In Crystal Field Theory, the central metal ion is treated as positive while the ligands as negative point charges. Graphically though, taking the simple example of TiCl63-, it is more usual to represent this as shown below where the central metal is seen as a grey sphere and the chlorides are green spheres. The orientation of each of the five d orbitals in an octahedral field can be superimposed and related to the faces of a cube.
The electron density (i.e., the lobes of the orbitals) lies directly in line with the point charges on the axes.
dxy dxz dyz
The electron density lies in between the point charges.
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