For the same metal ion and ligands, the tetrahedral crystal field splitting Delta_t is related to the octahedral splitting Delta_o approximately by

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For the same metal ion and ligands, the tetrahedral crystal field splitting $Δ_{t}$ is related to the octahedral splitting $Δ_{o}$ approximately by

With only four ligands and no ligand pointing directly at any d orbital, the tetrahedral splitting is much smaller,

Δ_{t} \approx \frac{4}{9} Δ_{o} \approx 0.44 Δ_{o}