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



$CFSE=3\left(-0.6{\Delta }_t\right)+3\left(0.4{\Delta }_t\right)=-0.6{\Delta }_t$