The crystal field stabilization energy (CFSE) of and , respectively, are:

Question

The crystal field stabilization energy (CFSE) of  and , respectively, are:

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Strategy:
 Calculate the CFSE for an octahedral high-spin  complex and a tetrahedral  complex.

Step 1: CFSE for 
 is . With weak field , it forms a high-spin octahedral complex.
Configuration: .
.

Step 2: CFSE for 
 is . With weak field  and a coordination number of 4, it forms a tetrahedral complex.
In a tetrahedral field, levels are inverted (e below t2).
Configuration: .
.

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