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OH
OH
O
NH
[TiO(acac) 2 ]or
[Ga(acac) 3 ]
Me 4 NOH
[TiO(acac) 2 ]or
[Ga(acac) 3 ]
KOH
HN
O
HO
HO
11
Figure 4.7 Structural interconversion of [M 2 (11) 3 ] helicates and supramolecular [M 4 (11) 6 ]
capsules by host-guest interactions (X-ray crystal structure analyses, H atoms, solvent mole-
cules, and counter ions omitted).
HO
OH
N
N
binding site for a
d-block metal ion
(Zn II , Fe II , Co II ,
Co III ,Cr II ,Cr III )
binding site for a
d-block metal ion
(Zn II ,Fe II )
N
N
N
O
N
N
N
N
binding site for a
lanthanide ion
(La, Ce, Pr, Nd,
Sm, Eu, Tb, Lu)
binding site for a
lanthanide ion
(La, Ce, Pr, Nd,
Sm, Eu, Gd, Tb,
Tm, Yb, Lu)
N
N
N
N
N
N
12
13
Et
Et
N
O
binding site for a
lanthanide ion
N
N
N
N
binding site for
a zinc ion
N
N
N
N
binding site for a
lanthanide ion
N
N
N
14
[LaCo( 13 ) 3 ] 6+
Figure 4.8 Sequence selective formation of di- and trinuclear helicates containing d- and f-
block metal ions from ligands 12-14 carrying different metal binding sites. The structure of
[LaCo(13) 3 ](ClO 4 ) 5.5 (OH) 0.5 is given as an example (X-ray crystal structure analysis: H atoms,
solvent molecules, and counter ions omitted).
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