Question

Among the octahedral and tetrahedral crystal fields, in which case the magnitude of crystal field splitting is larger ?

Answer 1

tetrahedral in this case .

Answer 2

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In tetrahedral complexes four ligands form a tetrahedron around the metal ion. In a tetrahedral crystal field splitting the d-orbitals again split into two groups, with an energy difference of Δtet where the lower energy orbitals will be dz2 and dx2-y2, and the higher energy orbitals will be dxy, dxz and dyz - opposite to the octahedral case. Furthermore, since the ligand electrons in tetrahedral symmetry are not oriented directly towards the d-orbitals, the energy splitting will be lower than in the octahedral case.
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