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Fig. 3.12
X-ray crystal structures of
a
the trigonal-planar branch of three Q[5] coordinated to
potassium ions (
yellow
);
b
the six-membered Q[5] “beaded” rings in a single layer with mol-
ecules of Hyb (
green
) centered over each junction. H
2
O in the channels is omitted for clarity;
c
a view of the template molecules, Hyb (
green
), between the layers;
d
the location of the I
−
ions
between the netting layers of Q[5] “beaded” ring. Adapted from Ref. [
36
] with permission from
The Royal Society of Chemistry
More recently, we demonstrated the coordination of neodymium (Nd
3
+
) cations
with cucurbit[5]uril (Q[5]) and corresponding supramolecular assemblies in the
presence of tetrachlorozincate [ZnCl
4
]
2
−
anion [
37
]. The [ZnCl
4
]
2
−
anions gave
rise to a “honeycomb effect” that resulted in the formation of Nd
3
+
/Q[5]-based
linear coordination polymers and 2D networks. X-ray crystallographic analysis of
this compound showed a 2D network (Fig.
3.14
a). Close inspection revealed that
each Q[5] coordinate with three Nd
3
+
cations (Nd1, Nd3 at one portal, whereas
Nd2 at other portal of the Q[5] molecule), each Nd1 or Nd2 coordinates to two
neighboring Q[5] molecules with similar manner: fully cover on a portal of Q[5]
molecule, and one coordination with one portal carbonyl oxygen of neighbor-
ing Q[5] molecules, resulting in the formation of 1D coordination polymers. In
addition, the coordinated Nd3 cations coordinate to neighboring Q[5] molecules
belonging to adjacent Nd/Q[5]-based linear coordination polymers, thus resulting
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