Question

Explain the mechanisms of substitution reaction in octahedral complexes.

Answer 1

Answer:

Mechanisms of Substitution Reaction in octahedral complexes:

• The substitution reactions that take vicinity in any octahedral complexes normally follows dissociative mechanism. In dissociative mechanism, one of the ligand with inside the octahedral complicated is dissociated to shape the complicated and some other ligand from the response medium substitutes it.
• The motive of following dissociative mechanism normally is due to the discharge of steric hinderance via way of means of the elimination of one of the ligands throughout the response mechanism.  
• As the steric hinderance is much less for the incoming ligand, the capacity electricity of the octahedral complicated and intermediates fashioned stays low.
• This dissociative substitution is just like the substitution unimolecular nucleophilic response mechanism that's normally known as $SN_{1}$ mechanism. It is basically located withinside the coordination complexes in which the carbon monoxide $(CO)$ group is withinside the cis function to the alternative carbon monoxide ligand.

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Answer 2

Answer:

The formation of pi-bonds is the mechanism of substitution reaction in octahedral complexes.

Explanation:

In the substitution, the SN-1 mechanism is characteristic for complexes of metals with d1 or d2 electronic configurations. The formation of π bonds mainly helps in the substitution reactions in octahedral complexes.

In the substitution reactions, one of the ligands inside the octahedral complicated is dissociated to shape the complicated and some other ligand from the response medium substitutes it.

As the steric hindrance is much less for the incoming ligand, the capacity electricity of the octahedral is complicated and intermediates fashioned stay low.

Hence, the mechanisms of substitution reaction in octahedral complexes are mainly by the formation of pi-bonds.

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