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In which of the following coordination entities the magnitude Δ₀ (CFSE in octahedral field) will be maximum?

1. [Co(H₂O)₆]³⁺
2. [Co(NH₃)₆]³⁺
3. [Co(CN)₆]³⁻
4. [Co(C₂O₄)₃]³⁻

Correct answer: [Co(CN)₆]³⁻

Solution

[Co(CN)₆]³⁻ has a d⁶ configuration, which will experience the maximum crystal field splitting energy (Δ₀) due to the strong field ligand CN⁻.

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