Question
Give the elementary steps and rate expression for the inner sphere mechanism which involves formation of a precursor complex.
Answer :
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In the inner sphere mechanism of ligand substitution in coordination chemistry, the reaction proceeds through a series of elementary steps involving the formation of a precursor complex. This mechanism is generally observed in substitution reactions of octahedral and square planar metal complexes, especially when a bridging ligand can connect the incoming and leaving groups. The first elementary step is the rapid formation of a precursor complex, where the incoming nucleophile (Nu) approaches the metal center and forms a weak association with the coordinated ligand, often through a bridging ligand (X). This can be represented as: [ [ML_n] + Nu \rightleftharpoons [ML_n \cdot Nu] ] Here, ([ML_n]) is the
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