1. d⁸ 2. d⁴ 3. d⁹ 4. d⁷

Answer: 1. d⁸ Key idea: Jahn-Teller distortion occurs when the e_g or t_2g set is unevenly filled (degenerate ground state). High spin d⁸ : t_2g⁶e_g² , symmetrical, no distortion. High spin d⁴ : t_2g³e_g¹ , strong distortion. d⁹ : t_2g⁶e_g³ , strong distortion. High spin d⁷ : t_2g⁵e_g² , uneven t_2g , weak distortion. So d⁸ does not show it.

Topic: Crystal field theory, colour and magnetic properties· Coordination Compounds

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

1. \(d^8\)

2. \(d^4\)

3. \(d^9\)

4. \(d^7\)

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Answer: 1. \(d^8\)

Key idea: Jahn-Teller distortion occurs when the \(e_g\) or \(t_{2g}\) set is unevenly filled (degenerate ground state).

High spin \(d^8\): \(t_{2g}^6e_g^2\), symmetrical, no distortion.
High spin \(d^4\): \(t_{2g}^3e_g^1\), strong distortion.
\(d^9\): \(t_{2g}^6e_g^3\), strong distortion.
High spin \(d^7\): \(t_{2g}^5e_g^2\), uneven \(t_{2g}\), weak distortion.

So \(d^8\) does not show it.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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

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