Question

The values of the crystal field stabilization energies for a high spin d $^{6}$ metal ion in octahedral and tetrahedral fields, respectively, are:

• A. $-0.4 \Delta_{0}$ and $-0.27 \Delta_{ t }$
• B. $-1.6 \Delta_{0}$ and $-0.4 \Delta_{t}$
• C. $-0.4 \Delta_{0}$ and $-0.6 \Delta_{ t }$
• D. $-2.4 \Delta_{0}$ and $-0.6 \Delta_{ t }$

Answer 1

Answer: (C)

For high spin octahedral field



$CFSE =(4)\left(-0.4 \Delta_{0}\right)+2\left(0.6 \Delta_{0}\right)=-0.4\, \Delta_{0}$

For high spin tetrahedral field



$CFSE =3\left(-0.6 \Delta_{ t }\right)+3\left(0.4 \Delta_{ t }\right)=-0.6 \Delta_{ t }$