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Type 8 Lewis Acid/Base Complexation Chemistry
Type 8 complexes form when a s-LUMO Lewis acid interacts with a pi-System Lewis base.

Quite a number of Type 8 Lewis acid/base complexes are known, for example sodium cyclopentdienyl. However, as s-LUMO species are hard Lewis acids and delocalised pi-System Lewis bases are soft, it follows that the resulting species are mixed hard/soft complexes.

For more information look in the Chemogenesis webbook sections on Lewis acids and Lewis bases and the Lewis acid/base interaction matrix.