Chemistry Reference
In-Depth Information
Fig. 3.23
X-ray crystal structure of tetranuclear UO
2
clusters linked by
a
C8 and
b
C9; X-ray
crystal structure of a 2D network of Q[6]/UO
2
clusters linked by
c
C8 and
d
C9
{(UO
2
)
4
O
2
(OH)
2
(C9)
2
Q[6]} 5H
2
O are closely related, since both of them con-
tain similar tetranuclear UO
2
2
+
clusters held by two
ʼ
3
-oxo and two
ʼ
2
-hydroxo
ions (Fig.
3.23
a, b). In addition, both are attached to Q[6] by uranyl-O-carbonyl
bonds to form 2D coordination polymers. Figure
3.23
b, c show such Q[6]/U
cluster
2D networks linked by C8 and C9, respectively.
An extensive investigation on inorganic molecule-induced Q[
n
]/metal coordi-
nation polymers reveals that the Cd cation is also a very special species. It can
not only directly coordinate to the portal carbonyl oxygens, but also form various
Cd-based complexes or clusters that coordinate to the portal carbonyl oxygens or
accompany Q[
n
]/metal complexes. Formation of the Cd-based complexes or clus-
ters result in the formation of a variety of Q[
n
]-based polydimensional coordina-
tion polymers. One of our recent works examined such 2D coordination polymer.
The crystal structure of the polymer reveals that there are two Cd
2
+
units held by
two
ʼ
2
-Cl ions in this assembly (Fig.
3.24
a, b) and the Q[6] molecules are linked
by these two Cd
2
+
units. These linkages result in the formation of the Q[6]/Cd
2
+
-
based 2D coordination polymers (Fig.
3.24
c). In this assembly, each Cd
2
+
ion is
hexacoordinated in three different features, and the ligand Q[6] coordinates with
three Cd
2
+
ions (for Q[6]A) or two Cd
2
+
ions (for Q[6]B). The Cd1 ion is coor-
dinated by three carbonyl oxygens (O2 from Q[6]A, and O13 and O14 from Q[6]
B), two shared chloride anions (Cl2 and Cl3), and one water molecule (O7W).
The Cd2 ion is coordinated by one carbonyl oxygen (O8 from Q[6]A), three chlo-
ride anions (Cl4, Cl1, and Cl10, the last two of which are shared), and two water
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