Discuss the nature of bonding and magnetic behaviour in the `[FeF_(6)]^(3-)` Co-ordination entities on the basis of valence bond theory.

Explanation

`[FeF_(6)]^(3-)`: In this complex, the oxidation state of Fe is + 3.

F- is not a strong field ligand. It is a weak field ligand, so no pairing occurs Thus, 3d-orbitals are not available to take part in bonding.

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