Jahn-Teller effect is NOT observed in high-spin complexes of:

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Question

Jahn-Teller effect is NOT observed in high-spin complexes of:

Accepted Answer

Correct Answer: D — d8Step-by-step Solution:The Jahn-Teller theorem states that any non-linear molecule in a degenerate electronic state will spontaneously distort to remove the degeneracy. In octahedral complexes, this distortion occurs when the eg level is asymmetrically occupied.High-spin d8 configuration in octahedral field: t2g6 eg2.The eg level has one electron in each orbital (dz²1, dx²-y²1) — this is a symmetric arrangement. No degeneracy, so no Jahn-Teller distortion.Why other options show Jahn-Teller effect:Option A: High-spin d4: t2g3 eg1 — one electron in eg, asymmetric. Jahn-Teller active.Option B: d9: t2g6 eg3 — three electrons in eg (effectively a hole in one orbital), asymmetric. Strong Jahn-Teller distortion (e.g., Cu2+ complexes).Option C: High-spin d7: t2g5 eg2 — two electrons in eg arranged symmetrically, but t2g5 is asymmetric. Weak Jahn-Teller distortion occurs.Key Concept: Jahn-Teller distortion is significant (strong) when eg level is asymmetrically occupied: d4 (HS), d9. It is weak when t2g is asymmetric but eg is symmetric. It is absent when both t2g and eg are symmetrically filled, as in high-spin d8.

Jahn-Teller effect is NOT observed in high-spin complexes of:

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