Effects of Ion Pairing
Polycationic complexes tend to form ion pairs with anions and these ion pairs often undergo reactions via the Ia pathway. The electrostatically held nucleophile can exchange positions with a ligand in the first coordination sphere, resulting in net substitution. An illustrative process comes from the "anation" (reaction with an anion) of chromium(III) hexaaquo complex:
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- 3+ + SCN- {, NCS}2+
- {, NCS}2+ 2+ + H2O
Read more about this topic: Associative Substitution
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