Chemistry Reference
In-Depth Information
Fig. 2.9 Quadrupole splitting in the HS [Fe(H
2
O)
6
]
2+
complex ion arises from a non-cubic
valence electron distribution due to Jahn-Teller distortion with lowering of symmetry from O
h
(EFG = 0) to D
4h
with valence electron population in a compressed octahedron as shown in the
figure and described in the text
Fig. 2.10 K
4
[Fe(CN)
6
]isa3d
6
LS complex with O
h
symmetry, where all six electrons are
accommodated in the three t
2g
orbitals. Both contributions (EFG)
val
and (EFG)
lat
vanish; there is
no quadrupolar interaction. Na
2
[Fe(CN)
5
NO]
2H
2
O has C
4v
symmetry with d-orbital splitting as
shown on the right. Its LS behavior requires that all six electrons are accommodated in the lowest
three orbitals arising from the tetragonal splitting of the former cubic t
2g
(O
h
) subgroup. (EFG)
val
is still zero, but (EFG)
lat
= 0 arises from the ligand replacement in he iron coordination sphere
