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Fig. 3.2
X-ray crystal structures of a 1D polymer formed through direct coordination of Q[6]
molecules.
a
Ca
2
+
cations;
b
Na
+
cations;
c
K
+
cations;
d
Rb
+
cations;
e
honeycomb-like
arrangement of the Q[6]/Rb
+
coordination polymers and
f
a large hexagonal channel with a
mean diameter of about 10 Å constructed from the Q[6]/Rb
+
coordination polymers. Rb
+
cations
are omitted for clarity in Fig. 3.2e, f
coordination polymer was formed through coordination of each copper(II) ion
with two terminal carbonyl groups from two adjacent cucurbiturils (Fig.
3.3
a, b).
The assembly of a cucurbituril-based coordination polymer occurs through inter-
actions with the weak-field ligand, Cl
−
. The tubular structure is formed from three
copper(II) ions linked to six carbonyl groups from two adjacent cucurbiturils,
three of which derive from one cucurbituril unit and the remaining alternating
groups from the adjacent one (Fig.
3.3
c, d).
Under hydrothermal conditions (at 120 °C) Nd(NO
3
)
3
reacts with Q[6] in water
to yield Polymeric [{Nd(NO
3
)(H
2
O)
4
}
2
(NO
3
@Q[6])][Nd(NO
3
)
6
]
n
. Its structure
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