The conditions and consequence that favours the \(t_2{ }^3{ }^3 \mathrm{e}_{\mathrm{g}}{ }^1\) configuration…

The conditions and consequence that favours the \(t_2{ }^3{ }^3 \mathrm{e}_{\mathrm{g}}{ }^1\) configuration in a metal complex are :
  1. weak field ligand, low spin complex
  2. weak field ligand, high spin complex
  3. strong field ligand, high spin complex
  4. strong field ligand, low spin complex

Solution

The conditions and consequence that favour $t_{2 g}^3 e_g^1$ 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.

Asked in: JEE Main 2025 (24 Jan Shift 2)

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