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Fig. 3.3
X-ray crystal structures of a 1D polymer through direct coordination of [6] molecules
and Cu
2
+
−
anions
a
side view and
b
top view; Cu
2
+
cations in the presence of NO
3
cations in the
−
presence of Cl
anions
c
side view, and
d
top view
Fig. 3.4
X-ray crystal structures of the [{Nd(NO
3
)(H
2
O)
4
}
2
(NO
3
@Q[6])][Nd(NO
3
)
6
]
n
coordi-
nation polymer
shows pseudohexagonal packing of polymeric chains that consist of Q[6] mole-
cules linked via pairs of neodymium cations bound to portal carbonyl groups (see
Fig.
3.4
) [
12
]. In this arrangement, each Q[6] molecule is thus coordinated to four
Nd
3
+
ions, with each Nd
3
+
bound to two Q[6] molecules (by one carbonyl group
from one Q[6] molecule and two carbonyl groups from the adjacent Q[6] mole-
cule). Each Nd
3
+
site also binds to four water molecules and a bidentate nitrate
anion so that each metal center is again nine-coordinate. [Nd(NO
3
)
6
]
3
−
counter
ions are located between the polymeric [{Nd(NO
3
)(H
2
O)
4
}
2
(NO
3
@Q[6])]
3
+
chains.
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