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The Crystal Field Stabilisation Energy (CFSE) for [CoCl6]4- is 18000 cm-1. The CFSE for [CoCl4]2- will be

1. 8000 cm-1
2. 6000 cm-1
3. 16000 cm-1
4. 18000 cm-1

Correct answer: 6000 cm-1

Solution

In [CoCl6]4-, the coordination number is 6 (octahedral geometry), while in [CoCl4]2-, the coordination number is 4 (tetrahedral geometry). The CFSE in tetrahedral complexes is approximately 4/9 of that in octahedral complexes. Thus, CFSE for [CoCl4]2- = (4/9) × 18000 cm-1 = 8000 cm-1.

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