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S
S
Ni
N
N
Ni(OAc)
2
Pd(OAc)
2
N
N
Ni
S
S
16
S
S
S
S
Pd
Zn
N
N
N
N
Pd(OAc)
2
N
N
N
N
Pd
Zn
S
S
S
S
17
18
Scheme 5.8 Transmetallations involving dinuclear helicates 16-18.
Figure 5.20 shows the characteristic CH
2
region of the
1
H NMR spectra of a 1 : 1 mix-
ture of the dinickel helicate
16
and the dizinc helicate
17
(including traces of the trinu-
clear species) 30min (Figure 5.20a) and 18 h (Figure 5.20b) after dissolving the two
complexes in DMF-
d
7
. The first spectrum (Figure 5.20a) is dominated by the resonances
[Ni
2
(N,S^N,S)
2
]
[Zn
2
(N,S^N,S)
2
]
[NiZn(N,S^N,S)
2
]
[Zn
3
(N,S^N,S)
3
]
a
b
4.30
4.20
4.10
4.00
3.90
3.80
3.70
3.60
ppm
1
Figure 5.20
The CH
2
resonance signals in the
H NMR spectra of a 1 : 1 mixture of 16 and 17
after (a) 30min and (b) 18 h in DMF-
d
7
.
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