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2 Ag
+
2
62
(
P
)-[Ag
2
(
62
)
2
]
2+
3 Ag
+
3
63
(
M
)-[Ag
3
(
63
)
3
]
3+
2 Cu
+
2
64
[Cu
2
(
64
)
2
]
2+
Figure 4.27 Amino acid-derived bis(oxazoline) ligands 59-61 and their diastereoselective
self-assembly to optically pure dinuclear double-stranded silver(I) and copper(I) helicates (P)-
[Ag
2
(62)
2
]
2þ
and [Cu
2
(64)
2
]
2þ
and circular trinuclear silver(I) helicate (M)-[Ag
3
(63)
3
]
3þ
(X-ray
crystal structure analyses, H atoms, solvent molecule, and counter ions omitted).
achieved with chiral
P
-donor ligands and, in fact, in the examples published by the group
of S.B. Wild the chiral information is located directly at configurationally stable tertiary
phosphine atoms, as depicted in Figure 4.28 [67]. However, besides double-stranded heli-
cal complexes with copper(I), silver(I), and gold(I) ions, non-helical side by side stereo-
isomers were also formed in most cases.
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