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Q5.18:
What is crystal field splitting energy? How does the magnitude of \(\Delta_{o}\) decide the actual configuration of d orbitals in a coordination entity?

Solution :

Definition: Crystal Field Splitting Energy ($\Delta_{o}$)

Crystal Field Splitting Energy, denoted as $\Delta_{o}$ for octahedral complexes, is the difference in energy between the two sets of $d$-orbitals ($t_{2g}$ and $e_{g}$) created when the five degenerate $d$-orbitals of a central metal ion are split by the electrostatic field of surrounding ligands. [Per Crystal Field Theory (CFT)].

As ligands approach the central metal ion, electrons in the $d$-orbitals experience repulsion. The orbitals pointing directly toward the ligands ($d_{x^{2}-y^{2}}$, $d_{z^{2}}$) experience greater repulsion and are elevated to a higher energy level ($e_{g}$), while those pointing between the ligands ($d_{xy}$, $d_{yz}$, $d_{zx}$) are at a lower energy level ($t_{2g}$).

Energy Levels of d-orbitals Degenerate d-orbitals eg t2g Δo

Mechanism of Orbital Configuration

The configuration of electrons in $d$-orbitals depends on the competition between the magnitude of the splitting energy ($\Delta_{o}$) and the Pairing Energy ($P$), which is the energy required to force two electrons into the same orbital.

Condition Ligand Type Configuration Effect
$\Delta_{o} < P$ Weak Field High Spin Complex (Electrons prefer occupying $e_{g}$ over pairing)
$\Delta_{o} > P$ Strong Field Low Spin Complex (Electrons prefer pairing in $t_{2g}$ before occupying $e_{g}$)

Step-by-Step Configuration Analysis

Step 1: Assessing the Field Strength
The nature of the ligand dictates the magnitude of $\Delta_{o}$. Spectrochemical series orders ligands: $I^{-} < Br^{-} < S^{2-} < SCN^{-} < Cl^{-} < N_{3} < F^{-} < OH^{-} < C_{2}O_{4}^{2-} < H_{2}O < NCS^{-} < NH_{3} < en < CN^{-} < CO$. [Per Spectrochemical Series].

Step 2: Applying Hund's Rule vs. Crystal Field Splitting
For $d^{4}$ to $d^{7}$ systems:

  • Case A (Weak Field, $\Delta_{o} < P$): Electrons occupy orbitals according to the Aufbau principle, filling $e_{g}$ orbitals before pairing occurs in $t_{2g}$. This results in the maximum number of unpaired electrons.
  • Case B (Strong Field, $\Delta_{o} > P$): The energy gap is too large to promote electrons to the higher $e_{g}$ level. Electrons are forced to pair in the lower energy $t_{2g}$ orbitals, minimizing the total energy.

Final Solution: The configuration of d-orbitals is determined by the ratio $\Delta_{o}/P$. If $\Delta_{o} < P$, the complex is high-spin; if $\Delta_{o} > P$, the complex is low-spin. This decision dictates the magnetic properties and stability of the coordination entity.


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