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Fig. 3.22 a
and
b
linear coordination polymers of
i
iQ[6] with Ca
2
+
and Sr
2
+
,
c
and
d
detailed
interactions between
i
iQ[6] and [ZnCl
4
]
2
−
anions
[
45
]. Moreover, we used
i
iQ[6] as a ligand, and investigated its interaction with
alkaline earth metal ions (AE
2
+
) in the presence of the structure directing agent,
[ZnCl
4
]
2
−
. Single-crystal X-ray diffraction analysis revealed that interaction of
i
iQ[6] with AE
2
+
(except Mg
2
+
, which has the smallest ionic radius) forms 1D
coordination polymers. Coordination of AE
2
+
to
i
iQ[6] and their supramolecular
assemblies could be influenced by the interaction of the positively charged outer
surface of
i
iQ[6] with [ZnCl
4
]
2
−
anions, that is, the outer surface interactions
of iQ[6]
n
]s [
13
]. Figure
3.22
a, b show linear coordination polymers of
i
iQ[6] with
Ca
2
+
and Sr
2
+
and Fig.
3.22
c, d show the detailed interactions between
i
Q[6] and
[ZnCl
4
]
2
−
anions.
A series of studies reported by Thuéry reveals that the uranyl ion is a very spe-
cial species in the construction of Q[
n
]-based polydimensional coordination poly-
mers. This ion may not only directly coordinate to the portal carbonyl oxygens,
but also form various uranyl-based clusters and coordinate to the portal carbonyl
oxygens, resulting in the formation of a variety of Q[
n
]-based polydimensional
coordination polymers. For example, preparation of the polydimensional coor-
dination polymers is carried out in the presence of long-chain alkyldicarboxylic
acids (HOOC-(CH
2
)
n
−
2
-COOH, denoted here as H
2
C
n
), such as H
2
C
8
or H
2
C
9
,
DMF (added to enhance solubility of higher diacids), and alkali (Li
+
) or alka-
lineearth metal ions (added in order to promote the dissolution of the cucurbituril).
The unsubstituted Q[6] interacts with uranyl (clusters) and form 2D coordination
networks [
43
]. The crystal structures of the resulting complexes, which have stoi-
chiometries of [H
2
NMe
2
]
2
{(UO
2
)
4
O
2
(OH)
2
(C8)
2
Q[6]} 8H
2
O and [H
2
NMe
2
]
2
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