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CH1012
4-COORDINATE COMPLEXES II
This tendency towards a tetrahedral
geometry is sometimes over-ridden by
the
directional properties
associated
with the orientation
of the d-orbitals
and a
square planar geometry is observed for the
d
8
-metal ions
eg Pt(0) 6s
1
5d
9
Pt(II) 5d
8
.
Zn(NH
3
)
4
2+
4s
o
3d
10
Pt(NH
3
)
2
Cl
2
6s
o
5d
8