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Question

Jahn-Teller effect is not observed in high spin complexes of


A

d4

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B

d9

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C

d10

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D

d7

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Solution

The correct option is C

d10


The explanation for the correct option:

Option (C): d10

  1. The geometrical distortion of molecules and ions that is associated with particular electron configuration is described by the Jahn-Teller effect, also known as John-Teller distortion.
  2. The Jahn-Teller distortion is very weak in the case of unevenly occupied t2g orbitals because the t2gset does not point directly at the ligands and so the energy gain is significantly lower.
  3. Jahn-Teller distortion is frequently considerable for asymmetrically occupied eg orbitals because they are directed towards the ligands and the energy gain is significantly greater.
  4. High spin complexes like d3,d5,d8and d10 do not exhibit the Jahn-Taller effect.

  1. Jahn-Teller effects are stronger in degenerate electronic states occupying the eg orbital set. The occupation of these high-energy orbitals is the primary reason for this. The degeneracy of the eg set is broken, the symmetry is decreased, and occupations at lower energy orbitals occur as the system becomes more stable with a lower energy configuration.
  2. Hence, it is the correct option.

Therefore, the Jahn-Teller effect is not observed in high spin complexes of d10


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