Chemistry Reference
In-Depth Information
g-value
1
0 8
6
4
2
20000
20000
15000
15000
10000
10000
5000
5000
0
0
-5000
-5000
-10000
-10000
100
200
300
400
500
magnetic field B (mT)
g-value
8
7 6
5
4
3
2
15000
15000
10000
10000
5000
5000
0
0
-5000
-5000
-10000
-10000
100
150
200
250
300
350
magnetic field (mT)
Figure 29:
top: EPR-spectrum of (Q
7
)
6
[
D
-SiW
11
O
39
Fe(H
2
O)] obtained in toluene (c = 1 mM) at a
temperature of T = 95 K; radiation frequency f = 8943.7 MHz; bottom: EPR-spectrum of
(Q
7
)
5
[
D
-SiW
11
O
39
Fe(H
2
O)] obtained in toluene (c = 1 mM) at a temperature of T = 95 K; radiation
frequency f = 8943.7 MHz.
The experimental g-values of {W
11
Fe
II
} are found to be 2.024, 4.281 plus a weak signal at
8.48. This means that predominantly a spin S = 3/2 system is present, which for Fe
III
(d
5
)
may be the case for a octahedral deformed ligand field (C
4v
), where the z-component is
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