Chemistry Reference
In-Depth Information
COOR
Pd (II)
I
OR
O
Ar
Pd(PPh
3
)
4
/Cs
2
CO
3
Ar-boronic acid
R
N
N
N
N
3
-R
Fig. 25 Modification of functionalized CNTs by diazonium chemistry via Heck, Suzuki and click
chemistry
avoiding electrochemically induced reactions. The same reaction was successfully
performed “on water” in the presence of a substituted aniline and an oxidizing
agent [
104
].
A further variation was introduced to this approach, involving the use of ionic
liquids (imidazolium based ionic liquids) and K
2
CO
3
as reaction media, which were
ground together with SWCNTs and aryl diazonium salts in a pestle and mortar at
room temperature [
103
].
Functionalized CNT production by diazonium chemistry has been subjected to
further modification using different reactions. Campidelli and co-workers
introduced via “click chemistry” porphyrin dendrons, while iodophenyl-
functionalized CNTs have been used as precursors of Suzuki and Heck coupling
reactions [
105
-
107
]. The final derivatives are potentially useful in materials and
science applications (Fig.
25
).
Free radicals have also been generated from organic hydrazines, either by thermal air
oxidation or under microwave conditions [
108
,
109
]. The microwave-assisted approach
