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In-Depth Information
O
OH
N
N
OH
O
O
O
O
O
O
O
R
R
O
O
N
N
Fluorescent
Non fluorescent
Scheme 5.61
An interesting analysis tool for the selective detection of local water inside soft molecular assemblies
suspended in bulk water has been developed.
264
The
1
H NMR signal of water interacting with specifically
localized stable nitroxides is amplified through Dynamic Nuclear Polarization.
The quenching of fluorescence of pyrene derivatives by nitroxides has been used to investigate the
properties of different micelles.
265
The partition isotherms and exchange rates of
para
-substituted benzyl hydroxyalkyl nitroxides between
an aqueous solution and the monolayer of water soluble protected gold nanoparticles have been determined
by EPR (Scheme 5.62).
266
5.7.5 Fullerene-linked nitroxides
The synthesis and properties of fullerenes bearing nitroxide moiety(ies) have been reported in the last
decade. Electron transfer, spin coupling in di-, trinitroxide - fullerene adducts, and interactions between the
nitroxide unpaired electron and the fullerene excited triplet state have been studied (Scheme 5.63).
267 - 269
O
O
O
O
HN
HN
O
O
O
O
N
N
O
O
S
S
O
OH
O
S
O
k
1
S
N
Au
+
NITROXIDE
Au
S
k
-1
S
N
N
S
S
O
O
O
O
O
O
NH
NH
O
O
O
O
O
O
Scheme 5.62
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