Chemistry Reference
In-Depth Information
anomalies related to the magnetic phase transformation. Thus, for polycrystalline [Mn(hfac)
2
L
12
]
6
,the
dependence of magnetization on the magnetic field is well described with the Brillouin function with S
=
12; that is, despite the large value of S, the substance behaves as an ordinary paramagnet in the temperature
range 5 - 300 K.
78
The methodological approach suggested in
51
and leading to coordination of the nitroxyl group was also
applicable to the synthesis of layered polymeric heterospin complexes based on metal bischelates with spin
labeled deprotonated
-diketones
83-86
and enaminoketones.
87,88
The scheme that shows the formation of
a layered structure for bichelates with nitroxides based on the piperidine and imidazolidine heterocycles
Cu(L
18
β
)
2
and Co(L
19
)
2
, respectively, is depicted in Scheme 13.10. These compounds are synthesized under
CF
3
F
3
C
CF
3
O
F
3
C
O
CF
3
O
O
Cu
N
O
O
O
F
3
C
N
O
Cu
O
O
CF
3
CF
3
N
N
F
3
C
F
3
C
O
O
Cu
O
N
CF
3
O
O
O
Cu
N
O
O
F
3
C
O
CF
3
O
F
3
C
CF
3
F
3
C
[Cu(fhac)
2
]
4
(L
6
)
2
F
F
F
F
F
F
F
F
F
NN
F
O
O
H
2
N
NH
2
Hg
Hg
F
F
NH
2
NH
2
H
2
N
H
2
N
Hg
Hg
Ni
Ni
N
N
N
N
N
O
O
N
F
F
H
2
N
Hg
Hg
NH
2
F
F
F
F
F
F
F
F
F
F
[Ni
2
en
4
L
11
]
3+
Hg
6
(C
6
F
4
)
6
L
12
Scheme 13.7
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