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Fig. 3.24
X-ray crystal structures of
a
and
b
two different Cd
2
+
units;
c
the 2D network linked
by complexation of Cd
2
+
units. A detailed view of the coordination of
d
Cd1
2
+
; Cd2
2
+
; and
Cd3
2
+
with Q[6]A and
e
Cd1
2
+
with Q[6]B
molecules (O1W and O4W). The Cd3 ion is coordinated by one carbonyl oxygen
(O11 from Q[6]A), three chloride anions (Cl5, Cl2, and Cl3, the last two of which
are shared) and two water molecules (O2W and O3W). The ligand Q[6]A plays
the role of a ternary ligand donor and coordinates with three Cd
2
+
ions (Cd1, Cd2,
and Cd3), while the ligand Q[6]B plays the role of a binary ligand donor and coor-
dinates with two Cd
2
+
ions (2 Cd1), (Fig.
3.24
d, e) [
46
].
Very recently, we obtained another Q[6]-based 2D coordination polymer con-
structed from Q[6]/Na
+
-based 1D coordination polymers linked by [CdCl
4
]
2
−
anions by introducing NaCl into a Q[6]-CdCl
2
system in a HCl solution. In this
assembly, the 1D supramolecular chains (Fig.
3.25
a) and the neighboring Q[6]s
are linked by three sodium units in the tubular coordination polymers. One Na
+
cation (Na2) links two adjacent Na
+
cations (Na1) by sharing water molecules
O1W and O1W, and form a unit of three Na
+
cations (Fig.
3.25
b) [
47
]. We found
that [CdCl
4
]
2
−
or [ZnCl
4
]
2
−
may behave as structure inducer that prefers to form
honeycomb frameworks in which the linear metal-Q[
n
] coordination polymers
fill the channels of the [CdCl
4
]
2
−
or [ZnCl
4
]
2
−
honeycomb. However, in the pre-
sent work, the [CdCl
4
]
2
−
anions do not arrange within the honeycomb frame-
work; instead, they interact with Na
+
cations in the tubular coordination polymers
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