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Fig. 2.18
X-ray crystal structures of
a
the Ce
3
+
-Q[6] sandwich complex;
b
the 3D Ce
3
+
-Q[6]
packing in
a
showing the presence of nanochannels;
c
the Gd
3
+
-Q[6] triple-decker sandwich
complex
Fig. 2.19
X-ray crystal structures of Ln
3
+
-Q[6] assemblies:
a
hydrogen-bonded host-guest
assembly of two [Gd(H
2
O)
7
NO
3
]
2
+
cations with Q[6] which encapsulates a pyridine molecule
in its cavity;
b
a La
3
+
-Q[6] complex incorporating an encapsulated pyridine molecule (pyridine
encapsulation occurs for half the complexes while the other half encapsulate a water molecule);
the La
3
+
site is disordered between each portal (both positions shown);
c
La
3
+
-Q[6] complex
incorporating an encapsulated tetrahydrofuran molecule
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