high spin and low spin

Question

Low spin complexes are formed with:

RankGuru · Accepted Answer

**Crystal Field Splitting Energy ($\Delta_o$)** vs **Pairing Energy ($P$)**:
- **Strong Field Ligands**: Cause a large $\Delta_o$. If $\Delta_o > P$, electrons prefer to pair up in the lower $t_{2g}$ orbitals rather than jump to high-energy $e_g$ orbitals. This results in the minimum possible number of unpaired electrons (**Low Spin Complex**).
- **Weak Field Ligands**: Cause small splitting. If $\Delta_o < P$, electrons occupy $e_g$ before pairing. This leads to the maximum number of unpaired electrons (**High Spin Complex**).

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high spin and low spin

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