The complex ion that will lose its crystal field stabilization energy upon oxidation of metal to +3 state is:
(phen = 1,10-phenanthroline, a strong field bidentate ligand; ignore pairing energy)

Question

Canvas Classes · Accepted Answer

Strategy:
 Calculate the CFSE for both the  and  oxidation states of the central metals, looking for the pairing that ends with a CFSE of zero structurally.

Step 1: Evaluate CFSE zero states
CFSE drops to exactly zero for isolated high-spin  () or  configurations.

Step 2: Evaluate the provided key option: 
- Oxidation state +2:  (). Phenanthroline is a very strong field ligand. It holds a robust low-spin state . CFSE = .
- Oxidation state +3:  (). With phenanthroline, it forms a low-spin  comp

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