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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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