Chemistry - Coordination Chemistry Question with Solution | TestHub

The conditions and consequence that favour $t_{2g}^3{e}_g^1$ configuration in a metal complex are
(i) weak field ligand, and
(ii) high spin complex

For weak field ligands, splitting energy ( ${\Delta }_0$ ) is lower than pairing energy $(P)$. As a result distribution of electrons for $3{\mathrm{d}}^4$ will be $t_{2\mathrm{g}}^3{\mathrm{e}}_{\mathrm{g}}^1$. It results in high spin complex due to maximum number of unpaired electrons.