host molecule anchored onto the substrate. The cavity produced by the cyclobis
(paraquat- p-phenylene) is also suitable for other hydroquinone-based molecules
such as dihydroxyphenyl acetic acid, dopamine and adrenaline. The specificity of
the assemblies can be manipulated by using different molecular linkers. For example, a higher generation cyclophane, cyclobis (paraquat- p-biphenylene) will result in a host assembly for bishydroxymethylferrocene [191].
Guo and co-workers have synthesized trioctyl phosphine oxide (TOPO) stabilized
iron nanoparticles by the microemulsion method with an average diameter of 3
nm [192]. The amorphous particles are known to effectively catalyze reactions such
as the decomposition of H 2 O 2 . A specific advantage of this method is that the
presence of O 2 does not hamper the electrocatalytic currents obtained for H 2 O 2 .
Gold colloids capped with a mixed monolayer of alkylthiol and amidoferrocenylO
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
Oligocation
Anionic
colloid
+
+
+
+
+
+
+
+
3
3 3 3
+
+
+
+
3
3
3
3
3
3
3
3
+
+
+
+
3
3 3 3
3 3
+
+
+
+
3
3
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
Scheme 20.4. Method for the construction of
oligocation–crosslinked Au–nanoparticle
multilayers by electrostatic interactions. The
first nanoparticle layer is formed by the
interaction of a nanoparticle solution with an
amine-functionalized surface. (Adapted from
Chem. Commun., 2000, 1025).
20 Electrochemistry with Nanoparticles
676
(paraquat- p-phenylene) is also suitable for other hydroquinone-based molecules
such as dihydroxyphenyl acetic acid, dopamine and adrenaline. The specificity of
the assemblies can be manipulated by using different molecular linkers. For example, a higher generation cyclophane, cyclobis (paraquat- p-biphenylene) will result in a host assembly for bishydroxymethylferrocene [191].
Guo and co-workers have synthesized trioctyl phosphine oxide (TOPO) stabilized
iron nanoparticles by the microemulsion method with an average diameter of 3
nm [192]. The amorphous particles are known to effectively catalyze reactions such
as the decomposition of H 2 O 2 . A specific advantage of this method is that the
presence of O 2 does not hamper the electrocatalytic currents obtained for H 2 O 2 .
Gold colloids capped with a mixed monolayer of alkylthiol and amidoferrocenylO
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
OOO
Si
NH
Oligocation
Anionic
colloid
+
+
+
+
+
+
+
+
3
3 3 3
+
+
+
+
3
3
3
3
3
3
3
3
+
+
+
+
3
3 3 3
3 3
+
+
+
+
3
3
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
Scheme 20.4. Method for the construction of
oligocation–crosslinked Au–nanoparticle
multilayers by electrostatic interactions. The
first nanoparticle layer is formed by the
interaction of a nanoparticle solution with an
amine-functionalized surface. (Adapted from
Chem. Commun., 2000, 1025).
20 Electrochemistry with Nanoparticles
676