For a central metal ion in an octahedral complex, what is the value of the pairing energy threshold? — Coordination Compounds Chemistry Question

💡 Solution & Explanation

If $\Delta_o < P$ (weak field), electrons prefer to jump to $e_g$ before pairing. For $d^6$, it fills $t_{2g}^3 e_g^2$, then the 6th electron pairs in $t_{2g}$, resulting in $t_{2g}^4 e_g^2$ [49, 50].