
However, since the ratio of quantum yields ( / T ) is approximately
unity for all different functional groups, the nature of the addend does
3
not hinder the ability of oxygen to quench the C 60 via a type II mecha-
nism (Eq. 94) [85, 86].
All the photosensitization properties of functionalized fullerene
were first measured in nonpolar solvent in order to accurately gauge
the induced changes with increasing addends. Nonetheless, these
modifications were originally intended for increased water solubility

RR RR RR

R R R
R R R
C 60 1 2 3
R = CO R
2
RR RR RR RR

R R R R R R R R
R R R R R R R R R R

RR RR RR
4a 4b 5 6
Figure 5.27 Common examples of increasingly functionalized C 60 [86].