D orbitals in tetrahedral complexes

Thus far we have considered the crystal-field model only for complexes having an octahedral geometry. When fliere are only four ligands about the metal, the geometry is generally tetrahedral, except for the special case of metal ions with a d electron configuration, which we will discuss in a moment The crystal-field splitting of the metal d orbitals in tetrahedral complexes differs from that in octa-... 

Since the splitting of the d orbitals in tetrahedral complexes is much smaller than in the octahedral ones, the former appear, by and large, with high-spin configurations. Examples of tetrahedral complexes with low-spin configurations can be found only for metal ions with high oxidation states. 

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