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 1

Answer

Question 15

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: