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Fig. 11 a
Chemical structures of mono functional ureidotriazene
17
and ureidopyrimid-
inone
18
derivatives and their mode of association into mesogenic dimers.
b
Bifunctional
derivatives
19
and
20
and a schematic representation of their proposed self-assembly into
main-chain supramolecular polymeric columns
the chiral mono-derivative T
M-I
is 98
◦
CwhileT
M-I
for
n
=7is147
◦
Candis
207
◦
Cfor
n
=8.
Other more complex supramolecular assemblies of disc-like architec-
tures have also been reported. For example, self-assembly around a trifunc-
tional core can yield columnar mesophases. This can be achieved by add-
ition of appropriately long chain substituted benzoic acid derivatives (
21
)
to a tris(imidazole) base (
22
) leading to the formation of a four component
supramolecular disc (
21
3
·
22
) (Fig. 12a) which exhibits columnar mesophases.
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