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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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