5.8 Discussion of the Case
5.8.1 Electron Spin Resonance (ESR) Spectra
The ESR spectra were performed on the pristine compound and on its adduct with
base molecules (4-methyl pyridine, 4Mepy) (Fig. 5.7).
The g values are:
g xx ¼ g yy g zz
b 1 ¼ b 2 b 3
½CoPc
2:94
1:89
À0:1531 0:9763
½CoPcð4MepyÞ
2:32
2:005 À0:0475 0:9977
CoPcð4MepyÞ 2
Â
Ã
2:25
2:015 À0:0368 0:9986
b 1 b 2 b 3 are, respectively, the weight of d xz d yz d
2
z orbitals in the ground state
configuration and are calculated from
50 G
H / G
2 145
4 645
g
g
g
Fig. 5.7 ESR spectrum of [CoPc(4-methyl pyridine)]. g ‖ = g zz g † = g xx,yy g′ is due to impurity.
In the g ‖ region it is well evident the hyperfine interaction with nitrogen nucleus of 4-methyl
pyridine [9, 10]
94
5 The Symmetry Properties Describe the Electronic Structure …
5.8.1 Electron Spin Resonance (ESR) Spectra
The ESR spectra were performed on the pristine compound and on its adduct with
base molecules (4-methyl pyridine, 4Mepy) (Fig. 5.7).
The g values are:
g xx ¼ g yy g zz
b 1 ¼ b 2 b 3
½CoPc
2:94
1:89
À0:1531 0:9763
½CoPcð4MepyÞ
2:32
2:005 À0:0475 0:9977
CoPcð4MepyÞ 2
Â
Ã
2:25
2:015 À0:0368 0:9986
b 1 b 2 b 3 are, respectively, the weight of d xz d yz d
2
z orbitals in the ground state
configuration and are calculated from
50 G
H / G
2 145
4 645
g
g
g
Fig. 5.7 ESR spectrum of [CoPc(4-methyl pyridine)]. g ‖ = g zz g † = g xx,yy g′ is due to impurity.
In the g ‖ region it is well evident the hyperfine interaction with nitrogen nucleus of 4-methyl
pyridine [9, 10]
94
5 The Symmetry Properties Describe the Electronic Structure …