# Ionic radius for tetrahedral metal–ligand complexes

The ionic radii for metal–ligand complexes that are in an octahedral coordination are easy to find. I understand that when the $$\mathrm{e_g}$$ orbital is filled, the ionic radius increases because the electrons repel the ligands meaning the ionic radius increases.

But I am not sure about tetrahedrally coordinated metal–ligand complexes. I think it might be the same for the first two to three electrons, but since the $$\mathrm{t_{2g}}$$ orbital electrons are degenerate, the $$Z_\mathrm{eff}$$ might be stronger “felt” by the ligands.