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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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