Associative substitution

The self - Wilkins mechanism describes in coordination chemistry the process of ligand exchange at metal complexes in aqueous solution from a mechanistic point of view. It was proposed by Manfred Eigen and Ralph G. Wilkins and named after them.

Example

A Chrom3 ion binds example, six water molecules to a Hexaaquakomplex. Is added to an aqueous solution of this Hexaaquakomplexes ammonia added (NH3 ), some or all of the water molecules are replaced in the complex in an equilibrium reaction by ammonia molecules, the total number of ligands, ie 6, remains unchanged. If this exchange quickly, referred to the complex as a labile, it is slow, as inert.

Ligand exchange can be understood according to the following mechanistic scheme:

Chromium Chemical equilibrium Metastability Equilibrium constant Law of mass action Le Chatelier's principle Chemical kinetics Reaction rate constant
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