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Fig. 3.11
X-ray crystal structure of 1D polymers based on the coordination of
a
unsubstituted
Q[5]/Ca
2
+
in the presence of Hyb;
b
CyH
5
Q[5]/Na
+
;
c
CyH
5
Q[5]/Ba
2
+
in the presence of Hyq;
d
CyH
5
Q[5]/La
3
+
in the presence of [ZnCl
3
H
2
O]
−
anions. The possible interactions between;
e
Q[
n
] molecules and aromatic organic molecules; and
f
Q[
n
] molecules and [M
trans
Cl
x
]
n
−
anions
of the neighboring CyH
5
Q[5] molecule. Moreover, the [ZnCl
3
H
2
O]
-
anions are
distributed around the CyH
5
Q[5]/K
+
-based 1D coordination polymer [
29
,
30
].
Figure
3.11
shows several typical cases of 1D coordination polymers con-
structed from Q[5]s and metal ions in the presence of organic molecules or inor-
ganic molecules, which behave as structure inducers. Generally, these molecules
closely accompany the polymers. Therefore, interactions between inducers with
components in the polymers, such as Q[
n
]s and metal ions, could be important
driving forces leading to the formation of Q[
n
]-based supramolecular polymers.
Chen and Yamauchi explored the chemical behavior of the convex outer walls of
Q[
n
], and found that the convex glycoluril backbones of Q[
n
] displayed a much
higher affinity to aromatic rings. Their analysis of the stacking of Q[5] and organic
molecules revealed that the aromatic molecules are always arranged between
two Q[5] molecules. Moreover, the aromatic plane of the organic molecules is
roughly parallel to one of the five-membered rings of glycoluril in the adjacent
Q[5]s. This parallel orientation appears to reflect the presence of
ˀ
-
ˀ
stacking
and C-H
ˀ
interactions. Therefore, the formation of such coordination polymers
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