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Question:

Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory:

(i) [Fe(CN)6]4-

(ii) [FeF6]3-

(iii) [Co(C2O4)3]3-

(iv) [CoF6]3-

Answer:

(i) [Fe(CN)6]4-

In the above coordination complex, iron exists in the +II oxidation state.

Fe2+ : Electronic configuration is 3d6

Orbitals of Fe2+ ion:

Hence, the geometry of the complex is octahedral and the complex is diamagnetic (as there are no unpaired electrons).

 

(ii) [FeF6]3-

In this complex, the oxidation state of Fe is +3.

Orbitals of Fe+3 ion:

Hence, the geometry of the complex is found to be octahedral.

 

(iii) [Co(C2O4)3]3-

Cobalt exists in the +3 oxidation state in the given complex.

Orbitals of Co3+ ion:

Hence, the geometry of the complex is found to be octahedral.

 

(iv) [CoF6]3- Cobalt exists in the +3 oxidation state.

Orbitals of Co3+ ion:

Again, fluoride ion is a weak field ligand. It cannot cause the pairing of the 3d electrons. As a result, the Co3+ ion will undergo sp3d2 hybridization. sp3d2 hybridized orbitals of Co3+ ion are:


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