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Question
Discuss the nature of bonding in the following coordination entity on the basis of valence bond theory:
[FeF6]3−
Solution
In this complex, the oxidation state of Fe is +3.
Orbitals of Fe+3 ion:
There are 6 F− ions. Thus, it will undergo d2sp3 or sp3d2 hybridization. As F− is a weak field ligand, it does not cause the pairing of the electrons in the 3d orbital. Hence, the most feasible hybridization is sp3d2.
sp3d2 hybridized orbitals of Fe are:
Hence, the geometry of the complex is found to be octahedral.
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