Reactions
Given that a virtually uncountable variety of octahedral complexes exist, it is not surprising that a wide variety of reactions have been described. These reactions can be classified as follows:
- Ligand substitution reactions (via a variety of mechanisms)
- Ligand addition reactions, including among many, protonation
- Redox reactions (where electrons are gained or lost)
- Rearrangements where the relative stereochemistry of the ligand change within the coordination sphere.
Many reactions of octahedral transition metal complexes occur in water. When an anionic ligand replaces a coordinated water molecule the reaction is called an anation. The reverse reaction, water replacing an anionic ligand, is called an "aquation reaction." For example, the 2+ slowly aquates to give 3+ in water, especially in the presence of acid or base. Addition of concentrated HCl converts the aquo complex back to the chloride, via an anation process.
Read more about this topic: Octahedral Molecular Geometry
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