First slide

Crystal field theory

Question

Stabilization energy of octahedral complex with d⁷configuration
A) 1.8 with one unpaired electron
B) 1.8 with three unpaired electrons
C) 0.8 with one unpaired electron
D) 0.8 with three unpaired electrons

Moderate

A

A and D
B

A and B
C

C and D
D

B and C

Solution

Case-I: weak field ligand, $∆_{o} < P$
$d^{7}, t_{2 g}^{5} e_{g}^{2}$ (three unpaired electrons)
CFSE = $5 (- 0 .4 Δ_{o}) + 2 (+ 0 .6 Δ_{o})$
CFSE = $- 0 .8 Δ_{o}$
Case-II: strong field ligand, $∆_{o} < P$
$d^{7}, t_{2 g}^{6} e_{g}^{2}$ (one unpaired electrons)
CFSE = $6 (- 0 .4 Δ_{o}) + 2 (+ 0 .6 Δ_{o})$
CFSE = $- 1 .8 Δ_{o}$

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