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When degenerate d-orbitals of an isolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost. The two set \( t_{2 g}\left(d_{x y}, d_{y z}, d_{x z}\right) \) and eg \( \left(d_{z^{2}}, d_{x^{2}-y^{2}}\right) \) are either stabilized or destrabilized depending upon the nature of magnetic field. It can be expressed diagrammatically as:
Tetrahechral field
Octahechral field
- Value of CFSE depends upon nature of ligand and a spectrochemical series has been made experimentally, for tetrahedral complexes, \( \Delta \) is about \( 4 / 9 \) times to \( \Delta_{0} \) (CFSE for octahedral complex). This energy lies in visible region and i.e., why electronic transition are responsible for colour. Such transitions are not possible with \( \mathrm{d}^{0} \) and \( \mathrm{d}^{10} \) configuration.
Crystal field stabilization energy for \( \left[\mathrm{CoF}_{6}\right]^{3-} \) in terms of parameter \( \mathrm{Dq} \) is \( -(\Delta=10 \mathrm{Oq}) \)
- (A) 4
(B) 6
(C) 12
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