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improve optical and electronic properties. Again, the scaffolding
of a terthiophene unit can be achieved by taking advantage of the
self-assembly of the guanosine derivative
6
into highly directional
hydrogen-bonded networks.
Figure 4.18
Top: the TEMPO unit. Bottom left: cartoon showing the
electron spin-spin exchange interactions directed by the
D 4
-symmetric octameric assembling of TEMPO-1b. Bottom
right: ESR spectra of TEMPO
-1a (a) before and (b) after
2
KPic extraction.
Reversible interconversion allows switching between ribbons
and
quartet-based
assemblies
in
solution.
The
self-assembly
of
(Chart 4.4) on surfaces leads to large lamellae of straight
ribbons, ultimately forming 1D conjugated arrays as prototypes of
supramolecular nanowires (Fig. 4.19) [36].
6
O
H
N
O
N
S
O
N
S
S
N
NH 2
9
O
O
O
6
Chart 4.4
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