How many unpaired electrons does a high spin Fe(III) complex have?
Question
How many unpaired electrons does a high spin Fe(III) complex have?
Solution
A high spin Fe(III) complex has 5 unpaired electrons. The Fe(III) ion has 5 d electrons, and in a high spin complex, the ligand field splitting is small enough that it's energetically favorable for electrons to occupy all five d orbitals singly before any pairing occurs. Therefore, all 5 d electrons are unpaired.
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