Question
Give the classification of substitution mechanisms for octahedral complexes.
Answer :
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Substitution reactions in octahedral complexes are classified on the basis of the pathway by which a ligand is replaced and the change in coordination number during the reaction. Broadly, these mechanisms are grouped into dissociative, associative, and interchange pathways. In the dissociative mechanism, the rate-determining step involves the loss of a ligand from the coordination sphere, resulting in a five-coordinate intermediate or activated complex. This mechanism is denoted as D when a stable intermediate is formed and as Id when bond breaking predominates without a well-defined intermediate.
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