Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory.
`[FeF_(6)]^(3-)`

Explanation

`[FeF_(6)]^(3-)` In this complex, the oxidation state of Fe is +3. `Fe^(3+)=3d^(5)4s^(0)`

`F^(-)` is a weak field ligand, so on pairing occurs. Thus, 3d-orbitals are not available to take part in bonding.
`[FeF_(6)]^(3-)=`

Because of the presence of five unpaired electrons, the complex is paramagnetic.
Moreover, nd-orbitals are involved in bonding, so it is an occur orbital or high spin complex.