Chemistry Reference
In-Depth Information
CONHR
CONHR
COOH
RHNOC
HOOC
COOH
i)
SOCl
2
or (COCl)
2
RNH
2
ii)
RHNOC
CONHR
HOOC
COOH
CONHR
COOH
i)
SOCl
2
or (COCl)
2
i)
EDC/HOBt
RNH
2
ii)
ii)
ROH
COOR
CONHR
COOR
ROOC
RHNOC
CONHR
ROOC
RHNOC
COOR
CONHR
COOR
CONHR
Fig. 15 Amidation and esterification reaction on CNTs after oxidative treatment
Fig. 16 Synthesis of a water-
soluble single-walled carbon
nanotube poly
(
m
-aminobenzene sulfonic
acid) graft copolymer
(SWCNT-PABS)
COCl
Poly(aminobenzene sulfonic acid)
O
N
SO
3
H
H
n
groups in order to enhance CNTs properties by combination with other interesting
materials. In this way, Delgado et al. first reported the synthesis of the SWCNT-
fullerene chimera and subsequent works demonstrated the ground state electronic
communication occurring from SWCNTs and C
60
moieties [
57
,
58
].
Much effort has also been made towards the preparation of novel CNTs-based
bio-conjugates for biological and bio-sensing purposes. CNTs have been covalently
linked to DNA, proteins, enzymes (Fig.
17
), and antibodies [
59
-
63
].
Simplicity and reliability of the amidation strategy have inspired the covalent
attachment of an extended amount of molecules on CNTs (dendrimers, porphyrins,
fluorescent probes, crown ethers, gold nanoparticles, etc.), making this approach
one of the most representative of CNT covalent chemistry [
64
-
69
].
An alternative to the amidation reaction is represented by the esterification of
the carboxyl functions. Also in this case carboxylic acids are rendered suitable for
