This is confusing!

[ChemSiddiqui]

hi all,

 

I was just wondering if the d6 ions can have spin-only magnetic moment in a tetrahedral field which gives the value 2.83 BM? I cant see that happeing becuase in tetrahedral field the spin is HIGH, and we have 4 unpaired electron to give 4.90. We dont observe the low spin in which case the spin-only magnetic moment will indeed be 2.83.

 

I am confused, I have got a question which asks why d6 ions in tetrahedral field have the magnetic moment 4.90 BM or 2.83 BM while 4.90 BM or 0 BM in an octahedral field. But it does ask which one of the 4 values are not observed in practice!