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O
H
NH
N
N
O
N
O
O
N
N
NH
2
O
NHN
O
O
5
Chart 4.3
Figure 4.15
Left: CD spectra of
before (continuous line) and
after (dotted line) KPic extraction; right: the structure of the
octameric complex.
5
in CHCl
3
Thus, the LG supramolecular complex can be used as a scaffold
to drive in a pre-determined fashion the organization of functional
residues.
In addition, the above-mentioned different modes of self-
assembly that LGs can undergo in the presence or absence of metal
ions offer another intriguing possibility: by making use of an external
agent it is in fact possible to induce the reversible switching between
two discrete, highly ordered supramolecular motifs. Controlling a
function at the molecular level by means of external
is one of
the key requirements in the development of “smart” materials.
The G-quartet structures are harnessed by the presence of a
coordinated cation: this allows one to trigger a reversible ribbon-
stimuli
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